Do I have to pick up my bags on a connecting flight?

On a single ticket domestic US itinerary, usually no. Checked bags are typically tagged to your final city. On separate tickets, usually yes. After most international arrivals into the US, yes: claim for CBP, then re-check, unless your airline publishes preclearance or you are on an eligible CBP remote-screening route. Always confirm the city code on your bag tag.

Which airline’s bag size and fees apply on a codeshare?

For checked allowances and fees on itineraries with a US origin or destination, DOT 14 CFR §399.87 requires carriers to apply the rules from the start of the itinerary, and on code-share segments the marketing carrier’s allowances and fees when they differ from the operating carrier. Airlines still advise checking the operating carrier for baggage details, and cabin sizers and valet checks follow the plane you board. Example exception: Frontier’s Volaris codeshare terms and conditions apply the marketing carrier’s bag policy for the whole itinerary and check bags through to the final destination. Confirm your confirmation email and both airlines.

What if I booked two separate tickets on purpose?

Expect to collect bags at the end of the first ticket, check in again, pay the second airline’s bag fees if required, and re-clear TSA. Some airlines publish narrow through-check exceptions (Delta lists specific partners and trips flown entirely on Delta). American’s public through-check wording is limited to trips on the same reservation connecting to American or oneworld flights. If it is not published for your pair, confirm with both airlines. Do not rely on minimum connecting time.

How do Southwest bags work on a layover?

If everything is on one Southwest reservation, your checked bags are transferred for you on that itinerary. You generally stay airside and reclaim at the end on domestic trips. If you hold separate tickets, plan to reclaim and re-check unless Southwest confirms otherwise. For international flights into the US with a connection, Southwest’s published process is to claim all checked luggage, clear Customs, and re-check, except arrivals that already cleared US Customs at Southwest preclearance locations (Aruba and Nassau, per Southwest help).

Why do budget airline bag fees hurt more on connecting itineraries?

Many budget airline base fares include only a personal item, and prices often depend on route and timing (use each airline’s calculator; there is no single nationwide table for the 1st and 2nd bag). Allegiant publishes that bag fees are charged per bag, per segment, so a connection can mean paying more than once. Trips that mix a budget airline and a legacy airline usually mean a full reclaim and paying bag fees again unless a published codeshare applies.

What happens if my carry-on is gate-checked on a tight connection?

On one ticket, airlines often tag a gate-checked bag for return at the jet bridge or planeside, or for transfer under that itinerary. American Eagle valet checks and planeside checks on Delta Connection flights with 50 seats or fewer are typically free when published. United Basic Economy travelers who must check a full carry-on still pay on most domestic routes (about $45 prepaid, $50 at the airport counter or $75 at the gate for tickets bought on or after April 3, 2026). On separate tickets, a gate-check can send the bag to claim and force a re-check. Leave more time, or keep a true under-seat personal item only.

Connecting Flights Bag Rules (2026): Checked Through or Re-Checked

Learn when checked bags go through or must be reclaimed, whose size and fee rules apply on codeshares, and how US customs and tight connections affect bags.

Quick answer

Start with the operating carrier and whether your bags are checked through. On a single ticket, US majors usually tag checked bags to the final city for domestic connections. You stay airside and reclaim at the end. On separate tickets, expect to claim and re-check (and often re-clear TSA) unless a published through-check exception applies. Codeshares: DOT rules keep the marketing carrier’s checked bag fees and allowances for the whole trip on many tickets that start or end in the US; airlines still tell you to confirm the operating carrier’s baggage details and cabin sizers. International to US: plan to claim bags for CBP, then re-check, unless your route uses preclearance or a published CBP remote-screening exception. Read the bag tag city before you leave the counter.

Last verified: Sep 16, 2026

Official sources:

How we check: We only publish what these official pages say. See How we verify fees.

The connection and through-check process facts here come from the official sources linked below. Dollar amounts and bag sizes for a specific airline still follow that airline’s BagRule baggage fees and size page (and its Last verified date). Check those pages if you need exact prices or sizes.

Decision boxes

Box A: Single ticket or separate tickets

Swipe for more

Situation	Typical bag path	Traveler action
One reservation with one booking reference (same airline or published partners on one ticket)	Checked bags are usually tagged through to the final destination on that ticket (domestic).	Confirm the destination code on the bag tag at check-in. Stay airside for domestic connections unless the airport forces an exit.
Separate tickets or booking references (self-transfer, a budget airline mixed in, a “positioning” flight)	Bags usually checked only to the end of the first ticket.	Build extra time to claim bags, walk to the next airline’s counter, pay that ticket’s bag fees if due, and re-clear TSA. The minimum connecting time on the first ticket does not protect you.
Published through-check exceptions (examples below)	Some airlines will through-check across two tickets only with named partners or when every flight is on the same airline.	Confirm with both airlines at booking and at the airport; never assume.

