$330+ Cheap flights from Portland, ME (PWM) to Heathrow (LHR)
This is the cheapest round-trip flight price found by a Cheapflights user in the last 72 hours by searching for a flight departing on 3/31. Fares are subject to change and may not be available on all flights or dates of travel.
PWM — LHR
Dec 10 — Dec 171
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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Review each provider’s pricing and select the best option for you! Book through your favorite provider’s website for a seamless experience.Cheap flight deals from Portland to Heathrow
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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 November 10, 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 November 10, 2026.
This Cheapflightsfares deal was found by Cheapflights users on 11/5. 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.
Thu 11/126:30 am -
1 stop10h 10m
Wed 11/1812:20 pm -
1 stop16h 23m
Deal found 11/5![JetBlue logo]()
$845
This Justfly.com deal was found by Cheapflights users on 11/9. 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.
Tue 12/16:00 am -
2 stops34h 00m
Wed 12/99:00 am -
2 stops41h 12m
Deal found 11/9![Air Canada logo]()
$852
This Expedia deal was found by Cheapflights users on 11/9. 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 Expedia is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 12/112:49 pm -
1 stop13h 56m
Wed 12/911:45 am -
2 stops17h 36m
Deal found 11/9![KLM logo]()
$862
This United Airlines deal was found by Cheapflights users on 11/5. 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 11/125:50 am -
1 stop9h 45m
Wed 11/189:00 am -
2 stops19h 21m
Deal found 11/5![United Airlines logo]()
$875
This United Airlines deal was found by Cheapflights users on 11/7. 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 12/56:00 am -
1 stop19h 20m
Sat 12/1212:05 pm -
2 stops16h 19m
Deal found 11/7![United Airlines logo]()
$876
This Delta deal was found by Cheapflights users on 11/6. 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 12/44:00 pm -
1 stop10h 15m
Fri 12/1110:00 am -
2 stops18h 52m
Deal found 11/6![Delta logo]()
$877
This United Airlines deal was found by Cheapflights users on 11/8. 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 11/155:50 am -
2 stops20h 20m
Thu 11/199:00 am -
2 stops19h 21m
Deal found 11/8![United Airlines logo]()
$880
This United Airlines deal was found by Cheapflights users on 11/8. 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 11/172:05 pm -
2 stops14h 05m
Mon 11/2312:05 pm -
2 stops16h 16m
Deal found 11/8![United Airlines logo]()
$881
This Delta deal was found by Cheapflights users on 11/9. 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 12/412:49 pm -
2 stops16h 41m
Tue 12/810:00 am -
2 stops18h 33m
Deal found 11/9![Delta logo]()
$882
This Air Canada deal was found by Cheapflights users on 11/5. 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 11/128:49 am -
2 stops31h 11m
Wed 11/181:00 pm -
2 stops39h 21m
Deal found 11/5![Air Canada logo]()
$886
This United Airlines deal was found by Cheapflights users on 11/6. 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 12/86:00 am -
1 stop10h 20m
Fri 12/111:00 pm -
2 stops35h 25m
Deal found 11/6![United Airlines logo]()
$887
This Air Canada deal was found by Cheapflights users on 11/8. 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.
Sun 11/159:46 am -
2 stops16h 24m
Thu 11/199:00 am -
3 stops19h 21m
Deal found 11/8![Multiple Airlines logo]()
$888
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 November 10, 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 November 10, 2026.
This United Airlines deal was found by Cheapflights users on 11/7. 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 2/233:14 pm -
1 stop14h 11m
Thu 2/256:50 am -
2 stops21h 35m
Deal found 11/7![United Airlines logo]()
$763
This Delta deal was found by Cheapflights users on 11/6. 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 12/64:00 pm -
1 stop11h 05m
Sun 12/138:40 am -
2 stops20h 41m
Deal found 11/6![Delta logo]()
$877
This United Airlines deal was found by Cheapflights users on 11/7. 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 12/56:00 am -
1 stop19h 20m
Sat 12/1212:05 pm -
2 stops16h 19m
Deal found 11/7![United Airlines logo]()
$876
This Delta deal was found by Cheapflights users on 11/6. 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 12/412:49 pm -
2 stops16h 41m
Fri 12/118:40 am -
2 stops20h 41m
Deal found 11/6![Delta logo]()
$882
This Delta deal was found by Cheapflights users on 11/9. 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 12/412:49 pm -
2 stops16h 41m
Tue 12/810:00 am -
2 stops18h 33m
Deal found 11/9![Delta logo]()
$882
This United Airlines deal was found by Cheapflights users on 11/6. 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 12/86:00 am -
1 stop10h 20m
Fri 12/111:00 pm -
2 stops35h 25m
Deal found 11/6![United Airlines logo]()
$887
This Delta deal was found by Cheapflights users on 11/5. 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 3/182:35 pm -
2 stops15h 55m
Tue 3/236:30 am -
2 stops21h 19m
Deal found 11/5![Delta logo]()
$893
This United Airlines deal was found by Cheapflights users on 11/9. 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.
