AirHint found the following cheapest return flights from Baltimore (BWI) to Porto (OPO) in May 2026 (see full year).
Return flights
| 10 May - 17 May | Icelandair | ||
| 29 May - 04 Jun | Icelandair | ||
| 30 May - 05 Jun | Spirit Airlines | ||
| 12 May - 21 May | British Airways | ||
| 19 May - 23 May | Icelandair | ||
| 20 May - 23 May | Delta | ||
| 14 May - 22 May | British Airways |
Also check the deals for one-way flights from Baltimore to Porto in May.
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