AirHint found the following cheapest return flights from Washington (IAD) to Porto (OPO) in January 2026 (see full year).

Return flights

14 Jan - 19 Jan	Lufthansa
12 Jan - 19 Jan	Brussels Airlines
16 Jan - 19 Jan	Icelandair
19 Jan - 26 Jan	TAP
28 Jan - 04 Feb	TAP
07 Jan - 14 Jan	British Airways
22 Jan - 29 Jan	TAP
25 Jan - 01 Feb	TAP
14 Jan - 21 Jan	TAP
16 Jan - 23 Jan	TAP
31 Jan - 07 Feb	TAP
10 Jan - 17 Jan	TAP
08 Jan - 15 Jan	TAP

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

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 January from $444

Return flights