Route Price Intelligence
Cheap Flights From St. Louis to Denver
Live pricing benchmarks, monthly patterns, and historical lows for this route.
Nonstop Frontier fares from St. Louis to Denver just fell to $84, about 77% below the usual $368 price tag on this route. That's one of the steepest discounts we've seen this week, part of a wider Frontier sale hitting multiple cities. With Colorado's ski resorts opening for the season, this is a cheap way to get to the mountains this winter.
✓ 14 date combinations found at this price
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Best Time to Fly from St. Louis to Denver
The cheapest time to fly from St. Louis to Denver is typically December, when fares average around $157. The most expensive month tends to be March at around $373. For the best deals, consider flying in December, January, February.
Typical Price by Travel Month
Median round-trip fare for each month, with the typical price range, from our ongoing tracking of this route