AirHint found the following cheapest return flights from Seattle (SEA) to Porto (OPO) in March 2026 (see full year).
Return flights
| 04 Mar - 11 Mar | Air France | ||
| 05 Mar - 13 Mar | Delta | ||
| 22 Mar - 03 Apr | Delta | ||
| 13 Mar - 23 Mar | British Airways | ||
| 13 Mar - 20 Mar | Turkish Airlines |
Also check the deals for one-way flights from Seattle to Porto in March.
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