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Cheap flights from London Heathrow Airport to Portland, Maine from £374

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 15/9. Fares are subject to change and may not be available on all flights or dates of travel.
LHR — PWM
1 Aug — 8 Aug1
1 adult
1 adult, Economy, 0 bags

Cheap flight deals from Heathrow to Portland

Enter your travel dates to find the best prices.

Cheapest flights from Heathrow to Portland
Explore the most affordable flight options available from Heathrow to Portland. Find the lowest fares from popular airlines and budget airlines, with prices last updated on 2 July 2026.

Thu 10/911:55
LHR
-
PWM
1 stop16h 57m
JetBlue
Mon 14/906:00
PWM
-
LHR
1 stop9h 45m
JetBlue
Deal found 28/6£568
Mon 28/908:15
LHR
-
PWM
1 stop20h 37m
JetBlue
Mon 5/1006:00
PWM
-
LHR
1 stop22h 30m
JetBlue
Deal found 30/6£586
Tue 6/1011:55
LHR
-
PWM
1 stop16h 57m
JetBlue
Fri 9/1006:00
PWM
-
LHR
1 stop22h 30m
JetBlue
Deal found 30/6£621
Sun 23/808:15
LHR
-
PWM
1 stop21h 10m
JetBlue
Sun 30/806:00
PWM
-
LHR
1 stop9h 45m
JetBlue
Deal found 29/6£641
Tue 6/1013:05
LHR
-
PWM
2 stops15h 47m
Icelandair
Fri 9/1006:00
PWM
-
LHR
2 stops33h 20m
Icelandair
Deal found 30/6£651
Mon 27/711:55
LHR
-
PWM
1 stop29h 35m
JetBlue
Mon 3/806:00
PWM
-
LHR
1 stop9h 45m
JetBlue
Deal found 29/6£660
Wed 8/711:55
LHR
-
PWM
1 stop17h 21m
JetBlue
Mon 13/706:00
PWM
-
LHR
1 stop22h 30m
JetBlue
Deal found 29/6£667
Mon 28/912:10
LHR
-
PWM
2 stops16h 18m
United Airlines
Mon 5/1014:32
PWM
-
LHR
2 stops13h 48m
United Airlines
Deal found 30/6£673
Thu 16/708:15
LHR
-
PWM
1 stop21h 01m
JetBlue
Sun 26/706:00
PWM
-
LHR
1 stop22h 30m
JetBlue
Deal found 29/6£677

Find flight deals from Heathrow to Portland

Discover tips and strategies to find the most affordable flight options for your journey from Heathrow (LHR) to Portland (PWM). 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 2 July 2026.

Round-trip from

£568

One-way from

£374

Popular in

August

Cheapest in

May

Average price

£743
JetBlue
  • JetBlue
  • 10/9-14/9
  • 2 total stops
  • 26h 42m total
  • London to Portland
Search Deals
JetBlue
  • JetBlue
  • 15/9
  • 1 total stop
  • 20h 37m total
  • London to Portland
Search Deals
Highest demand for flights based on searches. 18% potential increase in price (£120 potential increase over avg. return price).
Search Deals
Cheapest flight prices on average. 6% potential price decrease (£30 potential savings vs. average return price).
Search Deals
Average for round-trip flights in July 2026
Search Deals

Cheapflights Fare Finder

 
Customise your flight search to find flights from Heathrow to Portland 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 2 July 2026.
Use the filters below to find and compare flights from London Heathrow Airport to Portland that are best for you.

