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

Return flights

04 Jun - 08 Jun	TAP
07 Jun - 14 Jun	TAP
01 Jun - 08 Jun	TAP
10 Jun - 15 Jun	British Airways
17 Jun - 19 Jun	British Airways
23 Jun - 07 Jul	Lufthansa
11 Jun - 18 Jun	TAP
18 Jun - 22 Jun	British Airways
14 Jun - 21 Jun	Lufthansa
26 Jun - 03 Jul	TAP
06 Jun - 13 Jun	TAP
16 Jun - 23 Jun	TAP

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

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 June from $645

Return flights