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Cheap flights from London Heathrow Airport to Portland, Maine from £397

LHR — PWM
12 Oct — 19 Oct1
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

Thu 3/1206:40 -
2 stops22h 41m
Sun 6/1206:00 -
2 stops31h 30m
Deal found 10/9£622
Sat 10/1008:15 -
1 stop20h 39m
Sat 17/1006:00 -
1 stop9h 45m
Deal found 12/9£671
Tue 20/1011:20 -
2 stops17h 34m
Mon 26/1005:50 -
2 stops21h 20m
Deal found 8/9£702
Thu 15/1008:00 -
2 stops20h 54m
Mon 19/1006:00 -
2 stops19h 35m
Deal found 10/9£710
Mon 26/1009:00 -
2 stops18h 59m
Mon 2/1119:35 -
2 stops20h 00m
Deal found 11/9£738
Mon 23/1106:30 -
2 stops22h 01m
Fri 27/1106:00 -
2 stops20h 10m
Deal found 10/9£746
Tue 20/1012:10 -
2 stops16h 18m
Mon 26/1005:50 -
1 stop10h 45m
Deal found 8/9£754
Thu 3/1207:30 -
2 stops16h 55m
Sun 6/1216:37 -
1 stop32h 18m
Deal found 11/9£758
Thu 15/1013:50 -
2 stops14h 38m
Mon 19/1014:32 -
1 stop11h 23m
Deal found 10/9£769

Find flight deals from Heathrow to Portland

Round-trip from

£622

One-way from

£397

Popular in

September

Cheapest in

November

Average price

£1,556
Scandinavian Airlines
  • Scandinavian Airlines
  • 3/12-6/12
  • 4 total stops
  • 54h 11m total
  • London to Portland
Search Deals
10/11-31/12
  • 10/11-31/12
  • 2 total stops
  • 25h 53m total
  • London to Portland
Search Deals
Highest demand for flights based on searches. 27% potential increase in price (£208 potential increase over avg. return price).
Search Deals
Cheapest flight prices on average. 12% potential price decrease (£61 potential savings vs. average return price).
Search Deals
Average for round-trip flights in September 2026
Search Deals

Cheapflights Fare Finder

 
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 London Heathrow - PWM Portland

LHRPWM

London Heathrow

Fri 13/11

12:20-23:43

1 stop16h 23m

Portland

Wed 31/12

00:00-06:00

Nonstop0h 00m

£411

LondonPortland

LHR London Heathrow - PWM Portland

LHRPWM

London Heathrow

Mon 9/11

12:20-23:43

1 stop16h 23m

Portland

Wed 31/12

00:00-06:00

Nonstop0h 00m

£411

LondonPortland

LHR London Heathrow - PWM Portland

LHRPWM

London Heathrow

Sat 14/11

12:20-23:43

1 stop16h 23m

Portland

Wed 31/12

00:00-06:00

Nonstop0h 00m

£411

LondonPortland

LHR London Heathrow - PWM Portland

LHRPWM

London Heathrow

Sat 10/10

08:15-23:54

1 stop20h 39m

Portland

Wed 31/12

00:00-06:00

Nonstop0h 00m

£413

LondonPortland

LHR London Heathrow - PWM Portland

LHRPWM

London Heathrow

Thu 26/11

15:40-11:56

1 stop25h 16m

Portland

Wed 31/12

00:00-06:00

Nonstop0h 00m

£543

LondonPortland

LHR London Heathrow - PWM Portland

LHRPWM

London Heathrow

Fri 4/12

15:40-11:53

1 stop25h 13m

Portland

Wed 31/12

00:00-06:00

Nonstop0h 00m

£544

LondonPortland

LHR London Heathrow - PWM Portland

LHRPWM

London Heathrow

Thu 3/12

15:40-11:53

1 stop25h 13m

Portland

Wed 31/12

00:00-06:00

Nonstop0h 00m

£544

LondonPortland

LHR London Heathrow - PWM Portland

LHRPWM

London Heathrow

Sat 10/10

08:30-09:21

2 stops29h 51m

Portland

Wed 31/12

00:00-06:00

Nonstop0h 00m

£559

LondonPortland

LHR London Heathrow - PWM Portland

LHRPWM

London Heathrow

Thu 3/12

06:40-00:21

2 stops22h 41m

Portland

Sun 6/12

06:00-18:30

2 stops31h 30m

£622

LondonPortland

LHR London Heathrow - PWM Portland

LHRPWM

London Heathrow

Mon 26/10

09:00-23:59

2 stops18h 59m

Portland

Mon 2/11

19:35-20:35

2 stops20h 00m

£738

Flights are sorted by cheapest return flights first.

Deals found on 11/9

Showing 1-10 of 12 resultsSorted by cheapest first
1
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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

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?

Atlanta (ATL) – chosen by Cheapflights users on 83% 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?

Newark (EWR) is the most affordable one-stop option, with an average return flight price of £539.

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

Flights via Newark (EWR) have the shortest average one-way travel time for one-stop routes: 10h 53m.

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

Flights via Newark (EWR) offer the fastest connection on this route, with an average stopover time of 1h 17m.

Related info for your journey

  • 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 0 different airlines.

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

    Scandinavian Airlines and United Airlines can get you from London Heathrow Airport to Portland, Maine in just under 18h 59m. Your travel time can differ by up to 3h 42m. The distance from London Heathrow Airport to Portland, Maine is about 3173 mi. This flight may include one or multiple stops.

  • 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

Browse thousands of different options on Cheapflights for your next trip

Alternative routes for Heathrow to Portland

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

Fly with Cheapflights

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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