Air
- Companies:Delta Airlines, Southwest Airlines
 - Duration:Approximately 6 hours (includes layovers)
 - Distance:1,350 miles (2,174 kilometers)
 - Costs: €250 - €350 (varies based on booking time and season)
 - Roads/Routes: Not applicable
 
Pro Tip: Book your flight in advance to secure better rates and consider flying mid-week for potentially lower prices.
Road
- Companies: National Car Rental, Enterprise Rent-A-Car
 - Duration: Approximately 21 hours of driving time
 - Distance: 1,450 miles (2,333 kilometers)
 - Costs: €150 (car rental) + €300 (fuel) + €30 (tolls) = €480 total (estimation)
 - Roads/Routes: I-15 S, I-40 E
 
Pro Tip: Consider a scenic detour through the Smoky Mountains along I-40; it's a beautiful and relaxing way to break the long drive.
Train & Bus Combined
- Companies: Amtrak (Train), Greyhound (Bus)
 - Duration: Approximately 25 hours including transfers
 - Distance: 1,350 miles (2,174 kilometers)
 - Costs: €100 (Amtrak) + €80 (Greyhound) = €180 total
 - Roads/Routes: Not applicable
 
Pro Tip: Purchase a combined ticket for both train and bus segments to save money and ensure smoother transfers.
Comprehensive Recommendation
For the most efficient and comfortable journey from St. George, UT to Clarksville, TN, I recommend traveling by air, taking Delta or Southwest Airlines. The total travel duration is about 6 hours, and while it may seem more expensive than driving, the significant time savings make it worthwhile. The journey will cover approximately 1,350 miles, with costs ranging from €250 to €350 depending on the time of booking. Always check for any travel advisories that may affect your journey. Enjoy your trip!