Cheapest return flights from Portland to London in August from $553

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 August 2025 (see full year).

Return flights

23 Aug - 09 Sep Icelandair
25 Aug - 09 Sep Icelandair
23 Aug - 30 Aug Icelandair
27 Aug - 08 Sep Icelandair
25 Aug - 09 Sep American Airlines direct
16 Aug - 05 Sep United
28 Aug - 04 Sep Icelandair
18 Aug - 25 Aug British Airways direct
23 Aug - 09 Sep American Airlines direct
08 Aug - 15 Aug British Airways
01 Aug - 13 Aug Finnair
28 Aug - 04 Sep British Airways direct
23 Aug - 30 Aug British Airways direct
14 Aug - 17 Aug American Airlines
05 Aug - 12 Aug British Airways
02 Aug - 09 Aug United

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

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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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