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$451+ 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 6/6. Fares are subject to change and may not be available on all flights or dates of travel.
PWM — LHR
Jan 11 — Jan 181
Sun 1/11
Sun 1/18
1 adult, Economy
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Cheap 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 December 12, 2025.

This United Airlines deal was found by Cheapflights users on 12/10. 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 United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 12/126:00 amPWM - LHR
1 stop9h 35mUnited Airlines
Fri 12/197:25 amLHR - PWM
1 stop19h 04mUnited Airlines
Deal found 12/10$864
This Finnair deal was found by Cheapflights users on 12/11. 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 Finnair is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 12/126:00 amPWM - LHR
1 stop20h 50mMultiple Airlines
Fri 12/194:25 pmLHR - PWM
1 stop24h 24mMultiple Airlines
Deal found 12/11$1,235
This Kiwi.com deal was found by Cheapflights users on 12/10. 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 Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 12/129:46 amPWM - LGW
1 stop19h 14mMultiple Airlines
Fri 12/192:00 pmLGW - PWM
1 stop25h 36mMultiple Airlines
Deal found 12/10$1,434
This Finnair deal was found by Cheapflights users on 12/11. 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 Finnair is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 12/153:55 pmPWM - LHR
1 stop10h 55mMultiple Airlines
Thu 12/1810:05 amLHR - PWM
1 stop17h 50mMultiple Airlines
Deal found 12/11$1,440
This Icelandair deal was found by Cheapflights users on 12/11. 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 Icelandair is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 12/153:30 pmPWM - LGW
2 stops14h 25mMultiple Airlines
Thu 12/1811:55 amLGW - PWM
2 stops17h 25mMultiple Airlines
Deal found 12/11$1,930
This Delta deal was found by Cheapflights users on 12/11. 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.
Fri 12/122:34 pmPWM - LCY
2 stops13h 56mDelta
Fri 12/197:45 amLCY - PWM
2 stops19h 38mDelta
Deal found 12/11$9,606

Find 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 December 12, 2025.

Most accurate provider

CheapOair
3 stars

Most trusted provider

CheapOair
3 stars

Round-trip from

$585
(Delta)

One-way from

$451
(Kiwi.com)

Popular in

June

Cheapest in

October

Average price

$722
Provider with most accurate pricing for Boston Logan Intl-London (LON) flight deals.
Search Deals
Provider most trusted by Cheapflights users for Boston Logan Intl-London (LON) flights.
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From Portland to United Kingdom
Search Deals
One-way flight from Portland to United Kingdom
Search Deals
Highest demand for flights based on searches. 13% potential increase in price ($100 potential increase over avg. RT price).
Search Deals
Cheapest flight prices on average. 2% potential price decrease ($17 potential savings vs. average RT price).
Search Deals
Average for round-trip flights in December 2025
Search Deals

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 December 12, 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

