Cheap flights from Ireland to Lisbon from £27

In general, November 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 £95. If you are unable to visit Lisbon during the month of November, then departing from Ireland during the month January is also very affordable. Most momondo users find prices during this month for around £98.

The cheapest day to depart on your flight to Lisbon is on a Tuesday when prices can be found for as low as £165. This is often the case because there is less demand to fly during this day of the week. When flying out on a Wednesday, the most expensive travel day of the week, you can expect to see flight prices from Ireland to Lisbon for around £305.

At midday is the cheapest time of day to fly from Ireland to Lisbon when you can find flight prices for as low as £91. Flying to Lisbon at midday is an ideal time because this is during off-peak travel hours. Flights to Lisbon are more costly in the evening, with an average ticket price of £265. Departure times in the evening fall within the peak daily travel times, which is why tickets can be more expensive.

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 £141 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 £115 on momondo.

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

KLM, TAP AIR PORTUGAL, and Scandinavian Airlines are the most popular carriers operating from Ireland to Lisbon Humberto Delgado

Ryanair, TAP AIR PORTUGAL and Aer Lingus 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 59% 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 26% 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 116 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. Wednesday 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.

The number of flights available between Ireland and Lisbon is 6 per day as of February 2026. The most frequent departure time is 11:00, with 54% of daily flights leaving at midday.

As of February 2026, 42 flights take off from Ireland and land in Lisbon each week. The most common flight departure day for this route is Sun, with 26% of weekly flights taking off on this day.