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$349+ Cheap flights from Portland, ME (PWM) to the United Kingdom

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 9/19. Fares are subject to change and may not be available on all flights or dates of travel.
PWM — LHR
Oct 11 — Oct 181
Sat 10/11
Sat 10/18
1 adult, Economy
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Cheap flight deals from Portland to United Kingdom

Keep the following information in mind while searching for Portland to United Kingdom flight deals. Data was last updated September 11, 2025.

Round-trip from

$524
(Delta)

One-way from

$349
(Expedia)

Popular in

July

Cheapest in

October

Average price

$790
From Portland to United Kingdom
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One-way flight from Portland to United Kingdom
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Highest demand for flights based on searches. 17% potential increase in price ($186 potential increase over avg. RT price).
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Cheapest flight prices on average. 3% potential price decrease ($30 potential savings vs. average RT price).
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Average for round-trip flights in September 2025
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Find flight deals from Portland to United Kingdom

Cheapest flights from Portland to United Kingdom
Explore the most affordable flight options available from Portland to United Kingdom. Find the lowest fares from popular airlines and budget airlines, with prices last updated on September 11, 2025.

This Delta deal was found by Cheapflights users on 9/11. 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.
Mon 11/101:25 pmPWM - LHR
1 stop13h 25mDelta
Tue 11/188:55 amLHR - PWM
2 stops19h 59mDelta
Deal found 9/11$524
This Delta deal was found by Cheapflights users on 9/11. 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.
Wed 10/82:38 pmPWM - LHR
1 stop15h 47mDelta
Wed 10/159:00 amLHR - PWM
2 stops20h 05mDelta
Deal found 9/11$525
This Delta deal was found by Cheapflights users on 9/11. 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.
Sat 11/82:38 pmPWM - LHR
1 stop24h 32mDelta
Tue 11/1811:45 amLHR - PWM
2 stops17h 09mDelta
Deal found 9/11$526
This Delta deal was found by Cheapflights users on 9/9. 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.
Fri 9/262:41 pmPWM - LHR
1 stop14h 19mDelta
Fri 10/1011:45 amLHR - PWM
2 stops17h 20mDelta
Deal found 9/9$574
This Delta deal was found by Cheapflights users on 9/9. 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.
Fri 10/32:41 pmPWM - LHR
1 stop14h 19mDelta
Fri 10/1011:45 amLHR - PWM
2 stops17h 20mDelta
Deal found 9/9$575
This KLM deal was found by Cheapflights users on 9/11. 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.
Fri 10/32:41 pmPWM - LHR
1 stop13h 09mKLM
Fri 10/104:05 pmLHR - PWM
1 stop13h 00mKLM
Deal found 9/11$582
This Delta deal was found by Cheapflights users on 9/10. 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.
Fri 11/142:30 pmPWM - LCY
2 stops14h 00mDelta
Tue 11/1810:00 amLCY - PWM
2 stops18h 54mDelta
Deal found 9/10$632
This Delta deal was found by Cheapflights users on 9/9. 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.
Sun 11/306:00 amPWM - GLA
2 stops25h 45mDelta
Wed 12/106:05 amGLA - PWM
2 stops22h 16mDelta
Deal found 9/9$726
This British Airways deal was found by Cheapflights users on 9/9. 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 British Airways is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 12/15:37 pmPWM - GLA
2 stops15h 53mMultiple Airlines
Sun 12/79:20 amGLA - PWM
2 stops18h 40mMultiple Airlines
Deal found 9/9$728
This American Airlines deal was found by Cheapflights users on 9/11. 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 American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 10/265:59 pmPWM - EDI
2 stops15h 16mAmerican Airlines
Sun 11/25:20 amEDI - PWM
2 stops21h 34mAmerican Airlines
Deal found 9/11$733
This United Airlines deal was found by Cheapflights users on 9/9. 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.
Tue 12/93:00 pmPWM - EDI
1 stop11h 55mUnited Airlines
Mon 12/1512:30 pmEDI - PWM
1 stop11h 24mUnited Airlines
Deal found 9/9$760
This United Airlines deal was found by Cheapflights users on 9/9. 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.
Fri 10/242:34 pmPWM - EDI
2 stops12h 31mUnited Airlines
Fri 10/3111:30 amEDI - PWM
1 stop11h 29mUnited Airlines
Deal found 9/9$762

Cheapflights Fare Finder

 
Customize your flight search to find flights from Portland to United Kingdom 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 September 11, 2025.
Use the filters below to find and compare flights from Portland to the United Kingdom that are best for you.

