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Cheap flights from Portland to London from £225

PDX — LON
25 Nov — 2 Dec1
1 adult
1 adult, Economy, 0 bags
Cheapflights Tip: The best prices from Portland to London are usually found in January or February, booked 90 days in advance, depart on a Thursday or Friday and return on a Tuesday

Cheap flight deals from Portland to London

Enter your travel dates to find the best prices.

Cheapest flights from Portland to London

Mon 7/1214:45 -
1 stop16h 45m
Fri 11/1206:00 -
1 stop19h 00m
Deal found 24/10£571
Tue 3/1114:45 -
2 stops18h 05m
Tue 10/1117:00 -
3 stops32h 00m
Deal found 22/10£576
Mon 9/1114:45 -
1 stop20h 45m
Tue 17/1120:35 -
1 stop28h 25m
Deal found 22/10£581
Mon 7/1214:45 -
1 stop12h 05m
Fri 11/1212:15 -
1 stop12h 45m
Deal found 22/10£582
Tue 10/1114:45 -
1 stop20h 45m
Tue 17/1120:35 -
1 stop28h 25m
Deal found 26/10£584
Mon 16/1114:45 -
1 stop12h 05m
Tue 24/1120:35 -
1 stop28h 25m
Deal found 23/10£587
Thu 31/1214:45 -
1 stop14h 35m
Sun 10/107:00 -
1 stop18h 00m
Deal found 23/10£587
Tue 3/1114:45 -
1 stop12h 05m
Tue 10/1120:35 -
1 stop28h 25m
Deal found 22/10£588
Tue 10/1114:45 -
2 stops22h 35m
Tue 17/1118:20 -
3 stops30h 40m
Deal found 25/10£600
Mon 16/1114:45 -
2 stops21h 55m
Tue 24/1118:40 -
3 stops30h 20m
Deal found 23/10£606
Tue 8/1214:45 -
1 stop12h 05m
Wed 16/1212:15 -
1 stop12h 45m
Deal found 23/10£606
Tue 3/1107:00 -
3 stops30h 40m
Mon 9/1119:30 -
3 stops31h 01m
Deal found 25/10£607

Find flight deals from Portland to London

Round-trip from

£565

One-way from

£225

Popular in

July

Cheapest in

January

Average price

£721

Good round-trip deal

£1,319 or less
1/3-15/3
  • 1/3-15/3
  • 2 total stops
  • 34h 05m total
  • Portland to London
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Icelandair
  • Icelandair
  • 7/12-31/12
  • 1 total stop
  • 20h 45m total
  • Portland to London
Search Deals
Highest demand for flights based on searches. 17% potential increase in price (£110 potential increase over avg. return price).
Search Deals
Cheapest flight prices on average. 3% potential price decrease (£18 potential savings vs. average return price).
Search Deals
Average for round-trip flights in October 2026
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Price to beat on a round-trip flight from Portland to London (LON).
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Cheapflights Fare Finder

 
Use the filters below to find and compare flights from Portland to London that are best for you.

