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Heathrow

$524+ Cheap flights from Portland, ME (PWM) to Heathrow (LHR)

This is the cheapest round-trip flight price found by a Cheapflights user in the last 72 hours by searching for a flight departing on 9/24. Fares are subject to change and may not be available on all flights or dates of travel.
PWM — LHR
oct. 17 — oct. 241
vie. 10/17
vie. 10/24
1 adult, Economy
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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 septiembre 17, 2025.

Round-trip from

$524
(Virgin Atlantic)

Popular in

June

Cheapest in

May

Average price

$981
From Portland to London Heathrow
Search Deals
Highest demand for flights based on searches. 14% potential increase in price ($157 potential increase over avg. RT price).
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Cheapest flight prices on average. 5% potential price decrease ($47 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 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 septiembre 17, 2025.

This Virgin Atlantic deal was found by Cheapflights users on 9/15. 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 Virgin Atlantic is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
mié. 11/121:25 pmPWM - LHR
1 stop13h 25mVirgin Atlantic
jue. 11/209:00 amLHR - PWM
2 stops18h 19mVirgin Atlantic
Deal found 9/15$524
This Delta deal was found by Cheapflights users on 9/17. 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. 11/116:00 amPWM - LHR
1 stop19h 25mDelta
vie. 11/216:20 amLHR - PWM
2 stops22h 34mDelta
Deal found 9/17$525
This Delta deal was found by Cheapflights users on 9/17. 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. 11/102:30 pmPWM - LHR
1 stop12h 35mDelta
mar. 11/1810:00 amLHR - PWM
2 stops18h 54mDelta
Deal found 9/17$526
This Delta deal was found by Cheapflights users on 9/15. 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.
mié. 9/245:00 pmPWM - LHR
2 stops15h 30mDelta
mar. 9/309:00 amLHR - PWM
2 stops20h 34mDelta
Deal found 9/15$528
This Delta deal was found by Cheapflights users on 9/15. 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. 11/1112:48 pmPWM - LHR
2 stops15h 32mDelta
mié. 11/1911:30 amLHR - PWM
2 stops17h 24mDelta
Deal found 9/15$529
This Delta deal was found by Cheapflights users on 9/15. 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. 11/1112:48 pmPWM - LHR
2 stops15h 32mDelta
jue. 11/2011:45 amLHR - PWM
2 stops17h 09mDelta
Deal found 9/15$530
This KLM deal was found by Cheapflights users on 9/15. 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.
mar. 11/114:53 pmPWM - LHR
1 stop10h 52mKLM
vie. 11/218:55 amLHR - PWM
1 stop18h 24mKLM
Deal found 9/15$532
This Delta deal was found by Cheapflights users on 9/17. 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. 11/102:30 pmPWM - LHR
1 stop10h 50mDelta
jue. 11/202:30 pmLHR - PWM
1 stop14h 24mDelta
Deal found 9/17$533
This Delta deal was found by Cheapflights users on 9/14. 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.
mié. 10/152:38 pmPWM - LHR
2 stops15h 07mDelta
vie. 10/246:30 amLHR - PWM
2 stops22h 35mDelta
Deal found 9/14$557
This Delta deal was found by Cheapflights users on 9/15. 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. 10/301:27 pmPWM - LHR
1 stop12h 58mDelta
jue. 11/66:20 amLHR - PWM
2 stops22h 45mDelta
Deal found 9/15$574
This Delta deal was found by Cheapflights users on 9/17. 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.
vie. 11/141:25 pmPWM - LHR
1 stop13h 25mDelta
mar. 11/189:00 amLHR - PWM
2 stops19h 54mDelta
Deal found 9/17$575