Fly from

Fly to

Route

Depart

Return

Price

Cheapest return flight
Fastest return journey

LondonPortland

LHR - PWM

LHRPWM

London Heathrow

Thu 10/9

11:55-23:52

1 stop16h 57m

Portland

Mon 14/9

06:00-20:45

1 stop9h 45m

£568

LondonPortland

LHR - PWM

LHRPWM

London Heathrow

Tue 6/10

13:05-23:52

2 stops15h 47m

Portland

Fri 9/10

06:00-20:20

2 stops33h 20m

£651

LondonPortland

LHR - PWM

LHRPWM

London Heathrow

Mon 27/7

11:55-12:30

1 stop29h 35m

Portland

Mon 3/8

06:00-20:45

1 stop9h 45m

£660

LondonPortland

LHR - PWM

LHRPWM

London Heathrow

Mon 28/9

12:10-23:28

2 stops16h 18m

Portland

Mon 5/10

14:32-09:20

2 stops13h 48m

£673

LondonPortland

LHR - PWM

LHRPWM

London Heathrow

Thu 10/9

07:30-18:29

2 stops15h 59m

Portland

Mon 14/9

14:38-09:20

2 stops13h 42m

£697

LondonPortland

LHR - PWM

LHRPWM

London Heathrow

Mon 13/7

09:55-23:14

2 stops18h 19m

Portland

Mon 20/7

18:59-13:15

1 stop13h 16m

£755
Cheapest one-way

LondonPortland

LHR - PWM

LHRPWM

London Heathrow

Tue 15/9

10:50-10:28

2 stops28h 38m

£435

LondonPortland

LHR - PWM

LHRPWM

London Heathrow

Sat 10/10

21:25-23:52

2 stops31h 27m

£452

LondonPortland

LHR - PWM

LHRPWM

London Heathrow

Sat 10/10

08:00-23:52

2 stops20h 52m

£471

LondonPortland

LHR - PWM

LHRPWM

London Heathrow

Sat 10/10

11:20-23:52

2 stops17h 32m

£483

Flights are sorted by cheapest return flights first.

Deals found on 29/6

Showing 1-10 of 14 resultsSorted by cheapest first
1
2

Best time to book a flight from Heathrow to Portland

Have a flexible travel schedule? Discover the best time to fly to Portland from Heathrow 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 London Heathrow Airport to Portland

What’s the top stopover airport for flights from London Heathrow Airport to Portland, Maine?

Share of one-stop return flights from London Heathrow Airport to Portland, Maine chosen by Cheapflights users in the past 12 months, using the same stopover each way.

Newark (EWR) – chosen by Cheapflights users on 40% of one-stop itineraries from London Heathrow Airport to Portland, Maine on Cheapflights.

What’s the cheapest stopover airport for flights from London Heathrow Airport to Portland, Maine?

Average return fare for one-stop flights from London Heathrow Airport to Portland, Maine, chosen by Cheapflights users in the past 12 months, with the same stopover each way.

Atlanta (ATL) is the most affordable one-stop option, with an average return flight price of £479.

What’s the fastest stopover option from London Heathrow Airport to Portland, Maine?

Shortest average travel time for one-stop one-way flights from London Heathrow Airport to Portland, Maine, based on itineraries clicked by Cheapflights users over the past 12 months, grouped by stopover airport.

Flights via Newark (EWR) have the shortest average one-way travel time for one-stop routes: 11h 30m.

Which airport typically offers the quickest stopover for flights from London Heathrow Airport to Portland, Maine?

Average stopover duration for one-stop one-way flights from London Heathrow Airport to Portland, Maine, chosen by Cheapflights users in the last 12 months, grouped by stopover airport.

Flights via Newark (EWR) offer the fastest connection on this route, with an average stopover time of 1h 33m.

