Cheap flights from Southeast Europe to London from £47

In general, August is the cheapest month to fly from Southeast Europe to London Heathrow Airport. Due to it being the ‘off-season’ during this time, you can expect flight prices to be around £39. The month of November is another great option to travel to London Heathrow Airport, with average flight prices from Southeast Europe averaging around £40.

On average, the least expensive day to fly to London Heathrow Airport from Southeast Europe is on a Tuesday. momondo users have found tickets for Tuesday departures for as low as £99. However, this price may fluctuate depending on the airline, the season, and holidays. Be sure to avoid booking your departure on a Monday as prices are generally higher than usual. According to our data, the average ticket price to London Heathrow Airport on Monday is £209.

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 Southeast Europe to London Heathrow Airport in the evening for as low as £147. 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 morning when prices are £196 on average. Flights to London Heathrow Airport from Southeast Europe in the morning are generally more expensive because this time of day is more convenient for travellers’ schedules.

Fly from Bucharest Otopeni Intl to London Heathrow for the best Southeast Europe - London Heathrow flight prices

You are more likely to see cheaper flights to London Heathrow Airport from Southeast Europe when booking weeks ahead of your departure date. In general, you can expect to find flights to London Heathrow Airport for around £174 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 Southeast Europe for as low as £100 on momondo.

British Airways, Air Serbia, and Croatia Airlines are the most popular carriers operating from Southeast Europe to London Heathrow

British Airways, Aegean Airlines and Air Serbia are the top three most popular airlines that fly to London Heathrow Airport from Southeast Europe according to our data. British Airways is the first choice among our users, with 60% of people opting to fly with this airline when travelling to London Heathrow Airport. Keep in mind that there are 4 different airlines that fly to London Heathrow Airport on a routine basis, so you have a few additional options to choose from.

The number of flights available between Southeast Europe and London Heathrow Airport is 17 per day as of May 2026. The most frequent departure time is 13:00, with 44% of daily flights leaving in the afternoon.

121 flights are operational weekly from Southeast Europe to London Heathrow Airport as of May 2026. The most popular departure day for this route is Wed, with 24% of flights per week taking off on this day.