Allegiant Airlines Check-In: Online, App & Airport Guide

Allegiant Air check-in opens 24 hours before scheduled departure and closes promptly 45 minutes before departure across web, mobile app, and airport ticket counters. Checked baggage must also meet strict station drop-off deadlines, which generally close 45 minutes prior to departure. If you do not hold a boarding pass or drop checked luggage before these deadlines, you may be denied boarding.

Travelers can check in through the official website, the Allegiant mobile app, or in person at the airport ticket counter. Free digital and printable boarding passes are issued upon completing check-in.

Editorial Note: FareWander independently summarizes publicly available airline guidance. Always review your reservation and current carrier notifications before departure. Last reviewed: October 2026.

Allegiant Check-In at a Glance

How to Check In Online with Allegiant

Checking in via a desktop or mobile browser allows you to review your itinerary, finalize travel add-ons, and print your boarding pass.

1. Step 1: Access the Check-In Portal — Go to the official Allegiant Air website and select the Check-In tab on the navigation menu.
2. Step 2: Retrieve Your Reservation — Enter your 6-character alphanumeric confirmation code and the passenger's last name.
3. Step 3: Review Passenger Information & Seat Selection — Verify traveler names. If you did not pre-purchase an assigned seat, Allegiant’s system will automatically assign an available seat at no additional charge. You may also purchase an upgrade to an available preferred or extra-legroom seat at this stage if desired.
4. Step 4: Confirm Luggage Details — Review the number of personal items, carry-on bags, and checked bags on your booking. If you need to add luggage, paying for bags during check-in is generally less expensive than paying at the airport counter.
5. Step 5: Acknowledge Safety Requirements — Review and accept mandatory federal hazardous materials (Hazmat) regulations.
6. Step 6: Generate Boarding Pass — Download and print your paper boarding pass.

How to Check In Using the Allegiant App

The official Allegiant mobile app (available on iOS and Android) is the most efficient method for digital travel.

1. Retrieve the trip: Open the app and locate your itinerary using your confirmation code and last name, or sign in to your Allegiant account.
2. Begin check-in: Tap Check In once your flight is within the 24-hour departure window.
3. Review passenger details: Confirm traveler names and acknowledge federal safety declarations.
4. Review seat assignment: View your assigned seat or opt to pay for an upgrade on the interactive seat map.
5. Review baggage: Confirm that all carry-on and checked bags are accounted for.
6. Obtain mobile boarding pass: Generate your digital boarding pass. Save it to your Apple Wallet or Google Wallet, or take a clear screenshot to ensure offline access if airport cellular service is intermittent.

How to Check In at the Airport

If you cannot check in electronically, you must check in at an Allegiant airport ticket counter.

• Locate the counter: Allegiant ticket counters are staffed around scheduled flight departures. Counters generally open approximately 2 hours before scheduled departure, though exact hours vary by station.
• Present required documentation: Provide an unexpired, government-issued photo ID and your 6-character confirmation number.
• Check luggage: Place any checked bags on the scale to be weighed, tagged, and accepted.
• Receive boarding pass: The counter agent will issue your physical boarding pass.
• Strict cutoff: Airport ticket counters close exactly 45 minutes prior to scheduled departure. Arrive with enough time to clear counter lines before this deadline passes.

When Does Allegiant Check-In Open?

Allegiant check-in opens 24 hours before your scheduled flight departure for both web browser and mobile app users. Airport ticket counter check-in generally opens 2 hours prior to scheduled departure, depending on the airport and daily flight schedule.

When Does Allegiant Check-In Close?

Allegiant check-in closes strictly 45 minutes before scheduled departure across all channels—including the mobile app, website, and airport ticket counters. Boarding passes cannot be generated or printed once the 45-minute cutoff has passed.

When Is the Allegiant Checked Baggage Cutoff?

Checked baggage must be dropped off, weighed, and accepted at the Allegiant ticket counter no later than 45 minutes before scheduled departure.

Important Difference: The check-in deadline (45 minutes prior) governs whether you can be issued a boarding pass. The checked baggage cutoff (45 minutes prior) governs whether checked luggage can be accepted onto the aircraft. If you check in online at the 45-minute mark but have not yet handed your bags to an agent, your luggage will not be accepted. At larger or high-traffic airports, dropping bags at least 60 to 90 minutes early is strongly advised to prevent missing baggage handling windows.

How Early Should You Arrive for an Allegiant Flight?

Allegiant recommends arriving at the airport at least 2 hours before scheduled domestic departure. This ensures adequate time to park, wait in ticket counter lines for bag drop, and clear the TSA security checkpoint. If you are traveling during peak holiday periods or departing from a major hub, consider arriving even earlier.

How to Get Your Allegiant Boarding Pass

• Mobile Boarding Pass: Issued via the Allegiant mobile app and scannable directly from your smartphone at TSA checkpoints and boarding gates.
• Printed Boarding Pass: Issued at the end of the online check-in process on a web browser. You must print the resulting PDF document on standard paper before heading to the airport.
• Airport-Issued Boarding Pass: Printed by an agent at the ticket counter for travelers who cannot complete digital check-in or require document inspection.

