There are many ways to complete the check-in process on an Aer Lingus flight, making it a user-friendly and convenient experience. First and foremost, by visiting the Aer Lingus real website, you have the option to use online check-in. To complete the check-in process from the comfort of your home, go to the “Manage Trip” or “Check-In” area, enter your reservation information, and then observe the instructions.