These are general guidelines and can vary based on the specific aircraft type and even the class of service. Airlines frequently update these policies, so it is absolutely crucial to check the specific airline's website or contact them directly before each flight to get the most up-to-date information.
This chart includes major US airlines and a few key international carriers for broader reference. Dimensions are typically listed as Height x Width x Depth (or Length).
AirlineUnderseat Dimensions (General Guideline - Check Specific Flight!)Notes
Major U.S. Airlines
American Airlines
Typically around 18 x 14 x 8 inches (45 x 35 x 20 cm)Can vary significantly by aircraft. Smaller regional jets often have much less space. It's best to check their personal item policy for specific aircraft if possible.
Delta Air Lines
Typically around 18 x 14 x 8 inches (45 x 35 x 20 cm)Similar to American, dimensions can vary depending on the aircraft. Their official policy focuses on an item fitting comfortably under the seat in front of you. Checking specific flight details is recommended.
United Airlines
Typically around 17 x 10 x 9 inches (43 x 25 x 22 cm)United tends to be slightly more restrictive than American and Delta. Again, aircraft type is a key factor. Check their personal item guidelines for potential variations.
Southwest Airlines
Typically around 18.5 x 13.5 x 8.5 inches (47 x 34 x 21.5 cm)Southwest's policy generally aligns with fitting under the seat. Due to their consistent fleet of Boeing 737s, the underseat space tends to be more consistent than airlines with diverse fleets. However, checking their guidelines is still advisable.
Alaska Airlines
Typically around 17 x 14 x 9 inches (43 x 35 x 23 cm)Alaska Airlines generally allows a personal item that fits comfortably under the seat.
Horizon Air,SkyWest and JetBlue AirwaysTypically around 17 x 13 x 8 inches (43 x 33 x 20 cm)JetBlue's underseat space can vary between their Airbus A320/A321 and Embraer E190 aircraft. Checking specific flight details is recommended.
Spirit Airlines
Typically around 18 x 14 x 8 inches (45 x 35 x 20 cm) (for free personal item)Spirit has a strict policy on carry-on and personal item sizes. Exceeding these limits can result in fees. While the general dimension is around this size, ensure your bag fits within their official guidelines.
Frontier Airlines
Typically around 18 x 14 x 8 inches (45 x 35 x 20 cm) (for free personal item)Similar to Spirit, Frontier is strict with their size limits for free personal items. Verify their exact dimensions to avoid additional charges.
Key International Airlines (General Reference - Highly Variable!)
Air Canada
Typically around 17 x 13 x 6 inches (43 x 33 x 16 cm)Air Canada's personal item size can be more restrictive than some US carriers. Always check their specific baggage policy.
British Airways
Typically around 16 x 12 x 6 inches (40 x 30 x 15 cm)British Airways has relatively strict personal item size restrictions. Checking their specific guidelines is essential.
Lufthansa
Typically around 15.7 x 11.8 x 3.9 inches (40 x 30 x 10 cm)Lufthansa's personal item dimensions tend to be quite small. Verify their current policy before traveling.
Air France
Typically around 15.7 x 11.8 x 5.9 inches (40 x 30 x 15 cm)Air France's personal item size is also on the smaller side. Always refer to their official guidelines.
Emirates
Typically around 22 x 15 x 8 inches (55 x 38 x 20 cm)Emirates generally has a more generous personal item size, but it's still crucial to confirm their current policy.
Qatar Airways
Typically around 20 x 15 x 10 inches (50 x 37 x 25 cm)Qatar Airways also tends to have a more accommodating personal item allowance, but verification is still recommended.
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