HomeSearch by dateVacation packagesHotelsFlight dealsCar rentalTravel tips & news
United Kingdom

$396+ 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 3/21. Fares are subject to change and may not be available on all flights or dates of travel.
PWM — LHR
feb. 25 — mar. 41
mar. 2/25
mar. 3/4
1 adult, Economy
We work with more than 300 partners to bring you better travel deals

Find cheap flights from Portland to United Kingdom 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 United Kingdom

Keep the following information in mind while searching for Portland to United Kingdom flight deals. Data was last updated febrero 20, 2025.

Most accurate provider

FlightHub
3 stars

Most trusted provider

FlightHub
3 stars

Round-trip from

$589
(JetBlue)

One-way from

$396
(Kiwi.com)

Popular in

June

Cheapest in

November

Average price

$810
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. 18% potential increase in price ($206 potential increase over avg. RT price).
Search Deals
Cheapest flight prices on average. 3% potential price decrease ($32 potential savings vs. average RT price).
Search Deals
Average for round-trip flights in February 2025
Search Deals

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 febrero 20, 2025.

This JetBlue deal was found by Cheapflights users on 2/20. 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.
dom. 4/66:10 amPWM - LHR
1 stop9h 35mJetBlue
dom. 4/138:15 amLHR - PWM
1 stop13h 25mJetBlue
Deal found 2/20$589
This United Airlines deal was found by Cheapflights users on 2/19. 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.
lun. 3/107:20 pmPWM - LHR
1 stop11h 30mUnited Airlines
vie. 3/283:00 pmLHR - PWM
2 stops36h 15mUnited Airlines
Deal found 2/19$677
This Delta deal was found by Cheapflights users on 2/20. 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.
lun. 3/105:30 amPWM - LHR
1 stop20h 50mDelta
mié. 3/196:30 amLHR - PWM
2 stops20h 44mDelta
Deal found 2/20$679
This Kiwi.com deal was found by Cheapflights users on 2/19. 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.
lun. 3/312:21 pmPWM - LGW
1 stop16h 39mMultiple Airlines
jue. 3/62:00 pmLGW - PWM
2 stops32h 38mMultiple Airlines
Deal found 2/19$681
This Finnair deal was found by Cheapflights users on 2/20. 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.
lun. 3/101:01 pmPWM - LHR
1 stop13h 34mMultiple Airlines
mié. 3/191:10 pmLHR - PWM
1 stop13h 47mMultiple Airlines
Deal found 2/20$690
This Delta deal was found by Cheapflights users on 2/20. 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. 4/33:08 pmPWM - MAN
1 stop11h 37mDelta
jue. 4/102:00 pmMAN - PWM
1 stop15h 23mDelta
Deal found 2/20$695
This American Airlines deal was found by Cheapflights users on 2/20. 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.
jue. 4/312:55 pmPWM - MAN
2 stops17h 40mAmerican Airlines
jue. 4/107:00 amMAN - PWM
2 stops20h 49mAmerican Airlines
Deal found 2/20$714
This KLM deal was found by Cheapflights users on 2/19. 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.
mié. 3/193:00 pmPWM - EDI
1 stop13h 45mKLM
mié. 3/269:15 amEDI - PWM
2 stops19h 00mKLM
Deal found 2/19$727
This American Airlines deal was found by Cheapflights users on 2/19. 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.
mié. 3/194:11 pmPWM - EDI
2 stops19h 14mAmerican Airlines
mié. 3/267:25 amEDI - PWM
2 stops19h 32mAmerican Airlines
Deal found 2/19$729
This Air Canada deal was found by Cheapflights users on 2/20. 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.
jue. 4/36:15 amPWM - MAN
3 stops23h 10mAir Canada
jue. 4/106:05 amMAN - PWM
3 stops22h 22mAir Canada
Deal found 2/20$744
This KLM deal was found by Cheapflights users on 2/20. 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.
lun. 3/171:02 pmPWM - LHR
1 stop13h 48mKLM
lun. 3/244:35 pmLHR - PWM
1 stop11h 40mKLM
Deal found 2/20$750
This United Airlines deal was found by Cheapflights users on 2/20. 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.
dom. 4/69:30 amPWM - EDI
1 stop20h 05mUnited Airlines
dom. 4/139:00 amEDI - PWM
2 stops37h 22mUnited Airlines
Deal found 2/20$751

Find flights from Portland to United Kingdom within your budget

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 febrero 20, 2025.

