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Cheap flights from Portland to London from £178

PDX — LON
11 Oct — 18 Oct1
1 adult
1 adult, Economy, 0 bags
Cheapflights Tip: The best prices from Portland to London are usually found in January or November, booked 16 days in advance, depart on a Monday or Thursday and return on a Friday

Cheap flight deals from Portland to London

Enter your travel dates to find the best prices.

Cheapest flights from Portland to London

Sun 27/1217:45 -
Nonstop9h 35m
Sat 23/111:15 -
1 stop19h 00m
Deal found 10/9£666
Thu 26/1114:45 -
1 stop12h 05m
Tue 1/1207:50 -
2 stops33h 56m
Deal found 6/9£669
Thu 15/1015:30 -
2 stops23h 25m
Mon 2/1108:05 -
1 stop16h 55m
Deal found 6/9£669
Wed 21/1015:30 -
2 stops16h 50m
Tue 3/1119:30 -
3 stops29h 30m
Deal found 6/9£669
Thu 15/1015:30 -
2 stops21h 00m
Mon 2/1108:00 -
1 stop17h 00m
Deal found 6/9£669
Mon 5/1013:12 -
1 stop13h 38m
Tue 20/1015:40 -
Nonstop10h 00m
Deal found 6/9£669
Tue 10/1107:00 -
2 stops18h 15m
Mon 16/1109:50 -
2 stops19h 23m
Deal found 10/9£669
Mon 26/1015:45 -
1 stop12h 10m
Fri 30/1011:55 -
1 stop13h 05m
Deal found 7/9£669
Thu 26/1114:45 -
1 stop12h 05m
Sun 6/1214:50 -
2 stops37h 58m
Deal found 6/9£670
Thu 1/1015:30 -
2 stops25h 00m
Sun 1/1106:30 -
2 stops18h 30m
Deal found 11/9£670
Sat 24/1015:30 -
1 stop15h 10m
Sun 1/1111:55 -
1 stop13h 05m
Deal found 10/9£670
Mon 9/1114:45 -
1 stop12h 05m
Tue 17/1107:50 -
2 stops20h 57m
Deal found 6/9£671

Find flight deals from Portland to London

Round-trip from

£666

One-way from

£178

Popular in

July

Cheapest in

January

Average price

£719
Iberia
  • Iberia
  • 27/12-23/1
  • 1 total stop
  • 28h 35m total
  • Portland to London
Search Deals
1/10-31/12
  • 1/10-31/12
  • 2 total stops
  • 25h 00m total
  • Portland to London
Search Deals
Highest demand for flights based on searches. 19% potential increase in price (£119 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 September 2026
Search Deals

