Find flights
When to book
FAQs

Cheap flights from London Heathrow Airport to Portland, Maine from £398

LHR — PWM
29 Sep — 6 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

Mon 28/915:20 -
1 stop13h 08m
Tue 24/1115:41 -
1 stop12h 29m
Deal found 29/8£555
Thu 1/1016:00 -
1 stop12h 28m
Tue 24/1105:50 -
1 stop9h 45m
Deal found 29/8£578
Tue 13/1007:05 -
2 stops22h 05m
Tue 20/1006:04 -
3 stops28h 56m
Deal found 28/8£580
Thu 1/1007:45 -
1 stop11h 06m
Sat 21/1115:41 -
1 stop13h 44m
Deal found 29/8£600
Thu 3/1219:30 -
2 stops33h 51m
Sun 6/1206:00 -
2 stops22h 20m
Deal found 29/8£601
Sun 27/908:15 -
1 stop20h 39m
Sun 4/1006:00 -
1 stop22h 30m
Deal found 30/8£608
Fri 11/907:05 -
2 stops21h 51m
Fri 25/906:02 -
3 stops22h 18m
Deal found 27/8£622
Sat 26/908:15 -
1 stop20h 39m
Sat 3/1006:00 -
1 stop9h 45m
Deal found 29/8£637

Find flight deals from Heathrow to Portland

Round-trip from

£555

One-way from

£398

Popular in

September

Cheapest in

November

Average price

£965
United Airlines
  • United Airlines
  • 28/9-18/11
  • 2 total stops
  • 22h 58m total
  • London to Portland
Search Deals
30/11
  • 30/11
  • 2 total stops
  • 41h 33m total
  • London to Portland
Search Deals
Highest demand for flights based on searches. 27% potential increase in price (£210 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 August 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

LondonPortland

LHR London Heathrow - PWM Portland

LHRPWM

London Heathrow

Thu 3/12

19:30-00:21

2 stops33h 51m

Portland

Sun 6/12

06:00-09:20

2 stops22h 20m

£601

LondonPortland

LHR London Heathrow - PWM Portland

LHRPWM

London Heathrow

Thu 15/10

07:05-00:10

2 stops22h 05m

Portland

Wed 21/10

06:04-09:35

2 stops22h 31m

£646

LondonPortland

LHR London Heathrow - PWM Portland

LHRPWM

London Heathrow

Sat 10/10

06:50-18:12

2 stops16h 22m

Portland

Sat 17/10

10:43-05:55

1 stop14h 12m

£699

LondonPortland

LHR London Heathrow - PWM Portland

LHRPWM

London Heathrow

Wed 7/10

12:10-23:28

2 stops16h 18m

Portland

Wed 14/10

15:41-10:40

2 stops13h 59m

£703
Fastest return journey

LondonPortland

LHR London Heathrow - PWM Portland

LHRPWM

London Heathrow

Thu 3/12

12:00-23:24

1 stop16h 24m

Portland

Sun 6/12

06:00-21:20

1 stop10h 20m

£707

LondonPortland

LHR London Heathrow - PWM Portland

LHRPWM

London Heathrow

Sun 27/9

17:55-18:43

2 stops29h 48m

Portland

Sun 4/10

19:25-20:40

2 stops20h 15m

£739

LondonPortland

LHR London Heathrow - PWM Portland

LHRPWM

London Heathrow

Tue 15/9

13:50-23:32

2 stops14h 42m

Portland

Mon 28/9

10:43-05:55

1 stop14h 12m

£742
Cheapest one-way

LondonPortland

LHR London Heathrow - PWM Portland

LHRPWM

London Heathrow

Mon 30/11

20:35-09:08

2 stops41h 33m

£398

LondonPortland

LHR London Heathrow - PWM Portland

LHRPWM

London Heathrow

Sat 10/10

08:15-23:54

1 stop20h 39m

£434

LondonPortland

LHR London Heathrow - PWM Portland

LHRPWM

London Heathrow

Wed 9/9

19:50-15:55

3 stops49h 05m

£467

Flights are sorted by cheapest return flights first.

Deals found on 29/8

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

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 71% 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 £557.

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: 11h 10m.

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 27m.

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 16h 22m. Your travel time can differ by up to 5h 43m. 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
London City to Boston flights
Gatwick to Boston flights
Stansted to Boston flights
Luton to Boston flights
Heathrow to Bangor flights
Southend to Boston 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.

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.