AirHint found the following cheapest return flights from Washington (DCA) to Porto (OPO) in April 2026 (see full year).
Return flights
| 30 Apr - 07 May | Iberia | ||
| 22 Apr - 13 May | Delta | ||
| 22 Apr - 06 May | United | ||
| 02 Apr - 06 Apr | jetBlue |
Also check the deals for one-way flights from Washington to Porto in April.
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