Frontier Airlines Online Check-In Guide (2026)

Frontier Airlines online check-in opens 24 hours before departure and closes 60 minutes before both domestic and international flights. Check in via flyfrontier.com or the Frontier app to avoid the $25 printed boarding pass fee at the airport.

Check-In Timing

Airline	Frontier Airlines (F9)
Check-In Opens	24 hours before departure
Check-In Closes	60 minutes before domestic and international flights
Check-In URL	https://www.flyfrontier.com/travel/my-trips/check-in/?mobile=true
Mobile App	Frontier Airlines app (iOS, Android)
Mobile Boarding Pass	Yes
Airport Kiosk	Yes

Step-by-Step Check-In Guide

1. Visit flyfrontier.com or open the Frontier mobile app. 2. Enter your Last Name and 6-character Confirmation Code. 3. Select passengers to check in. 4. Choose or upgrade your seat assignment. 5. Add any bags or extras. 6. Download or print your boarding pass.

Documents Needed

Valid government-issued photo ID for domestic flights. Passport providing proof of citizenship and identity for international flights. Visa if required by destination country.

Seat Selection

Seat selection is available for a fee during check-in. Elite status members get free upgrades (Diamond at check-in, Platinum 12 hours before, Gold 4 hours before). If no seat is selected, one is randomly assigned for free.

International Check-In Rules

Passport required for international flights. Baggage must be checked in at least one hour prior to departure. Entry requirements are based on country of citizenship.

Group Check-In

Frontier guarantees adjacent seats for children 13 or younger and an accompanying adult at no additional cost, provided they are on the same reservation and seats are available at booking.

Troubleshooting

1. 'Website or app error' - Clear cache, restart browser, or try the mobile app instead of the website. 2. 'Can't find confirmation code' - Check your email for the 6-character alphanumeric code. 3. 'Missed check-in cutoff' - If you fail to check in 60 minutes prior, your ticket will be deemed a No-Show Cancellation.

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