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Airline Personal Item Size Comparison

Compare under-seat personal item policies quickly. Always verify route and fare details before departure.

Personal Item Matrix by Airline

Underseat fit comparison image for personal item size chart

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AirlinePublished Personal Item (in)Published Personal Item (cm)Policy Pattern
Delta Air LinesNot explicitly fixedUnder-seat fit ruleMust fit under seat
American Airlines18 x 14 x 845 x 35 x 20Must fit under seat
Southwest AirlinesNot explicitly fixedUnder-seat fit ruleOne personal item free, under-seat fit required
United Airlines18 x 14 x 845 x 35 x 20Must fit under seat
JetBlueNot explicitly fixedUnder-seat fit ruleOne personal item under-seat fit
Frontier Airlines18 x 14 x 845 x 35 x 20Must fit under seat
Allegiant Air18 x 14 x 845.7 x 35.6 x 20.3Must fit under seat

How to Use This Chart

  • Use published dimensions first when available.
  • When dimensions are not explicit, test packed bag depth under a chair at home.
  • Re-check route updates close to departure date.

Interpretation Notes for Real Travelers

“Under-seat fit” is operationally stricter than many users expect. Aircraft seat structure and pitch can reduce usable depth.

If an airline does not publish strict dimensions, use a conservative compact bag and avoid overfilling front pockets.

Budget carriers are often stricter at gate-side size checks, so keep a small safety margin.

Related Luggage Pages

Underseat Luggage GuideAirline Carry-on RulesBasic Economy Baggage Rules
Policy Sources