Examples from airline pages (process, not fees):

American: Publishes that it only through-checks when all tickets are in the same reservation and you are connecting to another American or oneworld flight. Free checked-bag marketing often excludes partner-operated codeshares. Confirm operating carrier. (aa.com checked bag policy and codeshare tips.)
Delta: Through-checks from origin to destination on a single ticket or conjunction tickets (including other airlines on that ticket). With a second ticket, bags are checked only to the Delta ticket’s destination and you re-check them, except in listed cases (a journey entirely marketed or operated by Delta; Delta plus flights operated by Aeromexico, Air France, China Eastern, KLM, Korean Air, LATAM, Virgin Atlantic or WestJet; Delta charters; active-duty military on orders). (delta.com through-check and partner pages.)
United, Alaska, JetBlue and Hawaiian: On separate tickets, confirm through-checking with both airlines unless you find a current published exception for your two airlines. On codeshares, check your confirmation for whose bag policy applies.
Southwest: On one Southwest booking, connecting bags are handled as a normal Southwest itinerary (you do not reclaim mid-trip on domestic). On separate tickets, do not assume through-check. Confirm with Southwest; plan to claim and re-check. (For reclaiming bags when you arrive in the US from abroad, see Box C.)
Budget airlines (Frontier, Allegiant, Sun Country, Avelo, Breeze): Plan to re-check on connections that mix airlines or use separate tickets unless a published codeshare says otherwise (Frontier and Volaris, below). Allegiant: bag fees are per bag, per segment. A connection can mean paying more than once.

Box B: On a codeshare, whose size and fee rules apply?

Fees and allowances follow different rules than cabin size checks, so treat them separately.

Swipe for more

Layer	What usually applies (US travelers)	Source
Checked bag fees and piece allowances on a single ticket that starts or ends in the US	DOT 14 CFR §399.87: apply the allowances and fees from the beginning of the itinerary throughout; on code-share segments, apply the marketing carrier’s allowances and fees when they differ from the operating carrier.	The DOT’s official rule; it does not mean the operating carrier’s rules always apply.
Airline help page guidance	American (and peers) still say: check in with the airline operating your first flight; baggage policies differ, check the operating airline for baggage information. Free American status and card bags often American marketed and operated only.	aa.com codeshare tips and American’s free-bag footnotes.
Published codeshare override (example)	Frontier × Volaris: for codeshare flights, the baggage policy of the airline you booked with (marketing) applies for the entire itinerary; bags are checked through to final destination (per Frontier’s codeshare terms and conditions). The operating airline still runs boarding and operations.	flyfrontier.com codeshare terms and conditions.
Cabin size, sizers and gate valet	The operating carrier’s aircraft and gate process control what fits overhead and whether you get a free valet or planeside check (for example, American Eagle valet, Delta Connection flights with 50 seats or fewer).	BagRule airline size pages; not a DOT fee rule.

For checked fees on one US ticket, start with the marketing carrier and first-segment rules under DOT §399.87, then confirm anything the operating airline publishes for cabin size, free-bag waivers, and partner exclusions.

Box C: Domestic connection or reclaim on international flights to the US

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Arrival type	Bags	Security and inspection
Domestic to domestic (one ticket, sterile connection)	Usually no reclaim; bags transfer to the final city.	Usually no new TSA screening if you stay airside. Some airports or terminals still make you exit and screen again (check the airport map).
International to US (standard CBP flow)	After immigration, claim checked bags, clear customs and agriculture, then re-check at the airline bag-drop and transfer belt before the next flight. Tag may already show the final city, you still reclaim unless an exception applies.	After re-check, clear TSA again for the domestic (or onward) departure.
US preclearance (example: Southwest lists Aruba and Nassau as its preclearance points)	Treated like a domestic arrival into the US under that airline’s published process. No US Customs reclaim or re-check at the first US airport in that Southwest case.	Still follow the airline’s international check-in cutoffs.
CBP International Remote Baggage Screening (IRBS, or remote screening)	On eligible routes only, connecting passengers may skip reclaim and re-check unless CBP refers the bag for inspection. Not universal.	CBP: IRBS does not change TSA checked-bag screening requirements. United public example: Sydney to San Francisco connections (United news release). Treat as route-specific; confirm eligibility on your booking.

Typical patterns table

These are common patterns only. A fee appears only where the airline publishes it; otherwise, check the airline’s fees page or calculator for your route and date.

