$330+ Cheap flights from Portland, ME (PWM) to Heathrow (LHR)
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 10/20. Fares are subject to change and may not be available on all flights or dates of travel.
PWM — LHR
Jun 3 — Jun 101
Round-trip
1 adult, Economy
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Find cheap flights from Portland to Heathrow with Cheapflights
1. Tell us where you want to go
Enter your travel information like dates, passengers, trip type (one-way or round trip), and preferred cabin class then click “Find deals”2. Select your favorite providers
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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 May 4, 2026.
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 May 4, 2026.
This United Airlines deal was found by Cheapflights users on 5/3. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 9/67:35 pm
PWM
- LHR
1 stop30h 20m
United Airlines
Wed 9/96:50 am
LHR
- PWM
2 stops22h 09m
United Airlines
Deal found 5/3![United Airlines logo]()
$765
This The Travel House deal was found by Cheapflights users on 5/4. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure The Travel House is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 8/276:00 am
PWM
- LHR
2 stops29h 25m
Scandinavian Airlines
Tue 9/13:35 pm
LHR
- PWM
2 stops37h 24m
Scandinavian Airlines
Deal found 5/4![Scandinavian Airlines logo]()
$856
This Orbitz deal was found by Cheapflights users on 5/1. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Orbitz is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 9/166:30 am
PWM
- LHR
2 stops30h 10m
Scandinavian Airlines
Sun 9/2010:20 am
LHR
- PWM
2 stops18h 39m
Scandinavian Airlines
Deal found 5/1![Scandinavian Airlines logo]()
$881
This United Airlines deal was found by Cheapflights users on 5/3. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 8/116:00 am
PWM
- LHR
1 stop10h 25m
United Airlines
Thu 8/276:50 am
LHR
- PWM
2 stops17h 04m
United Airlines
Deal found 5/3![United Airlines logo]()
$884
This United Airlines deal was found by Cheapflights users on 4/30. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 10/16:00 am
PWM
- LHR
1 stop9h 40m
United Airlines
Fri 10/21:50 pm
LHR
- PWM
2 stops14h 37m
United Airlines
Deal found 4/30![United Airlines logo]()
$886
This United Airlines deal was found by Cheapflights users on 5/1. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 11/103:15 pm
PWM
- LHR
1 stop14h 50m
United Airlines
Tue 11/176:50 am
LHR
- PWM
2 stops14h 19m
United Airlines
Deal found 5/1![United Airlines logo]()
$889
This United Airlines deal was found by Cheapflights users on 4/30. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 11/107:22 pm
PWM
- LHR
1 stop10h 28m
United Airlines
Tue 11/246:50 am
LHR
- PWM
2 stops16h 23m
United Airlines
Deal found 4/30![United Airlines logo]()
$890
This United Airlines deal was found by Cheapflights users on 5/1. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 11/42:45 pm
PWM
- LHR
2 stops13h 25m
United Airlines
Wed 11/116:50 am
LHR
- PWM
2 stops14h 19m
United Airlines
Deal found 5/1![United Airlines logo]()
$894
This Cheapflightsfares deal was found by Cheapflights users on 4/29. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Cheapflightsfares is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 5/107:20 am
PWM
- LHR
1 stop21h 10m
JetBlue
Sat 5/168:15 am
LHR
- PWM
1 stop19h 48m
JetBlue
Deal found 4/29![JetBlue logo]()
$896
This Cheapflightsfares deal was found by Cheapflights users on 4/29. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Cheapflightsfares is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 10/273:15 pm
PWM
- LHR
2 stops18h 50m
Austrian Airlines
Mon 11/27:25 pm
LHR
- PWM
2 stops27h 48m
Austrian Airlines
Deal found 4/29![Austrian Airlines logo]()
$897
Best flights from Portland to HeathrowDiscover carefully curated flight deals from Portland to Heathrow that have cost, travel time, and layovers in mind to ensure you get the best travel experience. Data last updated May 4, 2026.
Discover carefully curated flight deals from Portland to Heathrow that have cost, travel time, and layovers in mind to ensure you get the best travel experience. Data last updated May 4, 2026.
