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

Return flights

30 Jul - 06 Aug	United
31 Jul - 12 Aug	Delta
14 Jul - 02 Aug	jetBlue
12 Jul - 01 Aug	jetBlue
16 Jul - 22 Jul	Frontier Airlines
06 Jul - 17 Jul	jetBlue
07 Jul - 17 Jul	jetBlue
28 Jul - 04 Aug	United
22 Jul - 29 Jul	United
07 Jul - 18 Jul	jetBlue
10 Jul - 27 Jul	jetBlue
26 Jul - 02 Aug	United
15 Jul - 18 Jul	jetBlue
04 Jul - 13 Jul	jetBlue
24 Jul - 31 Jul	United
03 Jul - 12 Jul	jetBlue
14 Jul - 02 Aug	British Airways	direct
12 Jul - 01 Aug	British Airways	direct

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

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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Cheapest return flights from Portland to London in July from $762

Return flights