Fares are only valid on Tuesdays, Wednesdays, and Saturdays. For flights to Florida and Nevada, the lowest fares are only valid on Tuesdays and Wednesdays. Those wanting to travel to San Juan, Puerto Rico for the lowest cost flights must go between Mondays and Thursdays. The best fares for international flights are only valid on Tuesdays and Wednesdays.
The flights must be taken between Aug. 23 through Dec. 14 and for international flights between Aug. 23 through Dec. 13. The low rates are only valid to San Juan, Puerto Rico between Sept. 7 through Dec. 8.
Prices start to rise as mileage increases. For flights to the west coast like Los Angeles, San Francisco, and Phoenix all go for $129 out of Chicago. For those seeking vacations in Cancun, Mexico, one-way flights out of Chicago start at $179. Rates seem to abide by mileage markers.