This Delta deal was found by Cheapflights users on 4/29. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 10/276:00 am
PWM
- LHR
1 stop20h 25m
Delta
Mon 11/26:30 am
LHR
- PWM
2 stops22h 19m
Delta
Deal found 4/29![Delta logo]()
$927
This Virgin Atlantic deal was found by Cheapflights users on 5/1. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Virgin Atlantic is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 9/161:35 pm
PWM
- LHR
1 stop18h 40m
Virgin Atlantic
Sun 9/206:30 am
LHR
- PWM
2 stops21h 03m
Virgin Atlantic
Deal found 5/1![Virgin Atlantic logo]()
$927
This United Airlines deal was found by Cheapflights users on 5/3. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 8/136:00 am
PWM
- LHR
1 stop10h 20m
United Airlines
Thu 8/276:50 am
LHR
- PWM
2 stops17h 04m
United Airlines
Deal found 5/3![United Airlines logo]()
$934
This British Airways deal was found by Cheapflights users on 5/1. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure British Airways is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 9/161:02 pm
PWM
- LHR
1 stop13h 18m
Multiple Airlines
Mon 9/2110:15 am
LHR
- PWM
1 stop15h 08m
Multiple Airlines
Deal found 5/1![Multiple Airlines logo]()
$949
This Delta deal was found by Cheapflights users on 5/4. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 8/272:53 pm
PWM
- LHR
1 stop10h 27m
Delta
Tue 9/18:40 am
LHR
- PWM
2 stops20h 19m
Delta
Deal found 5/4![Delta logo]()
$927
This British Airways deal was found by Cheapflights users on 5/1. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure British Airways is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 9/165:30 pm
PWM
- LHR
1 stop12h 20m
Multiple Airlines
Sun 9/202:00 pm
LHR
- PWM
1 stop14h 41m
Multiple Airlines
Deal found 5/1![Multiple Airlines logo]()
$949
This Virgin Atlantic deal was found by Cheapflights users on 5/1. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Virgin Atlantic is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 8/126:05 am
PWM
- LHR
1 stop19h 20m
Virgin Atlantic
Wed 8/191:25 pm
LHR
- PWM
1 stop14h 55m
Virgin Atlantic
Deal found 5/1![Virgin Atlantic logo]()
$956
This Air Canada deal was found by Cheapflights users on 4/29. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Air Canada is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 10/2711:17 am
PWM
- LHR
2 stops15h 53m
Multiple Airlines
Mon 11/29:00 am
LHR
- PWM
3 stops18h 57m
Multiple Airlines
Deal found 4/29![Multiple Airlines logo]()
$953
This United Airlines deal was found by Cheapflights users on 4/30. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 7/46:00 am
PWM
- LHR
1 stop10h 25m
United Airlines
Fri 7/104:40 pm
LHR
- PWM
1 stop12h 11m
United Airlines
Deal found 4/30![United Airlines logo]()
$1,094
This Delta deal was found by Cheapflights users on 5/2. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 5/152:38 pm
PWM
- LHR
2 stops15h 07m
Delta
Sun 5/1711:45 am
LHR
- PWM
2 stops17h 58m
Delta
Deal found 5/2![Delta logo]()
$1,007
This Delta deal was found by Cheapflights users on 5/3. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 7/2212:40 pm
PWM
- LHR
1 stop13h 30m
Delta
Fri 8/711:45 am
LHR
- PWM
2 stops18h 14m
Delta
Deal found 5/3![Delta logo]()
$1,033
Last-minute flights from Portland to HeathrowDiscover last-minute flight deals from Portland to Heathrow. Data last updated May 4, 2026 and is based on user searches.
Discover last-minute flight deals from Portland to Heathrow. Data last updated May 4, 2026 and is based on user searches.
This Delta deal was found by Cheapflights users on 5/1. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 5/64:43 pm
PWM
- LHR
2 stops16h 02m
Delta
Mon 5/118:40 am
LHR
- PWM
2 stops19h 29m
Delta
Deal found 5/1![Delta logo]()
$932
This Air Canada deal was found by Cheapflights users on 4/29. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Air Canada is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 5/611:08 am
PWM
- LHR
2 stops14h 22m
Multiple Airlines
Mon 5/118:30 am
LHR
- PWM
3 stops19h 59m
Multiple Airlines
Deal found 4/29![Multiple Airlines logo]()
$968
This Air Canada deal was found by Cheapflights users on 4/29. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Air Canada is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 5/611:08 am
PWM
- LHR
3 stops17h 27m
Air Canada
Mon 5/118:30 am
LHR
- PWM
3 stops19h 59m
Air Canada
Deal found 4/29![Air Canada logo]()
$976
This Delta deal was found by Cheapflights users on 4/29. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 5/86:25 am
PWM
- LHR
1 stop18h 55m
Delta
Wed 5/136:30 am
LHR
- PWM
2 stops21h 42m
Delta
Deal found 4/29![Delta logo]()
$927
This KLM deal was found by Cheapflights users on 4/29. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure KLM is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 5/82:38 pm
PWM
- LHR
1 stop13h 12m
KLM
Wed 5/134:20 pm
LHR
- PWM
1 stop13h 23m
KLM
Deal found 4/29![KLM logo]()
$956
This Air Canada deal was found by Cheapflights users on 4/29. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Air Canada is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 5/811:08 am
PWM
- LHR
3 stops17h 27m
Air Canada
Wed 5/138:30 am
LHR
- PWM
3 stops19h 59m
Air Canada
Deal found 4/29![Air Canada logo]()
$980
This Cheapflightsfares deal was found by Cheapflights users on 4/29. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Cheapflightsfares is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 5/107:20 am
PWM
- LHR
1 stop21h 10m
JetBlue
Sat 5/168:15 am
LHR
- PWM
1 stop19h 48m
JetBlue
Deal found 4/29![JetBlue logo]()
$896
This Delta deal was found by Cheapflights users on 4/30. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 5/104:48 pm
PWM
- LHR
2 stops15h 17m
Delta
Sat 5/168:40 am
LHR
- PWM
2 stops21h 03m
Delta
Deal found 4/30![Delta logo]()
$931
This Delta deal was found by Cheapflights users on 5/2. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 5/152:38 pm
PWM
- LHR
1 stop10h 42m
Delta
Sun 5/178:40 am
LHR
- PWM
2 stops19h 29m
Delta
Deal found 5/2![Delta logo]()
$997
One-way flights from Portland to HeathrowSearch for one-way flight options from Portland to Heathrow. Find affordable one-way fares based on user searches. Data last updated May 4, 2026.
