AirHint found the following cheapest one-way flights from Chicago (ORD) to Lisbon (LIS) in April 2026 (see full year).
One-Way flights
| 26 Apr | Icelandair | ||
| 14 Apr | Frontier Airlines | ||
| 29 Apr | Frontier Airlines | ||
| 03 Apr | Icelandair | ||
| 17 Apr | Spirit Airlines | ||
| 16 Apr | Spirit Airlines | ||
| 01 Apr | Spirit Airlines | ||
| 12 Apr | SWISS | ||
| 07 Apr | SWISS | ||
| 22 Apr | SWISS |
Also check the deals for return flights from Chicago to Lisbon in April.
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