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$220+ 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 7/20. Fares are subject to change and may not be available on all flights or dates of travel.
PWM — LHR
feb. 26 — mar. 51
jue. 2/26
jue. 3/5
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 enero 27, 2026.

This United Airlines deal was found by Cheapflights users on 1/25. 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.
mar. 2/243:05 pm
PWM
-
EDI
1 stop11h 50m
United Airlines
mar. 3/39:25 am
EDI
-
PWM
2 stops16h 44m
United Airlines
Deal found 1/25$620
This American Airlines deal was found by Cheapflights users on 1/26. 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.
vie. 2/2712:29 pm
PWM
-
LHR
1 stop13h 06m
American Airlines
mar. 3/37:50 am
LHR
-
PWM
2 stops15h 21m
American Airlines
Deal found 1/26$628
This Delta deal was found by Cheapflights users on 1/25. 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.
jue. 3/122:30 pm
PWM
-
LHR
1 stop11h 50m
Delta
jue. 3/198:40 am
LHR
-
PWM
2 stops18h 42m
Delta
Deal found 1/25$631
This American Airlines deal was found by Cheapflights users on 1/26. 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.
lun. 2/235:40 pm
PWM
-
GLA
2 stops15h 50m
American Airlines
lun. 3/28:55 am
GLA
-
PWM
2 stops18h 55m
American Airlines
Deal found 1/26$632
This Booking.com deal was found by Cheapflights users on 1/25. 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 Booking.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
lun. 3/97:09 pm
PWM
-
LHR
2 stops32h 01m
Air Canada
dom. 3/159:00 am
LHR
-
PWM
2 stops42h 04m
Air Canada
Deal found 1/25$639
This United Airlines deal was found by Cheapflights users on 1/25. 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.
mié. 3/112:32 pm
PWM
-
MAN
2 stops15h 48m
United Airlines
mié. 3/186:10 am
MAN
-
PWM
2 stops16h 15m
United Airlines
Deal found 1/25$641
This United Airlines deal was found by Cheapflights users on 1/25. 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.
mar. 3/316:00 am
PWM
-
LHR
1 stop10h 35m
United Airlines
mar. 4/146:50 am
LHR
-
PWM
2 stops32h 32m
United Airlines
Deal found 1/25$646
This Delta deal was found by Cheapflights users on 1/26. 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.
mar. 3/312:30 pm
PWM
-
LHR
1 stop13h 20m
Delta
mar. 4/149:55 am
LHR
-
PWM
2 stops19h 51m
Delta
Deal found 1/26$647
This Booking.com deal was found by Cheapflights users on 1/25. 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 Booking.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
mié. 9/26:00 am
PWM
-
LHR
2 stops19h 30m
Air Canada
mar. 9/1512:40 pm
LHR
-
PWM
2 stops39h 17m
Air Canada
Deal found 1/25$658
This United Airlines deal was found by Cheapflights users on 1/26. 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.
mié. 5/65:30 am
PWM
-
LHR
1 stop24h 10m
United Airlines
lun. 5/115:50 pm
LHR
-
PWM
2 stops29h 33m
United Airlines
Deal found 1/26$659
This Air Canada deal was found by Cheapflights users on 1/26. 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.
mié. 9/96:00 am
PWM
-
LHR
2 stops19h 30m
Air Canada
mar. 9/152:05 pm
LHR
-
PWM
2 stops25h 33m
Air Canada
Deal found 1/26$661
This American Airlines deal was found by Cheapflights users on 1/25. 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.
mar. 4/141:18 pm
PWM
-
GLA
2 stops16h 27m
American Airlines
vie. 4/249:30 am
GLA
-
PWM
2 stops18h 40m
American Airlines
Deal found 1/25$675

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 enero 27, 2026.

Most accurate provider

FlightHub
3 stars

Most trusted provider

FlightHub
3 stars

Round-trip from

$620
(United Airlines)

One-way from

$220
(United Airlines)

Popular in

June

Cheapest in

October

Average price

$859
Provider with most accurate pricing for Portland-London (LON) flight deals.
Search Deals
Provider most trusted by Cheapflights users for Portland-London (LON) flights.
Search Deals
From Portland to United Kingdom
Search Deals
One-way flight from Portland to United Kingdom
Search Deals
Highest demand for flights based on searches. 20% potential increase in price ($218 potential increase over avg. RT price).
Search Deals
Cheapest flight prices on average. 4% potential price decrease ($34 potential savings vs. average RT price).
Search Deals
Average for round-trip flights in January 2026
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 enero 27, 2026.
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

