UNITED Airline Check In +1 - 866 - 551 - 1186

You can check in for your UNITED Airline flight up to 48 hours before departure using their website or mobile app, or 24 hours in advance if you're flying to or from the United States. Check-in is also available at airport counters and kiosks. During the process, you can choose your seat, add luggage, and receive your boarding pass either digitally or in print. UNITED Airline advises arriving at the airport at least 3 hours before your flight to allow enough time for all formalities.