Cheapest return flights from Chicago to Lisbon in September from $559

Best time to book flights for Chicago (ORD) to Lisbon (LIS) flights at AirHint

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

Return flights

17 Sep - 30 Sep Turkish Airlines
10 Sep - 20 Sep Turkish Airlines
24 Sep - 08 Oct Turkish Airlines
30 Sep - 05 Oct Turkish Airlines
11 Sep - 19 Sep Turkish Airlines
22 Sep - 29 Sep Turkish Airlines
25 Sep - 05 Oct Turkish Airlines
30 Sep - 15 Oct Turkish Airlines
22 Sep - 06 Oct Turkish Airlines
13 Sep - 21 Sep Turkish Airlines
12 Sep - 21 Sep Turkish Airlines
25 Sep - 05 Oct TAP direct
22 Sep - 29 Sep TAP direct
11 Sep - 19 Sep TAP direct
12 Sep - 21 Sep TAP direct
13 Sep - 21 Sep TAP direct

Also check the deals for one-way 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.

Book a cheap hotel in Lisbon

Cheap car rent in Lisbon