Latest deals
Insights
FAQs
Reviews
Price Alerts

Cheap flights from Portland, Maine to the United Kingdom from $465

This is the cheapest one-way flight price found by a momondo user in the last 72 hours by searching for a flight from Portland, Maine to the United Kingdom departing on 12/4. Fares may change, and may not be available for all flights or travel dates. Click the price to refresh the search for this deal.
1 adult
0 bags

Discover deals from 900+ travel sites with momondo.

Save money when you book flights with momondo

Big names and deals

Big names and deals

Search 100s of travel sites to compare prices.

Filter for what you want

Filter for what you want

Free Wi-Fi? Stopover? Instantly customize your results.

Trusted and free

Trusted and free

We’re completely free to use - no hidden charges or fees.

Price Alerts

Price Alerts

Not ready to book? to track prices.
Search flight deals

Find the cheapest flights from Portland, Maine to the United Kingdom

Cheap round-trip flights

Enter your travel dates to find the best prices.
KLM Logo
4:48 pm - 8:45 amPWM-LHR
10h 57m1 stop
KLM Logo
11:45 am - 11:54 pmLHR-PWM
17h 09m2 stops
$594KLM
Find Deal
Tue, Nov 4 - Wed, Nov 12
Delta Logo
6:00 am - 7:50 amPWM-LHR
20h 50m1 stop
Delta Logo
6:30 am - 11:54 pmLHR-PWM
22h 24m2 stops
$597Delta
Find Deal
Tue, Nov 4 - Thu, Nov 13
KLM Logo
1:27 pm - 7:50 amPWM-LHR
13h 23m1 stop
KLM Logo
12:30 pm - 10:19 pmLHR-PWM
14h 49m1 stop
$601KLM
Find Deal
Tue, Nov 4 - Tue, Nov 11
Scandinavian Airlines Logo
6:35 am - 4:00 pmPWM-LHR
28h 25m2 stops
Scandinavian Airlines Logo
6:40 pm - 11:54 pmLHR-PWM
34h 14m2 stops
$615Scandinavian Airlines
Find Deal
Mon, Nov 17 - Fri, Nov 21
United Airlines Logo
7:22 pm - 4:50 pmPWM-LHR
16h 28m2 stops
United Airlines Logo
11:10 am - 11:05 pmLHR-PWM
16h 55m2 stops
$639United Airlines
Find Deal
Mon, Nov 3 - Fri, Nov 14
Air France Logo
12:53 pm - 8:45 amPWM-LHR
14h 52m1 stop
Air France Logo
8:55 am - 10:23 pmLHR-PWM
18h 28m1 stop
$642Air France
Find Deal
Sun, Dec 7 - Sun, Dec 14
Multiple Airlines Logo
3:19 pm - 11:20 amPWM-LHR
15h 01m2 stops
Multiple Airlines Logo
9:00 am - 11:17 pmLHR-PWM
19h 17m3 stops
$664Multiple Airlines
Find Deal
Wed, Nov 5 - Wed, Nov 12
United Airlines Logo
6:00 am - 8:35 pmPWM-LHR
9h 35m1 stop
United Airlines Logo
11:10 am - 11:01 pmLHR-PWM
16h 51m2 stops
$670United Airlines
Find Deal
Thu, Nov 6 - Tue, Nov 11
Multiple Airlines Logo
7:22 pm - 5:40 pmPWM-LCY
17h 18m2 stops
Multiple Airlines Logo
9:50 am - 11:59 pmLCY-PWM
19h 09m2 stops
$676Multiple Airlines
Find Deal
Wed, Nov 5 - Wed, Nov 12
Scandinavian Airlines Logo
2:38 pm - 6:30 pmPWM-LHR
22h 52m2 stops
Scandinavian Airlines Logo
6:40 am - 11:54 pmLHR-PWM
22h 14m2 stops
$900Scandinavian Airlines
Find Deal
Tue, Nov 4 - Mon, Nov 10

KLM flights from Portland, Maine to United Kingdom

Our best KLM deals on Portland, Maine to United Kingdom flight tickets
KLM
Nov 4
PWM4:48 pmPortland
10h 57m
1 stop
LHR8:45 amLondon Heathrow
Nov 12
LHR11:45 amLondon Heathrow
17h 09m
2 stops
PWM11:54 pmPortland
$594
Find similar
KLM
Nov 4
PWM1:27 pmPortland
13h 23m
1 stop
LHR7:50 amLondon Heathrow
Nov 11
LHR12:30 pmLondon Heathrow
14h 49m
1 stop
PWM10:19 pmPortland
$601
Find similar
KLM
Dec 3
PWM2:34 pmPortland
17h 11m
2 stops
GLA12:45 pmGlasgow Intl
Dec 10
GLA1:25 pmGlasgow Intl
15h 34m
2 stops
PWM11:59 pmPortland
$670
Find similar

