Cheapest return flights from Washington to London in October from $539

AirHint found the following cheapest return flights from Washington (IAD) to London (LCY) in October 2025 (see full year).

Return flights

21 Oct - 28 Oct SWISS
28 Oct - 05 Nov SWISS
01 Oct - 16 Oct SWISS
07 Oct - 15 Oct SWISS
21 Oct - 18 Nov SWISS
28 Oct - 06 Nov SWISS
01 Oct - 15 Oct SWISS
21 Oct - 31 Oct SWISS
07 Oct - 14 Oct SWISS
07 Oct - 17 Oct SWISS
13 Oct - 20 Oct SWISS
09 Oct - 15 Oct SWISS
16 Oct - 23 Oct SWISS
29 Oct - 14 Nov SWISS
28 Oct - 10 Nov SWISS
31 Oct - 04 Nov SWISS

Also check the deals for one-way flights from Washington to London in October.

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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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