Cheapest return flights from Chicago to Lisbon in May from 600€

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

Return flights

03 May - 13 May Delta
11 May - 19 May Iberia
25 May - 01 Jun Air Canada
26 May - 02 Jun Air Canada
30 May - 06 Jun Air Canada
03 May - 13 May TAP direct
09 May - 17 May Aer Lingus
02 May - 17 May Delta
18 May - 25 May KLM
28 May - 04 Jun Air Canada
29 May - 05 Jun Air Canada
31 May - 07 Jun Air Canada
08 May - 17 May Delta
16 May - 27 May Spirit Airlines
17 May - 29 May Icelandair
25 May - 11 Jun British Airways
21 May - 28 May WestJet
27 May - 06 Jun Spirit Airlines
28 May - 07 Jun Spirit Airlines
23 May - 01 Jun WestJet

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

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