Cheap flights from Portland, Maine to London Heathrow Airport from £384
This is the cheapest retur flight price found by a Cheapflights user in the last 72 hours by searching for a flight departing on 12/11. Fares are subject to change and may not be available on all flights or dates of travel.
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 17 September 2025.
Round-trip from | £384 |
---|---|
Popular in | June |
Cheapest in | May |
Average price | £719 |
Find flight deals from Portland to Heathrow
Cheapest flights from Portland to HeathrowExplore 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 17 September 2025.
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 17 September 2025.
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
PortlandLondon
PWM - LHR
PWMLHR
Portland
Wed 12/11
13:25-07:50
1 stop13h 25m
London Heathrow
Wed 19/11
11:30-23:54
2 stops17h 24m
PortlandLondon
PWM - LHR
PWMLHR
Portland
Wed 12/11
13:25-07:50
1 stop13h 25m
London Heathrow
Thu 20/11
09:00-22:19
2 stops18h 19m
PortlandLondon
PWM - LHR
PWMLHR
Portland
Tue 11/11
14:30-09:35
1 stop14h 05m
London Heathrow
Wed 19/11
08:55-22:19
2 stops18h 24m
PortlandLondon
PWM - LHR
PWMLHR
Portland
Tue 11/11
06:00-06:25
1 stop19h 25m
London Heathrow
Fri 21/11
06:20-23:54
2 stops22h 34m
PortlandLondon
PWM - LHR
PWMLHR
Portland
Mon 10/11
06:35-10:15
1 stop22h 40m
London Heathrow
Wed 19/11
09:00-23:54
2 stops19h 54m
PortlandLondon
PWM - LHR
PWMLHR
Portland
Mon 10/11
14:30-10:15
1 stop14h 45m
London Heathrow
Thu 20/11
06:20-23:54
2 stops22h 34m
PortlandLondon
PWM - LHR
PWMLHR
Portland
Wed 12/11
14:30-08:05
1 stop12h 35m
London Heathrow
Fri 21/11
11:45-23:54
2 stops17h 09m
PortlandLondon
PWM - LHR
PWMLHR
Portland
Mon 10/11
14:30-10:15
1 stop14h 45m
London Heathrow
Fri 21/11
06:20-23:54
2 stops22h 34m
PortlandLondon
PWM - LHR
PWMLHR
Portland
Wed 15/10
14:38-11:25
1 stop15h 47m
London Heathrow
Fri 24/10
06:30-00:05
2 stops22h 35m
PortlandLondon
PWM - LHR
PWMLHR
Portland
Fri 21/11
06:00-21:20
1 stop10h 20m
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.
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?
Newark (EWR) – chosen by Cheapflights users on 40% of one-stop itineraries from Portland, Maine to London Heathrow Airport on Cheapflights.
What’s the fastest stopover option from Portland, Maine to London Heathrow Airport?
Flights via Newark (EWR) have the shortest average one-way travel time for one-stop routes: 9h 40m.
What’s the fastest stopover option from Portland, Maine to London Heathrow 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?
Flights via Newark (EWR) offer the fastest connection on this route, with an average stopover time of 1h 35m.
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.
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Alternative routes for Portland to Heathrow
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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.
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!