AirHint found the following cheapest return flights from Chicago (ORD) to Lisbon (LIS) in September 2026 (see full year).
Return flights
| 13 Sep - 24 Sep | Iberia | ||
| 13 Sep - 02 Oct | British Airways | ||
| 13 Sep - 24 Sep | TAP | direct | |
| 13 Sep - 02 Oct | TAP | direct |
Also check the deals for one-way flights from Chicago to Lisbon in September.
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