AirHint found the following cheapest one-way flights from Detroit (DTW) to Porto (OPO) in May 2026 (see full year).
One-Way flights
| 05 May | Lufthansa | ||
| 02 May | SWISS | ||
| 03 May | Delta | ||
| 04 May | Delta | ||
| 06 May | Delta | ||
| 07 May | Air France | ||
| 10 May | Lufthansa | ||
| 13 May | Lufthansa | ||
| 11 May | Delta | ||
| 12 May | Delta |
Also check the deals for return flights from Detroit to Porto in May.
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