AirHint found the following cheapest return flights from Seattle (SEA) to Porto (OPO) in April 2026 (see full year).
Return flights
| 07 Apr - 14 Apr | Air France | ||
| 15 Apr - 22 Apr | KLM | ||
| 08 Apr - 15 Apr | Delta | ||
| 16 Apr - 23 Apr | KLM | ||
| 09 Apr - 16 Apr | Air France | ||
| 18 Apr - 25 Apr | British Airways | ||
| 17 Apr - 24 Apr | KLM |
Also check the deals for one-way flights from Seattle to Porto in April.
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