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 septiembre 17, 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

mié. 11/12

1:25 pm-7:50 am

1 stop13h 25m

London Heathrow

mié. 11/19

11:30 am-11:54 pm

2 stops17h 24m

$524

PortlandLondon

PWM - LHR

PWMLHR

Portland

mié. 11/12

1:25 pm-7:50 am

1 stop13h 25m

London Heathrow

jue. 11/20

9:00 am-10:19 pm

2 stops18h 19m

$524

PortlandLondon

PWM - LHR

PWMLHR

Portland

mar. 11/11

2:30 pm-9:35 am

1 stop14h 05m

London Heathrow

mié. 11/19

8:55 am-10:19 pm

2 stops18h 24m

$524

PortlandLondon

PWM - LHR

PWMLHR

Portland

lun. 11/10

6:35 am-10:15 am

1 stop22h 40m

London Heathrow

mié. 11/19

9:00 am-11:54 pm

2 stops19h 54m

$525

PortlandLondon

PWM - LHR

PWMLHR

Portland

lun. 11/10

2:30 pm-10:15 am

1 stop14h 45m

London Heathrow

jue. 11/20

6:20 am-11:54 pm

2 stops22h 34m

$525

PortlandLondon

PWM - LHR

PWMLHR

Portland

mié. 11/12

2:30 pm-8:05 am

1 stop12h 35m

London Heathrow

vie. 11/21

11:45 am-11:54 pm

2 stops17h 09m

$525

PortlandLondon

PWM - LHR

PWMLHR

Portland

lun. 11/10

2:30 pm-10:15 am

1 stop14h 45m

London Heathrow

vie. 11/21

6:20 am-11:54 pm

2 stops22h 34m

$525

PortlandLondon

PWM - LHR

PWMLHR

Portland

mié. 10/15

2:38 pm-11:25 am

1 stop15h 47m

London Heathrow

vie. 10/24

6:30 am-12:05 am

2 stops22h 35m

$525

PortlandLondon

PWM - LHR

PWMLHR

Portland

mar. 11/11

12:48 pm-9:20 am

2 stops15h 32m

London Heathrow

vie. 11/21

11:45 am-11:54 pm

2 stops17h 09m

$530

PortlandLondon

PWM - LHR

PWMLHR

Portland

vie. 11/21

6:00 am-9:20 pm

1 stop10h 20m

$564

Flights are sorted by cheapest round-trip flights first.

Deals found on 9/16

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 $1,097). 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 septiembre 17, 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 septiembre 17, 2025.
Read through reviews of airlines operating flights from Portland to London Heathrow Airport, 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
8.0
Very good
7,961 reviews

Overall

8.0

Comfort

7.9

Crew

8.5

Food

7.3

Boarding

8.2

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
7,961 reviews
Delta
8.0
Very good
7,961 reviews

Overall

8.0

Comfort

7.9

Crew

8.5

Food

7.3

Boarding

8.2

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
8,926 reviews
Delta
8.0
Very good
7,961 reviews

Overall

8.0

Comfort

7.9

Crew

8.5

Food

7.3

Boarding

8.2

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
2,914 reviews
Delta
8.0
Very good
7,961 reviews

Overall

8.0

Comfort

7.9

Crew

8.5

Food

7.3

Boarding

8.2

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 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.

  • How long is the flight from Portland, Maine to London Heathrow Airport?

    There are many flights that can get you from Portland, Maine to London Heathrow Airport in 13h 25m. Fly via Delta or Virgin Atlantic to get the fastest option. There are 3173 mi between Portland, Maine and London Heathrow Airport.

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

    JetBlue, at $586, was found to be the cheapest airline from Portland, Maine to London Heathrow Airport.Alternate airlines to your destination round-trip include United Airlines and Delta. These flights start at 37% lower than the current average price 3 months from now.

  • 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 $1,097). 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 London Heathrow Airport?

Book flights to London Heathrow Airport if you plan to visit one of these locations
Hounslow
Hayes
Southend-on-Sea
Harrow
Canterbury
Croydon
Eastleigh
Dartford
Dover
Winchester
Orpington
Northampton
Gatwick
Borehamwood
Broadway
Aylesbury
Bedford
Wembley
Folkestone
Chichester

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 septiembre 17, 2025.
AirlineCheapestAverageFlexibilityOn-time
JetBlueCheapest$586Average$678FlexibilityNo cancel feeOn-time62%
United AirlinesCheapest$648Average$853FlexibilityNo cancel feeOn-time69%
DeltaCheapest$825Average$963FlexibilityNo cancel feeOn-timeN/A

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