Cheapest return flights from Portland to London in May from 710€

Best time to book flights for Portland (PDX) to London (LHR) flights at AirHint

AirHint found the following cheapest return flights from Portland (PDX) to London (LHR) in May 2025 (see full year).

Return flights

01 May - 08 May United
12 May - 21 May Air Canada
12 May - 21 May British Airways direct
13 May - 03 Jun Air Canada
19 May - 28 May Air Canada
19 May - 28 May British Airways direct
13 May - 03 Jun British Airways direct
23 May - 03 Jun Icelandair
25 May - 20 Jun Icelandair
22 May - 29 May Air Canada
25 May - 20 Jun British Airways direct
23 May - 03 Jun British Airways direct
22 May - 29 May British Airways direct
24 May - 26 May Alaska Airlines
24 May - 26 May British Airways direct

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

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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.

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