If you don't mind changing planes, you may want to consider flying to La Crosse (LSE), La Crosse US via Chicago, Minneapolis on American and Northwest.
Go ahead and book your flight to La Crosse NOW!
In order to get the lowest available airfare, book your flight to La Crosse as early as possible, since the cheapest seats are booked months before departure. If you are flexible depart on the first Tuesday of the month, as there are usually some great deals and discount airline tickets on offer.