Deal found on September 9, 2026
St. Louis to Denver
$88$35775% off
Round trip
Denver nonstop out of St. Louis is running $88 right now, well under the usual $360 fare on this route and just above the all time low of $56. Frontier has seats open for trips through the fall and winter, good for a quick mountain getaway or a cheap connection west. It is one of the sharper drops we have tracked on any STL route in months.
Travel dates
Dates in October
e.g. Oct 17 – Oct 26 · 9 nights
Date options
6 at this price
Lowest we've seen
$56
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