HomeSearch by dateVacation packagesHotelsFlight dealsCar rentalTravel tips & news
Heathrow

$444+ Cheap flights from Portland, ME (PWM) to Heathrow (LHR)

This is the cheapest one-way flight price found by a Cheapflights user in the last 72 hours by searching for a flight departing on 7/10. Fares are subject to change and may not be available on all flights or dates of travel.
PWM — LHR
Jul 8 — Jul 151
Tue 7/8
Tue 7/15
1 adult, Economy
We work with more than 300 partners to bring you better travel deals

Find cheap flights from Portland to Heathrow with Cheapflights

1. Tell us where you want to go

Enter your travel information like dates, passengers, trip type (one-way or round trip), and preferred cabin class then click “Find deals”

2. Select your favorite providers

We find the providers serving your travel needs. Choose up to four travel providers to compare side-by-side for flights, hotels, or car rentals.

3. Compare prices and book

Review each provider’s pricing and select the best option for you! Book through your favorite provider’s website for a seamless experience.

Cheap flight deals from Portland to Heathrow

Discover tips and strategies to find the most affordable flight options for your journey from Portland (PWM) to Heathrow (LHR). Learn about various techniques such as flexible date searches, comparing prices across and setting up price alerts. Use these methods to find the cheapest flights available for your travel needs. Data last updated July 3, 2025.

Round-trip from

$657
(FlightHub)

One-way from

$444
(JetBlue)

Popular in

June

Cheapest in

April

Average price

$1,083
From Portland to London Heathrow
Search Deals
One-way flight from Portland to London Heathrow
Search Deals
Highest demand for flights based on searches. 13% potential increase in price ($149 potential increase over avg. RT price).
Search Deals
Cheapest flight prices on average. 5% potential price decrease ($46 potential savings vs. average RT price).
Search Deals
Average for round-trip flights in July 2025
Search Deals

Find flight deals from Portland to Heathrow

Cheapest flights from Portland to Heathrow
Explore the most affordable flight options available from Portland to Heathrow. Find the lowest fares from popular airlines and budget airlines, with prices last updated on July 3, 2025.

This FlightHub deal was found by Cheapflights users on 7/2. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure FlightHub is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 10/16:33 amPWM - LHR
2 stops28h 52mScandinavian Airlines
Wed 10/157:05 amLHR - PWM
2 stops21h 26mScandinavian Airlines
Deal found 7/2$657
This JetBlue deal was found by Cheapflights users on 7/2. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure JetBlue is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 9/242:17 pmPWM - LHR
1 stop14h 13mJetBlue
Thu 10/211:55 amLHR - PWM
1 stop15h 07mJetBlue
Deal found 7/2$659
This United Airlines deal was found by Cheapflights users on 7/2. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 10/12:25 pmPWM - LHR
1 stop15h 15mUnited Airlines
Wed 10/155:40 pmLHR - PWM
2 stops28h 15mUnited Airlines
Deal found 7/2$730
This Delta deal was found by Cheapflights users on 7/2. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 8/122:36 pmPWM - LHR
1 stop14h 24mDelta
Wed 8/209:00 amLHR - PWM
2 stops20h 48mDelta
Deal found 7/2$745
This KLM deal was found by Cheapflights users on 7/2. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure KLM is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 9/232:41 pmPWM - LHR
1 stop13h 09mKLM
Tue 9/301:05 pmLHR - PWM
1 stop16h 06mKLM
Deal found 7/2$753
This Netflights deal was found by Cheapflights users on 7/3. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Netflights is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 8/176:00 amPWM - LHR
1 stop20h 15mVirgin Atlantic
Sun 8/2411:20 amLHR - PWM
1 stop17h 43mVirgin Atlantic
Deal found 7/3$768
This Air Canada deal was found by Cheapflights users on 7/1. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Air Canada is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 11/16:00 amPWM - LHR
2 stops34h 35mAir Canada
Thu 11/139:00 amLHR - PWM
2 stops43h 17mAir Canada
Deal found 7/1$781

Cheapflights Fare Finder

Customize your flight search to find flights from Portland to Heathrow that fit within your specific budget. Explore options based on user searches and filter the results based on your desired price range. Find flights that match your budget for a cost-effective journey. Over the last 7 days, Cheapflights users made 2,558,603 searches. Data last updated July 3, 2025.
Use the filters below to find and compare flights from Portland to London Heathrow Airport that are best for you.

