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Cheap flights from Portland, Maine to London Heathrow Airport from £235

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 27/7. Fares are subject to change and may not be available on all flights or dates of travel.
PWM — LHR
17 Jun — 24 Jun1
1 adult

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 12 June 2025.

Round-trip from

£518

One-way from

£235

Popular in

June

Cheapest in

April

Average price

£1,074
Scandinavian Airlines
  • Scandinavian Airlines
  • 5/9-15/9
  • 4 total stops
  • 67h 15m total
  • Portland to London
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JetBlue
  • JetBlue
  • 27/7
  • 1 total stop
  • 9h 40m total
  • Portland to London
Search Deals
Highest demand for flights based on searches. 13% potential increase in price (£80 potential increase over avg. return price).
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Cheapest flight prices on average. 5% potential price decrease (£26 potential savings vs. average return price).
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Average for round-trip flights in June 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 12 June 2025.

Fri 5/906:31PWM - LHR
2 stops45h 49mScandinavian Airlines
Mon 15/907:05LHR - PWM
2 stops21h 26mScandinavian Airlines
Deal found 12/6£518
Fri 5/914:17PWM - LHR
1 stop14h 13mJetBlue
Mon 15/911:55LHR - PWM
1 stop15h 07mJetBlue
Deal found 12/6£530
Tue 12/816:56PWM - LHR
1 stop13h 49mUnited Airlines
Wed 20/807:25LHR - PWM
2 stops20h 36mUnited Airlines
Deal found 11/6£542
Tue 12/812:53PWM - LHR
2 stops15h 22mDelta
Wed 20/809:00LHR - PWM
2 stops20h 03mDelta
Deal found 11/6£550
Fri 10/1008:00PWM - LHR
2 stops17h 30mAir Canada
Tue 14/1014:05LHR - PWM
2 stops28h 39mAir Canada
Deal found 12/6£573
Fri 10/1017:11PWM - LHR
1 stop12h 54mMultiple Airlines
Tue 14/1008:25LHR - PWM
1 stop11h 30mMultiple Airlines
Deal found 12/6£589
Thu 9/1016:55PWM - LHR
1 stop11h 00mAir France
Wed 15/1013:05LHR - PWM
1 stop15h 58mAir France
Deal found 11/6£589
Thu 9/1016:55PWM - LHR
1 stop11h 00mKLM
Mon 13/1010:55LHR - PWM
1 stop17h 36mKLM
Deal found 12/6£626
Thu 12/614:19PWM - LHR
2 stops27h 06mTurkish Airlines
Mon 16/606:30LHR - PWM
2 stops22h 22mTurkish Airlines
Deal found 12/6£860

Cheapflights Fare Finder

Customise 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 858,174 searches. Data last updated 12 June 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

Fri 5/9

06:31-09:20

2 stops45h 49m

London Heathrow

Mon 15/9

07:05-23:31

2 stops21h 26m

£518

PortlandLondon

PWM - LHR

PWMLHR

Portland

Fri 5/9

14:17-09:30

1 stop14h 13m

London Heathrow

Mon 15/9

11:55-22:02

1 stop15h 07m

£530

PortlandLondon

PWM - LHR

PWMLHR

Portland

Tue 12/8

16:56-11:45

1 stop13h 49m

London Heathrow

Wed 20/8

07:25-23:01

2 stops20h 36m

£542

PortlandLondon

PWM - LHR

PWMLHR

Portland

Tue 12/8

12:53-09:15

2 stops15h 22m

London Heathrow

Wed 20/8

09:00-00:03

2 stops20h 03m

£550

PortlandLondon

PWM - LHR

PWMLHR

Portland

Fri 10/10

08:00-06:30

2 stops17h 30m

London Heathrow

Tue 14/10

14:05-13:44

2 stops28h 39m

£573

PortlandLondon

PWM - LHR

PWMLHR

Portland

Fri 10/10

17:11-11:05

1 stop12h 54m

London Heathrow

Tue 14/10

08:25-14:55

1 stop11h 30m

£589

PortlandLondon

PWM - LHR

PWMLHR

Portland

Thu 9/10

16:55-08:55

1 stop11h 00m

London Heathrow

Wed 15/10

13:05-00:03

1 stop15h 58m

£589

PortlandLondon

PWM - LHR

PWMLHR

Portland

Thu 9/10

16:55-08:55

1 stop11h 00m

London Heathrow

Mon 13/10

10:55-23:31

1 stop17h 36m

£626

PortlandLondon

PWM - LHR

PWMLHR

Portland

Sun 27/7

06:05-20:45

1 stop9h 40m

£235

PortlandLondon

PWM - LHR

PWMLHR

Portland

Sun 27/7

15:17-11:55

2 stops15h 38m

£297

Flights are sorted by cheapest return flights first.

