Cheap flights from Portland to London from £198

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 £568. The month of April is another great option to travel to London Heathrow Airport, with average flight prices from Portland averaging around £598.

On average, the least expensive day to fly to London Heathrow Airport from Portland is on a Thursday. momondo users have found tickets for Thursday departures for as low as £786. However, this price may fluctuate depending on the airline, the season, and holidays. Be sure to avoid booking your departure on a Sunday as prices are generally higher than usual. According to our data, the average ticket price to London Heathrow Airport on Sunday is £1,319.

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 Portland to London Heathrow Airport in the evening for as low as £832. 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 £995 on average. Flights to London Heathrow Airport from Portland in the afternoon 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 £763 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 £684 on momondo.

There are 2 cabin classes available to choose from on Portland 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.

You could potentially save up to 28% on your flight if you consider stops on a Portland to London Heathrow Airport flight.

As of November 2026, prices for Portland to London Heathrow Airport flights are approximately 43% more expensive when compared to flights at the same time last year.

As of November 2026, 4 flights take off from Portland and land in London Heathrow Airport each day. The most common flight departure time for this route is 18:00, with 100% of daily flights taking off in the evening.

As of November 2026, 28 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 25% of weekly flights taking off on this day.