Cheap flights from Portland to London from £233

In general, January is the cheapest month to fly from Portland to London Heathrow Airport. Due to it being the ‘off-season’ during this time, you can expect flight prices to be around £509. The month of October is another great option to travel to London Heathrow Airport, with average flight prices from Portland averaging around £510.

On average, the least expensive day to fly to London Heathrow Airport from Portland is on a Friday. momondo users have found tickets for Friday departures for as low as £499. However, this price may fluctuate depending on the airline, the season, and holidays. Be sure to avoid booking your departure on a Thursday as prices are generally higher than usual. According to our data, the average ticket price to London Heathrow Airport on Thursday is £983.

According to our data, the cheapest time of day to fly to London Heathrow Airport is in the afternoon. momondo users have found flights departing from Portland to London Heathrow Airport in the afternoon for as low as £622. 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 evening when prices are £736 on average. Flights to London Heathrow Airport from Portland in the evening are generally more expensive because this time of day is more convenient for travellers’ schedules.

Fly from Portland to London Heathrow for the best Portland - London Heathrow flight prices

You are more likely to see cheaper flights to London Heathrow Airport from Portland when booking weeks ahead of your departure date. In general, you can expect to find flights to London Heathrow Airport for around £642 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 Portland for as low as £559 on momondo.

You could potentially save up to 53% on your flight if you consider stops on a Portland to London Heathrow Airport flight.

As of April 2026, prices for Portland to London Heathrow Airport flights are approximately 11% more expensive when compared to flights at the same time last year.

As of April 2026, 7 flights take off from Portland and land in London Heathrow Airport each day. The most common flight departure time for this route is 19:00, with 100% of daily flights taking off in the evening.

As of April 2026, 49 flights take off from Portland and land in London Heathrow Airport each week. The most common flight departure day for this route is Mon, with 14% of weekly flights taking off on this day.