Cheapest one-way flights from Chicago to Lisbon in September from $246

AirHint found the following cheapest one-way flights from Chicago (ORD) to Lisbon (LIS) in September 2025 (see full year).

One-Way flights

05 Sep Frontier Airlines
27 Sep Spirit Airlines
06 Sep Spirit Airlines
26 Sep Frontier Airlines
20 Sep Spirit Airlines
27 Sep TAP direct
22 Sep Spirit Airlines
03 Sep Frontier Airlines
13 Sep Spirit Airlines
12 Sep Frontier Airlines

Also check the deals for return flights from Chicago to Lisbon in September.

Skyscanner

The deals are updated regularly. The prices may go up as tickets are purchased by other travellers. Only the cheapest flights are offered. Select a price to book and secure these cheap prices.

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