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

Return flights

29 Oct - 05 Nov	Lufthansa
28 Oct - 04 Nov	Austrian Airlines
27 Oct - 03 Nov	British Airways
14 Oct - 21 Oct	Air Canada
21 Oct - 15 Nov	Austrian Airlines
30 Oct - 06 Nov	Lufthansa
31 Oct - 07 Nov	Lufthansa
15 Oct - 22 Oct	SWISS
22 Oct - 29 Oct	Air Canada
13 Oct - 20 Oct	Air Canada
20 Oct - 27 Oct	Lufthansa
07 Oct - 14 Oct	Air Canada
21 Oct - 28 Oct	Austrian Airlines
18 Oct - 08 Nov	SWISS
24 Oct - 31 Oct	Lufthansa
25 Oct - 01 Nov	Lufthansa
26 Oct - 02 Nov	KLM
22 Oct - 15 Nov	United
06 Oct - 13 Oct	Air Canada
08 Oct - 15 Oct	SWISS

Also check the deals for one-way flights from Washington to Porto 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.

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Cheapest return flights from Washington to Porto in October from 362€

Return flights