AirHint found the following cheapest return flights from Portland (PDX) to London (LHR) in December 2026 (see full year).

Return flights

29 Dec - 12 Jan	Air France
30 Dec - 13 Jan	Air France
10 Dec - 24 Dec	Delta
30 Dec - 13 Jan	British Airways	direct
11 Dec - 31 Dec	Alaska Airlines
17 Dec - 31 Dec	Icelandair
14 Dec - 03 Jan	Virgin Atlantic
21 Dec - 03 Jan	Virgin Atlantic
16 Dec - 27 Dec	Air France
18 Dec - 29 Dec	Delta
18 Dec - 31 Dec	Alaska Airlines
18 Dec - 01 Jan	Alaska Airlines
16 Dec - 27 Dec	Iberia	direct
14 Dec - 03 Jan	Finnair	direct
21 Dec - 03 Jan	Iberia	direct
18 Dec - 01 Jan	British Airways	direct

Also check the deals for one-way flights from Portland to London in December.

The deals are updated regularly. The prices may go up as tickets are purchased by other travellers. Only the cheapest flights are offered. Select a price to book and secure these cheap prices.

Book a cheap hotel in London

Cheap car rent in London

Cheapest return flights from Portland to London in December from 564€

Return flights