Fri 12/42:15 pm -
1 stop11h 25m
Tue 12/89:10 am -
1 stop15h 15m
Deal found 11/9![United Airlines logo]()
$907
This Delta deal was found by Cheapflights users on 11/8. 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 1/216:00 am -
2 stops20h 55m
Wed 1/276:30 am -
2 stops21h 56m
Deal found 11/8![Delta logo]()
$895
This Delta deal was found by Cheapflights users on 11/6. 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 12/812:49 pm -
2 stops14h 16m
Fri 12/1110:00 am -
2 stops18h 52m
Deal found 11/6![Delta logo]()
$907
Last-minute flights from Portland to HeathrowDiscover last-minute flight deals from Portland to Heathrow. Data last updated November 10, 2026 and is based on user searches.
Discover last-minute flight deals from Portland to Heathrow. Data last updated November 10, 2026 and is based on user searches.
This Cheapflightsfares deal was found by Cheapflights users on 11/5. 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.
Thu 11/126:30 am -
1 stop10h 10m
Wed 11/1812:20 pm -
1 stop16h 23m
Deal found 11/5![JetBlue logo]()
$845
This United Airlines deal was found by Cheapflights users on 11/5. 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 11/125:50 am -
1 stop9h 45m
Wed 11/189:00 am -
2 stops19h 21m
Deal found 11/5![United Airlines logo]()
$875
This Air Canada deal was found by Cheapflights users on 11/5. 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 11/128:49 am -
2 stops31h 11m
Wed 11/181:00 pm -
2 stops39h 21m
Deal found 11/5![Air Canada logo]()
$886
This United Airlines deal was found by Cheapflights users on 11/8. 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 11/155:50 am -
2 stops20h 20m
Thu 11/199:00 am -
2 stops19h 21m
Deal found 11/8![United Airlines logo]()
$880
This Air Canada deal was found by Cheapflights users on 11/8. 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.
Sun 11/159:46 am -
2 stops16h 24m
Thu 11/199:00 am -
3 stops19h 21m
Deal found 11/8![Multiple Airlines logo]()
$888
This United Airlines deal was found by Cheapflights users on 11/8. 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 11/172:05 pm -
2 stops14h 05m
Mon 11/2312:05 pm -
2 stops16h 16m
Deal found 11/8![United Airlines logo]()
$881
This Justfly.com deal was found by Cheapflights users on 11/9. 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.
Tue 12/16:00 am -
2 stops34h 00m
Wed 12/99:00 am -
2 stops41h 12m
Deal found 11/9![Air Canada logo]()
$852
This Expedia deal was found by Cheapflights users on 11/9. 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 Expedia is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 12/112:49 pm -
1 stop13h 56m
Wed 12/911:45 am -
2 stops17h 36m
Deal found 11/9![KLM logo]()
$862
This Delta deal was found by Cheapflights users on 11/6. 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 12/44:00 pm -
1 stop10h 15m
Fri 12/1110:00 am -
2 stops18h 52m
Deal found 11/6![Delta logo]()
$877
This Delta deal was found by Cheapflights users on 11/9. 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 12/412:49 pm -
2 stops16h 41m
Tue 12/810:00 am -
2 stops18h 33m
Deal found 11/9![Delta logo]()
$882
This United Airlines deal was found by Cheapflights users on 11/7. 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 12/56:00 am -
1 stop19h 20m
Sat 12/1212:05 pm -
2 stops16h 19m
Deal found 11/7![United Airlines logo]()
$876
This United Airlines deal was found by Cheapflights users on 11/6. 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 12/86:00 am -
1 stop10h 20m
Fri 12/111:00 pm -
2 stops35h 25m
Deal found 11/6![United Airlines logo]()
$887
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 November 10, 2026.
Search for one-way flight options from Portland to Heathrow. Find affordable one-way fares based on user searches. Data last updated November 10, 2026.
This United Airlines deal was found by Cheapflights users on 11/5. 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 3/316:00 am -
1 stop10h 25m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 11/5![United Airlines logo]()
$330
This Virgin Atlantic deal was found by Cheapflights users on 11/6. 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 3/106:00 am -
1 stop19h 25m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 11/6![Virgin Atlantic logo]()
$334
This Air Canada deal was found by Cheapflights users on 11/5. 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 3/319:10 am -
3 stops16h 20m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 11/5![Air Canada logo]()
$342
This United Airlines deal was found by Cheapflights users on 11/5. 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.
Mon 11/235:30 am -
2 stops19h 25m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 11/5![United Airlines logo]()
$347
This Justfly.com deal was found by Cheapflights users on 11/9. 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.
Fri 11/276:00 am -
2 stops20h 10m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 11/9![Air Canada logo]()
$349
This Air Canada deal was found by Cheapflights users on 11/5. 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.
Mon 11/238:49 am -
3 stops16h 41m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 11/5![Air Canada logo]()
$356
This British Airways deal was found by Cheapflights users on 11/5. 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.
