Cheap flights from Northern Ireland to London from £56

In general, December is the cheapest month to fly from Northern Ireland to London Heathrow Airport. Due to it being the ‘off-season’ during this time, you can expect flight prices to be around £122. The month of October is another great option to travel to London Heathrow Airport, with average flight prices from Northern Ireland averaging around £130.

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 Northern Ireland to London Heathrow Airport in the evening for as low as £343. 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 £770 on average. Flights to London Heathrow Airport from Northern Ireland in the afternoon are generally more expensive because this time of day is more convenient for travellers’ schedules.

Fly from Belfast City to London Heathrow for the best Northern Ireland - London Heathrow flight prices

You are more likely to see cheaper flights to London Heathrow Airport from Northern Ireland when booking weeks ahead of your departure date. In general, you can expect to find flights to London Heathrow Airport for around £140 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 Northern Ireland for as low as £116 on momondo.

British Airways and Loganair are the most popular carriers operating from Northern Ireland to London Heathrow

British Airways, Loganair and easyJet are the top three most popular airlines that fly to London Heathrow Airport from Northern Ireland according to our data. British Airways is the first choice among our users, with 93% of people opting to fly with this airline when travelling to London Heathrow Airport. Keep in mind that there are 3 different airlines that fly to London Heathrow Airport on a routine basis, so you have a few additional options to choose from.

As of September 2026, 20 flights take off from Northern Ireland and land in London Heathrow Airport each day. The most common flight departure time for this route is 06:00, with 42% of daily flights taking off at midday.

The number of flights available between Northern Ireland and London Heathrow Airport is 142 per week as of September 2026. The most frequent departure day is Sun, with 24% of weekly flights leaving on this day.