Aer Lingus gift vouchers are electronic and can be used online.  They have an effective expiry date of one year from purchase. Aer Lingus claim they never expire, but they only last for one year before their balance is reduced by €1.45 per month.

Get savings on flights with discount Aer Lingus gift vouchers. Get cash for unwanted Aer Lingus gift vouchers.

Note that vouchers can only be redeemed at aerlingus.com for passengers travelling wholly on Aer Lingus flights. Vouchers can't be redeemed through Aer Lingus reservation offices, at airport ticket counters or through travel agents.

For official information see: -> www.aerlingus.com/i18n/en/htmlPopups/voucher_help.html