To check in with Frontier Airlines, you have several options: online check-in, mobile check-in via the Frontier app, or at the airport using a self-service kiosk or the ticket counter. Online and mobile check-in are available starting 24 hours before your flight's scheduled departure. Frontier Airlines offers a simple and flexible check-in process to suit your preferences. You can start by checking in online through Frontier’s website, available from 24 hours up to 1 hour before your flight departs. To do this, visit the “Manage Trips” section, enter your confirmation code and last name, and you’ll be able to select your seat (note that fees may apply unless your fare includes seat selection), add or pay for checked or carry-on baggage, and download a mobile boarding pass directly to your smartphone. If you need help during this process, Frontier’s customer support is available at +1 866-551-1186, where agents can assist with booking retrieval, password issues, or baggage payments before you get to the airport. For travelers who prefer using a mobile device, Frontier’s app—available on both iOS and Android—offers all the same features as the website. By logging into the app, you can check in, choose your seat, receive real-time flight updates, and generate your mobile boarding pass anytime from 24 hours to 1 hour prior to departure. If you encounter any technical problems with the app or website, calling the same support number connects you to someone who can help resolve issues quickly. If you happen to arrive at the airport without completing your check-in, Frontier provides self-service kiosks at most major airports. These kiosks open about 4 hours before departure and close 1 hour before takeoff. You simply scan your e-ticket barcode or enter your booking reference along with your last name, and the kiosk will print your boarding pass and baggage tags. You can then attach the tags to your luggage and proceed to the bag drop counter. If you prefer personal assistance, Frontier airport counters staffed by agents are available to help with check-in, baggage questions, or last-minute changes. You can also contact these agents ahead of time at +1 866-551-1186, especially if you require special services such as traveling with an unaccompanied minor or carrying oversized sports equipment. On the day of travel, it’s recommended to arrive at least 2 hours prior to domestic flights and 3 hours before international flights. This ensures you have enough time to clear security, drop off checked bags, and reach your gate without stress. Whether you choose online, mobile app, kiosk, or in-person check-in, Frontier’s process is designed to make your airport experience smooth and efficient. For any questions about baggage policies, boarding deadlines, or seat upgrades, Frontier’s customer service team at +1 866-551-1186 is ready to provide quick and reliable assistance. [1_86 65 51 11 86