Search for one-way flight options from Portland to Heathrow. Find affordable one-way fares based on user searches. Data last updated May 4, 2026.
This British Airways deal was found by Cheapflights users on 4/29. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure British Airways is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 10/204:04 pm
PWM
- LHR
1 stop12h 01m
Multiple Airlines
Deal found 4/29![Multiple Airlines logo]()
$330
This United Airlines deal was found by Cheapflights users on 5/2. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 8/55:15 am
PWM
- LHR
2 stops22h 05m
United Airlines
Deal found 5/2![United Airlines logo]()
$340
This Air Canada deal was found by Cheapflights users on 4/29. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Air Canada is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 10/207:51 am
PWM
- LHR
3 stops17h 39m
Air Canada
Deal found 4/29![Air Canada logo]()
$352
This British Airways deal was found by Cheapflights users on 4/30. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure British Airways is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 10/13:03 pm
PWM
- LHR
1 stop10h 47m
Multiple Airlines
Deal found 4/30![Multiple Airlines logo]()
$380
This United Airlines deal was found by Cheapflights users on 4/30. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 10/16:00 am
PWM
- LHR
2 stops18h 55m
United Airlines
Deal found 4/30![United Airlines logo]()
$390
This KAYAK deal was found by Cheapflights users on 4/29. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure KAYAK is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 10/207:51 am
PWM
- LHR
2 stops21h 09m
Austrian Airlines
Deal found 4/29![Austrian Airlines logo]()
$393
This Air Canada deal was found by Cheapflights users on 4/30. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Air Canada is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 10/19:10 am
PWM
- LHR
3 stops16h 20m
Air Canada
Deal found 4/30![Air Canada logo]()
$399
This Justfly.com deal was found by Cheapflights users on 5/2. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Justfly.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 7/132:40 pm
PWM
- LHR
1 stop13h 50m
JetBlue
Deal found 5/2![JetBlue logo]()
$478
This Delta deal was found by Cheapflights users on 5/1. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 5/3112:50 pm
PWM
- LHR
1 stop13h 20m
Delta
Deal found 5/1![Delta logo]()
$628
This Air Canada deal was found by Cheapflights users on 5/2. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Air Canada is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 8/59:10 am
PWM
- LHR
3 stops16h 20m
Air Canada
Deal found 5/2![Air Canada logo]()
$673
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 May 4, 2026.