Fly from

Portland

Fly to

Heathrow

Route

Depart

Return

Price

PortlandLondon

PWM - LHR

PWMLHR

Portland

Wed 10/1

6:33 am-4:25 pm

2 stops28h 52m

London Heathrow

Wed 10/15

7:05 am-11:31 pm

2 stops21h 26m

$657

PortlandLondon

PWM - LHR

PWMLHR

Portland

Wed 9/24

2:17 pm-9:30 am

1 stop14h 13m

London Heathrow

Thu 10/2

11:55 am-10:02 pm

1 stop15h 07m

$659

PortlandLondon

PWM - LHR

PWMLHR

Portland

Wed 10/1

2:25 pm-10:40 am

1 stop15h 15m

London Heathrow

Wed 10/15

5:40 pm-4:55 pm

2 stops28h 15m

$730

PortlandLondon

PWM - LHR

PWMLHR

Portland

Tue 8/12

2:36 pm-10:00 am

1 stop14h 24m

London Heathrow

Wed 8/20

9:00 am-12:48 am

2 stops20h 48m

$745

PortlandLondon

PWM - LHR

PWMLHR

Portland

Tue 9/23

2:41 pm-8:50 am

1 stop13h 09m

London Heathrow

Tue 9/30

1:05 pm-12:11 am

1 stop16h 06m

$753

PortlandLondon

PWM - LHR

PWMLHR

Portland

Sat 11/1

6:00 am-8:35 pm

2 stops34h 35m

London Heathrow

Thu 11/13

9:00 am-11:17 pm

2 stops43h 17m

$781

PortlandLondon

PWM - LHR

PWMLHR

Portland

Thu 7/10

6:05 am-8:45 pm

1 stop9h 40m

$444

PortlandLondon

PWM - LHR

PWMLHR

Portland

Fri 7/25

7:28 am-10:00 am

2 stops21h 32m

$514

PortlandLondon

PWM - LHR

PWMLHR

Portland

Fri 7/25

12:03 pm-6:50 am

1 stop13h 47m

$518

PortlandLondon

PWM - LHR

PWMLHR

Portland

Thu 7/17

2:19 pm-9:30 am

1 stop14h 11m

$542

Flights are sorted by cheapest round-trip flights first.

Deals found on 7/1

Best time to book a flight from Portland to Heathrow

Have a flexible travel schedule? Discover the best time to fly to Heathrow from Portland with our price prediction graph.
Estimated round-trip price
Rates are based on past data. Find the cheapest month and day to book your flight based on your travel requirements, then search for cheap deals.

Cheapflights Insights

Everything you need to know about your flight from Portland to London Heathrow Airport

What is the cheapest month to book a flight from Portland, Maine to London Heathrow Airport?

Currently, November is the cheapest month in which you can book a flight from Portland, Maine to London Heathrow Airport (average of $661). Flying from Portland, Maine to London Heathrow Airport in June is currently the most expensive (average of $1,098). There are several factors that can impact the price of a flight, so comparing airlines, departure airports and flight times can provide users with more options.

What is the cheapest time of day to fly from PWM to LHR?

Find hourly flight availability from Portland to Heathrow. Discover flight options and departure times throughout the day, allowing you to choose a departure time that suits your schedule. Data last updated July 3, 2025.

It’s typically best to fly out from Portland, Maine to London Heathrow Airport in the afternoon. Doing so could potentially save you 10% on the flight price compared to flying in the morning, which is usually more expensive.

Reviews of airlines servicing Heathrow

Get insights into the airlines that provide service to Heathrow. Read reviews, discover amenities, and learn about the overall travel experience offered by airlines. Use this information to make informed decisions when choosing an airline for your flight to Heathrow. Reviews last updated July 3, 2025.
Read through reviews of airlines operating flights from Portland to London Heathrow Airport, such as Delta, United Airlines, and Virgin Atlantic. Reviews also offer insight into each airline's entertainment options, comfort, food, crew/service, and boarding process.
Delta
8.0
Very good
7,982 reviews

Overall

8.0

Food

7.3

Comfort

7.9

Boarding

8.2

Entertainment

7.9

Crew

8.5

Reviews

1 / 20
10.0
Excellent

Kim,May 2025

PIH - SLC

This trip was fine even with delay I had plenty of time to get connection flight!
Delta
8.0
Very good
7,982 reviews
Delta
8.0
Very good
7,982 reviews

Overall

8.0

Food

7.3

Comfort

7.9

Boarding

8.2

Entertainment

7.9

Crew

8.5

Reviews

1 / 20
10.0
Excellent

Kim,May 2025

PIH - SLC

This trip was fine even with delay I had plenty of time to get connection flight!
United Airlines
7.4
Good
8,861 reviews
Delta
8.0
Very good
7,982 reviews

Overall

8.0

Food

7.3

Comfort

7.9

Boarding

8.2

Entertainment

7.9

Crew

8.5

Reviews

1 / 20
10.0
Excellent

Kim,May 2025

PIH - SLC

This trip was fine even with delay I had plenty of time to get connection flight!
Virgin Atlantic
7.4
Good
654 reviews
Delta
8.0
Very good
7,982 reviews