Fly from

Portland

Fly to

United Kingdom

Route

Depart

Return

Price

PortlandLondon

PWM - LHR

PWMLHR

Portland

dom. 4/6

6:10 am-8:45 pm

1 stop9h 35m

London Heathrow

dom. 4/13

8:15 am-4:40 pm

1 stop13h 25m

$589

PortlandLondon

PWM - LHR

PWMLHR

Portland

lun. 3/10

7:20 pm-10:50 am

1 stop11h 30m

London Heathrow

vie. 3/28

3:00 pm-11:15 pm

2 stops36h 15m

$677

PortlandLondon

PWM - LHR

PWMLHR

Portland

lun. 3/10

5:30 am-6:20 am

1 stop20h 50m

London Heathrow

mié. 3/19

6:30 am-11:14 pm

2 stops20h 44m

$679

PortlandLondon

PWM - LGW

PWMLGW

Portland

lun. 3/3

12:21 pm-10:00 am

1 stop16h 39m

London Gatwick

jue. 3/6

2:00 pm-5:38 pm

2 stops32h 38m

$681

PortlandLondon

PWM - LHR

PWMLHR

Portland

lun. 3/10

1:01 pm-6:35 am

1 stop13h 34m

London Heathrow

mié. 3/19

1:10 pm-10:57 pm

1 stop13h 47m

$690

PortlandManchester

PWM - MAN

PWMMAN

Portland

jue. 4/3

3:08 pm-7:45 am

1 stop11h 37m

Manchester

jue. 4/10

2:00 pm-12:23 am

1 stop15h 23m

$695

PortlandManchester

PWM - MAN

PWMMAN

Portland

jue. 4/3

12:55 pm-11:35 am

2 stops17h 40m

Manchester

jue. 4/10

7:00 am-10:49 pm

2 stops20h 49m

$714

PortlandEdinburgh

PWM - EDI

PWMEDI

Portland

mié. 3/19

3:00 pm-8:45 am

1 stop13h 45m

Edinburgh Turnhouse

mié. 3/26

9:15 am-12:15 am

2 stops19h 00m

$727

PortlandEdinburgh

PWM - EDI

PWMEDI

Portland

mié. 3/19

4:11 pm-3:25 pm

2 stops19h 14m

Edinburgh Turnhouse

mié. 3/26

7:25 am-10:57 pm

2 stops19h 32m

$729

PortlandManchester

PWM - MAN

PWMMAN

Portland

jue. 4/3

6:15 am-10:25 am

3 stops23h 10m

Manchester

jue. 4/10

6:05 am-11:27 pm

3 stops22h 22m

$744

Flights are sorted by cheapest round-trip flights first.

Deals found on 2/19

Showing 1-10 of 50 results
1
2
3
...
5

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.

Travel insights for flights from Portland to United Kingdom

Get recent, data-driven insights about flights from Portland to United Kingdom including ideal travel times, pricing trends, and more.

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 $1,136). 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 febrero 20, 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.

Rainfall in United Kingdom by month

Plan your trip to United Kingdom by taking into account the average rainfall totals by month.

In terms of precipitation, rainfall in United Kingdom ranges from 1.6 - 2.8 inches per month. January is typically the wettest month, when rainfall can reach 2.8 in. July is typically the driest time to visit United Kingdom when rainfall is around 1.6 in.

Temperature in United Kingdom by month

Plan your trip to United Kingdom by taking into account the average temperature totals by month.

If weather is an important factor for your trip to United Kingdom, use this chart to help with planning. For those seeking warmer temperatures, July is the ideal time of year to visit, when temperatures reach an average of 62.6 F. Travelers looking to avoid the cold should look outside of January, when temperatures are typically at their lowest (around 39.2 F).

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 febrero 20, 2025.
Read through reviews of airlines operating flights from Portland to United Kingdom, such as Delta, KLM and Austrian Airlines. Users have also rated airlines in terms of entertainment options, comfort, food, crew/service, and boarding process.
Delta
8.0
Very good
8,219 reviews

Food

7.3

Boarding

8.2

Comfort

8.0

Overall

8.0

Crew

8.5

Entertainment

7.9

Reviews

1 / 20

10.0
Excellent

Aaron,Oct 2024

LAX - LHR

This was a flight operated by Virgin Atlantic in their Upper Class cabin. Overall, an outstanding experience.

