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Cheap flights from Portland, Maine to London Heathrow Airport from £224

PWM — LHR
3 Dec — 10 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 16/1108:49 -
1 stop19h 21m
Wed 18/1106:50 -
2 stops21h 31m
Deal found 2/11£575
Thu 12/1106:30 -
1 stop10h 10m
Wed 18/1112:20 -
1 stop16h 23m
Deal found 2/11£578
Sun 15/1117:08 -
1 stop33h 47m
Wed 18/1106:50 -
2 stops21h 31m
Deal found 1/11£579
Sun 15/1106:30 -
1 stop22h 00m
Wed 18/1107:25 -
1 stop21h 18m
Deal found 1/11£582
Thu 12/1106:30 -
1 stop10h 10m
Tue 17/1112:20 -
1 stop16h 23m
Deal found 29/10£621
Mon 16/1106:30 -
1 stop10h 10m
Wed 18/1112:20 -
1 stop16h 23m
Deal found 1/11£622
Fri 13/1106:30 -
1 stop22h 00m
Wed 18/1112:20 -
1 stop16h 23m
Deal found 29/10£628
Thu 26/1106:00 -
1 stop20h 50m
Thu 3/1211:45 -
2 stops17h 36m
Deal found 29/10£646
Thu 12/1105:50 -
1 stop10h 30m
Wed 18/1112:05 -
2 stops16h 16m
Deal found 2/11£652
Thu 19/1105:50 -
1 stop9h 45m
Fri 27/1112:05 -
2 stops16h 16m
Deal found 3/11£652
Thu 3/1209:38 -
1 stop20h 12m
Sun 6/1206:50 -
2 stops17h 22m
Deal found 3/11£653

Find flight deals from Portland to Heathrow

Round-trip from

£575

One-way from

£224

Popular in

June

Cheapest in

March

Average price

£696
United Airlines
  • United Airlines
  • 16/11-18/11
  • 3 total stops
  • 40h 52m total
  • Portland to London
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JetBlue
  • JetBlue
  • 15/11-31/12
  • 1 total stop
  • 22h 00m 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 (£55 potential savings vs. average return price).
Search Deals
Average for round-trip flights in November 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

Sun 15/11

06:30-09:30

1 stop22h 00m

London Heathrow

Wed 31/12

00:00-18:00

Nonstop0h 00m

£224

PortlandLondon

PWM Portland - LHR London Heathrow

PWMLHR

Portland

Fri 26/3

06:00-21:20

1 stop11h 20m

London Heathrow

Wed 31/12

00:00-18:00

Nonstop0h 00m

£249

PortlandLondon

PWM Portland - LHR London Heathrow

PWMLHR

Portland

Fri 26/3

14:34-06:35

2 stops12h 01m

London Heathrow

Wed 31/12

00:00-18:00

Nonstop0h 00m

£249

PortlandLondon

PWM Portland - LHR London Heathrow

PWMLHR

Portland

Tue 13/4

15:15-08:20

1 stop12h 05m

London Heathrow

Wed 31/12

00:00-18:00

Nonstop0h 00m

£249

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
Fastest return journey

PortlandLondon

PWM Portland - LHR London Heathrow

PWMLHR

Portland

Thu 19/11

05:50-20:35

1 stop9h 45m

London Heathrow

Wed 31/12

00:00-18:00

Nonstop0h 00m

£259

PortlandLondon

PWM Portland - LHR London Heathrow

PWMLHR

Portland

Thu 10/12

14:15-10:50

1 stop15h 35m

London Heathrow

Wed 31/12

00:00-18:00

Nonstop0h 00m

£259

PortlandLondon

PWM Portland - LHR London Heathrow

PWMLHR

Portland

Sun 15/11

17:08-07:55

1 stop33h 47m

London Heathrow

Wed 18/11

06:50-19:02

2 stops17h 12m

£579

PortlandLondon

PWM Portland - LHR London Heathrow

PWMLHR

Portland

Mon 16/11

15:41-11:15

2 stops14h 34m

London Heathrow

Wed 18/11

08:00-19:02

2 stops16h 02m

£595

PortlandLondon

PWM Portland - LHR London Heathrow

PWMLHR

Portland

Thu 26/11

06:00-07:50

1 stop20h 50m

London Heathrow

Thu 3/12

11:45-00:21

2 stops17h 36m

£646

Flights are sorted by cheapest return flights first.

Deals found on 30/10

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

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 £579, United Airlines can have you in London Heathrow Airport from Portland, Maine in 33h 47m. The distance from Portland, Maine to London Heathrow Airport is about 3173 mi.

  • 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
Wembley
Gatwick
Slough
Ilford
Hayes
Croydon
Eastbourne
Northampton
Barnet
Brentford
Southend-on-Sea
Enfield
Southall
Harrow
Watford
Folkestone
Dagenham

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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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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