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 - STN London Stansted

PDXSTN

Portland

Mon 19/10

15:30-16:50

2 stops17h 20m

London Stansted

Wed 31/12

00:00-15:00

Nonstop0h 00m

£182

PortlandLondon

PDX Portland - LTN London Luton

PDXLTN

Portland

Thu 1/10

15:30-12:40

3 stops37h 10m

London Luton

Wed 31/12

00:00-15:00

Nonstop0h 00m

£200

PortlandLondon

PDX Portland - STN London Stansted

PDXSTN

Portland

Mon 12/10

15:30-18:50

2 stops19h 20m

London Stansted

Wed 31/12

00:00-15:00

Nonstop0h 00m

£200

PortlandLondon

PDX Portland - LGW London Gatwick

PDXLGW

Portland

Mon 19/10

15:30-08:20

3 stops32h 50m

London Gatwick

Wed 31/12

00:00-15:00

Nonstop0h 00m

£204

PortlandLondon

PDX Portland - SEN London Southend

PDXSEN

Portland

Mon 19/10

15:30-16:10

3 stops40h 40m

London Southend

Wed 31/12

00:00-15:00

Nonstop0h 00m

£215

PortlandLondon

PDX Portland - STN London Stansted

PDXSTN

Portland

Thu 22/10

15:30-23:50

3 stops24h 20m

London Stansted

Wed 31/12

00:00-15:00

Nonstop0h 00m

£231

PortlandLondon

PDX Portland - LGW London Gatwick

PDXLGW

Portland

Mon 1/3

14:45-10:55

1 stop12h 10m

London Gatwick

Wed 31/12

00:00-15:00

Nonstop0h 00m

£239

PortlandLondon

PDX Portland - LHR London Heathrow

PDXLHR

Portland

Wed 18/11

07:08-12:20

1 stop21h 12m

London Heathrow

Wed 31/12

00:00-15:00

Nonstop0h 00m

£243

PortlandLondon

PDX Portland - LHR London Heathrow

PDXLHR

Portland

Tue 12/1

09:31-12:20

1 stop18h 49m

London Heathrow

Wed 31/12

00:00-15:00

Nonstop0h 00m

£243

PortlandLondon

PDX Portland - LHR London Heathrow

PDXLHR

Portland

Wed 2/12

11:57-12:20

1 stop16h 23m

London Heathrow

Wed 31/12

00:00-15:00

Nonstop0h 00m

£243

Flights are sorted by cheapest return flights first.

Deals found on 9/9

Showing 1-10 of 60 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, February is the cheapest month in which you can book a flight from Portland to London (average of £531). Flying from Portland to London in July is currently the most expensive (average of £941). 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.

Weekly flight availability from Portland to London

The most flights from PDX to LON are scheduled on a Monday (7 on average). You will have fewer flight options on Monday, which is when the least amount of flights are scheduled (7 on average).

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 £625 and £786 in December.
The cheapest return price found within the last 5 days was £666 on Iberia (27 Dec–23 Jan).

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

Reykjavik (KEF) – chosen by Cheapflights users on 56% 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 £583.

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 89 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 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.
British Airways
6.7
Okay
8,211 reviews
Check prices

Entertainment

6.5

Boarding

7.0

Crew

7.7

Food

6.4

Overall

6.7

Comfort

6.8

Reviews

1 / 20
10.0
Excellent

Anonymous,Jun 2026

IAH - LHR

Airline was good the flight attendant were very helpful and kind. The problem I had is with cheap tickets, my ticket was not allowed one check in baggage this was new to me. I do a lot of traveling overseas and 1 check in baggage is always allowed. Also I bought insurance for my ticket it proved to be useless. I have called several times and spoke to your customer service, not one single person mentioned it to me that baggage was not allowed. All this additional expense was too much for me. I even asked one of your customer service representative I need to buy extra baggage should I buy it now and he told me when you receive check in information you can buy it @ that time never mentioned it to me that my ticket didn’t include baggage. It was very frustrating. I will never use cheap ticket again.
British Airways
6.7
Okay
8,211 reviews
British Airways
6.7
Okay
8,211 reviews
Check prices

Entertainment

6.5

Boarding

7.0

Crew

7.7

Food

6.4

Overall

6.7

Comfort

6.8

Reviews

1 / 20
10.0
Excellent

Anonymous,Jun 2026

IAH - LHR

Airline was good the flight attendant were very helpful and kind. The problem I had is with cheap tickets, my ticket was not allowed one check in baggage this was new to me. I do a lot of traveling overseas and 1 check in baggage is always allowed. Also I bought insurance for my ticket it proved to be useless. I have called several times and spoke to your customer service, not one single person mentioned it to me that baggage was not allowed. All this additional expense was too much for me. I even asked one of your customer service representative I need to buy extra baggage should I buy it now and he told me when you receive check in information you can buy it @ that time never mentioned it to me that my ticket didn’t include baggage. It was very frustrating. I will never use cheap ticket again.

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 7 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 £727, SWISS can have you in London from Portland in 12h 40m. The distance between Portland and London is about 4896 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 £455. British Airways is 32% 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 (88%), Alaska Airlines (88%) and Aer Lingus (88%).

  • 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, February is the cheapest month in which you can book a flight from Portland to London (average of £531). Flying from Portland to London in July is currently the most expensive (average of £941). 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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Browse thousands of different options on Cheapflights for your next trip

Top airline flying from Portland to London

AirlineCheapestAverageFlexibilityOn-time
British AirwaysCheapest£455Average£821FlexibilityNo cancel feeOn-time70%
Search British Airways flights

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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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