Cheap flights from Ireland to London from £36

In general, March is the cheapest month to fly from Ireland to London Heathrow Airport. Due to it being the ‘off-season’ during this time, you can expect flight prices to be around £34. The month of June is another great option to travel to London Heathrow Airport, with average flight prices from Ireland averaging around £35.

On average, the least expensive day to fly to London Heathrow Airport from Ireland is on a Friday. momondo users have found tickets for Friday departures for as low as £465. However, this price may fluctuate depending on the airline, the season, and holidays. Be sure to avoid booking your departure on a Sunday as prices are generally higher than usual. According to our data, the average ticket price to London Heathrow Airport on Sunday is £663.

According to our data, the cheapest time of day to fly to London Heathrow Airport is in the evening. momondo users have found flights departing from Ireland to London Heathrow Airport in the evening for as low as £401. 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 afternoon when prices are £737 on average. Flights to London Heathrow Airport from Ireland in the afternoon are generally more expensive because this time of day is more convenient for travellers’ schedules.

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

You are more likely to see cheaper flights to London Heathrow Airport from Ireland when booking weeks ahead of your departure date. In general, you can expect to find flights to London Heathrow Airport for around £128 when searching weeks before you fly. However, flight prices might be lower outside of this timeframe. For example, people recently found flights to London Heathrow Airport from Ireland for as low as £100 on momondo.

Historically, on average around 13% 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 93 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 13% of their flights experiencing any sort of delay.

The number of flights available between Ireland and London Heathrow Airport is 91 per day as of May 2026. The most frequent departure time is 07:00, with 46% of daily flights leaving at midday.

As of May 2026, 641 flights take off from Ireland and land in London Heathrow Airport each week. The most common flight departure day for this route is Sun, with 17% of weekly flights taking off on this day.