2026 update: Adults flying within the United States need a REAL ID-compliant licence or another TSA-accepted identification document. Travelers without acceptable ID may use TSA ConfirmID for a $45 identity-verification fee, but the process can cause delays.
Quick Answer: When Can You Check In for an Allegiant Flight?
Allegiant check-in opens 24 hours before departure and closes 45 minutes before the scheduled flight time. You can check in through Allegiant’s website, the mobile app or the airport ticket counter.
Allegiant recommends arriving at least two hours before departure. Checked baggage must be dropped at the ticket counter at least one hour but no more than two hours before departure.
Allegiant Check-In Times at a Glance
| Check-in requirement | Official timing |
|---|---|
| Online check-in opens | 24 hours before departure |
| Mobile check-in opens | 24 hours before departure |
| All check-in closes | 45 minutes before departure |
| Recommended airport arrival | At least 2 hours before departure |
| Checked-bag acceptance | 1–2 hours before departure |
| Recommended arrival at gate | At least 1 hour before departure |
These are Allegiant’s general rules. Airport staffing and security lines can vary, so allow additional time during holidays and peak travel periods.
How to Check In for an Allegiant Flight
Option 1: Check In Online
- Open Allegiant’s official online check-in page.
- Enter the passenger’s last name and confirmation number.
- Review the passenger details.
- Confirm the assigned seat or purchase another available seat.
- Verify or add baggage.
- Complete check-in.
- Print the boarding pass or save it electronically.
Online check-in is available from 24 hours until 45 minutes before departure. Allegiant sends a reminder email around the time the check-in window opens.
Option 2: Check In Through the Allegiant App
The Allegiant mobile app allows travelers to:
- Check in
- Access a mobile boarding pass
- Review upcoming trips
- Confirm seats
- Purchase baggage
- Upgrade to Priority Access
- Receive flight-status notifications
Save the boarding pass to your phone’s wallet or take a screenshot in case the airport has weak mobile service.
Option 3: Check In at the Airport
Passengers can check in at the Allegiant ticket counter, but airport check-in closes 45 minutes before departure.
Bring:
- Your confirmation number
- An acceptable government-issued ID
- Any required passenger or accessibility documents
Some passengers may be instructed to complete check-in at the airport even when the online option is available. Follow the instructions displayed in your reservation.
Do You Need to Confirm an Allegiant Reservation 24 Hours Before Departure?
No. You do not need to call or separately confirm the reservation.
However, every traveler must complete check-in and obtain a valid boarding pass before the 45-minute deadline.
Allegiant Boarding Pass Options
You can use:
- A mobile boarding pass in the Allegiant app
- A boarding pass printed at home
- A boarding pass issued at the airport ticket counter
Allegiant recommends using its mobile app or printing the pass before arriving at the airport. Its current check-in page does not publish a universal fixed fee for airport printing, so avoid relying on older articles that quote a guaranteed $5 charge. Check the live fee information shown for your booking.
Passengers traveling under Allegiant Honors military benefits may receive complimentary airport boarding-pass printing.
What Happens to Your Seat During Check-In?
If you did not purchase a seat during booking, Allegiant assigns one automatically at no additional cost when check-in opens.
During online or mobile check-in, you may:
- View your assigned seat
- Purchase another available seat
- Upgrade to an eligible seating option
Seat changes are allowed only while alternatives remain available and before the boarding pass has been printed or downloaded. Allegiant does not guarantee that passengers who skip advance seat selection will sit together.
Allegiant Baggage Rules During Check-In
During check-in, confirm that every paid bag appears on the reservation.
Checked Baggage
Allegiant checked bags must generally remain within:
- 50 pounds
- 80 linear inches, calculated as height + width + length
Bags exceeding these limits may incur overweight or oversized charges. Allegiant allows up to four checked bags to be reserved online, while a maximum of five may be accepted per passenger under its current rules.
Checked bags must reach the ticket counter or bag drop between one and two hours before departure. A passenger arriving with baggage after the one-hour cutoff may not be accepted.
Carry-On and Personal Item
Allegiant includes one personal item free. A full-size carry-on requires payment unless it is included through a bundle or eligible benefit.
Current maximum dimensions are:
| Bag | Maximum size |
|---|---|
| Personal item | 8 × 14 × 18 inches |
| Carry-on bag | 10 × 16 × 22 inches |
Baggage prices vary by route and when the bag is added. Purchasing bags online before arriving at the airport is generally cheaper than paying airport rates.
For the complete allowance check Allegiant Personal Item Size Guide
Can You Add a Bag After Checking In?
Add or update baggage before printing or downloading the boarding pass whenever possible.
Allegiant Airlines allows travelers to purchase baggage through Manage Travel or the app, but changes may become restricted after airport check-in or once a boarding pass has been issued. Airport baggage prices can also be higher.
If the boarding pass has already been generated and the online option is unavailable, contact Allegiant or ask at the ticket counter.
What Identification Do You Need?
