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Cheap flights from Portland, Maine to London Heathrow Airport from £244

This is the cheapest one-way flight price found by a Cheapflights user in the last 72 hours by searching for a flight departing on 20/10. Fares are subject to change and may not be available on all flights or dates of travel.
PWM — LHR
30 May — 6 Jun1
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
Explore the most affordable flight options available from Portland to Heathrow. Find the lowest fares from popular airlines and budget airlines, with prices last updated on 30 April 2026.

Tue 10/1114:35
PWM
-
LHR
1 stop12h 30m
Delta
Tue 24/1110:00
LHR
-
PWM
2 stops18h 49m
Delta
Deal found 27/4£540
Wed 6/512:46
PWM
-
LHR
2 stops15h 04m
Delta
Mon 11/508:55
LHR
-
PWM
2 stops20h 48m
Delta
Deal found 26/4£543
Tue 10/1113:35
PWM
-
LHR
1 stop13h 15m
KLM
Tue 17/1108:55
LHR
-
PWM
1 stop18h 28m
KLM
Deal found 27/4£545
Sun 1/1112:50
PWM
-
LHR
2 stops15h 30m
Delta
Sun 8/1108:55
LHR
-
PWM
1 stop18h 28m
Delta
Deal found 27/4£548
Wed 14/1006:00
PWM
-
LHR
1 stop19h 25m
Virgin Atlantic
Wed 21/1006:15
LHR
-
PWM
2 stops21h 08m
Virgin Atlantic
Deal found 27/4£579
Sun 1/1111:30
PWM
-
LHR
1 stop14h 35m
KLM
Sun 8/1110:10
LHR
-
PWM
1 stop18h 39m
KLM
Deal found 27/4£583
Wed 9/1206:00
PWM
-
LHR
1 stop19h 25m
Virgin Atlantic
Sun 13/1206:20
LHR
-
PWM
2 stops21h 03m
Virgin Atlantic
Deal found 27/4£606
Tue 1/1206:00
PWM
-
LHR
1 stop19h 25m
Virgin Atlantic
Thu 17/1206:20
LHR
-
PWM
2 stops21h 03m
Virgin Atlantic
Deal found 26/4£637
Tue 10/1110:00
PWM
-
LHR
3 stops18h 20m
Scandinavian Airlines
Tue 17/1106:40
LHR
-
PWM
2 stops22h 09m
Scandinavian Airlines
Deal found 25/4£656
Tue 10/1117:06
PWM
-
LHR
1 stop11h 04m
United Airlines
Tue 24/1106:50
LHR
-
PWM
2 stops16h 23m
United Airlines
Deal found 28/4£659
Sun 10/507:20
PWM
-
LHR
1 stop21h 10m
JetBlue
Sat 16/508:15
LHR
-
PWM
1 stop19h 48m
JetBlue
Deal found 29/4£664
Tue 27/1015:15
PWM
-
LHR
2 stops18h 50m
Austrian Airlines
Mon 2/1119:25
LHR
-
PWM
2 stops27h 48m
Austrian Airlines
Deal found 29/4£665

Find flight deals from Portland to Heathrow

Discover tips and strategies to find the most affordable flight options for your journey from Portland (PWM) to Heathrow (LHR). Learn about various techniques such as flexible date searches, comparing prices across and setting up price alerts. Use these methods to find the cheapest flights available for your travel needs. Data last updated 30 April 2026.

Round-trip from

£540

One-way from

£244

Popular in

July

Cheapest in

October

Average price

£634
Delta
  • Delta
  • 10/5-16/5
  • 3 total stops
  • 40h 28m total
  • Portland to London
Search Deals
20/10
  • 20/10
  • 1 total stop
  • 12h 01m total
  • Portland to London
Search Deals
Highest demand for flights based on searches. 22% potential increase in price (£132 potential increase over avg. return price).
Search Deals
Cheapest flight prices on average. 6% potential price decrease (£30 potential savings vs. average return price).
Search Deals
Average for round-trip flights in April 2026
Search Deals

Cheapflights Fare Finder

 
Customise your flight search to find flights from Portland to Heathrow that fit within your specific budget. Explore options based on user searches and filter the results based on your desired price range. Find flights that match your budget for a cost-effective journey. Over the last 7 days, Cheapflights users made 858,174 searches. Data last updated 30 April 2026.
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 - LHR

