The cheapest flight to Lisbon you can get by boooking 37 days before departure.
The most popular airlines on the route Dublin - Lisbon: Ryanair (FR), Aer Lingus (EI), KLM (KL).
The cheapest flights you can book on the route Dublin Airport (DUB) - Portela (LIS).
Direct flights last about 2h 45min.
Direct flights available 7 days a week.
Direct flights: Aer Lingus (EI), Ryanair (FR).