AirHint found the following cheapest return flights from Washington (DCA) to Porto (OPO) in September 2026 (see full year).
Return flights
| 23 Sep - 30 Sep | American Airlines | ||
| 09 Sep - 16 Sep | American Airlines | ||
| 10 Sep - 17 Sep | United | ||
| 11 Sep - 18 Sep | United | ||
| 13 Sep - 20 Sep | Air Canada | ||
| 12 Sep - 19 Sep | American Airlines |
Also check the deals for one-way flights from Washington to Porto in September.
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