AirHint found the following cheapest one-way flights from Chicago (ORD) to Porto (OPO) in March 2026 (see full year).
One-Way flights
| 03 Mar | Icelandair | ||
| 14 Mar | Spirit Airlines | ||
| 13 Mar | Spirit Airlines | ||
| 27 Mar | Turkish Airlines |
Also check the deals for return flights from Chicago to Porto in March.
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