AirHint found the following cheapest return flights from Washington (DCA) to Porto (OPO) in December 2025 (see full year).
Return flights
| 23 Dec - 17 Jan | Iberia | ||
| 24 Dec - 01 Jan | jetBlue | ||
| 12 Dec - 21 Dec | British Airways | ||
| 19 Dec - 04 Jan | jetBlue | ||
| 23 Dec - 31 Dec | Iberia | ||
| 08 Dec - 03 Jan | British Airways |
Also check the deals for one-way flights from Washington to Porto in December.
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