Flight Reliability
F9 1121 · Frontier Airlines
Salt Lake City → Ontario (SLC–ONT)
88
Pretty Reliable
WanderNerd Reliability Score
- 93%
- Arrive within 15 minutes
- 9 min early
- Average arrival delay
- 3.3%
- Cancelled
- 13 min early
- Median arrival delay
Based on 30 historical flights. Data through May 2026.
What the data says
A bit ahead of the SLC–ONT route.
F9 1121 arrived on time 93% of the time, versus 89% across the SLC–ONT route.
Well ahead of the Frontier Airlines network.
F9 1121 arrived on time 93% of the time, versus 73% across the Frontier Airlines network.
The breakdown
- Mon—(6 flights)
- Tue—(1 flights)
- Wed—(0 flights)
- Thu—(9 flights)
- Fri—(6 flights)
- Sat—(0 flights)
- Sun—(7 flights)
- 9 AM–12 PM83%(12 flights)
- 12–3 PM—(6 flights)
- 3–6 PM—(6 flights)
- 6–9 PM—(5 flights)
- Departures on time
- 93%
- Diverted
- 0%
- Flights flown
- 29
- Months covered
- 5
Same route, other flights
Keep nerding
Based on 30 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.