Fly from Chicago to Lisbon for $436 round-trip on United/TAP Portugal.
Seen below, we found seats departing ORD on Monday, October 1, returning from LIS on Thursday, October 11.
Other dates are also available for travel from late September through early December.
See our Chicago ORD fare listings for a complete look at current finds.
Need a room in Lisbon? Here's what's available for the above dates on Hotelwatchdog.