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

Return flights

08 Oct - 15 Oct	Air Canada
22 Oct - 28 Oct	Air Canada
22 Oct - 30 Oct	Air Canada
01 Oct - 08 Oct	Air Canada
13 Oct - 21 Oct	Air Canada
07 Oct - 17 Oct	Air Canada
12 Oct - 21 Oct	Air Canada
08 Oct - 31 Oct	Air Canada
07 Oct - 15 Oct	Air Canada
14 Oct - 21 Oct	Air Canada
21 Oct - 04 Nov	Air Canada
27 Oct - 06 Nov	Air Canada
17 Oct - 08 Nov	jetBlue
16 Oct - 08 Nov	jetBlue
21 Oct - 18 Nov	British Airways
15 Oct - 08 Nov	Air Canada
28 Oct - 03 Nov	Air Canada
23 Oct - 11 Nov	Air Canada
14 Oct - 08 Nov	Air Canada
30 Oct - 06 Nov	Air Canada

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

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.

Book a cheap hotel in London

Cheap car rent in London

Cheapest return flights from Washington to London in October from $583

Return flights