Deals found on 12/6

Showing 1-10 of 11 results
1
2

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 return 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, January is the cheapest month in which you can book a flight from Portland, Maine to London Heathrow Airport (average of £112). Flying from Portland, Maine to London Heathrow Airport in August is currently the most expensive (average of £164). 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.

Rainfall in Heathrow by month

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

In terms of precipitation, rainfall in London Heathrow Airport ranges from 40.0 - 70.0 inches per month. January is typically the wettest month, when rainfall can reach 70.0 mm. July is typically the driest time to visit London Heathrow Airport when rainfall is around 40.0 mm.

Temperature in Heathrow by month

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

If weather is an important factor for your trip to London Heathrow Airport, 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 17.0 C. Travellers hoping to avoid the cold should look outside of January, when temperatures are typically at their lowest (around 4.0 C).

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 12 June 2025.
See what other customers who have flown with Delta, KLM and Air France from Portland to London have to say. Users have also rated airlines in terms of entertainment options, comfort, food, crew/service, and boarding process.
Delta
8.0
Very Good
7,950 reviews
Check prices

Boarding

8.2

Overall

8.0

Comfort

7.9

Crew

8.5

Food

7.3

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
7,950 reviews
Delta
8.0
Very Good
7,950 reviews
Check prices

Boarding

8.2

Overall

8.0

Comfort

7.9

Crew

8.5

Food

7.3

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!
KLM
7.8
Good
1,358 reviews
Delta
8.0
Very Good
7,950 reviews
Check prices

Boarding

8.2

Overall

8.0

Comfort

7.9

Crew

8.5

Food

7.3

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!
Air France
7.5
Good
1,463 reviews
Delta
8.0
Very Good
7,950 reviews
Check prices

Boarding

8.2

Overall

8.0

Comfort

7.9

Crew

8.5

Food

7.3

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
8,790 reviews
Delta
8.0
Very Good
7,950 reviews
Check prices

Boarding

8.2

Overall

8.0

Comfort

7.9

Crew

8.5

Food

7.3

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
7.3
Good
2,925 reviews
Delta
8.0
Very Good
7,950 reviews
Check prices

Boarding

8.2

Overall

8.0

Comfort

7.9

Crew

8.5

Food

7.3

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?

    For a flight from Portland to London Heathrow, you will be flying from Portland. Portland (PWM) is just 2.9 mi from the center of the city. Portland is the only Portland airport and it handles 0 outbound flights to London Heathrow per day. 0 airlines have flights to London Heathrow from Portland on a regular basis.

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

    Flying on Scandinavian Airlines is currently your cheapest option to London Heathrow Airport, with prices starting at £518. Additional return tickets that might be worth considering are offered by JetBlue and United Airlines, with the lowest prices starting at £530 and £542, respectively. Users have found that Scandinavian Airlines is 25% cheaper than the other options available to this destination.

  • 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 holiday 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, January is the cheapest month in which you can book a flight from Portland, Maine to London Heathrow Airport (average of £112). Flying from Portland, Maine to London Heathrow Airport in August is currently the most expensive (average of £164). 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

Travelling to a place near Portland?

Book flights to Portland if you plan to visit one of these locations
Deal
Hounslow
Croydon
Milton Keynes
Northampton
Gatwick
Luton
Slough
Wembley
Crawley
Eastbourne
Ilford
Southend-on-Sea
Watford
Hayes
Ipswich
Winchester
Folkestone
Maidstone
Swindon

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Alternative routes for Portland to Heathrow

See prices for flight routes from nearby airports that may be better suited for you.
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