Cheap flights from London to Portland from $335

The cheapest month to fly to Portland from London is in September. Flight prices, which tend to average around $742, are often lower during this time because this is during the off-season. If you don’t want to visit Portland in September, then you should wait until February to fly from London, when ticket prices are also cheap, with an average price of $767.

The cheapest day to depart on your flight to Portland is on a Saturday when prices can be found for as low as $886. This is often the case because there is less demand to fly during this day of the week. The most expensive day to fly to Portland is Sunday, with ticket prices averaging around $1,298.

The cheapest time of day to fly to Portland is at noon when flights can be purchased for as low as $854. In the afternoon is when there is more demand to fly to Portland, so prices are often more expensive at around $956 per ticket.

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

You are more likely to see cheaper flights to Portland from London when booking weeks ahead of your departure date. In general, you can expect to find flights to Portland for around $890 when searching weeks out. However, flight prices might be lower outside of this timeframe. For example, people recently found flights to Portland from London for as low as $789 on momondo.

There are 3 cabin classes available to choose from on London to Portland 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 11% on your flight if you consider stops on a London to Portland flight.

As of March 2026, prices for London to Portland flights are approximately 2% more expensive when compared to flights at the same time last year.

SWISS, Icelandair, and JetBlue are the most popular carriers operating from London to Portland

British Airways, American Airlines and United Airlines are the top three most popular airlines that fly to Portland from London according to our data. British Airways is the first choice among our users, with 61% of people opting to fly with this airline when traveling to Portland. Keep in mind that there are 3 different airlines that fly to Portland on a routine basis, so you have a few additional options to choose from.

Historically, on average around 20% of flights between London and Portland have experienced a delay on any given week. The average delay length over the past 12 months has been 121 minutes.

Generally, flights departing in the early afternoon tend to experience fewer delays. Flights in the early afternoon have, in the past, seen delays more frequently in comparison.

Friday is statistically the day of the week which experiences the fewest number of delays on this flight route. Wednesday has historically seen more delays on average compared to the rest of the week.

According to our data, British Airways have had the least number of delays on this route over the last 12 months; with about 20% of their flights experiencing any sort of delay.