PWMLHR

Portland

Sun 25/10

06:00-09:00

1 stop23h 00m

London Heathrow

Thu 5/11

06:20-22:23

2 stops21h 03m

£540

PortlandLondon

PWM - LHR

PWMLHR

Portland

Wed 13/5

12:50-07:10

1 stop13h 20m

London Heathrow

Wed 20/5

09:20-23:12

1 stop18h 52m

£545

PortlandLondon

PWM - LHR

PWMLHR

Portland

Mon 31/8

14:35-08:50

1 stop13h 15m

London Heathrow

Sat 5/9

11:20-23:59

1 stop17h 39m

£676

PortlandLondon

PWM - LHR

PWMLHR

Portland

Sun 10/5

14:38-06:45

1 stop11h 07m

London Heathrow

Sat 16/5

08:40-23:09

2 stops19h 29m

£687

PortlandLondon

PWM - LHR

PWMLHR

Portland

Thu 25/6

14:59-10:30

2 stops14h 31m

London Heathrow

Mon 29/6

06:15-00:52

2 stops23h 37m

£710

PortlandLondon

PWM - LHR

PWMLHR

Portland

Tue 7/7

14:59-10:20

1 stop14h 21m

London Heathrow

Tue 14/7

12:50-00:59

1 stop17h 09m

£756

PortlandLondon

PWM - LHR

PWMLHR

Portland

Mon 31/8

09:10-06:30

3 stops16h 20m

London Heathrow

Sat 5/9

08:30-23:31

3 stops20h 01m

£770
Fastest return journey

PortlandLondon

PWM - LHR

PWMLHR

Portland

Sat 4/7

06:00-20:40

1 stop9h 40m

London Heathrow

Fri 10/7

16:40-23:51

1 stop12h 11m

£810
Cheapest one-way

PortlandLondon

PWM - LHR

PWMLHR

Portland

Tue 20/10

11:01-07:50

1 stop15h 49m

£244

PortlandLondon

PWM - LHR

PWMLHR

Portland

Tue 27/10

09:10-06:40

2 stops17h 30m

£252

Flights are sorted by cheapest return flights first.

Deals found on 28/4

Showing 1-10 of 17 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
Rates are based on past data. Find the cheapest month and day to book your flight based on your travel requirements, then search for cheap deals.

Cheapflights Insights

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

What’s the top stopover airport for flights from Portland, Maine to London Heathrow Airport?

Share of one-stop return flights from Portland, Maine to London Heathrow Airport chosen by Cheapflights users in the past 12 months, using the same stopover each way.

Newark (EWR) – chosen by Cheapflights users on 33% of one-stop itineraries from Portland, Maine to London Heathrow Airport on Cheapflights.

What’s the cheapest stopover airport for flights from Portland, Maine to London Heathrow Airport?

Average return fare for one-stop flights from Portland, Maine to London Heathrow Airport, chosen by Cheapflights users in the past 12 months, with the same stopover each way.

New York (JFK) is the most affordable one-stop option, with an average return flight price of £426.

What’s the fastest stopover option from Portland, Maine to London Heathrow Airport?

Shortest average travel time for one-stop one-way flights from Portland, Maine to London Heathrow Airport, based on itineraries clicked by Cheapflights users over the past 12 months, grouped by stopover airport.

Flights via Newark (EWR) have the shortest average one-way travel time for one-stop routes: 9h 40m.

Which airport typically offers the quickest stopover for flights from Portland, Maine to London Heathrow Airport?

Average stopover duration for one-stop one-way flights from Portland, Maine to London Heathrow Airport, chosen by Cheapflights users in the last 12 months, grouped by stopover airport.

Flights via Newark (EWR) offer the fastest connection on this route, with an average stopover time of 1h 24m.

Related info for your journey

Find useful and relevant information for your journey from Portland to Heathrow. Access travel guides, tips, and recommendations to enhance your travel experience. Get information about local attractions, weather, transportation options, and more.

  • 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 £687, KLM can have you in London Heathrow Airport from Portland, Maine in 11h 07m. 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
Milton Keynes
Wembley
Croydon
Northampton
Hounslow
Luton
Gatwick
Ilford
Slough
Hayes
Brentford
Colchester
Romford
Watford
Kingston upon Thames
Eastbourne
Swindon
Ipswich
Southend-on-Sea
Guildford

Browse thousands of different options on Cheapflights for your next trip

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Alternative routes for Portland to Heathrow

See prices for flight routes from nearby airports that may be better suited for you.
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Fly with Cheapflights

Find the best flight deals on Cheapflights, where travellers can enjoy low prices and a wide availability of flights to their desired destinations.

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.

Can Cheapflights find flights from Portland to Heathrow with no change fees?

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

Can Cheapflights notify me if prices for flights from Portland to Heathrow become cheaper?

Yes, and it’s super simple to set up. Click the bell icon next to the flight deals above and provide a valid email address to enable Price Alerts. That’s it!

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