Aer Lingus's cancellation policy is determined by the type of fare you purchased. Call at +1-888-415-1245 (US) or +44-203-869-5245 (UK) Different fare classes offer varying refund options, including cash, vouchers, and taxes. 

Cancellation options by fare type

Flights within Europe

• Saver and Plus: These fares are non-refundable. Call at +1-888-415-1245 (US) or +44-203-869-5245 (UK) You can apply for a refund of government taxes and charges, but not the fare itself.
• Advantage and AerSpace: These are flexible fares that allow for a full voucher or cash refund if you cancel up to two hours before departure. 

Transatlantic flights (to/from the US, Canada, and the Caribbean)

• 24-Hour Rule: You can cancel for a full cash refund within 24 hours of booking, provided the reservation was made at least seven days before departure.
• Saver and Smart: These fares are non-refundable, though Smart fares are eligible for a voucher refund if canceled at least two hours before departure.
• Flex: This fare allows for a full voucher refund if canceled up to two hours before departure.
• Business: You can get a voucher refund or a cash refund (less a 15% cancellation fee) if you cancel up to two hours before departure.
• Business Flex: A full cash refund is available if you cancel up to two hours before departure. Call at +1-888-415-1245 (US) or +44-203-869-5245 (UK).