Allegiant Check-In and Seat Assignments

Allegiant uses assigned seating.

• Pre-Purchased Seats: If you reserved specific seats during booking or via Allegiant Manage Booking, your seat assignments will be displayed during check-in.
• Unassigned Seats: If you opted not to pay for a seat assignment, Allegiant’s system automatically assigns you a seat during check-in at no extra charge.
• Upgrades During Check-In: You can view your assigned seat during check-in and optionally pay to switch to an available preferred or extra-legroom seat prior to generating your boarding pass.
• Post-Check-In Restrictions: Once a boarding pass has been printed or downloaded, seat assignments cannot be modified online or at the airport.

For full details on seat maps, legroom options, and fees, visit our Allegiant Seat Selection guide.

Allegiant Check-In and Baggage

Every Allegiant fare includes one personal item (maximum dimensions: 8 × 14 × 18 inches) that must fit underneath the seat in front of you.

• Carry-On and Checked Bags: Overhead carry-on bags and checked bags are not included in standard base fares and incur separate fees.
• Adding Bags During Check-In: You can add paid luggage while completing check-in. Purchasing luggage online or in the app costs less than paying at the airport ticket counter or boarding gate.
• Bag Drop Process: After checking in digitally, take your checked luggage directly to the Allegiant airport ticket counter before the 45-minute baggage cutoff.

To view current size limits and weight thresholds, consult our complete Allegiant Baggage Allowance guide.

What ID Do You Need for Allegiant Check-In?

Identification requirements differ between airline check-in and government security screening:

• Airline Check-In: When checking bags or receiving a boarding pass at the ticket counter, adult passengers must show a valid, unexpired government-issued photo ID that matches the name on the reservation.
• TSA Security Screening: Adult passengers (18 and older) must present acceptable identification at the security checkpoint, such as a REAL ID-compliant state driver's license, a U.S. or foreign passport, a U.S. military ID, or a DHS Trusted Traveler card (Global Entry, NEXUS, SENTRI).
• Minors: TSA does not require children under 18 to present photo ID for domestic travel, though the airline may require proof of age (such as a birth certificate) for lap infants under age 2.

What If Allegiant Online Check-In Is Not Working?

If you encounter an error when attempting to check in online or through the app:

• Verify Your Credentials: Double-check that your 6-character confirmation code and the traveler’s last name match your booking confirmation email exactly.
• Switch Devices/Browsers: Clear your browser cache, open an incognito window, or switch between the Allegiant mobile app and a desktop browser.
• Check for Flight Disruptions: Severe flight delays or aircraft changes can temporarily restrict online check-in access. Check real-time updates via Allegiant Flight Status.
• Mandatory Airport Verification: Certain reservations require manual document review and cannot check in digitally.
• Proceed to the Ticket Counter Early: If online check-in remains inaccessible, arrive at the airport ticket counter at least 2 hours before scheduled departure so an agent can assist you before the 45-minute closing cutoff.

For persistent booking errors, contact Allegiant Customer Care.

Who May Need to Check In at the Airport?

Certain passengers are required by airline policy or federal regulations to check in directly with an airport agent:

• Passengers traveling with service animals.
• Passengers traveling with a lap infant under age 2 requiring age verification.
• Unaccompanied minors.
• Travelers requiring specialized mobility or medical accommodations at the terminal.
• Reservations flagged for manual document verification or itinerary validation.

What Happens If You Miss Allegiant Check-In?

If you fail to check in or do not drop checked luggage before the 45-minute cutoff:

• You may be denied boarding for the scheduled flight.
• Your boarding pass cannot be printed or scanned.
• Your ticket is subject to Allegiant's no-show policy, meaning the value of the flight segment is forfeited unless you purchased travel protection such as Trip Flex.
• Any return or connecting segments on the same reservation may be cancelled.

Review full rebooking and voucher terms in our Allegiant Cancellation Policy guide.

Allegiant Check-In Tips

• Set an alarm for the 24-hour mark: Checking in right when the window opens allows you to secure your assigned seat early and review your travel details.
• Add bags before the airport: If you realize you need extra luggage, add it in the app during check-in to avoid paying higher ticket counter or gate baggage fees.
• Save boarding passes offline: Add your pass to Apple Wallet or Google Wallet, or save a screenshot, in case terminal cellular networks are slow.
• Monitor flight status: Check your flight’s operational status before driving to the airport to catch any gate or schedule changes early.
• Respect the 45-minute line boundary: The 45-minute counter cutoff applies to being processed at the desk, not just standing in line. Allow ample buffer time for airport queues.

Sources & Official References

• Allegiant Air Official Travel Information: allegiantair.com/travel-info – Check-in guidelines and boarding procedures.
• Allegiant Air FAQs: allegiantair.com/faq – Mobile boarding pass, seating, and baggage drop policies.
• Transportation Security Administration (TSA): tsa.gov/travel/security-screening/identification – Acceptable passenger identification and checkpoint standards.