AirHint found the following cheapest return flights from Washington (DCA) to Porto (OPO) in December 2025 (see full year).
Return flights
| 06 Dec - 13 Dec | Delta | ||
| 05 Dec - 08 Dec | TAP | ||
| 05 Dec - 18 Dec | TAP | ||
| 23 Dec - 17 Jan | Iberia | ||
| 27 Dec - 10 Jan | Air Canada | ||
| 27 Dec - 04 Jan | Air Canada | ||
| 23 Dec - 30 Dec | Air France | ||
| 23 Dec - 28 Dec | TAP |
Also check the deals for one-way flights from Washington to Porto in December.
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