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

Return flights

29 Oct - 11 Nov	Aer Lingus
28 Oct - 04 Nov	Aer Lingus
29 Oct - 05 Nov	Aer Lingus
29 Oct - 04 Nov	Aer Lingus
28 Oct - 11 Nov	Aer Lingus
27 Oct - 06 Nov	Delta
26 Oct - 04 Nov	Delta
26 Oct - 04 Nov	Delta	direct
29 Oct - 11 Nov	British Airways	direct
28 Oct - 22 Nov	Aer Lingus
24 Oct - 29 Oct	Air Canada
23 Oct - 30 Oct	Air France
24 Oct - 31 Oct	Air France
23 Oct - 28 Oct	Delta
23 Oct - 29 Oct	Virgin Atlantic
26 Oct - 29 Oct	Lufthansa
23 Oct - 30 Oct	Air France	direct
24 Oct - 31 Oct	Air France	direct
23 Oct - 28 Oct	Air France	direct
23 Oct - 29 Oct	Delta	direct

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 $554

Return flights