In most cases, you can check in for your flights within 24 hours before your flight departs on the airline website. All you have to do is go to their site, and type in your record locator number, which you’ll find in your confirmation documents. When you arrive at the airport, simply use one of the kiosks to print your boarding pass. If there’s a line or self-service is not your thing; you can always go to the airline counter.