We do not have enough data on this route to provide a reliable graph showing how many days before departure it is the best to book.
However, usually the closer it is to the departure, the more expensive the tickets are.
The most popular airlines on the route Chicago O'Hare - Tampa Intl Airport: Frontier Airlines (F9), Spirit Airlines (NK), Delta Airlines (DL).
Direct flights last about 2h 39min.
Direct flights available 2 days a week - Friday, Saturday.
Direct flights: Spirit Airlines (NK), United Airlines (UA).
Chicago (IL) Tampa (FL)