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

Return flights

17 Nov - 24 Nov	Air Canada
24 Nov - 01 Dec	Air Canada
12 Nov - 19 Nov	Lufthansa
25 Nov - 02 Dec	SWISS
26 Nov - 03 Dec	British Airways
11 Nov - 18 Nov	Air France
18 Nov - 25 Nov	KLM
19 Nov - 26 Nov	Lufthansa
27 Nov - 04 Dec	Air Canada
13 Nov - 20 Nov	SWISS
16 Nov - 23 Nov	British Airways
30 Nov - 07 Dec	SWISS
14 Nov - 21 Nov	Air Canada
10 Nov - 17 Nov	Air Canada
28 Nov - 05 Dec	Lufthansa
11 Nov - 06 Dec	Lufthansa
12 Nov - 06 Dec	United
15 Nov - 22 Nov	TAP
29 Nov - 06 Dec	TAP
26 Nov - 20 Dec	British Airways

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

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 November from 361€

Return flights