Frontier Airlines STL to DEN on-time performance
Frontier Airlines nonstop flights from St. Louis to Denver · Aug 2025 – Jul 2026
On-time arrivals
76%
arrived < 15 min late
Cancelled
0.7%
2 flights
Avg arrival delay
20 min
79 min when late
Rank on route
#3 of 4
route average 76% on time
Key facts
- Frontier Airlines flights on STL to DEN arrived on time 76% of the time in Aug 2025 – Jul 2026.
- 0.7% were cancelled, and 11% arrived an hour or more late.
- That ranks #3 of 4 airlines on this route, which averaged 76% on time overall.
- The largest source of delay minutes was late-arriving aircraft (61%).
On-time trend by month
Why this airline's flights were late
- Late-arriving aircraft61%
- Air traffic control & airport congestion23%
- Airline (crew, maintenance, cleaning, fueling)15%
- Extreme weather1%
- Security0%
Other airlines on STL to DEN
- Southwest Airlines73% on time · 17 min avg delay
- United Airlines78% on time · 19 min avg delay
- SkyWest Airlines91% on time · 7 min avg delay
Full STL to DEN comparison →
Frontier Airlines on-time record across all routes →
291 Frontier Airlines flights tracked on this route; 2 cancelled, 0 diverted.
Data: U.S. DOT Bureau of Transportation Statistics, Aug 2025 – Jul 2026 (12 months). Latest month published by BTS: July 2026. How we calculate this.