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

View $313 flight on Fri, Aug 22, 2025Opens in a new window

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

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 $591 for round trip, for the period specified. Prices and availability are subject to change. Additional terms apply.

Delta
Sun, Nov 16 - Wed, Nov 26
PWM
Portland
LHR
London
$591 Roundtrip, found 10 hours ago
$591
Roundtrip
found 10 hours ago
Select Delta flight, departing Sun, Nov 16 from Portland to London, returning Wed, Nov 26, priced at $591 found 10 hours ago
Delta
Sun, Nov 16 - Tue, Nov 25
PWM
Portland
LHR
London
$592 Roundtrip, found 10 hours ago
$592
Roundtrip
found 10 hours ago
Select Delta flight, departing Sun, Nov 16 from Portland to London, returning Tue, Nov 25, priced at $592 found 10 hours ago
Delta
Wed, Nov 19 - Fri, Nov 28
PWM
Portland
LHR
London
$598 Roundtrip, found 10 hours ago
$598
Roundtrip
found 10 hours ago
Select Delta flight, departing Wed, Nov 19 from Portland to London, returning Fri, Nov 28, priced at $598 found 10 hours ago
Delta
Wed, Nov 19 - Fri, Nov 28
PWM
Portland
LHR
London
$618 Roundtrip, found 10 hours ago
$618
Roundtrip
found 10 hours ago
Select Delta flight, departing Wed, Nov 19 from Portland to London, returning Fri, Nov 28, priced at $618 found 10 hours ago
Delta
Wed, Nov 19 - Fri, Nov 28
PWM
Portland
LHR
London
$624 Roundtrip, found 10 hours ago
$624
Roundtrip
found 10 hours ago
Select Delta flight, departing Wed, Nov 19 from Portland to London, returning Fri, Nov 28, priced at $624 found 10 hours ago
Scandinavian Airlines
Sat, Sep 13 - Mon, Sep 15
PWM
Portland
LHR
London
$626 Roundtrip, found 14 hours ago
$626
Roundtrip
found 14 hours ago
Select Scandinavian Airlines flight, departing Sat, Sep 13 from Portland to London, returning Mon, Sep 15, priced at $626 found 14 hours ago
JetBlue Airways
Mon, Sep 29 - Tue, Oct 7
PWM
Portland
LHR
London
$637 Roundtrip, found 2 days ago
$637
Roundtrip
found 2 days ago
Select JetBlue Airways flight, departing Mon, Sep 29 from Portland to London, returning Tue, Oct 7, priced at $637 found 2 days ago
JetBlue Airways
Wed, Sep 10 - Thu, Sep 25
PWM
Portland
LHR
London
$638 Roundtrip, found 1 day ago
$638
Roundtrip
found 1 day ago
Select JetBlue Airways flight, departing Wed, Sep 10 from Portland to London, returning Thu, Sep 25, priced at $638 found 1 day ago
Air France
Wed, Nov 19 - Fri, Nov 28
PWM
Portland
LHR
London
$650 Roundtrip, found 10 hours ago
$650
Roundtrip
found 10 hours ago
Select Air France flight, departing Wed, Nov 19 from Portland to London, returning Fri, Nov 28, priced at $650 found 10 hours ago
Air Canada
Tue, Jan 13 - Wed, Jan 21
PWM
Portland
LHR
London
$730 Roundtrip, found 3 days ago
$730
Roundtrip
found 3 days ago
Select Air Canada flight, departing Tue, Jan 13 from Portland to London, returning Wed, Jan 21, priced at $730 found 3 days ago

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.

Select flight to Gatwick LGW. Average driving time to city center is 52 minutes. Flights from $1,819
LGW
Gatwick
Average driving time to city center52 min
Flights from $1,819
Flights from Portland (PWM) to London (LHR)
Origin airport
Portland Intl. Jetport
Destination airport
Heathrow
Airlines serving
Air Canada, Air France, American Airlines, Austrian Airlines, Delta, JetBlue Airways, KLM, Scandinavian Airlines, TAP Portugal, United
Roundtrip price
$590
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 November. 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?
Secure a cheap one-way flight from $313 or cheap return flight from $591 from Portland Intl. Jetport Airport (PWM) to Heathrow Airport (LHR) with Expedia. Enter your travel dates and sort by "Price (lowest to highest)" to find our cheapest flight deals on this route.
What is the cheapest month to fly from Portland Intl. Jetport Airport (PWM) to Heathrow Airport (LHR)?
The cheapest month to fly from PWM to LHR is November, when demand is low. Off-peak season is typically when better flight deals are available between these airports.
What is the cheapest airline that flies from Portland Intl. Jetport Airport (PWM) to Heathrow Airport (LHR)?
To find the cheapest airline that'll fly you from PWM to LHR, use Expedia's filter tool. Customize your search based on what's important to you, such as preferred carriers and flight duration. You can then sort your results by "Price (lowest to highest)" to see the cheapest fares upfront.
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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*Available to One Key members.