Frontier does lower the fares slightly closer to the date of travel. Perhaps 2-3 weeks can be the optimal time. Actually it happened to me that I overpaid by $15 as the fare went down three days after I had booked it. However, for Chicago, like TTN-MDW it rarely becomes cheaper closer to date of travel especially on Thursday, Friday and Sunday.

I also know it prices the far out (maybe 3 months out) schedules sometimes on the high side, maybe it gauges the demand, as it gives it flexibility to move flights around, delete flights, and not have too many pax it has to re-book or send cancellations out.

Then it sends out very short lasting promo codes when it needs an uptick in ticket sales.

The one Florida market that's interesting is PBI to me as Southwest doesn't fly MDW-PBI and it might be an opportunity for Frontier out in MDW. AA does offer ORD-PBI but I wonder if AA would bother matching Frontier. DTW-PBI is also exclusively Delta and high fares. Delta hasn't reacted to CLE-ATL by Frontier, so maybe DTW-PBI would be an opportunity for Frontier. These along with TTN, IAD and maybe CLE although it might dilute it's own sales for FLL from these markets.

MDW-Florida fares are much higher than Philly-Florida. Chicago and Detroit actually have it worse for a Florida getaway than from the Mid-Atlantic up to Boston for a Florida getaway. Maybe MKE and FNT are cheaper but the primary airports have less competition or somehow high fares even on Spirit which is lousy service.

Even PVD which is the same distance to Florida will have much lower fares than MDW/ORD to Florida.

PHL-MCO on Southwest is still very high frequency, along with on US. The demand to MCO must be strong year-round. The market should be large enough for ILG-MCO and TTN-MCO from Frontier, and Spirit's flights out in ACY. Frontier deleted ABE-MCO to fund TTN-MCO, but ABE-MCO was a route that didn't show weakness by AirTran as AirTran flew it right until Southwest bought it out and closed the entire station. I wonder if Frontier would have interest in re-instating this "suspended" route. Frontier competes against Allegiant in MDT, and Allegiant is the sole low cost carrier for ABE since Frontier left.