Fly from

Fly to

Route

Depart

Return

Price

Cheapest return flight

PortlandLondon

PDX Portland - LGW London Gatwick

PDXLGW

Portland

Mon 30/11

14:45-16:20

2 stops17h 35m

London Gatwick

Wed 31/12

00:00-15:00

Nonstop0h 00m

£237

PortlandLondon

PDX Portland - LHR London Heathrow

PDXLHR

Portland

Mon 5/4

13:45-10:00

1 stop12h 15m

London Heathrow

Wed 31/12

00:00-15:00

Nonstop0h 00m

£254

PortlandLondon

PDX Portland - LHR London Heathrow

PDXLHR

Portland

Mon 5/4

16:05-06:30

3 stops30h 25m

London Heathrow

Wed 31/12

00:00-15:00

Nonstop0h 00m

£261
Fastest return journey

PortlandLondon

PDX Portland - LHR London Heathrow

PDXLHR

Portland

Mon 22/3

18:45-11:20

Nonstop9h 35m

London Heathrow

Wed 31/12

00:00-15:00

Nonstop0h 00m

£266

PortlandLondon

PDX Portland - LGW London Gatwick

PDXLGW

Portland

Sat 31/10

15:45-10:00

3 stops35h 15m

London Gatwick

Wed 31/12

00:00-15:00

Nonstop0h 00m

£295

PortlandLondon

PDX Portland - LGW London Gatwick

PDXLGW

Portland

Sat 6/2

18:10-15:35

2 stops37h 25m

London Gatwick

Wed 31/12

00:00-15:00

Nonstop0h 00m

£299

PortlandLondon

PDX Portland - LGW London Gatwick

PDXLGW

Portland

Tue 19/1

10:59-15:20

2 stops20h 21m

London Gatwick

Wed 31/12

00:00-15:00

Nonstop0h 00m

£302

PortlandLondon

PDX Portland - LGW London Gatwick

PDXLGW

Portland

Wed 31/3

06:55-14:55

3 stops24h 00m

London Gatwick

Wed 31/12

00:00-15:00

Nonstop0h 00m

£323

PortlandLondon

PDX Portland - LGW London Gatwick

PDXLGW

Portland

Sun 22/11

20:54-20:45

3 stops39h 51m

London Gatwick

Wed 31/12

00:00-15:00

Nonstop0h 00m

£330

PortlandLondon

PDX Portland - LGW London Gatwick

PDXLGW

Portland

Wed 2/12

07:00-17:45

3 stops26h 45m

London Gatwick

Wed 31/12

00:00-15:00

Nonstop0h 00m

£348

Flights are sorted by cheapest return flights first.

Deals found on 22/10

Showing 1-10 of 43 resultsSorted by cheapest first
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Best time to book a flight from Portland to London

Have a flexible travel schedule? Discover the best time to fly to London from Portland with our price prediction graph.
Estimated return price

Cheapflights Insights

Everything you need to know about your flight from Portland to London

What is the cheapest month to book a flight from Portland to London?

Currently, January is the cheapest month in which you can book a flight from Portland to London (average of £558). Flying from Portland to London in July is currently the most expensive (average of £981). 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.

What is the cheapest time of day to fly from PDX to LON?

When flying from Portland to London, the time of day you decide to fly out makes little to no difference towards the overall price you’ll pay on tickets.

How much does it cost for a return flight from Portland to London?

Airfare is typical for this route at the moment.
Portland to London flights typically cost between £557 and £802 in March.
The cheapest return price found within the last 5 days was £565 on Multiple Airlines (1 Mar–15 Mar).

What’s the top stopover airport for flights from Portland to London?

Reykjavik (KEF) – chosen by Cheapflights users on 63% of one-stop itineraries from Portland to London on Cheapflights.

What’s the cheapest stopover airport for flights from Portland to London?

Reykjavik (KEF) is the most affordable one-stop option, with an average return flight price of £591.

What’s the fastest stopover option from Portland to London?

Flights via Reykjavik (KEF) have the shortest average one-way travel time for one-stop routes: 12h 15m.

Which airport typically offers the quickest stopover for flights from Portland to London?

Flights via Reykjavik (KEF) offer the fastest connection on this route, with an average stopover time of 1h 30m.

How far ahead should I book a flight from Portland to London?

Booking 22 days in advance of your planned departure date is, on average, the best time to get cheap flights from Portland to London. The general trend is that the closer you book to the departure date, the more expensive your flight will be.

Reviews of airlines servicing London

Read reviews from past customers who have flown with Icelandair and British Airways from Portland to London. Users can see the overall rating for each airline as well as how each is rated in terms of entertainment options, comfort, food, crew/service, and boarding process.
Icelandair
7.0
Good
766 reviews
Check prices

Food

6.1

Crew

8.0

Boarding

7.2

Entertainment

6.9

Overall

7.0

Comfort

6.9

Reviews

1 / 20
6.0
Good

William,Jun 2026

SEA - KEF

First time Iceland Air. Ridiculously small amount of leg room, flight was hotter than hades and people kept requesting for cooler air that never came. You pay for everything, no food of any kind unless you pay which I've never seen on a flight of this length. Just seemed like they are cheap as possible about everything. Won't fly with them again if I can avoid it.
Icelandair
7.0
Good
766 reviews
Icelandair
7.0
Good
766 reviews
Check prices