Overall

8.0

Food

7.3

Comfort

7.9

Boarding

8.2

Entertainment

7.9

Crew

8.5

Reviews

1 / 20
10.0
Excellent

Kim,May 2025

PIH - SLC

This trip was fine even with delay I had plenty of time to get connection flight!
JetBlue
7.3
Good
2,916 reviews
Delta
8.0
Very good
7,982 reviews

Overall

8.0

Food

7.3

Comfort

7.9

Boarding

8.2

Entertainment

7.9

Crew

8.5

Reviews

1 / 20
10.0
Excellent

Kim,May 2025

PIH - SLC

This trip was fine even with delay I had plenty of time to get connection flight!
Scandinavian Airlines
7.3
Good
1,416 reviews
Delta
8.0
Very good
7,982 reviews

Overall

8.0

Food

7.3

Comfort

7.9

Boarding

8.2

Entertainment

7.9

Crew

8.5

Reviews

1 / 20
10.0
Excellent

Kim,May 2025

PIH - SLC

This trip was fine even with delay I had plenty of time to get connection flight!

Related info for your journey

Find useful and relevant information for your journey from Portland to Heathrow. Access travel guides, tips, and recommendations to enhance your travel experience. Get information about local attractions, weather, transportation options, and more.

  • What airport do you fly from for flights from Portland to London Heathrow?

    Portland (PWM) is the airport you will fly out of if you book a flight from Portland to London Heathrow. You should not have trouble finding flights to London Heathrow from Portland; the airport handles an average of 0 outbound flights to London Heathrow per day. You should also have plenty of airline options to choose from since 3 airlines have flights from the Portland airport to London Heathrow. It is only a 2.9 mi journey to Portland (PWM) from Portland’s city center.

  • What are the cheapest airlines flying from Portland, Maine to London Heathrow Airport round-trip?

    Scandinavian Airlines, at $657, was found to be the cheapest airline from Portland, Maine to London Heathrow Airport.Alternate airlines to your destination round-trip include JetBlue and United Airlines. These flights start at 30% lower than the current average price 3 months from now.

  • What are the cheapest airlines to fly from Portland, Maine to London Heathrow Airport one-way?

    The cheapest airline one-way is JetBlue, with whom users have recently found tickets for as low as $444. However, be on the lookout for offers from Air Canada and TAP AIR PORTUGAL, as they are both options that can get you from Portland, Maine to London Heathrow Airport for a low price.

  • Can I find deals for flights from Portland to Heathrow that include hotel bookings?

    Yes. In addition to deals on Portland to Heathrow flights, Cheapflights offers vacation packages that include both flights and hotel.

  • How can I find direct flights from Portland to Heathrow?

    After entering your origin and destination, apply the non-stop filter on the search result page to find direct flights from Portland to Heathrow.

  • Can I find deals for business class flights from Portland to Heathrow?

    Yes. Cheapflights offers flight deals from Portland to Heathrow by cabin class. In addition to browsing deals, you can also filter by cabin class on the search results page after making a search.

  • What is the cheapest month to book a flight from Portland, Maine to London Heathrow Airport?

    Currently, November is the cheapest month in which you can book a flight from Portland, Maine to London Heathrow Airport (average of $661). Flying from Portland, Maine to London Heathrow Airport in June is currently the most expensive (average of $1,098). There are several factors that can impact the price of a flight, so comparing airlines, departure airports and flight times can provide users with more options.

See more FAQs

Traveling to a place near Portland?

Book flights to Portland if you plan to visit one of these locations
Hounslow
Hayes
Thornton Heath
Canterbury
Harrow
Dover
Stratford-upon-Avon
Gatwick
Orpington
Watford
Northampton
Croydon
Folkestone
Borehamwood
Broadway
Aylesbury
Chelmsford
Brentwood
Chichester
Swindon

Browse thousands of different options on Cheapflights for your next trip

Toggle through the tabs below to find thousands of options on Cheapflights for your next trip.

Top 3 airlines flying from Portland to Heathrow

Discover the top 3 airlines that operate flights from Portland to Heathrow. Compare their services, reliability, and customer satisfaction ratings to choose the airline that best suits your travel preferences and needs. Over the last 7 days, Cheapflights users made 2,558,603 searches. Data last updated July 3, 2025.
AirlineCheapestAverageFlexibilityOn-time
JetBlueCheapest$586Average$678FlexibilityNo cancel feeOn-time62%
United AirlinesCheapest$665Average$831FlexibilityNo cancel feeOn-time69%
DeltaCheapest$825Average$963FlexibilityNo cancel feeOn-timeN/A

100% Free

Cheapflights is completely free to use, so you can start saving the moment you arrive.

Book with Flexibility

Our users can plan ahead with confidence and find flights with no change fees

Travel Smart

Millions of people come to us for their flight needs every year. We help make travel planning easy by providing useful insights and data-driven graphs that can inform your decisions.