€39 Cheap flights to London Heathrow Airport

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

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 €432. 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 €681.

The month of October is another great option to travel to London Heathrow Airport, with average flight prices from Ireland averaging around €124.

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 €225. 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 €751 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 €142 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 €102 on momondo.

Flight times vary depending on what airport in Ireland you fly out of and what airport in London Heathrow Airport you fly into. For example, flying from Dublin to London Heathrow takes 1h 15m on average. On the other hand, flying from Cork to London Heathrow takes 1h 15m on average. Keep in mind that it’s always quicker to opt for a non-stop flight, so be sure to check momondo to see if there are any available for your route.

As of February 2026, there are 76 flights per day flying from Ireland to London Heathrow Airport. The most common time of day flights depart is 07:00, with 43% of flights taking off at midday.