United Airlines offers various check-in options to accommodate passengers’ preferences and needs. Understanding these options can help ensure a smooth start to your journey.

Online and Mobile App Check-In

Passengers can check in online or via the United Airlines mobile app starting 24 hours before the scheduled departure time. This method allows travelers to select seats, pay for checked baggage, and obtain a boarding pass, which can be saved to a mobile device or printed. Online check-in is available for both domestic and international flights, provided that the departure and connecting airports support mobile boarding passes. It’s important to note that mobile check-in may not be available for certain passengers, such as unaccompanied minors or those traveling with pets.
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Self-Service Kiosks

At many airports, United Airlines provides self-service kiosks, typically located near the ticket counters. These kiosks allow passengers to check in, select or change seats, print boarding passes, and check luggage. To use a kiosk, you’ll need an electronic ticket, passport, credit card, or itinerary barcode. Kiosks are available from 30 minutes up to 3 hours before departure, depending on the airport and destination.

Curbside Check-In

For added convenience, curbside check-in is available at most U.S. airport locations from 30 minutes to 4 hours before the scheduled departure time, depending on the airport and destination. To utilize this service, you’ll need a valid photo ID and your flight reservation code, flight number, destination, or electronic ticket number.

Airport Counter Check-In

If you require special assistance, are traveling with pets, infants, or need to check travel documents such as visas, you can check in at the airport ticket counter. United Airlines agents are available to assist with these needs. It’s recommended to arrive at the airport at least 2 hours before domestic flights and 3 hours before international flights to allow ample time for check-in and security screening.

Voice Check-In

For travelers without internet access, United Airlines offers voice check-in for flights within the U.S. or Canada. This service is available for parties of fewer than 10 people. By calling United’s designated number and saying “check in” during the automated menu, passengers can check in, specify the number of bags to check, inquire about baggage charges, and request boarding documents via email or for pickup at an airport kiosk.
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Auto Check-In

United Airlines provides an auto check-in feature for eligible itineraries. When checking in for the first segment of your flight, you may opt for auto check-in for remaining segments or return flights. When the departure time for the next segment falls within the 24-hour window, the system will automatically check you in and deliver your boarding pass via your preferred method.
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Check-In Deadlines

Effective June 3, 2025, United Airlines requires all domestic passengers to check in at least 45 minutes before departure, regardless of whether they have checked luggage. This change aligns with the existing checked baggage deadline and brings consistency across the board. For international flights, the check-in requirement remains at least 60 minutes prior to departure. Passengers who fail to meet these deadlines may be denied boarding, have their reservations canceled, or be unable to check bags. United Airlines will attempt to accommodate affected passengers but reserves the right to refuse service.

By understanding and utilizing these check-in options and adhering to the specified deadlines, you can ensure a smoother and more efficient start to your journey with United Airlines.