Swipe for more

Pattern	Airlines and examples	Through-check?	Size and fee notes	Notes
Legacy single-ticket domestic	American, Delta, United (their own flights and regional partners)	Usually yes to final city	Cabin: the operating aircraft’s rules (American Eagle valet; free planeside checks on Delta Connection flights with 50 seats or fewer; United Express and CommutAir notes on our United pages). Checked bag fees: airline fee pages and our when to pay guide	Read the bag tag. Free status bags may not apply on flights operated by partners.
Legacy airline and alliance partners on one ticket	American with oneworld; Delta with SkyTeam and joint venture partners; United with Star Alliance (confirm your airline pair)	Usually yes when sold as one ticket	DOT rule: the marketing carrier’s fees apply on trips that start or end in the US; check partner pages	Separate tickets: only the Box A exceptions.
Southwest one booking	Southwest	Domestic: bags transfer on the Southwest itinerary	Cabin carry-on and personal item free (Southwest size page). Checked bag fees: mainland tables on our Southwest fees page and when to pay guide (new fees for tickets booked on or after April 9, 2026)	Point-to-point doesn’t mean you always reclaim on one confirmation. On separate tickets, plan to reclaim.
Southwest connection from an international flight to the US	Southwest	Claim all checked bags at the first US airport, clear Customs and re-check (unless you started at a Southwest preclearance airport: Aruba or Nassau)	International counter cutoffs (for example, 60 minutes; 75 minutes in Aruba, per Southwest help)	Southwest international checking article.
Alaska, Hawaiian and JetBlue	Alaska, Hawaiian, JetBlue	Single-ticket connections: treat as normal through-check; confirm partners	Codeshare: check your confirmation for which carrier’s policy applies. Hawaiian and Alaska often share baggage rules	No single interline table is published.
Frontier codeshare (Volaris)	Flights sold by Frontier and operated by Volaris (and the reverse, per the terms and conditions)	Yes to final destination per published codeshare baggage section	Marketing carrier bag policy for entire itinerary	This applies only to the Volaris codeshare, not to other budget airline pairings.
Budget or leisure airline self-transfer	Allegiant, Sun Country, Avelo, Breeze; Frontier outside the codeshare	Expect to re-check; through-checking between airlines is not generally published	Allegiant: fees per bag, per segment (published). Others: price varies by route and date; use each airline’s calculator, with no fixed price for the 1st or 2nd bag	Build long connection; pay each ticket’s bags separately.
United Basic Economy with a connection	United	Bags may through-check on one United ticket, but cabin bag rules stay Basic Economy	Most domestic Basic Economy fares include a personal item only; a full carry-on that must be checked costs up to about $75 across prepaid, counter and gate prices (tickets bought on or after April 3, 2026), not a free planeside courtesy	See the when to pay guide and our United personal item page.
Tight connection and gate-check	American Eagle, Delta Connection, full bins	Gate-checked cabin bags on one ticket are usually tagged to the final city or returned at the jet bridge or planeside, depending on the airline	American and Delta valet or planeside checks are often free when published; United Basic Economy still pays to check a full carry-on	On separate tickets, a gate-check on the first flight can force you to claim, re-check and clear TSA again, a big risk of missing your connection.

At the airport (3 steps)

Read the bag tag and how your ticket is set up. Same confirmation number end-to-end, or two tickets? Does the tag show your final airport code or only the connection city? If the tag stops at the hub, plan to reclaim there.
Match size and fee rules to the right airline. For checked fees on a single US ticket, use the marketing carrier’s rules from the start of the itinerary (DOT §399.87) and the baggage text on your confirmation. For the sizer at the gate, follow the operating airline. Pay for bags where it’s cheapest for that airline (full details on our when to pay guide) before a surprise at the counter or gate.
International flight to the US, or a connection on separate tickets: after landing, go through US Customs and Border Protection (CBP) passport control, collect your bags, clear customs, re-check them with the airline, then go through TSA, unless signs or airline staff send you to a different screening or preclearance route. On tight connections, keep medications and chargers in a true personal item in case your bag is gate-checked (American Eagle valet, Delta Connection planeside or full bins).

Calm tips

Prefer one ticket when you must check bags. Published through-check and misconnect protection are built for that case.
Photograph the bag tag (destination code and tag number) before you leave the counter.
A budget airline with any other airline: assume two bag payments and a full reclaim unless a named codeshare (for example, Frontier and Volaris) says bags check through.
Allegiant connections: remember per segment pricing. A stop can multiply bag fees (check the calculator).
Gate-check on a short layover: ask whether the tag is final destination or this aircraft only. On separate tickets, assume you must reclaim.

