The length of a direct flight to Western United States varies, but here you can check out the average travel times for some popular routes: Denver, CO (DEN-Denver Intl.) to Salt Lake City Intl. Airport (SLC) - 1 hour and 34 minutes Los Angeles, CA (LAX-Los Angeles Intl.) to Salt Lake City Intl. Airport (SLC) - 1 hour and 50 minutes Dallas, TX (DFW-Dallas-Fort Worth Intl.) to Salt Lake City Intl. Airport (SLC) - 2 hours and 45 minutes