Reviews of airlines servicing Portland

Get insights into the airlines that provide service to Portland. 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 Portland. Reviews last updated 2 July 2026.
Check out reviews from past customers who have flown with United Airlines from London Heathrow Airport to Portland to help guide your decision. You can also see how each airline stacks up in terms of entertainment options, comfort, food, crew/service, and boarding process.
United Airlines
7.4
Good
9,926 reviews
Check prices

Comfort

7.3

Entertainment

7.1

Overall

7.4

Boarding

7.7

Crew

8.1

Food

6.6

Reviews

1 / 20
6.0
Good

ROHIT,Jun 2026

IND - EWR

It should not be delayed by 2 hours. I missed the important event due to this
United Airlines
7.4
Good
9,926 reviews
United Airlines
7.4
Good
9,926 reviews
Check prices

Comfort

7.3

Entertainment

7.1

Overall

7.4

Boarding

7.7

Crew

8.1

Food

6.6

Reviews

1 / 20
6.0
Good

ROHIT,Jun 2026

IND - EWR

It should not be delayed by 2 hours. I missed the important event due to this

Related info for your journey

Find useful and relevant information for your journey from Heathrow to Portland. 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 into for flights to Portland from London Heathrow?

    Located just 2.9 mi from the city center, Portland is the airport most travelers will use when flying to Portland from London Heathrow. Booking flights from London Heathrow to Portland (PWM) should be relatively easy as there are 0 daily inbound flights from London Heathrow from 1 airline.

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

    JetBlue, Icelandair, and United Airlines can get you from London Heathrow Airport to Portland, Maine in just under 15h 47m. Your travel time can differ by up to 1h 10m. The distance from London Heathrow Airport to Portland, Maine is about 3173 mi. This flight may include one or multiple stops.

  • What is the cheapest airline to fly from London Heathrow Airport to Portland, Maine round-trip?

    According to our current data, United Airlines (£550), offers the cheapest pricing from London Heathrow Airport to Portland, Maine. Users have found that United Airlines is 19% cheaper than the other options available to this destination.

  • Can I find deals for flights from Heathrow to Portland that include hotel bookings?

    Yes. In addition to deals on Heathrow to Portland flights, Cheapflights offers holiday packages that include both flights and hotel.

  • How can I find direct flights from Heathrow to Portland?

    After entering your origin and destination, apply the non-stop filter on the search result page to find direct flights from Heathrow to Portland.

  • Can I find deals for business class flights from Heathrow to Portland?

    Yes. Cheapflights offers flight deals from Heathrow to Portland by cabin class. In addition to browsing deals, you can also filter by cabin class on the search results page after making a search.

See more FAQs

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Alternative routes for Heathrow to Portland

See prices for flight routes from nearby airports that may be better suited for you.
Heathrow to Boston flights
Gatwick to Boston flights
London City to Boston flights
Stansted to Boston flights
Luton to Boston flights
Southend to Boston flights
Heathrow to Bangor flights

Top airline flying from Heathrow to Portland

Discover the top airline that operate flights from Heathrow to Portland. 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 858,174 searches. Data last updated 2 July 2026.
AirlineCheapestAverageFlexibilityOn-time
United AirlinesCheapest£550Average£746FlexibilityNo cancel feeOn-time69%
Search United Airlines flights

Fly with Cheapflights

Find the best flight deals on Cheapflights, where travellers can enjoy low prices and a wide availability of flights to their desired destinations.

How does Cheapflights help users find flights from Heathrow to Portland?

900+ travel sites are searched through when a user searches for a flight using Cheapflights. From the search interface, users can use filters to choose airlines, airports, flight times, cabin classes and more to their preference. Book your flight to Portland from Heathrow today with Cheapflights!

Why should you use Cheapflights to find cheap flight tickets from Heathrow to Portland?

By finding flights from multiple airlines and providers at completely no cost, Cheapflights helps millions of users like you annually find the best flights to Portland from Heathrow.

Can Cheapflights find flights from Heathrow to Portland with no change fees?

Certainly. Search results for flights to Portland from Heathrow shown to you on Cheapflights can be narrowed down with different useful search filters, which includes flexible booking options.

Can Cheapflights notify me if prices for flights from Heathrow to Portland become cheaper?

Not ready to book yet? You can track prices for flights from Heathrow to Portland on Cheapflights with our Price Alert feature and get notified when better prices are available.

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