Cheap flights from Portland to London from $337 PDX → LHR, LTN
Portland International Airport (PDX) → London Heathrow Airport (LHR), London Luton Airport (LTN)
The cheapest return found recently is $883 with Icelandair, 5 Sept 2027 – 1 Oct 2027, found 4 days ago. The cheapest one-way found recently is $337 with Icelandair, 8 May 2027, found today.
- Cheapest one-way found recently
- $337, found today
- Cheapest return found recently
- $883, 5 Sept 2027 to 1 Oct 2027
- Cheapest month to fly
- September 2027, return fares from $883 found in the last 7 days
Return
Not enough comparable prices yet for a usual return price.
Cheapest return found recently
$883
5 Sept 2027 – 1 Oct 2027 · Icelandair
Portland International Airport (PDX) → London Heathrow Airport (LHR)
Leaves 3:30 p.m. · Return leaves 1:00 p.m. · 33 h 45 min of travel, both ways together
out 1 stop, back 1 stop
found 4 days ago
Cheapest nonstop return
None seen yet.
Found recently, and the cheapest we hold
$883 5 Sept 2027 – 1 Oct 2027found 4 days agoSee prices for these dates
It is also the cheapest return we hold, of any age.
What have prices looked like?
Over 33 days, 2 Oct to 12 Nov, the cheapest return we saw each day was $826 to $1,339.
Those were the prices on those days, not today's.
Is this a good return price?
Not enough comparable prices yet: we hold return fares on 2 departure dates and need at least 3 to say what is usual.
Could nearby dates be cheaper?
We hold no other 26-night return fares leaving within 3 days of 5 Sept 2027 to compare.
Every date we hold
2 fares on 2 departure dates
See the chart as a table
| Dates | From | Airline | Airports | Stops | Found | |
|---|---|---|---|---|---|---|
| 15 Dec – 21 Dec | $1,103 | United Airlines | Portland International Airport (PDX) → London Heathrow Airport (LHR) | out 1 stop, back 1 stop | found 5 days ago | See prices for these dates |
| 5 Sept 2027 – 1 Oct 2027 | $883 | Icelandair | Portland International Airport (PDX) → London Heathrow Airport (LHR) | out 1 stop, back 1 stop | found 4 days ago | See prices for these dates |
Which month looks cheapest?
September 2027 is the cheapest month — from $883.
Airlines on the cheapest dates: United Airlines, Icelandair.
One-way
The cheapest one-way fare on each of 3 departure dates is usually $339 to $512.
Cheapest one-way found recently
$337
8 May 2027 · Icelandair
Portland International Airport (PDX) → London Heathrow Airport (LHR)
Leaves 3:30 p.m. · 12 h 25 min trip
1 stop
found today
Cheapest nonstop one-way
None seen yet.
Found recently, and the cheapest we hold
$337 8 May 2027found todayOpen this trip
It is also the cheapest one-way we hold, of any age.
What have prices looked like?
Over 20 days, 13 Oct to 12 Nov, the cheapest one-way we saw each day was $431 to $750.
At $337, the cheapest one-way found recently is below that range.
20 days is a short history, so treat this range as an early guide.
Those were the prices on those days, not today's.
Is this a good one-way price?
Compared with the cheapest one-way fare on each of 3 departure dates from 16 Dec to 8 May 2027, found by travelers' searches in the last 7 days (economy, the price the seller showed on Aviasales). The usual range is the middle half of those prices.
Could nearby dates be cheaper?
We hold no other one-way fares leaving within 3 days of 8 May 2027 to compare.
Every date we hold
3 fares on 3 departure dates
See the chart as a table
| Dates | From | Airline | Airports | Stops | Found | |
|---|---|---|---|---|---|---|
| 16 Dec | $683 | Alaska Airlines | Portland International Airport (PDX) → London Luton Airport (LTN) | 3 stops | found 2 days ago | Open this trip |
| 3 May 2027 | $340 | Air Canada | Portland International Airport (PDX) → London Heathrow Airport (LHR) | 1 stop | found today | Open this trip |
| 8 May 2027 | $337 | Icelandair | Portland International Airport (PDX) → London Heathrow Airport (LHR) | 1 stop | found today | Open this trip |
Which month looks cheapest?
May 2027 is the cheapest month — from $337.
Airlines on the cheapest dates: Alaska Airlines, Air Canada, Icelandair.
Premium cabin fares from Portland to London
We hold no premium economy, business or first-class fares for this route: we collect them for the busiest routes, and this one is not among them yet.
Today's prices for 5 Sept 2027 – 1 Oct 2027 in another cabin: Premium economy · Business · First
Today's prices for 8 May 2027 in another cabin: Premium economy · Business · First
How far ahead were prices cheapest for Portland to London?
Return
Fares 90 to 179 days before departure were typically 25% lower than 30 to 59 days before departure.
From the cheapest return each day between 2 Oct and 12 Nov (33 days), grouped by how many days ahead the flight left; one adult in economy.
Each range covers different departure dates, so this compares typical fares, not the same trip priced twice.
Prices reflect recent searches — current fares may differ.
See these ranges as a table
| Booked ahead by | Typical fare | Cheapest day | Above the cheapest | Days of prices |
|---|---|---|---|---|
| 30–59 days | $1,103 | $914 | +34% | 8 |
| 90–179 days | $826 | $826 | Cheapest seen | 8 |
| 180+ days | $883 | $875 | +7% | 19 |
One-way
Not enough history yet: in 20 days of one-way prices, 13 Oct to 12 Nov, fewer than 3 booking ranges had prices on 7 days or more.
Live price for these dates
The cheapest return found recently is for 5 Sept 2027 – 1 Oct 2027. A live search on this page shows what those dates cost now, for one adult in economy.
Questions about this trip
How much is a return flight from Portland to London?
The cheapest return found recently is $883 with Icelandair, 5 Sept 2027 to 1 Oct 2027, found 4 days ago.
How much is a one-way flight from Portland to London?
The cheapest one-way found recently is $337 with Icelandair, 8 May 2027, found today. The cheapest one-way fare on each of 3 departure dates is usually $339 to $512.
What is the cheapest month to fly from Portland to London?
September 2027 is the cheapest month for a return, from $883, 5 Sept 2027 to 1 Oct 2027, found 4 days ago. May 2027 is the cheapest month for a one-way, from $337, 8 May 2027, found today.
How far ahead should I book a flight from Portland to London?
In 33 days of prices between 2 Oct and 12 Nov, return fares 90 to 179 days before departure were typically 25% lower than 30 to 59 days before departure.
How long is the flight from Portland to London?
The cheapest one-way found recently, with Icelandair on 8 May 2027, takes 12 h 25 min with 1 stop.
Which airlines have the cheapest flights from Portland to London?
Between 16 Dec and 8 May 2027, Alaska Airlines has the cheapest one-way on 1 of the 3 departure dates we hold, Air Canada on 1 and Icelandair on 1.
Prices are what travelers' searches on Aviasales found in the last 7 days, in US dollars: the price the seller showed on Aviasales; bags may cost extra. Fares change, so check today's price before you book. How our prices work