Can your pet ride on this flight with this carrier?
Check a real itinerary before you book. Underseat compares your carrier against airline and cabin rules, then gives you Pass, Tight fit, or No with clear reasons.
Airline pet carrier rules are scattered across different websites, buried in PDFs, and measured differently by each airline. Some include wheels, some don't. Underseat checks your carrier against all of them in one place. No PDF hunting. No inch to centimeter math. Just a clear yes or no.
A quick check before you book.
Give us the trip details. We handle the rule comparison and explain the result in plain language.
See an example resultEnter trip
Pick the airline, cabin, pet weight, and carrier size you are planning to fly with.
Compare rules
Each leg is checked against airline and cabin-specific pet carrier limits.
Get verdict
You get Pass, Tight fit, or No with clear reasons you can act on.
Carriers worth checking.
Fit-first picks from the carriers we track. Check one against your trip, or shop it if you are still choosing a bag.
Shop links are affiliate links. We recommend carriers by fit and airline rules first.
A quick check before you book.
Give us the trip details. We handle the rule comparison and explain the result in plain language.
Enter trip
Pick the airline, cabin, pet weight, and carrier size you are planning to fly with.
Compare rules
Each leg is checked against airline and cabin-specific pet carrier limits.
Get verdict
You get Pass, Tight fit, or No with clear reasons you can act on.
Questions before you check?
Can I use this if I do not own a carrier yet?
Yes. Use Find to compare likely-fit options, then run a promising bag through a trip check before you buy.
Does this guarantee my pet carrier will be accepted?
No. Underseat is a compatibility checker, not a guarantee. Airlines make the final decision at check-in or the gate, so confirm current policy before you travel.
Does Checked by us mean the airline approved it?
No. Checked by us means Underseat manually reviewed the carrier details against the airline rules we have on file. It is not airline approval, and the airline still makes the final decision.
Why do multi-leg trips matter?
Each airline can use different under-seat dimensions, weight limits, and cabin rules. We check each leg separately so a carrier that fits one flight is not assumed to fit the next.
What does Tight fit mean?
Tight fit means the carrier is close to a limit, uses incomplete data, or depends on factors like aircraft type. It is worth double-checking before you fly.