Travelers Aged 18 and Older
For domestic U.S. flights, travelers aged 18 or older need:
- A REAL ID-compliant driver’s licence or state ID, or
- Another TSA-accepted document, such as a passport
Since May 7, 2025, a non-REAL-ID-compliant state licence is no longer accepted by itself at airport security.
Starting February 1, 2026, travelers without acceptable identification may pay $45 to use TSA ConfirmID. Verification is not instant or guaranteed to prevent delays, so carrying accepted identification remains the safer option.
Travelers Under 18
TSA does not normally require children under 18 to show identification for domestic flights.
However:
- Allegiant may request proof of age in certain cases.
- Children under 15 cannot travel alone on Allegiant.
- Travelers aged 15 and older are treated as adults under Allegiant’s unaccompanied-travel rules.
Why Can’t You Check In Online?
Common reasons include:
| Problem | What to do |
|---|---|
| Check-in has not opened | Try again within 24 hours of departure |
| Check-in deadline has passed | Contact Allegiant immediately |
| Confirmation details do not match | Use the exact passenger name and code |
| Airport check-in is required | Follow the booking instructions |
| Reservation was recently changed | Reload the updated itinerary |
| App or browser issue | Try another browser or the Allegiant app |
| Special assistance is attached | Complete any required airport verification |
If the reservation still cannot be accessed, open Allegiant Manage Travel or contact the ticket issuer.
What Happens If You Miss the Allegiant Check-In Deadline?
If you have not checked in by 45 minutes before departure:
- Check-in may close.
- Your boarding pass may no longer be issued.
- You can be denied boarding.
- Your ticket may be treated under the applicable no-show rules.
Allegiant expressly requires passengers to check in before the deadline and present a valid boarding pass at the gate.
If you expect to arrive late, contact Allegiant or your booking provider before departure. Read about changing name on Allegaint ticket.
Does Allegiant Offer Priority Check-In?
Allegiant sells Priority Access, which provides earlier boarding. It is not described as a universal expedited airport check-in lane.
Priority Access can be added through Manage Travel or the Allegiant app, subject to availability and the applicable fee.
Military travelers covered by Allegiant Honors receive priority boarding and additional travel benefits, but the program should not be described as a general “military priority check-in” service.
Check-In for Travelers Requiring Assistance
Passengers needing mobility assistance or traveling with an approved portable oxygen concentrator should add a Special Service Request through Manage Travel.
Allegiant recommends requesting assistance in advance. Travelers departing within 48 hours should contact Allegiant directly. Approved portable oxygen concentrators must meet the airline’s labelling and battery requirements.
Allegiant Check-In Checklist
Before leaving for the airport, confirm:
- Check-in is complete.
- The boarding pass is saved or printed.
- The passenger name matches the ID.
- Seat assignments are correct.
- Paid baggage appears in the reservation.
- Your ID is REAL ID compliant or otherwise TSA accepted.
- Checked bags are within the weight and size limits.
- Flight status has been reviewed.
- You can reach the ticket counter at least one hour before departure.
Use Allegiant’s official flight-status tool for current departure and arrival information.
Final Thoughts
The main Allegiant check-in rules are straightforward:
- Check-in opens 24 hours before departure.
- Check-in closes 45 minutes before departure.
- Arrive at least two hours early.
- Drop checked baggage one to two hours before the flight.
- Use the Allegiant app or print your boarding pass before arriving.
- Add bags and change seats before downloading or printing the pass.
- Bring a REAL ID or another TSA-approved identification document.
Need help with an Allegiant ticket issued through Flying Getaway? Call +1 (646) 814-6001.
Frequently Asked Questions
When does Allegiant check-in open?
Online and mobile check-in opens 24 hours before the scheduled departure time.
When does Allegiant check-in close?
All check-in methods close 45 minutes before departure.
How early should I arrive for an Allegiant flight?
Allegiant recommends arriving at least two hours before departure and being through security and at the departure gate at least one hour before the flight.
How do I check in through the Allegiant app?
Open the app, retrieve your reservation, complete check-in, verify your seats and bags, and save the mobile boarding pass.
Can I add baggage after checking in?
It may be possible through Manage Travel or the app, but baggage and seat changes can become restricted after the boarding pass is printed or downloaded. Add bags before completing check-in whenever possible.
Can I change my seat after checking in?
You can change or purchase another available seat before printing or downloading your boarding pass. After the boarding pass is issued, changes may no longer be available online.
What happens if I miss the check-in deadline?
Allegiant may deny boarding because every passenger must complete check-in no later than 45 minutes before departure.
Does Allegiant charge to check in?
Online and mobile check-in are available without a separate check-in charge. Optional services such as seat selection, baggage and Priority Access can cost extra. Check the amount displayed for your itinerary.
Do children need ID for Allegiant flights?
TSA does not usually require identification from children under 18 on domestic flights. Allegiant may request proof of age in some situations.
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Patrick Walker is the travel brain behind Flying Getaway. With a knack for spotting flight deals and a passion for exploring new skies, he helps travelers fly smarter and save more with every trip.
