AirHint found the following cheapest one-way flights from Houston (IAH) to Porto (OPO) in March 2026 (see full year).
One-Way flights
| 31 Mar | United | ||
| 25 Mar | Air France | ||
| 29 Mar | Air France | ||
| 30 Mar | Air France | ||
| 14 Mar | British Airways | ||
| 26 Mar | Delta |
Also check the deals for return flights from Houston to Porto in March.
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