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Cheap flights from Portland, Maine to London Heathrow Airport from £217

PWM — LHR
24 Nov — 1 Dec1
1 adult
1 adult, Economy, 0 bags

Cheap flight deals from Portland to Heathrow

Enter your travel dates to find the best prices.

Cheapest flights from Portland to Heathrow

Mon 16/1115:41 -
2 stops19h 39m
Wed 18/1109:00 -
2 stops43h 21m
Deal found 21/10£572
Tue 10/1105:30 -
2 stops20h 40m
Wed 11/1112:05 -
2 stops16h 16m
Deal found 22/10£575
Tue 10/1109:46 -
2 stops16h 24m
Thu 12/1106:00 -
3 stops22h 21m
Deal found 23/10£581
Tue 10/1108:49 -
3 stops16h 41m
Thu 12/1106:00 -
3 stops22h 21m
Deal found 23/10£587
Tue 10/1115:41 -
2 stops14h 34m
Thu 12/1109:10 -
2 stops17h 41m
Deal found 23/10£593
Sat 7/1106:30 -
1 stop10h 10m
Sat 14/1108:05 -
1 stop20h 38m
Deal found 22/10£619
Tue 10/1106:30 -
1 stop10h 10m
Wed 11/1107:25 -
1 stop21h 18m
Deal found 22/10£620
Mon 16/1106:30 -
1 stop10h 10m
Wed 18/1112:20 -
1 stop16h 23m
Deal found 20/10£623
Sat 7/1113:10 -
1 stop13h 35m
Sat 14/1106:30 -
2 stops22h 49m
Deal found 22/10£647

Find flight deals from Portland to Heathrow

Round-trip from

£572

One-way from

£252

Popular in

June

Cheapest in

March

Average price

£891
United Airlines
  • United Airlines
  • 16/11-18/11
  • 4 total stops
  • 63h 00m total
  • Portland to London
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Air Canada
  • Air Canada
  • 18/11-31/12
  • 2 total stops
  • 17h 21m total
  • Portland to London
Search Deals
Highest demand for flights based on searches. 19% potential increase in price (£155 potential increase over avg. return price).
Search Deals
Cheapest flight prices on average. 9% potential price decrease (£56 potential savings vs. average return price).
Search Deals
Average for round-trip flights in October 2026
Search Deals

Cheapflights Fare Finder

 
Use the filters below to find and compare flights from Portland to London Heathrow Airport that are best for you.

Fly from

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Route

Depart

Return

Price

Cheapest return flight
Fastest return journey

PortlandLondon

PWM Portland - LHR London Heathrow

PWMLHR

Portland

Mon 7/12

10:55-07:00

2 stops15h 05m

London Heathrow

Wed 31/12

00:00-18:00

Nonstop0h 00m

£253

PortlandLondon

PWM Portland - LHR London Heathrow

PWMLHR

Portland

Mon 23/11

14:05-11:40

1 stop16h 35m

London Heathrow

Wed 31/12

00:00-18:00

Nonstop0h 00m

£256

PortlandLondon

PWM Portland - LHR London Heathrow

PWMLHR

Portland

Wed 18/11

06:00-07:05

2 stops20h 05m

London Heathrow

Wed 31/12

00:00-18:00

Nonstop0h 00m

£259

PortlandLondon

PWM Portland - LHR London Heathrow

PWMLHR

Portland

Mon 23/11

05:30-05:55

2 stops19h 25m

London Heathrow

Wed 31/12

00:00-18:00

Nonstop0h 00m

£259

PortlandLondon

PWM Portland - LHR London Heathrow

PWMLHR

Portland

Tue 24/11

10:50-12:00

2 stops20h 10m

London Heathrow

Wed 31/12

00:00-18:00

Nonstop0h 00m

£259

PortlandLondon

PWM Portland - LHR London Heathrow

PWMLHR

Portland

Mon 23/11

08:49-06:30

3 stops16h 41m

London Heathrow

Wed 31/12

00:00-18:00

Nonstop0h 00m

£266

PortlandLondon

PWM Portland - LHR London Heathrow

PWMLHR

Portland

Tue 24/11

08:49-06:30

3 stops16h 41m

London Heathrow

Wed 31/12

00:00-18:00

Nonstop0h 00m

£268

PortlandLondon

PWM Portland - LHR London Heathrow

PWMLHR

Portland

Wed 18/11

08:49-07:10

3 stops17h 21m

London Heathrow

Wed 31/12

00:00-18:00

Nonstop0h 00m

£295

PortlandLondon

PWM Portland - LHR London Heathrow

PWMLHR

Portland

Sun 1/11

15:40-21:00

2 stops48h 20m

London Heathrow

Wed 31/12

00:00-18:00

Nonstop0h 00m

£316

PortlandLondon

PWM Portland - LHR London Heathrow

PWMLHR

Portland

Mon 16/11

15:41-16:20

2 stops19h 39m

London Heathrow

Wed 18/11

09:00-23:21

2 stops43h 21m

£572

Flights are sorted by cheapest return flights first.

Deals found on 23/10

Showing 1-10 of 16 resultsSorted by cheapest first
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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

Related info for your journey

  • 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.

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

    For as low as £619, United Airlines can have you in London Heathrow Airport from Portland, Maine in 10h 10m. The distance from Portland, Maine to London Heathrow Airport is about 3173 mi. This flight may include one or multiple stops.

  • 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.

See more FAQs

Travelling to a place near London Heathrow Airport?

Book flights to London Heathrow Airport if you plan to visit one of these locations
Hounslow
Luton
Milton Keynes
Slough
Gatwick
Wembley
Hayes
Ilford
Croydon
Northampton
Colchester
Barnet
Eastbourne
Brentford
Southend-on-Sea
Enfield
Southall
Watford
Stratford-upon-Avon
Kingston upon Thames

Browse thousands of different options on Cheapflights for your next trip

Alternative routes for Portland to Heathrow

Boston to Heathrow flights
Boston to Gatwick flights
Boston to London City flights
Boston to Stansted flights
Boston to Luton flights
Boston to Southend flights
Bangor to Heathrow flights

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

Deals for Portland to Heathrow flights are sourced from 900+ travel sites when you use Cheapflights. When all flight results come back, Cheapflights lets you sort and filter flights using different criteria to choose better, like price, airport, cabin class, and plenty of other options.

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

It’s simple! Cheapflights, which is free to use for everyone, saves millions of users time and money every year by helping them find the cheapest and most suitable flights from Portland to Heathrow.

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