Cheap flights from Ireland to London from €17

In general, January is the cheapest month to fly from Ireland to London. Due to it being the ‘off-season’ during this time, you can expect flight prices to be around €97. If you are unable to visit London during the month of January, then departing from Ireland during the month February is also very affordable. Most momondo users find prices during this month for around €104.

Our data shows that Friday is the least expensive day to fly to London. Tickets to fly out on this day can be as low as €227. When flying out on a Sunday, the most expensive travel day of the week, you can expect to see flight prices from Ireland to London for around €672.

The cheapest time of day to fly to London is in the evening when flights can be purchased for as low as €169. In contrast, the most expensive time of day to depart to London is in the afternoon when prices are around €784.

Fly from Knock Intl to London Luton for the best Ireland - London flight prices

You are more likely to see cheaper flights to London from Ireland when booking weeks ahead of your departure date. In general, you can expect to find flights to London for around €150 when searching weeks before you fly. However, flight prices might be lower outside of this timeframe. For example, people recently found flights to London from Ireland for as low as €119 on momondo.

There are 4 cabin classes available to choose from on Ireland to London flights. Cabin price and availability will vary by airline so perform a search above to find the right deals for you.

Ryanair, British Airways, and Aer Lingus are the most popular carriers operating from Ireland to London

Ryanair, British Airways and Aer Lingus are the top three most popular airlines that fly to London from Ireland according to our data. Ryanair is the first choice among our users, with 40% of people opting to fly with this airline when travelling to London. Keep in mind that there are 3 different airlines that fly to London on a routine basis, so you have a few additional options to choose from.

Historically, on average around 16% of flights between Ireland and London have experienced a delay on any given week. The average delay length over the past 12 months has been 101 minutes.

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

Tuesday is statistically the day of the week that experiences the fewest delays on this flight route. Friday 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 14% of their flights experiencing any sort of delay.

As of July 2026, there are 103 flights per day flying from Ireland to London. The most common time of day flights depart is 07:00, with 45% of flights taking off at midday.

The number of flights available between Ireland and London is 723 per week as of July 2026. The most frequent departure day is Tue, with 20% of weekly flights leaving on this day.