Delta
8.0
Very good
8,219 reviews
Delta
8.0
Very good
8,219 reviews

Food

7.3

Boarding

8.2

Comfort

8.0

Overall

8.0

Crew

8.5

Entertainment

7.9

Reviews

1 / 20

10.0
Excellent

Aaron,Oct 2024

LAX - LHR

This was a flight operated by Virgin Atlantic in their Upper Class cabin. Overall, an outstanding experience.

KLM
7.8
Good
1,333 reviews
Delta
8.0
Very good
8,219 reviews

Food

7.3

Boarding

8.2

Comfort

8.0

Overall

8.0

Crew

8.5

Entertainment

7.9

Reviews

1 / 20

10.0
Excellent

Aaron,Oct 2024

LAX - LHR

This was a flight operated by Virgin Atlantic in their Upper Class cabin. Overall, an outstanding experience.

Austrian Airlines
7.6
Good
773 reviews
Delta
8.0
Very good
8,219 reviews

Food

7.3

Boarding

8.2

Comfort

8.0

Overall

8.0

Crew

8.5

Entertainment

7.9

Reviews

1 / 20

10.0
Excellent

Aaron,Oct 2024

LAX - LHR

This was a flight operated by Virgin Atlantic in their Upper Class cabin. Overall, an outstanding experience.

Virgin Atlantic
7.5
Good
654 reviews
Delta
8.0
Very good
8,219 reviews

Food

7.3

Boarding

8.2

Comfort

8.0

Overall

8.0

Crew

8.5

Entertainment

7.9

Reviews

1 / 20

10.0
Excellent

Aaron,Oct 2024

LAX - LHR

This was a flight operated by Virgin Atlantic in their Upper Class cabin. Overall, an outstanding experience.

United Airlines
7.4
Good
8,765 reviews
Delta
8.0
Very good
8,219 reviews

Food

7.3

Boarding

8.2

Comfort

8.0

Overall

8.0

Crew

8.5

Entertainment

7.9

Reviews

1 / 20

10.0
Excellent

Aaron,Oct 2024

LAX - LHR

This was a flight operated by Virgin Atlantic in their Upper Class cabin. Overall, an outstanding experience.

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.

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

    For one-way options, check prices for Virgin Atlantic. According to our data, you can fly for as low as $478. Users have also found prices from $490 and $508 on Air Canada and Delta, respectively.

  • 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 $661). Flying from Portland, Maine to United Kingdom in June is currently the most expensive (average of $1,136). 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

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.

Alternative routes for Portland to United Kingdom

See prices for flight routes from nearby airports that may be better suited for you.
Boston to Heathrow flights
Boston to Charles de Gaulle flights
Boston to Dublin flights
Boston to Leonardo da Vinci/Fiumicino flights
Boston to Gatwick flights
Boston to Lisbon flights
Boston to Athens flights
Boston to London City flights
Boston to Amsterdam flights
Boston to Madrid flights
Boston to Barcelona-El Prat flights
Boston to Stansted flights
Boston to Orly flights
Boston to Istanbul flights
Boston to Ponta Delgada flights
Boston to Keflavik Intl flights
Boston to Zurich flights
Boston to Edinburgh flights
Boston to Copenhagen flights
Boston to Malpensa flights
Boston to Munich flights
Boston to Frankfurt flights
Boston to Linate flights
Boston to Shannon flights
Boston to Vicenza flights
Boston to Florence flights
Boston to Porto flights
Boston to Luton flights
Boston to Sabiha Gokcen flights
Boston to Tirana flights
Boston to Vienna flights
Boston to Beauvais-Tille flights
Boston to Berlin flights
Boston to Bruxelles-National flights
Boston to Nice flights
Boston to Geneva flights
Boston to Oslo Gardermoen flights
Boston to Prague flights
Boston to Málaga flights
Boston to Naples flights
Boston to Glasgow Intl flights
Boston to Frederic Chopin flights
Boston to Duesseldorf Intl flights
Boston to Catania flights
Boston to Arlanda flights
Boston to Manchester flights
Boston to Split flights
Boston to Dubrovnik flights
Boston to Sofia flights
Boston to Marseille flights

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 febrero 20, 2025.
AirlineCheapestAverageFlexibilityOn-time
JetBlueCheapest$586Average$749FlexibilityNo cancel feeOn-time62%
DeltaCheapest$638Average$1,009FlexibilityNo cancel feeOn-timeN/A
KLMCheapest$680Average$940FlexibilityNo cancel feeOn-time75%
American AirlinesCheapest$708Average$1,004FlexibilityNo cancel feeOn-time71%
United AirlinesCheapest$725Average$1,103FlexibilityNo cancel feeOn-time69%
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.