$313 Cheap Flights from Portland (PWM) to London (LHR)

Popular airlines from Portland Intl. Jetport Airport (PWM) to Heathrow Airport (LHR)

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Cheap Flights from Portland to London (PWM-LHR)

Prices were available within the past 7 days and start at $313 for one-way flights and $628 for round trip, for the period specified. Prices and availability are subject to change. Additional terms apply.

Scandinavian Airlines
JetBlue Airways
JetBlue Airways
JetBlue Airways
JetBlue Airways
JetBlue Airways
JetBlue Airways
Air Canada
United
American Airlines

Find the cheapest month to fly from Portland (PWM) to London (LHR)

April is typically the cheapest month to fly

From $584 - $1,082 per traveler.

Graph displaying average flight prices per month

Alternative airports near London

Prices were available within the past 7 days. Prices and availability are subject to change.

Flights from Portland (PWM) to London (LHR)
Origin airport
Portland Intl. Jetport
Destination airport
Heathrow
Airlines serving
Air Canada, American Airlines, Austrian Airlines, Delta, JetBlue Airways, KLM, Scandinavian Airlines, TAP Portugal, United, Virgin Atlantic
Roundtrip price
$628
Distance
3175 mi

Portland to London Flights

The cheapest times to fly from Portland to London

On average, Thursday can be the cheapest time to fly, according to data from the Airlines Reporting Corporation (ARC), one of the world's biggest databases for global airline sales. The data reveals that you could save up to 16% by flying on a Thursday—the cheapest day to travel on average—instead of a Sunday—the most expensive. Some of the most affordable flights from Portland to London are during the month of October. You can find some of the cheapest flights from Portland to London with Expedia's search tool and vast selection of airlines.

 

The best time to book a flight from Portland to London

Sunday is one of the best days to book for cheap flights from Portland to London: Tickets reserved on a Sunday cost between 6% and 13% less than those reserved on a Friday, according to ARC data. The data also suggests booking early can also lead to cheaper airfares. You could save 24% by buying your tickets for domestic flights at least a month in advance and 10% by booking international flights 2 months in advance.

 

How to find cheap round-trip tickets from Portland to London

Being flexible with your dates and using Expedia's Price Drop Protection and Price Tracking features are some of the best ways of finding a cheap ticket from Portland to London in 2025. You can also book with separate airlines for your outbound and return journeys, from $313 one-way. Expedia also offers Price Drop Protection, so if the cost of your airfare goes down after booking, you'll receive a credit for the difference*. This is available for a small fee, and is free to One Key Gold and Platinum tier members.

 

Expedia's Price Tracking feature means you can stay on top of airfares without manually checking every day. It sends you automated price alerts for cheap Portland to London flights and uses historical data to indicate when the best time to book is. Download Expedia's free app to activate this handy tool in a few easy taps.

 

You could also save big by booking one of Expedia's vacation packages. Bundling together your Portland to London airfare with your accommodations and car rental is often cheaper than booking everything separately. There’s also One Key, Expedia's generous rewards program. Join for free and you could earn One Key cash on most bookings to save on future adventures.

 

*Terms apply.

 

Disclaimer: ARC The statistics are based on average round-trip ticket prices between January and August 2023. The percentages you see are averages.

 

Frequently asked questions

How much does a flight from Portland Intl. Jetport Airport (PWM) to Heathrow Airport (LHR) cost?
Discover the latest flight deals from PWM to LHR by entering your preferred travel dates and searching on Expedia. Easily compare prices by departure date if you have flexibility with your schedule and use handy filters to explore prices for your preferred journey. As a member of One Key™, our free loyalty program, you can use Price Tracking to watch fares and receive notifications if prices go up or down.
What is the cheapest month to fly from PWM to LHR?
The cheapest flights from PWM to LHR are usually during off-peak season, when demand is lower. To save money, avoid flying during public holidays, school breaks and major local events.
What is the cheapest airline that flies from PWM to LHR?
Use the filter tool on Expedia to compare airlines and find the cheapest carrier that'll take you from PWM to LHR. Sort your results by "Price (lowest to highest)" to snap up a great deal.
How many flights per day from Portland Intl. Jetport Airport (PWM) to Heathrow Airport (LHR)?
You'll have to hop on a flight with a layover when traveling from Portland Intl. Jetport Airport (PWM) to Heathrow Airport (LHR). There are no daily direct flights on this route. However, simply filter your search to include one or more stops to discover an option that works for you.
What day of the week has the most flights from PWM to LHR?
Friday is typically the busiest day for flights, while Tuesday is often the quietest.* Just remember that flight schedules can vary based on a number of factors, including the carrier and season.*Busiest/quietest day to travel is based on Expedia flight demand through January to December 2024.
What is the best time to fly from Portland Intl. Jetport Airport (PWM) to Heathrow Airport (LHR)?
To land at Heathrow Airport (LHR) on schedule, pick a flight that takes off from Portland Intl. Jetport Airport (PWM) before 3 PM. The chance of cancellations is 22% higher, on average, for departures after this hour.**Most reliable time of the day and month to travel recommendation is based on January through August 2024 flight status data sourced from OAG's global flight data platform.
Is it cheaper to buy a plane ticket from Portland Intl. Jetport Airport (PWM) to Heathrow Airport (LHR) last-minute?
Waiting until just before your departure to book a ticket from PWM to LHR often results in higher prices. While you might find some last-minute discounts, they aren't always guaranteed. Keep your travel plans flexible for the best chance of snagging a bargain.
Is it cheaper to book a PWM to LHR flight and hotel package?
You'll generally save money by securing a PWM to LHR flight and hotel package compared to booking separately. In fact, you could save hundreds of dollars by bundling with Expedia. And it's simple to manage everything in one convenient place. After choosing your ideal flights and accommodations, consider adding extras like tours, car rentals and activities.
Can I cancel or change the date of my flight from Portland Intl. Jetport Airport (PWM) to Heathrow Airport (LHR)?
If you reserved your PWM to LHR flight in the last 24 hours, you may be able to cancel or modify it without fees. Depending on the airline and the type of ticket you purchased, additional charges may apply for changes after that time. Airline policies and contact information can be found in your itinerary or confirmation email. Or, go to our Customer Service portal for further details.

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