Comparison
Flying with a cat in the cabin: how airline policies compare
US airlines let cats fly in-cabin under broadly similar rules: a soft carrier around 18 x 11 x 11 inches that fits under the seat, a one-way fee usually between about $95 and $150, an 8-week age minimum, and one pet per passenger, but the exact numbers differ by airline and change often, so verify with YOUR airline before booking.Estimate
In-cabin travel is only for a cat small enough to stand and turn around in an under-seat carrier. The decision is really about matching your cat and route to a specific airline's criteria: carrier dimensions, fee, health-certificate and destination rules, and any breed limits. The figures below are current-as-of-verification estimates, not a promise of today's price.
Applies to: US domestic in-cabin travel with a cat small enough for an under-seat carrier. International routes, cargo travel, and larger cats have different and stricter rules; always confirm on the airline's official page.
Compare
Compare the criteria, not just the priceEstimate
Airlines differ on several axes at once. Line these up for your specific cat and trip before you pick a flight.- Carrier dimensions: most cluster near 18 x 11 x 11 in (soft-sided); some are smaller, so measure the under-seat space and your carrier
- One-way in-cabin fee: roughly $50 to $150 each way depending on the airline
- Age minimum: commonly 8 weeks for domestic travel
- Pets per passenger: generally one cat per carrier, one carrier per passenger
- Restrictions: some carriers add brachycephalic-breed or seasonal/destination limits
Fees and carrier sizes are estimates, verify with the airlineEstimate
Reported one-way in-cabin fees run from about $50 (Allegiant) to $150 (American, Delta, JetBlue, United), with several around $99 to $125. Treat any figure here as a for-comparison estimate: airlines set and revise their own prices, and the amount can depend on when your ticket was issued.- Lower end: around $50 to $99 on some carriers
- Common: about $125
- Upper end: about $150 one way on several major airlines
- Confirm the current fee, carrier limit, and whether it's each-way on the airline's official site before you book
Worked example: Delta's official in-cabin policy (verified 2026-07-20)Fact
Delta's own policy shows how specific one carrier gets: a soft-sided kennel up to 18 x 11 x 11 inches that fits fully under the seat, with the cat able to stand and turn without touching the sides. Delta lists the in-cabin fee as $95 for tickets issued before April 8, 2025 and $150 for tickets issued on or after April 8, 2025 (US/Canada/Puerto Rico/US Virgin Islands). Cats must be at least 8 weeks old for domestic travel, and in-cabin pets are not allowed to Hawaii or a list of international destinations. This is Delta's policy as of the verification date and is cited as an example, not a template for every airline.- Carrier: soft-sided, max 18 x 11 x 11 in, fits fully under the seat
- Fee: $95 (tickets before 2025-04-08) or $150 (on/after 2025-04-08), each way
- Age: at least 8 weeks for domestic travel
- Not permitted in-cabin to Hawaii and several international destinations
- Verify on delta.com before booking, as this can change
Health certificates and destination limitsProfessional guidance
No major US airline requires a health certificate for domestic in-cabin travel, but requirements appear on international routes and for some destinations, and rules like Hawaii's are strict. Because certificate timing (often within 10 days of travel) and destination entry rules vary by airline and jurisdiction, confirm both with your airline and, for international or Hawaii travel, the destination's official requirements.- Domestic in-cabin: generally no health certificate required by the airline
- International routes: a certificate, often issued within a set number of days before travel, is commonly required, verify the exact window
- Destination rules (e.g. Hawaii, many countries) can bar in-cabin pets or add quarantine/testing steps
- Check the airline's official page and the destination's import rules, this page does not replace either
Normal vs keep-watching
Normal: For a small cat on a US domestic route, in-cabin travel means one soft under-seat carrier near 18 x 11 x 11 inches, a one-way fee usually in the roughly $95 to $150 range, an 8-week age minimum, and no health certificate required by the airline, with the precise numbers set by the specific carrier.
Keep watching: Before booking, measure your carrier and your cat, read the chosen airline's official in-cabin policy for the current fee and dimensions, and confirm any destination or breed restriction that applies to your route.
When to contact a vet. This is a policy-comparison guide, not medical advice and not a live fare quote. Confirm current rules directly with your airline, since policies and fees change. For your cat's fitness to fly, sedation questions, or any health concern about travel, consult your veterinarian, and for international or Hawaii travel, verify the destination's official import requirements well ahead of time.
What changes this answer
- Which airline you book: fees, carrier dimensions, and breed rules differ carrier to carrier
- Domestic vs international/Hawaii: health-certificate and destination-entry requirements change sharply
- When your ticket is issued: some airlines (e.g. Delta) price the fee by ticket-issue date
- Your cat's size: in-cabin only works if the cat can stand and turn in an under-seat carrier
Common mistakes
- Treating a quoted fee or carrier size as fixed instead of verifying the airline's current official policy
- Assuming a domestic carrier's rules carry over to an international or Hawaii route
- Booking before measuring the under-seat space and confirming the carrier dimension limit
- Forgetting that in-cabin is only for cats small enough to stand and turn in the carrier
Sources
- Chewy Education, Complete Airline Pet Policy Guide (retailer editorial roundup; tier 3) · Tier 3 · verified 2026-07-20
- Delta Air Lines official pet-travel policy (primary source of record for its own policy; tier 1 for Delta specifics) · Tier 1 · verified 2026-07-20
Real questions cat owners ask
- How much does it cost to fly with a cat in the cabin?
- Do I need a health certificate to fly domestically with my cat?
Stores your cat's carrier dimensions, weight, and vaccination/health-record status in My Cat so a trip plan can flag whether it clears a given airline's in-cabin limits. Set up your Cat Passport.