Route Price Intelligence
Cheap Flights From St. Louis to Denver
Live pricing benchmarks, monthly patterns, and historical lows for this route.
⭐ Great DealFound 1d ago
$209Frontier is running a Denver sale and STL is included — $209 nonstop, 42% below the usual fare on this route. No blackout dates flagged, so grab it while it lasts.
✓ 17 date combinations found at this price
Search Google FlightsTypical Price
$357
Deals From
$114
Usually Costs
$114 – $367
Lowest We've Seen
$56
Based on 328 price pointshigh confidence
Monthly Price Guide
Jan
$367
Feb
$357
Mar
$412
Apr
$201
May
$179
Jun
$204
Jul
$218
Aug
$208
Sep
$357
Oct
$358
Nov
$367
Dec
$368
Cheapest Average Expensive
Best Time to Fly from St. Louis to Denver
The cheapest time to fly from St. Louis to Denver is typically May, when fares average around $179. The most expensive month tends to be March at around $412. For the best deals, consider flying in May, April, June.
Typical Price by Travel Month
Median round-trip fare for each month, with the typical price range, from our ongoing tracking of this route
Cheapest month: August22,296 fares analyzedTypical low: $253