Cheapest return flights from Chicago to Lisbon in September from $539

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

22 Sep - 02 Oct Finnair
17 Sep - 24 Sep Finnair
25 Sep - 02 Oct Finnair
10 Sep - 24 Oct Turkish Airlines
15 Sep - 25 Sep Turkish Airlines
08 Sep - 17 Sep Turkish Airlines
22 Sep - 02 Oct TAP direct
16 Sep - 23 Sep Finnair
13 Sep - 20 Sep Turkish Airlines
18 Sep - 25 Sep Turkish Airlines
14 Sep - 22 Sep British Airways
20 Sep - 27 Sep Finnair
15 Sep - 25 Sep TAP direct
11 Sep - 25 Oct Turkish Airlines
12 Sep - 19 Sep Turkish Airlines
11 Sep - 25 Oct TAP direct

Also check the deals for one-way flights from Chicago to Lisbon in September.

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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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