Cheap flights from Ireland to London from €41

The month of February is another great option to travel to London Heathrow Airport, with average flight prices from Ireland averaging around €135.

The cheapest day to depart on your flight to London Heathrow Airport is on a Friday when prices can be found for as low as €669. This is often the case because there is less demand to fly during this day of the week. On the other hand, Sunday is the most expensive day to depart from Ireland because it is more convenient for both business and leisure travellers. As a result, prices tend to be around €801.

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 €589. 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 €838 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 Shannon 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 €146 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 €118 on momondo.

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

Historically, on average around 15% 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 97 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 14% of their flights experiencing any sort of delay.

As of August 2026, there are 87 flights per day flying from Ireland to London Heathrow Airport. The most common time of day flights depart is 07:00, with 46% of flights taking off at midday.

The number of flights available between Ireland and London Heathrow Airport is 612 per week as of August 2026. The most frequent departure day is Mon, with 19% of weekly flights leaving on this day.