Food

6.1

Crew

8.0

Boarding

7.2

Entertainment

6.9

Overall

7.0

Comfort

6.9

Reviews

1 / 20
6.0
Good

William,Jun 2026

SEA - KEF

First time Iceland Air. Ridiculously small amount of leg room, flight was hotter than hades and people kept requesting for cooler air that never came. You pay for everything, no food of any kind unless you pay which I've never seen on a flight of this length. Just seemed like they are cheap as possible about everything. Won't fly with them again if I can avoid it.
British Airways
6.7
Okay
8,271 reviews
Icelandair
7.0
Good
766 reviews
Check prices

Food

6.1

Crew

8.0

Boarding

7.2

Entertainment

6.9

Overall

7.0

Comfort

6.9

Reviews

1 / 20
6.0
Good

William,Jun 2026

SEA - KEF

First time Iceland Air. Ridiculously small amount of leg room, flight was hotter than hades and people kept requesting for cooler air that never came. You pay for everything, no food of any kind unless you pay which I've never seen on a flight of this length. Just seemed like they are cheap as possible about everything. Won't fly with them again if I can avoid it.

Related info for your journey

  • What airport do you fly from for flights from Portland to London?

    For a flight from Portland to London, you will be flying from Portland. Portland (PDX) is just 6.0 mi from the center of the city. Portland is the only Portland airport and it handles 4 outbound flights to London per day. 1 airline has flights to London from Portland on a regular basis.

  • How long is the flight from Portland to London?

    For as low as £722, United Airlines can have you in London from Portland in 18h 07m. The distance between Portland and London is about 4921 mi. This flight may include one or multiple stops.

  • What is the cheapest airline to fly from Portland to London round-trip?

    Cheapflights users have booked flights from Portland to London round-trip from £461. British Airways is 35% cheaper than the average price of flights available within the next 90 days to this destination.

  • What are the most popular routes from Portland to London?

    When deciding which route to take from Portland to London consider Portland - London Heathrow, Portland - London Gatwick or Portland - London Stansted as they are the most popular.

  • What are the most reliable airlines from Portland to London?

    The top 3 most reliable airlines when flying from Portland to London are American Airlines (83%), Alaska Airlines (83%) and Aer Lingus (83%).

  • What are the cheapest flights from Portland to London?

    Looking at all options, your cheapest flight can be booked for £776. While the most popular route (Portland - London Heathrow) can be booked for £511 on average, our data indicates £1,701 when flying from Portland to London.

  • Can I find deals for flights from Portland to London that include hotel bookings?

    Yes. In addition to deals on Portland to London flights, Cheapflights offers holiday packages that include both flights and hotel.

  • How can I find direct flights from Portland to London?

    After entering your origin and destination, apply the non-stop filter on the search result page to find direct flights from Portland to London.

  • Can I find deals for business class flights from Portland to London?

    Yes. Cheapflights offers flight deals from Portland to London 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 to London?

    Currently, January is the cheapest month in which you can book a flight from Portland to London (average of £558). Flying from Portland to London in July is currently the most expensive (average of £981). 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?

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Top airline flying from Portland to London

AirlineCheapestAverageFlexibilityOn-time
British AirwaysCheapest£461Average£843FlexibilityNo cancel feeOn-time70%
Search British Airways flights

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When you search for this flight from Portland to London, Cheapflights searches on 900+ travel sites to save you time finding great flight deals online. Additionally, we offer filter features so you can choose a preferred cabin class or airline, see different price ranges, and much more so you can book the flight for you.

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Can Cheapflights find flights from Portland to London with no change fees?

Cheapflights does show flights with no change fees to all users. To see these options for flights from Portland to London, users can toggle the no change fees filter when performing a flight search.

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Of course! You can now track prices for flights from Portland to London and get an alert from Cheapflights when they change. Have a valid email address ready and click the bell icon next to the flight deals above to set up your price alerts.

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