Out of Chicago, Midway is just as far for us as O'Hare and the flights generally run more on time out of Midway due to many fewer flights.
Even before allowing for the check bag fee, Southwest is cheaper. Also, I decided to change my flight about 3 weeks out and since the alternative flight was the same airfare as my original flight, it cost me $0.
I would love to try Jet Blue, but I would have to connect through JFK and make the trip from 2.5 hours direct on Southwest to 6 hours connecting on Jet Blue. I'll take the 2.5 hours direct.
Dolby1000