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Cheap flights from Portland, Maine to London Heathrow Airport from £483

This is the cheapest retur flight price found by a Cheapflights user in the last 72 hours by searching for a flight departing on 9/9. Fares are subject to change and may not be available on all flights or dates of travel.
PWM — LHR
20 Aug — 27 Aug1
1 adult

Cheap 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 15 August 2025.

Round-trip from

£483

Popular in

June

Cheapest in

April

Average price

£663
JetBlue
  • JetBlue
  • 9/9-12/9
  • 2 total stops
  • 33h 05m total
  • Portland to London
Search Deals
Highest demand for flights based on searches. 15% potential increase in price (£96 potential increase over avg. return price).
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Cheapest flight prices on average. 5% potential price decrease (£26 potential savings vs. average return price).
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Average for round-trip flights in August 2025
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Find flight deals from Portland to Heathrow

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 15 August 2025.

Tue 9/914:17PWM - LHR
1 stop14h 13mJetBlue
Fri 12/908:15LHR - PWM
1 stop18h 52mJetBlue
Deal found 13/8£483
Tue 9/906:31PWM - LHR
2 stops27h 04mScandinavian Airlines
Fri 12/906:40LHR - PWM
3 stops22h 54mScandinavian Airlines
Deal found 13/8£515
Sat 27/914:17PWM - LHR
1 stop14h 13mJetBlue
Sat 4/1008:15LHR - PWM
1 stop18h 47mJetBlue
Deal found 13/8£516
Wed 10/914:36PWM - LHR
2 stops20h 24mScandinavian Airlines
Wed 17/906:40LHR - PWM
2 stops22h 54mScandinavian Airlines
Deal found 14/8£521
Wed 17/906:33PWM - LHR
2 stops28h 27mScandinavian Airlines
Mon 29/907:05LHR - PWM
2 stops22h 29mScandinavian Airlines
Deal found 14/8£532
Wed 17/914:17PWM - LHR
1 stop25h 28mJetBlue
Mon 29/911:55LHR - PWM
1 stop15h 12mJetBlue
Deal found 14/8£535
Wed 10/915:11PWM - LHR
1 stop13h 09mUnited Airlines
Wed 17/909:30LHR - PWM
2 stops32h 52mUnited Airlines
Deal found 14/8£536
Wed 10/908:02PWM - LHR
1 stop17h 38mAmerican Airlines
Wed 17/911:05LHR - PWM
1 stop16h 38mAmerican Airlines
Deal found 14/8£553
Sun 7/906:14PWM - LHR
1 stop19h 06mUnited Airlines
Sun 14/907:30LHR - PWM
2 stops15h 56mUnited Airlines
Deal found 14/8£581

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 15 August 2025.
Use the filters below to find and compare flights from Portland to London Heathrow Airport that are best for you.

Fly from

Portland

Fly to

Heathrow

Route

Depart

Return

Price

PortlandLondon

PWM - LHR

PWMLHR

Portland

Tue 9/9

14:17-09:30

1 stop14h 13m

London Heathrow

Fri 12/9

08:15-22:07

1 stop18h 52m

£483

PortlandLondon

PWM - LHR

PWMLHR

Portland

Tue 9/9

06:31-14:35

2 stops27h 04m

London Heathrow

Fri 12/9

06:40-00:34

3 stops22h 54m

£515

PortlandLondon

PWM - LHR

PWMLHR

Portland

Sat 27/9

14:17-09:30

1 stop14h 13m

London Heathrow

Sat 4/10

08:15-22:02

1 stop18h 47m

£516

PortlandLondon

PWM - LHR

PWMLHR

Portland

Wed 10/9

14:36-16:00

2 stops20h 24m

London Heathrow

Wed 17/9

06:40-00:34

2 stops22h 54m

£521

PortlandLondon

PWM - LHR

PWMLHR

Portland

Tue 10/2

14:35-17:00

3 stops21h 25m

London Heathrow

Tue 17/2

06:40-23:49

2 stops22h 09m

£527

PortlandLondon

PWM - LHR

PWMLHR

Portland

Wed 17/9

06:33-16:00

2 stops28h 27m

London Heathrow

Mon 29/9

07:05-00:34

2 stops22h 29m

£532

PortlandLondon

PWM - LHR

PWMLHR

Portland

Wed 17/9

14:17-20:45

1 stop25h 28m

London Heathrow

Mon 29/9

11:55-22:07

1 stop15h 12m

£535

PortlandLondon

PWM - LHR

PWMLHR

Portland

Wed 10/9

15:11-09:20

1 stop13h 09m

London Heathrow

Wed 17/9

09:30-13:22

2 stops32h 52m

£536

PortlandLondon

PWM - LHR

PWMLHR

Portland

Tue 10/2

06:00-07:10

2 stops20h 10m

London Heathrow

Tue 17/2

13:25-23:17

2 stops38h 52m

£536

Flights are sorted by cheapest return flights first.

Deals found on 13/8

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 is the cheapest month to book a flight from Portland, Maine to London Heathrow Airport?

Currently, January is the cheapest month in which you can book a flight from Portland, Maine to London Heathrow Airport (average of £112). Flying from Portland, Maine to London Heathrow Airport in August is currently the most expensive (average of £164). There are several factors that can impact the price of a flight, so comparing airlines, departure airports and flight times can provide users with more options.

How much does it cost for a return flight from Portland, Maine 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.

New York (JFK) – chosen by Cheapflights users on 50% 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 £541.

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 47m.

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.

  • 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.

  • What is the cheapest month to book a flight from Portland, Maine to London Heathrow Airport?

    Currently, January is the cheapest month in which you can book a flight from Portland, Maine to London Heathrow Airport (average of £112). Flying from Portland, Maine to London Heathrow Airport in August is currently the most expensive (average of £164). There are several factors that can impact the price of a flight, so comparing airlines, departure airports and flight times can provide users with more options.

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
Croydon
Hounslow
Gatwick
Slough
Northampton
Deal
Luton
Wembley
Crawley
Ilford
Hayes
Ipswich
Southend-on-Sea
Winchester
Folkestone
Eastbourne
Maidstone
Watford
Chichester

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

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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.

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.

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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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