Fly from

Portland

Fly to

United Kingdom

Route

Depart

Return

Price

PortlandLondon

PWM - LHR

PWMLHR

Portland

Mon 11/10

1:25 pm-7:50 am

1 stop13h 25m

London Heathrow

Tue 11/18

8:55 am-11:54 pm

2 stops19h 59m

$524

PortlandLondon

PWM - LHR

PWMLHR

Portland

Mon 11/10

1:25 pm-6:25 am

1 stop12h 00m

London Heathrow

Wed 11/19

8:55 am-11:54 pm

2 stops19h 59m

$525

PortlandLondon

PWM - LHR

PWMLHR

Portland

Sun 11/9

4:53 pm-8:45 am

1 stop10h 52m

London Heathrow

Wed 11/19

9:00 am-11:54 pm

2 stops19h 54m

$525

PortlandLondon

PWM - LHR

PWMLHR

Portland

Sat 11/8

2:38 pm-8:10 pm

1 stop24h 32m

London Heathrow

Wed 11/19

8:55 am-11:54 pm

2 stops19h 59m

$525

PortlandLondon

PWM - LHR

PWMLHR

Portland

Fri 9/26

2:41 pm-10:00 am

1 stop14h 19m

London Heathrow

Fri 10/10

11:45 am-12:05 am

2 stops17h 20m

$574

PortlandLondon

PWM - LHR

PWMLHR

Portland

Fri 10/3

2:41 pm-10:00 am

1 stop14h 19m

London Heathrow

Fri 10/10

11:45 am-12:05 am

2 stops17h 20m

$575

PortlandLondon

PWM - LHR

PWMLHR

Portland

Sun 10/26

11:41 am-7:05 am

1 stop15h 24m

London Heathrow

Sun 11/2

11:30 am-12:05 am

2 stops17h 35m

$614

PortlandLondon

PWM - LHR

PWMLHR

Portland

Sun 10/26

6:00 am-9:00 am

1 stop23h 00m

London Heathrow

Sun 11/2

10:45 am-10:19 pm

1 stop16h 34m

$622

PortlandLondon

PWM - LHR

PWMLHR

Portland

Sat 11/8

2:38 pm-8:10 pm

1 stop24h 32m

London Heathrow

Sun 11/16

4:35 pm-11:54 pm

1 stop12h 19m

$622

PortlandLondon

PWM - LCY

PWMLCY

Portland

Fri 11/14

6:35 am-9:30 am

2 stops21h 55m

London City

Tue 11/18

9:20 am-11:54 pm

2 stops43h 34m

$632

Flights are sorted by cheapest round-trip flights first.

Deals found on 9/11

Showing 1-10 of 41 results
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Best time to book a flight from Portland to United Kingdom

Have a flexible travel schedule? Discover the best time to fly to United Kingdom 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 the United Kingdom

What is the cheapest month to book a flight from Portland, Maine to United Kingdom?

Currently, November is the cheapest month in which you can book a flight from Portland, Maine to United Kingdom (average of $661). Flying from Portland, Maine to United Kingdom 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 GB?

Find hourly flight availability from Portland to United Kingdom. Discover flight options and departure times throughout the day, allowing you to choose a departure time that suits your schedule. Data last updated September 11, 2025.

Regardless of the time of day you decide to fly, the ticket price will remain around the same. Book flights from Portland, Maine to United Kingdom as you normally would.

Reviews of airlines servicing United Kingdom

Get insights into the airlines that provide service to United Kingdom. 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 United Kingdom. Reviews last updated September 11, 2025.
Read through reviews of airlines operating flights from Portland to the United Kingdom, such as Delta, United Airlines, and American Airlines. Reviews also offer insight into each airline's entertainment options, comfort, food, crew/service, and boarding process.
Delta
8.0
Very good
7,960 reviews

Comfort

7.9

Overall

8.0

Boarding

8.2

Food

7.3

Crew

8.5

Entertainment

7.9

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
7,960 reviews
Delta
8.0
Very good
7,960 reviews

Comfort

7.9

Overall

8.0

Boarding

8.2

Food

7.3

Crew

8.5

Entertainment

7.9

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
8,937 reviews
Delta
8.0
Very good
7,960 reviews

Comfort

7.9

Overall

8.0

Boarding

8.2

Food

7.3

Crew

8.5

Entertainment

7.9

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!
American Airlines
7.2
Good
10,000 reviews
Delta
8.0
Very good
7,960 reviews

Comfort

7.9

Overall

8.0

Boarding

8.2

Food

7.3

Crew

8.5

Entertainment

7.9

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
7.2
Good
2,913 reviews
Delta
8.0
Very good
7,960 reviews

Comfort

7.9

Overall

8.0

Boarding

8.2

Food

7.3

Crew

8.5

Entertainment

7.9

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 United Kingdom. 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 United Kingdom?

    For a flight from Portland to United Kingdom, you will be flying from Portland. Portland (PWM) is just 2.9 mi from the center of the city.

  • How long is the flight from Portland, Maine to United Kingdom?

    Airlines like Delta, American Airlines, and United Airlines fly from Portland, Maine to United Kingdom in about 13h 25m. The time it takes to get you to your destination can typically vary by up to 1h 52m. The distance from Portland, Maine to United Kingdom is about 3173 mi. Both multi-stop and nonstop flights can be found to your destination and back.

  • What are the cheapest airlines to fly from Portland, Maine to United Kingdom one-way?

    For one-way options, check prices for JetBlue. According to our data, you can fly for as low as $349. Users have also found prices from $452 and $457 on American Airlines and Scandinavian Airlines, respectively.

  • What are the most popular routes from Portland, Maine to United Kingdom?

    Most travelers choose Portland - Edinburgh Turnhouse, Portland - London City or Portland - London Gatwick when deciding on the best route from Portland, Maine to United Kingdom.

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

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

  • How can I find direct flights from Portland to United Kingdom?

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

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

    Yes. Cheapflights offers flight deals from Portland to United Kingdom 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 United Kingdom?

    Currently, November is the cheapest month in which you can book a flight from Portland, Maine to United Kingdom (average of $661). Flying from Portland, Maine to United Kingdom 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

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Top 3 airlines flying from Portland to United Kingdom

Discover the top 3 airlines that operate flights from Portland to United Kingdom. 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 September 11, 2025.
AirlineCheapestAverageFlexibilityOn-time
JetBlueCheapest$586Average$712FlexibilityNo cancel feeOn-time62%
DeltaCheapest$648Average$973FlexibilityNo cancel feeOn-timeN/A
United AirlinesCheapest$648Average$980FlexibilityNo cancel feeOn-time69%

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