Scandinavian Airlines flights from Portland, Maine to United Kingdom

Our best Scandinavian Airlines deals on Portland, Maine to United Kingdom flight tickets
Scandinavian Airlines
Nov 17
PWM6:35 amPortland
28h 25m
2 stops
LHR4:00 pmLondon Heathrow
Nov 21
LHR6:40 pmLondon Heathrow
34h 14m
2 stops
PWM11:54 pmPortland
$615
Find similar
Scandinavian Airlines
Nov 4
PWM2:38 pmPortland
22h 52m
2 stops
LHR6:30 pmLondon Heathrow
Nov 10
LHR6:40 amLondon Heathrow
22h 14m
2 stops
PWM11:54 pmPortland
$900
Find similar
Scandinavian Airlines
Nov 17
PWM6:35 amPortland
28h 25m
2 stops
LHR4:00 pmLondon Heathrow
Nov 21
LHR6:40 amLondon Heathrow
22h 14m
3 stops
PWM11:54 pmPortland
$1,105
Find similar

momondo Fare Finder

 
Customize your flight search to find flights from Portland, Maine to United Kingdom 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, momondo users made 832,500 searches. Data last updated October 21, 2025.
Use the filters below to find and compare flights from Portland, Maine to the United Kingdom that are best for you.

Fly from

Fly to

Route

Depart

Return

Price

PortlandLondon

PWM - LHR

PWMLHR

Portland

Tue 11/4

4:48 pm-8:45 am

1 stop10h 57m

London Heathrow

Wed 11/12

11:45 am-11:54 pm

2 stops17h 09m

$594

PortlandLondon

PWM - LHR

PWMLHR

Portland

Tue 11/4

6:00 am-7:50 am

1 stop20h 50m

London Heathrow

Thu 11/13

6:30 am-11:54 pm

2 stops22h 24m

$597

PortlandLondon

PWM - LHR

PWMLHR

Portland

Tue 11/4

1:27 pm-7:50 am

1 stop13h 23m

London Heathrow

Tue 11/11

12:30 pm-10:19 pm

1 stop14h 49m

$601

PortlandLondon

PWM - LHR

PWMLHR

Portland

Mon 11/17

6:35 am-4:00 pm

2 stops28h 25m

London Heathrow

Fri 11/21

6:40 pm-11:54 pm

2 stops34h 14m

$615

PortlandLondon

PWM - LHR

PWMLHR

Portland

Mon 11/3

7:22 pm-4:50 pm

2 stops16h 28m

London Heathrow

Fri 11/14

11:10 am-11:05 pm

2 stops16h 55m

$639

PortlandLondon

PWM - LHR

PWMLHR

Portland

Sun 12/7

12:53 pm-8:45 am

1 stop14h 52m

London Heathrow

Sun 12/14

8:55 am-10:23 pm

1 stop18h 28m

$642

PortlandLondon

PWM - LHR

PWMLHR

Portland

Wed 11/5

3:19 pm-11:20 am

2 stops15h 01m

London Heathrow

Wed 11/12

9:00 am-11:17 pm

3 stops19h 17m

$664

PortlandLondon

PWM - LHR

PWMLHR

Portland

Thu 11/6

6:00 am-8:35 pm

1 stop9h 35m

London Heathrow

Tue 11/11

11:10 am-11:01 pm

2 stops16h 51m

$670

PortlandLondon

PWM - LCY

PWMLCY

Portland

Wed 11/5

7:22 pm-5:40 pm

2 stops17h 18m

London City

Wed 11/12

9:50 am-11:59 pm

2 stops19h 09m

$676

PortlandLondon

PWM - LHR

PWMLHR

Portland

Tue 11/4

2:38 pm-6:30 pm

2 stops22h 52m

London Heathrow

Mon 11/10

6:40 am-11:54 pm

2 stops22h 14m

$900

Flights are sorted by cheapest round-trip flights first.

Showing 1-10 of 20 resultsSorted by cheapest first
1
2

See travel insights to the United Kingdom from

How to get the cheapest flight ticket from Portland, Maine to United Kingdom

Look no further. We've gone through all the searches for this route on momondo so you have the important information and insights to find the cheapest flight ticket for your trip

What is the cheapest month to fly to United Kingdom?

In general, October is the cheapest month to fly from Portland, Maine to United Kingdom. Due to it being the ‘off-season’ during this time, you can expect flight prices to be around $638. If you aren’t able to travel to United Kingdom during the month of October, then flying in February is also cheap. Prices for this month can be found on momondo for an average of $713.