vie. 2/27

12:29 pm-6:35 am

1 stop13h 06m

London Heathrow

mar. 3/3

7:50 am-6:11 pm

2 stops15h 21m

$628

PortlandGlasgow

PWM - GLA

PWMGLA

Portland

lun. 2/23

5:40 pm-2:30 pm

2 stops15h 50m

Glasgow Intl

lun. 3/2

8:55 am-10:50 pm

2 stops18h 55m

$632

PortlandEdinburgh

PWM - EDI

PWMEDI

Portland

mar. 2/24

4:15 pm-7:55 am

2 stops34h 40m

Edinburgh Turnhouse

mar. 3/3

9:25 am-9:09 pm

2 stops16h 44m

$634

PortlandManchester

PWM - MAN

PWMMAN

Portland

mié. 3/11

2:32 pm-10:20 am

2 stops15h 48m

Manchester

mié. 3/18

6:10 am-6:25 pm

2 stops16h 15m

$641

PortlandLondon

PWM - LHR

PWMLHR

Portland

mar. 3/31

6:00 am-9:35 pm

1 stop10h 35m

London Heathrow

mar. 4/14

6:50 am-10:22 am

2 stops32h 32m

$646

PortlandLondon

PWM - LHR

PWMLHR

Portland

mar. 3/31

2:30 pm-8:50 am

1 stop13h 20m

London Heathrow

mar. 4/14

9:55 am-12:46 am

2 stops19h 51m

$647

PortlandLondon

PWM - LHR

PWMLHR

Portland

lun. 3/9

2:30 pm-8:05 am

1 stop13h 35m

London Heathrow

dom. 3/15

4:35 pm-11:59 pm

1 stop11h 24m

$659

PortlandLondon

PWM - LHR

PWMLHR

Portland

vie. 2/27

12:29 pm-6:35 am

1 stop13h 06m

London Heathrow

mar. 3/3

1:10 pm-10:59 pm

1 stop14h 49m

$659

PortlandLondon

PWM - LHR

PWMLHR

Portland

jue. 3/12

6:00 am-9:20 pm

1 stop11h 20m

London Heathrow

jue. 3/19

3:10 pm-10:51 pm

1 stop11h 41m

$659

PortlandLondon

PWM - LHR

PWMLHR

Portland

mié. 5/6

5:30 am-10:40 am

1 stop24h 10m

London Heathrow

lun. 5/11

5:50 pm-6:23 pm

2 stops29h 33m

$659

Flights are sorted by cheapest round-trip flights first.

Deals found on 1/26

Showing 1-10 of 36 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 July is currently the most expensive (average of $469). 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.

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 enero 27, 2026.
Read through reviews of airlines operating flights from Portland to the United Kingdom, such as Delta, KLM, and United Airlines. Reviews also offer insight into each airline's entertainment options, comfort, food, crew/service, and boarding process.
Delta
7.9
Good
8,121 reviews

Crew

8.5

Food

7.2

Entertainment

7.8

Overall

7.9

Boarding

8.1

Comfort

7.9

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
8,121 reviews
Delta
7.9
Good
8,121 reviews

Crew

8.5

Food

7.2

Entertainment

7.8

Overall

7.9

Boarding

8.1

Comfort

7.9

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.
KLM
7.7
Good
1,443 reviews
Delta
7.9
Good
8,121 reviews

Crew

8.5

Food

7.2

Entertainment

7.8

Overall

7.9

Boarding

8.1

Comfort

7.9

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
9,207 reviews
Delta
7.9
Good
8,121 reviews

Crew

8.5

Food

7.2

Entertainment

7.8

Overall

7.9

Boarding

8.1

Comfort

7.9

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.
American Airlines
7.2
Good
11,198 reviews
Delta
7.9
Good
8,121 reviews

Crew

8.5

Food

7.2

Entertainment

7.8

Overall

7.9

Boarding

8.1

Comfort

7.9

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
2,890 reviews
Delta
7.9
Good
8,121 reviews

Crew

8.5

Food

7.2

Entertainment

7.8

Overall

7.9

Boarding

8.1

Comfort

7.9

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 American Airlines, United Airlines, and Delta fly from Portland, Maine to United Kingdom in about 13h 06m. The time it takes to get you to your destination can typically vary by up to 21h 34m. 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 - Edinburgh Turnhouse 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 $187). Flying from Portland, Maine to United Kingdom in July is currently the most expensive (average of $469). 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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Alternative routes for Portland to United Kingdom

See prices for flight routes from nearby airports that may be better suited for you.
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Top 5 airlines flying from Portland to United Kingdom

Discover the top 5 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 enero 27, 2026.
AirlineCheapestAverageFlexibilityOn-time
United AirlinesCheapest$648Average$984FlexibilityNo cancel feeOn-time69%
KLMCheapest$664Average$940FlexibilityNo cancel feeOn-time75%
American AirlinesCheapest$679Average$979FlexibilityNo cancel feeOn-time71%
DeltaCheapest$683Average$973FlexibilityNo cancel feeOn-timeN/A
JetBlueCheapest$695Average$731FlexibilityNo cancel feeOn-time62%

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