Fri 1/16:00 am -
1 stop23h 00m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 11/5![Multiple Airlines logo]()
$359
This Cheapflightsfares deal was found by Cheapflights users on 11/9. 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 11/176:30 am -
1 stop10h 10m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 11/9![JetBlue logo]()
$367
This American Airlines deal was found by Cheapflights users on 11/5. 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 American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 4/166:01 pm -
1 stop12h 59m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 11/5![American Airlines logo]()
$384
This United Airlines deal was found by Cheapflights users on 11/9. 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 11/178:49 am -
2 stops16h 51m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 11/9![United Airlines logo]()
$411
This Delta deal was found by Cheapflights users on 11/5. 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 4/164:50 pm -
2 stops15h 25m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 11/5![Delta logo]()
$446
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 November 10, 2026.
Most accurate provider | Ovago 3 stars |
|---|---|
Most trusted provider | Ovago 3 stars |
Round-trip from | $763 (United Airlines) |
One-way from | $330 (United Airlines) |
Popular in | June |
Cheapest in | March |
Average price | $934 |
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 7,457,451 searches. Data last updated November 10, 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
Quickest round-trip
PortlandLondon
PWM Portland - LHR London Heathrow
PWMLHR
Portland
Wed 3/31
6:00 am-9:25 pm
1 stop10h 25m
London Heathrow
Wed 12/31
12:00 am-6:00 pm
Nonstop0h 00m
$330
PortlandLondon
PWM Portland - LHR London Heathrow
PWMLHR
Portland
Wed 3/10
6:00 am-6:25 am
1 stop19h 25m
London Heathrow
Wed 12/31
12:00 am-6:00 pm
Nonstop0h 00m
$334
PortlandLondon
PWM Portland - LHR London Heathrow
PWMLHR
Portland
Mon 11/23
2:05 pm-9:00 am
1 stop13h 55m
London Heathrow
Wed 12/31
12:00 am-6:00 pm
Nonstop0h 00m
$347
PortlandLondon
PWM Portland - LHR London Heathrow
PWMLHR
Portland
Mon 11/23
5:30 am-5:55 am
2 stops19h 25m
London Heathrow
Wed 12/31
12:00 am-6:00 pm
Nonstop0h 00m
$347
PortlandLondon
PWM Portland - LHR London Heathrow
PWMLHR
Portland
Fri 11/27
8:49 am-6:30 am
3 stops16h 41m
London Heathrow
Wed 12/31
12:00 am-6:00 pm
Nonstop0h 00m
$352
PortlandLondon
PWM Portland - LHR London Heathrow
PWMLHR
Portland
Tue 2/23
3:14 pm-10:25 am
1 stop14h 11m
London Heathrow
Thu 2/25
6:50 am-11:25 pm
2 stops21h 35m
$763
PortlandLondon
PWM Portland - LHR London Heathrow
PWMLHR
Portland
Sat 12/5
6:00 am-6:20 am
1 stop19h 20m
London Heathrow
Sat 12/12
12:05 pm-11:24 pm
2 stops16h 19m
$876
PortlandLondon
PWM Portland - LHR London Heathrow
PWMLHR
Portland
Sun 12/6
4:00 pm-8:05 am
1 stop11h 05m
London Heathrow
Sun 12/13
8:40 am-12:21 am
2 stops20h 41m
$877
PortlandLondon
PWM Portland - LHR London Heathrow
PWMLHR
Portland
Fri 12/4
12:49 pm-10:30 am
2 stops16h 41m
London Heathrow
Fri 12/11
8:40 am-12:21 am
2 stops20h 41m
$882
PortlandLondon
PWM Portland - LHR London Heathrow
PWMLHR
Portland
Fri 12/4
12:49 pm-10:30 am
2 stops16h 41m
London Heathrow
Tue 12/8
10:00 am-11:33 pm
2 stops18h 33m
$882
Showing 1-10 of 15 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 November.
| 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 November 10, 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
Overall
7.3
Crew
8.1
Entertainment
7.1
Comfort
7.3
Food
6.7
Reviews
1 / 20
8.0
ExcellentAsha,Sep 2026
LGA - IAH
Boarding
7.7
Overall
7.3
Crew
8.1
Entertainment
7.1
Comfort
7.3
Food
6.7
Reviews
1 / 20
8.0
ExcellentAsha,Sep 2026
LGA - IAH
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
Dorking
Gatwick
Hounslow
Wembley
Harrow
Southend-on-Sea
Basingstoke
Northampton
Dartford
Winchester
Croydon
Kingston upon Thames
Chipping Norton
Slough
Eastbourne
Watford
Stansted
Sutton
Luton
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Other flights to Heathrow
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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 7,457,451 searches. Data last updated November 10, 2026.
| Airline | Cheapest | Average | Flexibility | On-time |
|---|---|---|---|---|
| Cheapest$752 | Average$1,192 | FlexibilityNo cancel fee | On-time69% |