How do I check-in for my Aer Lingus flight?

Modified on: Fri, 14 Nov, 2025 at 3:28 PM

You’ll find the link to the Aer Lingus website below, but you may want to read our check-in guide first.

Before you get started, make sure you have the following handy:

• Your flight reference from your invoice/confirmation. This is not your Thomas Cook booking reference and can be found on the ‘flights’ section of your Thomas Cook invoice labelled ‘airline reference’ or ‘flight booking number’ (see the examples below). The reference is a random selection of numbers and letters (or just letters) in any order. If you're having trouble using your airline reference on the airline’s website, please double-check you’re using the right letters and numbers, as the letters ‘I, O and Z’ can look like the numbers ‘1, 0 and 2’.

For example:

Or:

• Your passport details.

You can check in online with Aer Lingus 48 hours before you're due to depart for all European routes or 24 hours before for USA flights. Online check-in will close 5 hours before your flight departs. Remember to check in for your return flight too!

Check in