AirHint found the following cheapest return flights from Washington (DCA) to Porto (OPO) in June 2026 (see full year).
Return flights
| 06 Jun - 27 Jun | Air Canada | ||
| 20 Jun - 29 Jun | United | ||
| 14 Jun - 04 Jul | United | ||
| 12 Jun - 04 Jul | TAP |
Also check the deals for one-way flights from Washington to Porto in June.
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