Frontier Personal Item Size (2026)

Frontier’s free personal item is 18 × 14 × 8 inches, must fit under the seat, and is included on every fare, including Basic. Anything larger can be treated as a carry-on (paid on Basic and Standard unless you have Economy or higher). Frontier’s personal-item sizer is strict; measure the packed bag before you fly.

This page follows Frontier’s bag options, bag sizes and weight FAQ, and the Contract of Carriage (PDF) for the centimeter figures. Fees for an oversized personal item follow carry-on pricing, which varies by flight; check flyfrontier.com or the booking flow, and see baggage fees.

About the carry-on centimeter figure: our Frontier carry-on size page notes that the 114 cm in the Contract of Carriage is likely wrong for a 24-inch bag. That figure belongs on carry-on size; this page uses the Contract of Carriage figure of 20 × 35 × 45 cm for the personal item, matched in order to 18 × 14 × 8 in.

United publishes a personal-item box around 17 × 10 × 9 (United personal item); Delta emphasizes under-seat fit (Delta personal item). On Frontier Basic, the free 18 × 14 × 8 bag is your one free cabin bag, so do not confuse it with Frontier’s larger (often paid) carry-on.

• Personal item: always free (18 × 14 × 8), all fares.
• Full carry-on: free only with Economy, Premium or Business (or as a purchased add-on on Basic and Standard). The exact add-on price varies; check optional services or booking.
• Checked bags: paid, at prices that vary, unless Business (two checked up to 50 lb each) or eligible Military (1 personal item, 1 carry-on and 2 checked bags free).
• Board First is seating and boarding priority, not a personal-item substitute and not a free pass for an oversized under-seat bag.

Current names: Basic, Standard, Economy, Premium, Business (bundles).

1. Soft bags expand. A backpack that fits empty can fail 18 × 14 × 8 when packed, and Frontier’s sizer does not care about marketing photos.
2. An oversized personal item is charged the carry-on fee. Prices rise from booking to the airport to the gate; waiting until the gate is usually the expensive mistake.
3. Weight: the bag options page may cite up to 35 lb; if the Contract of Carriage does not state a weight, check with Frontier rather than treating 35 lb as a hard limit.
4. The carry-on size is not the same as the personal item size. Frontier’s overhead max (24 × 16 × 10) looks generous next to mainline carriers, but Basic flyers only get the smaller bag free.
5. Gate agents enforce the sizer. “It fit last time” is not a policy.

• On Basic, pack only a true under-seat bag that measures 18 × 14 × 8 or smaller when packed.
• Measure the packed bag, not the empty listing size.
• If you need overhead space, buy the carry-on early or choose Economy or a higher bundle; do not wait for the gate.
• Keep liquids and tech in the personal item so a last-minute forced check of a paid carry-on does not strand essentials (when bin-full gate-check rules apply; check Frontier’s official wording).

Personal item (free on all fares, including Basic): 18 × 14 × 8 in, under seat; the outside size includes handles, wheels and straps; up to 35 lb per the bag options page. Carry-on (paid on Basic and Standard): 24 × 16 × 10 in, up to 35 lb; included in Economy, Premium and Business. An oversized personal item is treated as a carry-on and charged the carry-on fee, which varies by flight.

Shopping guidance (size only): a soft underseat bag of 18 × 14 × 8 or smaller when packed; a safer shopping target is 17 × 13 × 8 or smaller for a soft bag, so expansion still clears the sizer. Measure when packed; the airport sizer is the rule.

See Frontier carry-on size, Frontier baggage fees, and the personal item size hub.

What is Frontier’s personal item size?
18 × 14 × 8 inches, under the seat, free on all fares. Measure the packed exterior including handles, wheels, and straps. An oversized personal item can be treated as a carry-on and charged the carry-on fee (price varies by flight).

Is a personal item free on Frontier Basic?
Yes. Every fare includes one free personal item. Basic does not include a free full-size carry-on.

What if my personal item doesn’t fit the Frontier sizer?
It can be treated as a carry-on and charged the carry-on fee (often highest at the gate). Measure ahead.

Does Frontier allow a backpack as a personal item?
Yes, if it fits 18 × 14 × 8 under the seat when packed.

What’s the difference between Frontier personal item and carry-on?
Personal: 18 × 14 × 8, free, under seat. Carry-on: 24 × 16 × 10, 35 lb, overhead, paid on Basic and Standard, included on Economy and higher bundles.

Do Delta and United personal-item rules differ?
United publishes 9 × 10 × 17 (search phrasing often 17×10×9); Delta stresses under-seat fit (check the sizes on those pages). Frontier’s free 18 × 14 × 8 bag is especially important on Basic. See Delta personal item and United personal item.

• Frontier carry-on size
• Frontier baggage fees
• Delta personal item size
• United personal item size

Confirm sizes and live fees on flyfrontier.com before travel. BagRule is not affiliated with Frontier Airlines.