Allegiant Air Online Check-In Guide (2026)

Allegiant Air online check-in opens 24 hours before departure and closes 45 minutes before flight time. You can check in via the Allegiant app or website for free, but printing a boarding pass at the airport costs $5.

Check-In Timing

Airline	Allegiant Air (G4)
Check-In Opens	24 hours before departure
Check-In Closes	45 minutes before scheduled flight departure
Check-In URL	https://www.allegiantair.com/checkin
Mobile App	Allegiant App (iOS, Android)
Mobile Boarding Pass	Yes
Airport Kiosk	Yes

Step-by-Step Check-In Guide

1. Visit allegiantair.com/checkin or open the Allegiant mobile app. 2. Enter your confirmation number and name. 3. Verify your seat assignments and bag reservations. 4. Pay for any additional bags or seat upgrades if desired. 5. Download your mobile boarding pass or print your paper boarding pass.

Documents Needed

Government-issued photo ID (such as a driver's license or passport) for passengers over 18. Minors traveling alone may need a birth certificate or other identification with birthdate.

Seat Selection

Seats are automatically assigned for free at check-in if not pre-purchased. You can purchase or upgrade seats during online check-in for a fee (typically $0 to $80).

International Check-In Rules

Allegiant Air currently operates exclusively within the continental US and near Canada, so standard domestic check-in rules apply for most flights. A passport is required for non-U.S. citizens.

Group Check-In

If checking in multiple passengers under the same confirmation number, you can select which passengers to check in together. Families are not guaranteed seats together unless purchased in advance.

Troubleshooting

1. 'Unable to check in online' - You may be required to see an agent at the airport for document verification. 2. 'Error message on app' - Try clearing browser cache/cookies or using the website instead. 3. 'Trip no longer shows up' - Ensure you are entering the exact alphanumeric confirmation code without spaces.

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