The cost of your flight to Louisville, Kentucky will depend on where you are flying from, and what time of year you are flying. I have always used Orbitz and Priceline to get great deals on flights. If you fly during the holiday season, your flight is more than likely to cost you more.
Your best bet is to look online for cheap flights that offer discounts. Also some credit card companies give you benefits when you purchase your tickets on your credit card. Currently as of February 02, 2011, Orbitz has a deal gong from CA to Louisville, KY for $637.00 with one stop in-between, this is for a round-trip flight.
Again it will depend on where you depart from, but as mentioned, look on the above mentioned discount sites, they should provide you with a place to start. Good luck and have a safe flight.
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