Please Note:
Allegiant flights can only be booked through the Allegiant website. Please click here to book now.

If you have a problem with our online booking engine or have a question about your online reservation, please call 888-789-9887 or email OnPeak at

This is a toll-free customer service support number and will direct you to a booking agent.



  • Non-stop service to Orlando Sanford Airport (SFB).
  • Non-stop service to Tampa through Clearwater-St. Petersburg International Airport (PIE).
  • 1-702-505-8888
  • Non-stop daily service to Charlotte (CLT) through Charlotte Douglas International Airport
  • 1-800-433-7300
  • Non-stop daily service to Atlanta (ATL) through Hartsfield Jackson International Airport
  • 1-800-221-1212

Airline Information

Tri-Cities Airport offers non-stop service to four hubs. With one connection you can get most anywhere in the United States and many destinations abroad. Each airline’s contact information is listed above or click on the airline name to visit each website. You can also follow TRI on FacebookTwitter, or Instagram for the latest Airport news.