Cheapest return flights from Chicago to Lisbon in September from $584

AirHint found the following cheapest return flights from Chicago (ORD) to Lisbon (LIS) in September 2026 (see full year).

Return flights

28 Sep - 05 Oct KLM
21 Sep - 28 Sep British Airways
09 Sep - 17 Sep Turkish Airlines
16 Sep - 24 Sep Turkish Airlines
14 Sep - 21 Sep Turkish Airlines
04 Sep - 11 Sep Turkish Airlines
07 Sep - 14 Sep Air France
15 Sep - 15 Oct Delta
03 Sep - 13 Sep Turkish Airlines
18 Sep - 30 Sep Aer Lingus
16 Sep - 24 Sep TAP direct
06 Sep - 27 Sep Aer Lingus
24 Sep - 03 Oct Iberia
24 Sep - 10 Oct Aer Lingus
24 Sep - 10 Oct TAP direct
24 Sep - 03 Oct TAP direct

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

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