Most accurate provider | Ovago 3 stars |
|---|---|
Most trusted provider | Ovago 3 stars |
Round-trip from | $765 (United Airlines) |
One-way from | $330 (British Airways) |
Popular in | July |
Cheapest in | October |
Average price | $731 |
Cheapflights Fare Finder
Customize 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 2,558,603 searches. Data last updated May 4, 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
Cheapest round-trip
PortlandLondon
PWM - LHR
PWMLHR
Portland
Tue 10/27
6:00 am-6:25 am
1 stop20h 25m
London Heathrow
Mon 11/2
6:30 am-11:49 pm
2 stops22h 19m
$927
PortlandLondon
PWM - LHR
PWMLHR
Portland
Wed 9/16
1:35 pm-1:15 pm
1 stop18h 40m
London Heathrow
Sun 9/20
6:30 am-10:33 pm
2 stops21h 03m
$927
PortlandLondon
PWM - LHR
PWMLHR
Portland
Thu 8/27
2:53 pm-6:20 am
1 stop10h 27m
London Heathrow
Tue 9/1
8:40 am-11:59 pm
2 stops20h 19m
$927
PortlandLondon
PWM - LHR
PWMLHR
Portland
Thu 8/13
6:00 am-9:20 pm
1 stop10h 20m
London Heathrow
Thu 8/27
6:50 am-6:54 pm
2 stops17h 04m
$934
PortlandLondon
PWM - LHR
PWMLHR
Portland
Wed 9/16
1:02 pm-7:20 am
1 stop13h 18m
London Heathrow
Mon 9/21
10:15 am-8:23 pm
1 stop15h 08m
$949
PortlandLondon
PWM - LHR
PWMLHR
Portland
Wed 9/16
5:30 pm-10:50 am
1 stop12h 20m
London Heathrow
Sun 9/20
2:00 pm-11:41 pm
1 stop14h 41m
$949
PortlandLondon
PWM - LHR
PWMLHR
Portland
Tue 10/27
11:17 am-7:10 am
2 stops15h 53m
London Heathrow
Mon 11/2
9:00 am-10:57 pm
3 stops18h 57m
$953
PortlandLondon
PWM - LHR
PWMLHR
Portland
Wed 8/12
6:05 am-6:25 am
1 stop19h 20m
London Heathrow
Wed 8/19
1:25 pm-11:20 pm
1 stop14h 55m
$956
PortlandLondon
PWM - LHR
PWMLHR
Portland
Fri 5/15
2:38 pm-10:45 am
2 stops15h 07m
London Heathrow
Sun 5/17
11:45 am-12:43 am
2 stops17h 58m
$1,007
PortlandLondon
PWM - LHR
PWMLHR
Portland
Wed 7/22
12:40 pm-7:10 am
1 stop13h 30m
London Heathrow
Fri 8/7
11:45 am-12:59 am
2 stops18h 14m
$1,033
Showing 1-10 of 21 resultsSorted by cheapest first
Compare providers for flights from Portland to Heathrow
Provider information is updated monthly. Please note that these providers often have deals for this flight, but the availability may vary on a day-by-day basis on Cheapflights.
Use the table below to compare price accuracy, trust ratings, and cancellation policies for each provider offering flight deals from Portland to Heathrow in May.
| Provider | Price Accuracy | Trust Score* |
|---|---|---|
| Price Accuracy3 stars | Trust Score*3 stars | |
| Price Accuracy3 stars | Trust Score*3 stars |
- Most accurate provider: When it comes to deals on Portland, Maine-London Heathrow Airport flights, users find the pricing of Ovago to be most consistent on Cheapflights vs. Ovago Users can find the same prices on Portland, Maine-London Heathrow Airport flight deals on Cheapflights vs. Ovago >95% of the time. Price accuracy is based on data collected from Portland, Maine-London Heathrow Airport flight searches over the past month and is updated monthly.
- Most trusted provider: When it comes to deals on Portland, Maine-London Heathrow Airport flights, Cheapflights users trust Ovago the most. Ovago has received a user feedback score of 3 out of 3 stars (3 being the best), meaning they have been trusted the most by Cheapflights users looking for Portland, Maine-London Heathrow Airport flight deals. Provider user feedback score is based on Cheapflights searches over the past month and is updated monthly.
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.
PWM-LHR
Estimated round-trip 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.
Reviews of airlines servicing Heathrow
Get insights into the airlines that provide service to Heathrow. Read reviews, discover amenities, and learn about the overall travel experience offered by airlines. Use this information to make informed decisions when choosing an airline for your flight to Heathrow. Reviews last updated May 4, 2026.
Read through reviews of airlines operating flights from Portland to London Heathrow Airport, such as United Airlines. Reviews also offer insight into each airline's entertainment options, comfort, food, crew/service, and boarding process.
Boarding
7.7
Entertainment
7.1
Comfort
7.3
Overall
7.4
Food
6.6
Crew
8.1
Reviews
1 / 20
8.0
ExcellentAnonymous,Apr 2026
DFW - EWR
Boarding
7.7
Entertainment
7.1
Comfort
7.3
Overall
7.4
Food
6.6
Crew
8.1
Reviews
1 / 20
8.0
ExcellentAnonymous,Apr 2026
DFW - EWR
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.
Traveling to a place near London Heathrow Airport?
Book flights to London Heathrow Airport if you plan to visit one of these locationsIlford
Hounslow
Winchester
Croydon
Gatwick
Southend-on-Sea
Harrow
Eastleigh
Dartford
Dover
Orpington
Watford
Northampton
Borehamwood
Broadway
Chipping Norton
Hayes
Kingston upon Thames
Eastbourne
Slough
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Top airline flying from Portland to Heathrow
Discover the top airline that operate flights from Portland to Heathrow. Compare their services, reliability, and customer satisfaction ratings to choose the airline that best suits your travel preferences and needs. Over the last 7 days, Cheapflights users made 2,558,603 searches. Data last updated May 4, 2026.
| Airline | Cheapest | Average | Flexibility | On-time |
|---|---|---|---|---|
| Cheapest$648 | Average$798 | FlexibilityNo cancel fee | On-time69% |