Cheapest return flights from Portland (PDX) to London (LHR), September

Select a price to book. see full year.

Dates, airline, and price
Dates Airline Price
06 Sep 16 Sep Alaska Airlines
26 Sep 01 Oct Alaska Airlines
07 Sep 14 Sep Virgin Atlantic
16 Sep 30 Sep Delta
15 Sep 06 Oct Delta
15 Sep 08 Oct Delta
25 Sep 29 Sep Alaska Airlines
13 Sep 20 Sep Scandinavian Airlines
04 Sep 17 Sep Delta
10 Sep 21 Sep Virgin Atlantic
10 Sep 23 Sep Alaska Airlines
30 Sep 11 Oct Iberia
12 Sep 20 Sep Virgin Atlantic
17 Sep 20 Sep Scandinavian Airlines
15 Sep 06 Oct Finnair
Direct Flight
Powered by

deals for one-way flights from Portland to London in September.

Book a cheap hotel in London

Cheap car rent in Heathrow

Updated Sep 3, 2026.

About these fares

These results come from our latest search across airlines for your currency. Prices change quickly and are not locked until you complete booking—always confirm the total and fare rules on the partner site.

Feel free to contact us with any feedback or request another flight research.