What is the cheapest day to depart on your flight to United Kingdom?

The cheapest day to depart from Portland, Maine to United Kingdom is on a Tuesday when prices can be found for as low as $788. The most expensive day to fly to United Kingdom is Friday, with ticket prices averaging around $936.

What is the cheapest time of day to depart on your flight to United Kingdom?

According to our data, the cheapest time of day to fly to United Kingdom is at noon. momondo users have found flights departing from Portland, Maine to United Kingdom at noon for as low as $827. Keep in mind that these prices may fluctuate based on what airline you choose and the time of year you plan to travel. Flights to United Kingdom are more costly in the afternoon, with an average ticket price of $869. Departure times in the afternoon fall within the peak daily travel times, which is why tickets can be more expensive.

Can stopping save me money on Portland, Maine to United Kingdom flights?

You could potentially save up to 41% on your flight if you consider stops on a Portland, Maine to United Kingdom flight.

Cheap Portland, Maine to United Kingdom flight deals and tips

Find info about flight duration, direct flights, and airports for your flight from Portland, Maine to United Kingdom

Direct flights

None
There are no direct flights from Portland, Maine to United Kingdom. There are no popular flight routes from Portland, Maine to United Kingdom.
Search flight deals

  • When did momondo last update prices for flights from Portland Airport to United Kingdom?

    Prices for flights from Portland Airport to United Kingdom refresh daily.

  • How many operators does momondo search for flights from Portland Airport to United Kingdom?

  • How old do you have to be to fly from Portland Airport to United Kingdom?

    Although the minimum age for a child to fly alone is five, airlines that offer an unaccompanied minor (UMNR) service may have their own age limits, which could be impacted by factors such as flight length, timing, and layovers. It is recommended that you verify with the airline you are booking with for travel from Portland Airport to United Kingdom.

  • What documentation or ID do you need to fly to United Kingdom?

    The required travel and health documents for your United Kingdom trip may vary depending on your itinerary and personal circumstances. As a general rule, you should carry multiple documents, including a national ID card or driver's license and a passport valid for six months after your intended arrival at United Kingdom. We recommend that you seek guidance from your airline or a reliable third party such as IATA.

Best airlines flying from Portland, Maine to United Kingdom

Compare and see reviews for airlines that fly from Portland, Maine to United Kingdom with momondo
Airline
Rating
Free Cancellation
Price
United AirlinesPriceFrom $648Free CancellationRating
7.4
8,991 reviews
Search United Airlines flights
DeltaPriceFrom $683Free CancellationRating
7.9
7,978 reviews
Search Delta flights
JetBluePriceFrom $695Free CancellationRating
7.2
2,909 reviews
Search JetBlue flights

Why use momondo?

Why should I use momondo to find a flight deal from Portland to United Kingdom?

momondo collates all your flight options in one place and lets you filter them to find the perfect flight from Portland to United Kingdom. momondo saves you time and could save you money on your trip.

Can I find flights from Portland to United Kingdom with flexible booking policies on momondo?

Yes. momondo enables you to select and highlight flights to United Kingdom from Portland with this policy.

How can momondo help me find flights from Portland to United Kingdom?

Once you have performed a search in the form on the page, momondo provides useful filters and insights. We can show you the cheapest days and times to fly as well as help filter your options to help you make an informed choice when booking flights to United Kingdom from Portland.

I’m not ready to book a flight from Portland to United Kingdom right now. Can momondo alert me if prices change?

If you are simply researching potential flights to United Kingdom, momondo offers a useful price alert feature which will track prices for flights to United Kingdom from Portland and alert you when they change.

An easier way to manage your United Kingdom trip

We make it super easy to schedule, organize and travel with friends or family. Trips is free — and available to use no matter where you book.
Start using Trips
Find my bookings

Get notified when prices go down

Daily price changes in your inbox - only with Price Alerts.
1 adult
Thu 11/20
Thu 11/27
By creating a price alert you accept our terms of use and privacy policy.

Find better results for your trip to the United Kingdom

Popular cities in the United Kingdom

Popular flights according to clicks in the last 7 days on momondo
Flights to Londonfrom $329
Flights to Manchesterfrom $363
Flights to Edinburghfrom $406
Flights to Glasgowfrom $408
Flights to Birminghamfrom $402
Flights to Newcastle upon Tynefrom $478
Flights to Belfastfrom $459
Flights to Bristolfrom $441
Flights to Invernessfrom $422
Flights to Liverpoolfrom $473
Flights to Aberdeenfrom $513
Flights to Leedsfrom $442