Cheap flights from London to Ireland from £15

The month of January is, on average, the cheapest month to fly to Ireland from London, with most prices found around £45. If you’re not able to fly to Ireland in January, then September is your next best option. Flight prices from London to Ireland during September average around £55.

The cheapest day to depart on your flight to Ireland is on a Friday when prices can be found for as low as £326. This is often the case because there is less demand to fly during this day of the week. Flights from London to Ireland on a Monday will generally be more expensive and average around £503. Keep in mind that these prices on both days could fluctuate depending on the season and the demand.

In the afternoon is the cheapest time of day to fly from London to Ireland when you can find flight prices for as low as £141. Flying to Ireland in the afternoon is an ideal time because this is during off-peak travel hours. Flights to Ireland are more costly in the morning, with an average ticket price of £476. Departure times in the morning fall within the peak daily travel times, which is why tickets can be more expensive.

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

You are more likely to see cheaper flights to Ireland from London when booking weeks ahead of your departure date. In general, you can expect to find flights to Ireland for around £131 when searching weeks before you fly. However, flight prices might be lower outside of this timeframe. For example, people recently found flights to Ireland from London for as low as £102 on momondo.

There are 3 cabin classes available to choose from on London to Ireland 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 London to Ireland

Ryanair, Aer Lingus and British Airways are the top three most popular airlines that fly to Ireland from London according to our data. Ryanair is the first choice among our users, with 74% of people opting to fly with this airline when travelling to Ireland. Keep in mind that there are 3 different airlines that fly to Ireland on a routine basis, so you have a few additional options to choose from.

Historically, on average around 17% of flights between London and Ireland have experienced a delay on any given week. The average delay length over the past 12 months has been 103 minutes.

Generally, flights departing in the morning tend to experience fewer delays. Flights departing in the early afternoon 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 12% of their flights experiencing any sort of delay.

97 flights are operational daily from London to Ireland as of March 2026. The most popular departure time for this route is 09:00, with 40% of flights per day taking off at midday.

The number of flights available between London and Ireland is 679 per week as of March 2026. The most frequent departure day is Fri, with 19% of weekly flights leaving on this day.