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

Return flights

27 Jul - 12 Aug	British Airways	direct
27 Jul - 13 Aug	Delta
27 Jul - 13 Aug	British Airways	direct
29 Jul - 06 Aug	Delta
28 Jul - 05 Aug	Virgin Atlantic
29 Jul - 06 Aug	British Airways	direct
28 Jul - 05 Aug	British Airways	direct
25 Jul - 01 Aug	Virgin Atlantic
29 Jul - 04 Aug	Hawaiian Airlines
22 Jul - 28 Jul	Brussels Airlines
29 Jul - 04 Aug	British Airways	direct
22 Jul - 28 Jul	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 473€

Return flights