Frontier Airlines vs Allegiant Air carry-on size
Standard economy fare · checked 7 October 2026
Frontier Airlines offers the larger cabin allowance of the two on the standard economy fare. Frontier Airlines includes a 14×18×8 in, 35 lb personal item and sells a 24×16×10 in, 35 lb cabin bag as an extra, while Allegiant Air includes a 8×14×18 in personal item and sells a 10×16×22 in cabin bag as an extra. Frontier Airlines and Allegiant Air were last checked against their official pages on 7 October 2026.
Side by side
| Rule | Frontier Airlines | Allegiant Air |
|---|---|---|
| Standard fare | All fares | All fares |
| Cabin bag | Paid extra: 24×16×10 in, 35 lb | Paid extra: 10×16×22 in |
| Personal item | Included: 14×18×8 in, 35 lb | Included: 8×14×18 in |
| Weight limits | cabin bag 35 lb; personal item 35 lb | Not published |
| Last checked | 7 October 2026 | 28 September 2026 |
What is different
- Frontier Airlines' cabin bag limit allows 5.1 cm more on the length than Allegiant Air's: 61 cm against 55.9 cm.
- Against the cabin bag limit, a 22 × 14 × 9 in (55.9 × 35.6 × 22.9 cm) bag fits, with at least 2.5 cm (1 in) to spare on every side at Frontier Airlines, and fits exactly at the limit on the length at Allegiant Air.
- Against the cabin bag limit, a 55 × 40 × 20 cm (21.7 × 15.7 × 7.9 in) bag fits, but with only 0.6 cm (0.3 in) to spare on the width at Frontier Airlines, and fits, but with only 0.6 cm (0.3 in) to spare on the width at Allegiant Air.
- Against the personal item limit, a 40 × 30 × 20 cm (15.7 × 11.8 × 7.9 in) bag fits, but with only 0.3 cm (0.1 in) to spare on the depth at Frontier Airlines, and fits, but with only 0.3 cm (0.1 in) to spare on the depth at Allegiant Air.
- Frontier Airlines and Allegiant Air both list United States among their main markets, so on routes to these countries the two sets of rules can be compared directly.
- Frontier Airlines publishes one fare for cabin baggage, without a free cabin bag; Allegiant Air publishes one fare for cabin baggage, without a free cabin bag.
One bag for both
Cabin bag
- A cabin bag of up to 55.8 × 40.6 × 25.4 cm (22 × 16 × 10 in) is within the size limits of both Frontier Airlines and Allegiant Air.
- Keep it to 15.8 kg (35 lb), the only weight limit published for this bag, set by Frontier Airlines.
- Both Frontier Airlines and Allegiant Air sell this cabin bag as a paid extra on the standard fare.
Personal item
- A personal item of up to 45.7 × 35.5 × 20.3 cm (18 × 14 × 8 in) is within the size limits of both Frontier Airlines and Allegiant Air.
- Keep it to 15.8 kg (35 lb), the only weight limit published for this bag, set by Frontier Airlines.
Every fare
Both airlines publish other fares with different bags. See every Frontier Airlines fare and every Allegiant Air fare.
Frontier Airlines vs Allegiant Air: questions
- Is the Frontier Airlines cabin bag allowance bigger than Allegiant Air's?
- Yes: on the standard economy fare, Frontier Airlines is more generous. Frontier Airlines' cabin bag limit allows 5.1 cm more on the length than Allegiant Air's: 61 cm against 55.9 cm.
- Which bag fits both Frontier Airlines and Allegiant Air?
- A cabin bag of up to 55.8 × 40.6 × 25.4 cm (22 × 16 × 10 in) is within the size limits of both Frontier Airlines and Allegiant Air. Our checker turns your own bag in every direction and tests it on Frontier Airlines and Allegiant Air at once in trip mode.
- Do Frontier Airlines and Allegiant Air charge for a cabin bag?
- On the standard economy fare, Frontier Airlines and Allegiant Air both sell the overhead-bin cabin bag as an extra; Frontier Airlines publishes no fare that includes it, and Allegiant Air publishes no fare that includes it.
Official sources
Frontier Airlines
- https://faq.flyfrontier.com/help/bags-seats-general-info-what-are-the-sizes-and-weight-limits-for-bags — checked on 28 September 2026
- https://www.flyfrontier.com/travel/travel-info/bag-options/ — checked on 7 October 2026
Allegiant Air
- https://www.allegiantair.com/popup/optional-services-fees — checked on 28 September 2026