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Cheap flights from Portland, Maine to London Heathrow Airport from £237

PWM — LHR
14 Oct — 21 Oct1
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

Tue 10/1106:00 -
1 stop19h 20m
Tue 17/1108:55 -
2 stops20h 24m
Deal found 11/9£547
Wed 4/1116:15 -
1 stop13h 15m
Thu 12/1111:45 -
2 stops17h 34m
Deal found 11/9£548
Wed 7/1016:47 -
2 stops14h 18m
Wed 14/1008:55 -
2 stops20h 15m
Deal found 13/9£551
Mon 16/1108:49 -
1 stop19h 21m
Wed 18/1106:50 -
2 stops21h 31m
Deal found 13/9£552
Tue 10/1114:05 -
1 stop13h 55m
Tue 17/1115:50 -
1 stop13h 29m
Deal found 10/9£553
Tue 10/1108:49 -
1 stop18h 36m
Thu 12/1106:50 -
2 stops17h 12m
Deal found 10/9£562
Mon 9/1117:08 -
1 stop33h 47m
Thu 12/1106:50 -
2 stops17h 12m
Deal found 10/9£567
Mon 5/1011:50 -
2 stops14h 50m
Tue 20/1011:45 -
2 stops17h 25m
Deal found 10/9£570

Find flight deals from Portland to Heathrow

Round-trip from

£547

One-way from

£237

Popular in

June

Cheapest in

February

Average price

£747
Delta
  • Delta
  • 10/11-24/11
  • 3 total stops
  • 39h 49m total
  • Portland to London
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JetBlue
  • JetBlue
  • 14/10-31/12
  • 1 total stop
  • 9h 45m total
  • Portland to London
Search Deals
Highest demand for flights based on searches. 22% potential increase in price (£182 potential increase over avg. return price).
Search Deals
Cheapest flight prices on average. 11% potential price decrease (£64 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 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

Thu 5/11

06:30-21:40

1 stop10h 10m

London Heathrow

Wed 31/12

00:00-18:00

Nonstop0h 00m

£237
Fastest return journey

PortlandLondon

PWM Portland - LHR London Heathrow

PWMLHR

Portland

Fri 16/10

06:00-20:45

1 stop9h 45m

London Heathrow

Wed 31/12

00:00-18:00

Nonstop0h 00m

£244

PortlandLondon

PWM Portland - LHR London Heathrow

PWMLHR

Portland

Sun 14/2

06:00-06:20

1 stop19h 20m

London Heathrow

Wed 31/12

00:00-18:00

Nonstop0h 00m

£244

PortlandLondon

PWM Portland - LHR London Heathrow

PWMLHR

Portland

Sun 14/2

10:57-07:00

2 stops15h 03m

London Heathrow

Wed 31/12

00:00-18:00

Nonstop0h 00m

£244

PortlandLondon

PWM Portland - LHR London Heathrow

PWMLHR

Portland

Fri 16/10

06:04-05:20

2 stops18h 16m

London Heathrow

Wed 31/12

00:00-18:00

Nonstop0h 00m

£247

PortlandLondon

PWM Portland - LHR London Heathrow

PWMLHR

Portland

Thu 5/11

05:50-05:55

2 stops19h 05m

London Heathrow

Wed 31/12

00:00-18:00

Nonstop0h 00m

£247

PortlandLondon

PWM Portland - LHR London Heathrow

PWMLHR

Portland

Tue 13/10

06:28-07:55

2 stops20h 27m

London Heathrow

Wed 31/12

00:00-18:00

Nonstop0h 00m

£247

PortlandLondon

PWM Portland - LHR London Heathrow

PWMLHR

Portland

Sun 14/2

11:17-10:10

3 stops17h 53m

London Heathrow

Wed 31/12

00:00-18:00

Nonstop0h 00m

£463

PortlandLondon

PWM Portland - LHR London Heathrow

PWMLHR

Portland

Tue 10/11

14:05-09:00

1 stop13h 55m

London Heathrow

Tue 24/11

08:55-00:19

2 stops20h 24m

£547

PortlandLondon

PWM Portland - LHR London Heathrow

PWMLHR

Portland

Wed 7/10

16:47-12:05

2 stops14h 18m

London Heathrow

Wed 14/10

08:55-00:10

2 stops20h 15m

£551

Flights are sorted by cheapest return flights first.

Deals found on 11/9

Showing 1-10 of 17 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

Cheapflights Insights

Everything you need to know about your flight from Portland to London Heathrow Airport

How much does it cost for a return flight from Portland, Maine to London Heathrow Airport?

Airfare is below average for this route at the moment.

Portland, Maine to London Heathrow Airport flights typically cost between £688 and £868 in November.
The cheapest return price found within the last 5 days was £547 on Delta (10 Nov–24 Nov).

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 £552, Delta can have you in London Heathrow Airport from Portland, Maine in 19h 21m. 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
Gatwick
Wembley
Slough
Ilford
Hayes
Northampton
Croydon
Colchester
Eastbourne
Brentford
Enfield
Southend-on-Sea
Barnet
Southall
Watford
Swindon
Kingston upon Thames

Browse thousands of different options on Cheapflights for your next trip

Alternative routes for Portland to Heathrow

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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

Fly with Cheapflights

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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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Yes! Cheapflights helps users easily find flights from Portland to Heathrow with no change fees.

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