Cheapest return flights from Portland to London in May from $671

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

Return flights

12 May - 06 Jun Icelandair
12 May - 24 May Lufthansa
20 May - 27 May Icelandair
01 May - 31 May British Airways
09 May - 24 May American Airlines direct
12 May - 06 Jun British Airways direct
05 May - 12 May Icelandair
30 May - 20 Jun British Airways direct
01 May - 31 May British Airways direct
30 May - 06 Jun Icelandair

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

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