FAQ

Do I have to pick up my bags on a connecting flight?: On a single ticket domestic US itinerary, usually no. Checked bags are typically tagged to your final city. On separate tickets, usually yes. After most international arrivals into the US, yes: claim for CBP, then re-check, unless your airline publishes preclearance or you are on an eligible CBP remote-screening route. Always confirm the city code on your bag tag.
Which airline’s bag size and fees apply on a codeshare?: For checked allowances and fees on itineraries with a US origin or destination, DOT 14 CFR §399.87 requires carriers to apply the rules from the start of the itinerary, and on code-share segments the marketing carrier’s allowances and fees when they differ from the operating carrier. Airlines still advise checking the operating carrier for baggage details, and cabin sizers and valet checks follow the plane you board. Example exception: Frontier’s Volaris codeshare terms and conditions apply the marketing carrier’s bag policy for the whole itinerary and check bags through to the final destination. Confirm your confirmation email and both airlines.
What if I booked two separate tickets on purpose?: Expect to collect bags at the end of the first ticket, check in again, pay the second airline’s bag fees if required, and re-clear TSA. Some airlines publish narrow through-check exceptions (Delta lists specific partners and trips flown entirely on Delta). American’s public through-check wording is limited to trips on the same reservation connecting to American or oneworld flights. If it is not published for your pair, confirm with both airlines. Do not rely on minimum connecting time.
How do Southwest bags work on a layover?: If everything is on one Southwest reservation, your checked bags are transferred for you on that itinerary. You generally stay airside and reclaim at the end on domestic trips. If you hold separate tickets, plan to reclaim and re-check unless Southwest confirms otherwise. For international flights into the US with a connection, Southwest’s published process is to claim all checked luggage, clear Customs, and re-check, except arrivals that already cleared US Customs at Southwest preclearance locations (Aruba and Nassau, per Southwest help).
Why do budget airline bag fees hurt more on connecting itineraries?: Many budget airline base fares include only a personal item, and prices often depend on route and timing (use each airline’s calculator; there is no single nationwide table for the 1st and 2nd bag). Allegiant publishes that bag fees are charged per bag, per segment, so a connection can mean paying more than once. Trips that mix a budget airline and a legacy airline usually mean a full reclaim and paying bag fees again unless a published codeshare applies.
What happens if my carry-on is gate-checked on a tight connection?: On one ticket, airlines often tag a gate-checked bag for return at the jet bridge or planeside, or for transfer under that itinerary. American Eagle valet checks and planeside checks on Delta Connection flights with 50 seats or fewer are typically free when published. United Basic Economy travelers who must check a full carry-on still pay on most domestic routes (about $45 prepaid, $50 at the airport counter or $75 at the gate for tickets bought on or after April 3, 2026). On separate tickets, a gate-check can send the bag to claim and force a re-check. Leave more time, or keep a true under-seat personal item only.

Official sources

Swipe for more

Source	URL	Use
American: checked bag and through-check	https://www.aa.com/web/i18n/travel-info/baggage/checked-baggage-policy.html	Through-check only on the same reservation with American or oneworld flights; codeshare limits on free bags
American: codeshare tips	https://www.aa.com/web/i18n/travel-info/partner-airlines/codeshare.html	Check in with operating carrier; baggage policies differ
Delta: through-check (partner airlines page)	https://www.delta.com/us/en/baggage/additional-baggage-information/flight-partners	Single-ticket through-check; multi-ticket exceptions list
Delta: through-check (travel agent version of the same policy)	https://pro.delta.com/content/agency/global/en/products-and-services/baggage/delta-s-through-check-baggage-policy-.html	The same through-check policy, with details and examples
Southwest: checking baggage internationally	https://support.southwest.com/helpcenter/s/article/checking-baggage-internationally	Claim and re-check on arrival in the US; Aruba and Nassau preclearance
Frontier: Volaris codeshare terms and conditions	https://www.flyfrontier.com/travel/travel-info/codeshare-partners/terms-and-conditions/	Marketing bag policy; bags through to final
DOT: 14 CFR §399.87	https://www.law.cornell.edu/cfr/text/14/399.87	Marketing carrier fees on codeshare trips that start or end in the US
CBP: remote baggage screening announcement	https://www.cbp.gov/newsroom/national-media-release/cbp-launches-innovative-international-remote-baggage-screening	Remote screening may skip reclaim; TSA rules unchanged
United: remote baggage screening news release (Sydney to San Francisco example)	United news release on International Remote Baggage Screening	Exception on some routes only; confirm on your booking
TSA: security screening page	https://www.tsa.gov/travel/security-screening	Screen again after leaving the secure area or after reclaiming bags on an international arrival

How we check: We only publish what these official pages and earlier BagRule sources say. See how BagRule verifies.

Disclaimer

Bag rules change. Confirm size, fee, and fare rules on the airline site before you travel. BagRule is a publisher site and does not sell tickets or bags.

Quick answer

Decision boxes

Box A: Single ticket or separate tickets

Box B: On a codeshare, whose size and fee rules apply?

Box C: Domestic connection or reclaim on international flights to the US

Typical patterns table

At the airport (3 steps)

Calm tips

FAQ

Official sources

Related

Disclaimer