JetBlue publishes the strictest in-cabin carrier spec of the major airlines: 17" L x 12.5" W x 8.5" H maximum, with a combined pet-plus-carrier weight cap around 20 pounds. Carriers that clear Delta and United at 18 x 11 x 11 can fail JetBlue's 17-inch length and 8.5-inch height. Measure before you book — not at the gate.
JetBlue's in-cabin carrier rules
- Maximum 17" L x 12.5" W x 8.5" H — straight from JetBlue's own policy
- Leak-proof bottom and good ventilation required
- Combined weight of pet plus carrier: about 20 lbs — small dogs and cats only, no large dogs
- The carrier counts as your carry-on item
- Roughly $125 per pet, per segment; up to two pets per traveler, but the second needs its own seat and fee
- No pets in Mint, and only six pet spots per flight — book early
The JetPaws tag
After check-in, stop at a full-service counter for JetBlue's JetPaws bag tag — it goes on the carrier and confirms your pet is cleared to board. Your dog stays zipped inside the carrier throughout the airport except at the security checkpoint, where the carrier gets x-rayed while you carry your dog through.
What actually fits JetBlue
The 17 x 12.5 x 8.5 box rules out most standard-height carriers in rigid form. You want low-profile and compressible:
- Mr. Peanut's Gold Series V3.0 — flexible height compresses below the 8.5" limit while keeping its structure
- Rover Ready Expandable Carrier — compressed for boarding, expanded at the gate so the tight cabin spec doesn't mean a cramped travel day
Check compressed dimensions on every product page in the travel collection against JetBlue's numbers — length is the spec that surprises people.
Before you fly JetBlue with your dog
- Weigh your dog with the carrier — the ~20 lb combined cap is real; our size guide covers measuring
- Book the pet spot when you book the ticket — six per flight goes fast on popular routes
- Get the JetPaws tag at the counter after check-in
- Line the carrier with a leak-proof pad — JetBlue requires a leak-proof bottom anyway
Airline rules change. This reflects JetBlue's published guidance as of June 2026 — confirm current requirements with JetBlue before you fly. The airline has the final word.