Fri 3/13

6:25 am-6:20 am

1 stop19h 55m

London Heathrow

Sun 3/15

6:20 am-12:10 am

2 stops21h 50m

$585

PortlandLondon

PWM - LHR

PWMLHR

Portland

Fri 1/23

2:35 pm-9:20 am

2 stops13h 45m

London Heathrow

Fri 1/30

6:40 am-12:20 am

2 stops22h 40m

$601

PortlandLondon

PWM - LHR

PWMLHR

Portland

Wed 1/21

6:16 am-5:40 pm

2 stops30h 24m

London Heathrow

Sun 1/25

5:00 pm-12:20 am

2 stops36h 20m

$613

PortlandLondon

PWM - LHR

PWMLHR

Portland

Sat 1/24

5:30 am-7:50 am

1 stop21h 20m

London Heathrow

Sat 1/31

12:30 pm-10:27 pm

1 stop14h 57m

$618

PortlandLondon

PWM - LHR

PWMLHR

Portland

Sun 1/25

2:35 pm-10:15 am

1 stop14h 40m

London Heathrow

Sun 2/1

11:45 am-12:20 am

2 stops17h 35m

$629

PortlandLondon

PWM - LHR

PWMLHR

Portland

Fri 3/13

6:25 am-6:20 am

1 stop19h 55m

London Heathrow

Mon 3/16

10:00 am-12:10 am

2 stops18h 10m

$629

PortlandGlasgow

PWM - GLA

PWMGLA

Portland

Sun 1/25

2:35 pm-4:35 pm

2 stops21h 00m

Glasgow Intl

Sun 2/1

6:05 am-12:20 am

2 stops23h 15m

$633

PortlandGlasgow

PWM - GLA

PWMGLA

Portland

Sat 1/24

2:35 pm-4:35 pm

2 stops21h 00m

Glasgow Intl

Sat 1/31

6:05 am-11:59 pm

2 stops22h 54m

$633

PortlandLondon

PWM - LCY

PWMLCY

Portland

Sat 1/24

2:35 pm-1:15 pm

2 stops17h 40m

London City

Sat 1/31

10:00 am-11:59 pm

2 stops18h 59m

$654

PortlandLondon

PWM - LHR

PWMLHR

Portland

Fri 5/1

6:00 am-8:45 pm

1 stop9h 45m

London Heathrow

Wed 5/13

11:55 am-11:36 pm

1 stop16h 41m

$669

Flights are sorted by cheapest round-trip flights first.

Deals found on 12/10

Showing 1-10 of 26 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 $187). Flying from Portland, Maine to United Kingdom in December is currently the most expensive (average of $477). 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 December 12, 2025.

Unlike in the morning, when flights are generally more expensive, you can save up to 20% on flights from Portland, Maine to United Kingdom by exploring options for tickets in the afternoon.

What is the cheapest day to fly from Portland, Maine to United Kingdom?

Use this chart to determine the cheapest time to fly round-trip from Portland to United Kingdom. Price data was last updated on December 16, 2024.

Travelers seeking maximum savings on their Portland, Maine to United Kingdom flight should consider departing on Monday at noon when fares are most often at their lowest. Friday evenings flights should be avoided if possible as fares are typically the most expensive at this time.

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 December 12, 2025.
Read through reviews of airlines operating flights from Portland to the United Kingdom, such as Delta, United Airlines, and JetBlue. Reviews also offer insight into each airline's entertainment options, comfort, food, crew/service, and boarding process.
Delta
7.9
Good
8,005 reviews

Boarding

8.1

Entertainment

7.9

Comfort

7.9

Crew

8.5

Overall

7.9

Food

7.3

Reviews

1 / 20
6.0
Good

Jim,Nov 2025

AVL - ATL

The exit row seats without a seat in front are great for leg room but don’t have a fold out entertainment console so you’re forced to use the screen several feet in front of you (there is, at least, a remote). Best to bring a tablet loaded with entertainment or a book.
Delta
7.9
Good
8,005 reviews
Delta
7.9
Good
8,005 reviews

Boarding

8.1

Entertainment

7.9

Comfort

7.9

Crew

8.5

Overall

7.9

Food

7.3

Reviews

1 / 20
6.0
Good

Jim,Nov 2025

AVL - ATL

The exit row seats without a seat in front are great for leg room but don’t have a fold out entertainment console so you’re forced to use the screen several feet in front of you (there is, at least, a remote). Best to bring a tablet loaded with entertainment or a book.
United Airlines
7.4
Good
9,095 reviews
Delta
7.9
Good
8,005 reviews

Boarding

8.1

Entertainment

7.9

Comfort

7.9

Crew

8.5

Overall

7.9

Food

7.3

Reviews

1 / 20
6.0
Good

Jim,Nov 2025

AVL - ATL

The exit row seats without a seat in front are great for leg room but don’t have a fold out entertainment console so you’re forced to use the screen several feet in front of you (there is, at least, a remote). Best to bring a tablet loaded with entertainment or a book.
JetBlue
7.2
Good
2,899 reviews
Delta
7.9
Good
8,005 reviews

Boarding

8.1

Entertainment

7.9

Comfort

7.9

Crew

8.5

Overall

7.9

Food

7.3

Reviews

1 / 20
6.0
Good

Jim,Nov 2025

AVL - ATL

The exit row seats without a seat in front are great for leg room but don’t have a fold out entertainment console so you’re forced to use the screen several feet in front of you (there is, at least, a remote). Best to bring a tablet loaded with entertainment or a book.

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, Scandinavian Airlines, and KLM fly from Portland, Maine to United Kingdom in about 13h 45m. The time it takes to get you to your destination can typically vary by up to 6h 10m. 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 most popular routes from Portland, Maine to United Kingdom?

    Most travelers choose Portland - London Heathrow, Portland - London Gatwick or Portland - Edinburgh Turnhouse 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 $187). Flying from Portland, Maine to United Kingdom in December is currently the most expensive (average of $477). 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 December 12, 2025.
AirlineCheapestAverageFlexibilityOn-time
United AirlinesCheapest$648Average$1,023FlexibilityNo cancel feeOn-time69%
DeltaCheapest$683Average$973FlexibilityNo cancel feeOn-timeN/A
JetBlueCheapest$695Average$746FlexibilityNo cancel feeOn-time62%

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