United Flight UA4509 Deals & Information (2025/2026)

UA4509 is used on multiple routes, but the most common is between O’Hare Airport and Knoxville, TN Airport (TYS-McGhee Tyson). If you manage to score a direct flight, you’ll step off the plane in around 1 hour and 41 minutes. Multi-stop flights can also operate under this number, as can flights on other routes.

If you’re booked on a flight from ORD, you’ll likely board from Terminal 1. The most frequented route for UA4509 is O’Hare Airport to TYS, which is a direct flight.

If you’ve booked a ticket on flight UA4509 from Chicago, IL Airport (ORD-O’Hare Intl.) to TYS, chances are you’ll be traveling on a Canadair (Bombardier) Regional Jet 550. This flight number serves more than one route, but this is the most popular.

For more info about changing your UA4509 flight with Travelocity, please visit our Customer Service Portal.