Cheap flights from London Heathrow Airport to Ireland from £40

The month of January is, on average, the cheapest month to fly to Ireland from London Heathrow Airport, with most prices found around £107. If you’re not able to fly to Ireland in January, then October is your next best option. Flight prices from London Heathrow Airport to Ireland during October average around £114.

The cheapest day to depart on your flight to Ireland is on a Friday when prices can be found for as low as £327. This is often the case because there is less demand to fly during this day of the week. Flights from London Heathrow Airport to Ireland on a Monday will generally be more expensive and average around £505. 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 Heathrow Airport 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 £478. Departure times in the morning fall within the peak daily travel times, which is why tickets can be more expensive.

Fly from London Heathrow to Shannon for the best London Heathrow - Ireland flight prices

You are more likely to see cheaper flights to Ireland from London Heathrow Airport when booking weeks ahead of your departure date. In general, you can expect to find flights to Ireland for around £132 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 Heathrow Airport for as low as £102 on momondo.

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

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

Aer Lingus, British Airways and Ryanair are the top three most popular airlines that fly to Ireland from London Heathrow Airport according to our data. Aer Lingus is the first choice among our users, with 55% 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 13% 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 104 minutes.

Generally, flights departing at night 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. Sunday 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.

75 flights are operational daily from London Heathrow Airport to Ireland as of March 2026. The most popular departure time for this route is 10:00, with 40% of flights per day taking off at midday.

As of March 2026, 525 flights take off from London Heathrow Airport and land in Ireland each week. The most common flight departure day for this route is Tue, with 18% of weekly flights taking off on this day.