Cheap flights from Ireland to Lisbon from €42

In general, January is the cheapest month to fly from Ireland to Lisbon. Due to it being the ‘off-season’ during this time, you can expect flight prices to be around €110. If you don’t want to visit Lisbon in January, then you should wait until November to fly from Ireland, when ticket prices are also cheap, with an average price of €126.

The cheapest day to depart from Ireland to Lisbon is on a Wednesday. Travellers who choose to depart for Lisbon on a Wednesday will often find tickets for as low as €413. Be sure to avoid booking your departure on a Thursday as prices are generally higher than usual. According to our data, the average ticket price to Lisbon on Thursday is €1,013.

According to our data, the cheapest time of day to fly to Lisbon is at midday. momondo users have found flights departing from Ireland to Lisbon at midday for as low as €82. Keep in mind that these prices may fluctuate based on what airline you choose and the time of year you plan to travel. If you have a flexible travel schedule, then try to avoid flying in the evening when prices are €1,030 on average. Flights to Lisbon from Ireland in the evening are generally more expensive because this time of day is more convenient for travellers’ schedules.

Fly from Dublin to Lisbon Humberto Delgado for the best Ireland - Lisbon Humberto Delgado flight prices

You are more likely to see cheaper flights to Lisbon from Ireland when booking weeks ahead of your departure date. In general, you can expect to find flights to Lisbon for around €171 when searching weeks before you fly. However, flight prices might be lower outside of this timeframe. For example, people recently found flights to Lisbon from Ireland for as low as €140 on momondo.

There are 3 cabin classes available to choose from on Ireland to Lisbon flights. Cabin price and availability will vary by airline so perform a search above to find the right deals for you.

Aer Lingus, Ryanair, and KLM are the most popular carriers operating from Ireland to Lisbon Humberto Delgado

Ryanair, Aer Lingus and TAP AIR PORTUGAL are the top three most popular airlines that fly to Lisbon from Ireland according to our data. Ryanair is the first choice among our users, with 62% of people opting to fly with this airline when travelling to Lisbon. Keep in mind that there are 3 different airlines that fly to Lisbon on a routine basis, so you have a few additional options to choose from.

Historically, on average around 22% of flights between Ireland and Lisbon have experienced a delay on any given week. The average delay length over the past 12 months has been 112 minutes.

Generally, flights departing at night tend to experience fewer delays. Flights departing in the evening have, in the past, seen delays more frequently in comparison.

Thursday is statistically the day of the week that experiences the fewest delays on this flight route. Monday has historically seen more delays on average compared to the rest of the week.

According to our data, Aer Lingus have had the fewest delays on this route over the last 12 months, with about 13% of their flights experiencing any sort of delay.

As of October 2026, there are 1 flights per day flying from Ireland to Lisbon. The most common time of day flights depart is 18:00, with 38% of flights taking off in the evening.

The number of flights available between Ireland and Lisbon is 7 per week as of October 2026. The most frequent departure day is Wed, with 71% of weekly flights leaving on this day.