TravelBookings

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Pre-departure

Online check-in guide

When the check-in window opens for each major carrier we surface, plus a few practical reminders. Use the carrier's own app or website to actually check in — links open directly.

United

UA
24h before departure

Check in online to pick or confirm your seat, add bags, and get a mobile boarding pass. Arrive at the airport ~2 hours before domestic, 3 hours before international.

Check in on United

American

AA
24h before departure

Check in online to pick or confirm your seat, add bags, and get a mobile boarding pass. Arrive at the airport ~2 hours before domestic, 3 hours before international.

Check in on American

Delta

DL
24h before departure

Check in online to pick or confirm your seat, add bags, and get a mobile boarding pass. Arrive at the airport ~2 hours before domestic, 3 hours before international.

Check in on Delta

Alaska

AS
24h before departure

Check in online to pick or confirm your seat, add bags, and get a mobile boarding pass. Arrive at the airport ~2 hours before domestic, 3 hours before international.

Check in on Alaska

JetBlue

B6
24h before departure

Check in online to pick or confirm your seat, add bags, and get a mobile boarding pass. Arrive at the airport ~2 hours before domestic, 3 hours before international.

Check in on JetBlue

Southwest

WN
24h before departure (boarding-position critical)

Check in online to pick or confirm your seat, add bags, and get a mobile boarding pass. Arrive at the airport ~2 hours before domestic, 3 hours before international.

Check in on Southwest

Spirit

NK
24h before departure

Check in online to pick or confirm your seat, add bags, and get a mobile boarding pass. Arrive at the airport ~2 hours before domestic, 3 hours before international.

Check in on Spirit

Frontier

F9
24h before departure

Check in online to pick or confirm your seat, add bags, and get a mobile boarding pass. Arrive at the airport ~2 hours before domestic, 3 hours before international.

Check in on Frontier

Hawaiian

HA
24h before departure

Check in online to pick or confirm your seat, add bags, and get a mobile boarding pass. Arrive at the airport ~2 hours before domestic, 3 hours before international.

Check in on Hawaiian

Lufthansa

LH
23h before departure

Check in online to pick or confirm your seat, add bags, and get a mobile boarding pass. Arrive at the airport ~2 hours before domestic, 3 hours before international.

Check in on Lufthansa

British Airways

BA
24h before departure

Check in online to pick or confirm your seat, add bags, and get a mobile boarding pass. Arrive at the airport ~2 hours before domestic, 3 hours before international.

Check in on British Airways

Air France

AF
30h before departure

Check in online to pick or confirm your seat, add bags, and get a mobile boarding pass. Arrive at the airport ~2 hours before domestic, 3 hours before international.

Check in on Air France

Practical gate-time reminders

  • • Have ID and the booking reference (PNR) handy. International trips need a passport with at least 6 months of validity.
  • • Boarding for most carriers closes ~15 minutes before departure for domestic and ~30 minutes before international.
  • • If you only have a carry-on, mobile boarding passes save you the bag-drop line completely.
  • • Keep the carrier's app installed — gate changes and delay notices push there fastest.
  • • Check baggage allowance on the carrier site before you fly. Fees often jump if added at the airport.
  • • TSA PreCheck and Global Entry can save 30+ minutes at peak times in the US.