Flight Reliability
F9 3219 · Frontier Airlines
Denver → Salt Lake City (DEN–SLC)
88
Pretty Reliable
WanderNerd Reliability Score
- 83%
- Arrive within 15 minutes
- 0 min
- Average arrival delay
- 0.7%
- Cancelled
- 11 min early
- Median arrival delay
Based on 138 historical flights. Data through May 2026.
What the data says
The 6–9 AM departure wins.
F9 3219 departing between 6–9 AM arrived on time 94% of the time, versus 77% between 9 AM–12 PM.
Mondays have been rough.
F9 3219 arrived on time 90% of the time on Wednesdays and just 75% on Mondays. That gap is worth planning around.
A bit ahead of the DEN–SLC route.
F9 3219 arrived on time 83% of the time, versus 78% across the DEN–SLC route.
Better than the Frontier Airlines network average.
F9 3219 arrived on time 83% of the time, versus 73% across the Frontier Airlines network.
The breakdown
- Mon75%(20 flights)
- Tue82%(17 flights)
- Wed90%(20 flights)
- Thu88%(24 flights)
- Fri85%(20 flights)
- Sat78%(18 flights)
- Sun78%(18 flights)
- 6–9 AM94%(16 flights)
- 9 AM–12 PM77%(75 flights)
- 12–3 PM88%(25 flights)
- 3–6 PM86%(21 flights)
90%
May
Dec 65% → May 90% on time
| Month | On-time percentage | Flights |
|---|---|---|
| December 2025 | 65% | 23 |
| March 2026 | 73% | 26 |
| April 2026 | 89% | 28 |
| May 2026 | 90% | 30 |
- Departures on time
- 80%
- Diverted
- 0%
- Flights flown
- 137
- Months covered
- 9
Same route, other flights
Keep nerding
Based on 138 historical flights, because apparently we checked. Historical flight data: U.S. Bureau of Transportation Statistics, June 2025 – May 2026. Data through May 2026. How we calculate this.