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

Return flights

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

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 $446

Return flights