AirHint found the following cheapest return flights from Chicago (ORD) to Lisbon (LIS) in October 2026 (see full year).
Return flights
| 06 Oct - 14 Oct | Delta | ||
| 05 Oct - 14 Oct | Delta | ||
| 08 Oct - 15 Oct | TAP | direct | |
| 14 Oct - 21 Oct | TAP | direct | |
| 09 Oct - 17 Oct | Finnair | ||
| 09 Oct - 16 Oct | TAP | direct | |
| 09 Oct - 17 Oct | TAP | direct |
Also check the deals for one-way flights from Chicago to Lisbon in October.
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