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Cheap flights from Portland, Maine to London Heathrow Airport from £218

PWM — LHR
28 Nov — 5 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 stops14h 34m
Wed 18/1109:00 -
2 stops43h 21m
Deal found 24/10£576
Tue 10/1109:46 -
2 stops16h 24m
Thu 12/1106:00 -
3 stops22h 21m
Deal found 26/10£585
Tue 10/1108:49 -
3 stops17h 21m
Thu 12/1106:00 -
3 stops22h 21m
Deal found 26/10£591
Tue 10/1115:41 -
2 stops14h 34m
Thu 12/1109:10 -
2 stops14h 52m
Deal found 26/10£597
Tue 10/1106:30 -
1 stop10h 10m
Thu 12/1112:20 -
1 stop16h 23m
Deal found 26/10£624
Mon 16/1106:30 -
1 stop10h 10m
Wed 18/1112:20 -
1 stop16h 23m
Deal found 27/10£628
Fri 27/1108:49 -
2 stops31h 11m
Fri 4/1209:00 -
2 stops39h 25m
Deal found 28/10£636
Thu 5/1106:30 -
1 stop10h 10m
Wed 18/1107:25 -
1 stop21h 18m
Deal found 26/10£637

Find flight deals from Portland to Heathrow

Round-trip from

£576

One-way from

£218

Popular in

June

Cheapest in

March

Average price

£896
United Airlines
  • United Airlines
  • 16/11-18/11
  • 4 total stops
  • 57h 55m total
  • Portland to London
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JetBlue
  • JetBlue
  • 17/11-31/12
  • 1 total stop
  • 10h 10m total
  • Portland to London
Search Deals
Highest demand for flights based on searches. 19% potential increase in price (£157 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
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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

Fly to

Route

Depart

Return

Price

Cheapest return flight

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

£257

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

£261
Fastest return journey

PortlandLondon

PWM Portland - LHR London Heathrow

PWMLHR

Portland

Mon 23/11

14:05-09:00

1 stop13h 55m

London Heathrow

Wed 31/12

00:00-18:00

Nonstop0h 00m

£261

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

£261

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

£268

PortlandLondon

PWM Portland - LHR London Heathrow

PWMLHR

Portland

Sun 15/11

09:46-06:40

1 stop15h 54m

London Heathrow

Mon 23/11

09:00-23:21

2 stops19h 21m

£654

PortlandLondon

PWM Portland - LHR London Heathrow

PWMLHR

Portland

Wed 25/11

05:50-07:10

2 stops20h 20m

London Heathrow

Sat 12/12

12:05-23:24

2 stops16h 19m

£660

PortlandLondon

PWM Portland - LHR London Heathrow

PWMLHR

Portland

Fri 15/1

06:00-07:55

2 stops20h 55m

London Heathrow

Thu 21/1

06:30-23:55

2 stops22h 25m

£670

PortlandLondon

PWM Portland - LHR London Heathrow

PWMLHR

Portland

Thu 10/12

12:49-07:45

1 stop13h 56m

London Heathrow

Mon 14/12

11:35-00:21

1 stop17h 46m

£674

PortlandLondon

PWM Portland - LHR London Heathrow

PWMLHR

Portland

Tue 29/12

16:28-05:55

1 stop32h 27m

London Heathrow

Tue 12/1

13:35-14:44

1 stop30h 09m

£678

Flights are sorted by cheapest return flights first.

Deals found on 25/10

Showing 1-10 of 16 resultsSorted by cheapest first
1
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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 £674, United Airlines can have you in London Heathrow Airport from Portland, Maine in 13h 56m. 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
Wembley
Gatwick
Ilford
Hayes
Croydon
Northampton
Barnet
Eastbourne
Brentford
Southend-on-Sea
Southall
Enfield
Watford
Kingston upon Thames
Dagenham
Dover

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
Bangor to Heathrow flights
Boston to Southend flights

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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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