Flight Reliability
F9 3440 · Frontier Airlines
San Francisco → Denver (SFO–DEN)
81
Pretty Reliable
WanderNerd Reliability Score
- 74%
- Arrive within 15 minutes
- 13 min
- Average arrival delay
- 0%
- Cancelled
- 5 min early
- Median arrival delay
Based on 82 historical flights. Data through May 2026.
What the data says
Morning-you made the right choice.
F9 3440 departing between 6–9 AM arrived on time 92% of the time, versus 61% between 6–9 PM.
Sunday scaries are real for this one.
F9 3440 arrived on time 81% of the time on Fridays and just 61% on Sundays. That gap is worth planning around.
The breakdown
- Mon75%(16 flights)
- Tue—(6 flights)
- Wed—(7 flights)
- Thu—(7 flights)
- Fri81%(21 flights)
- Sat—(7 flights)
- Sun61%(18 flights)
- 6–9 AM92%(37 flights)
- 9 AM–12 PM—(2 flights)
- 6–9 PM61%(43 flights)
92%
Feb
Jun 36% → Feb 92% on time
| Month | On-time percentage | Flights |
|---|---|---|
| June 2025 | 36% | 14 |
| September 2025 | 80% | 10 |
| October 2025 | 73% | 11 |
| January 2026 | 83% | 12 |
| February 2026 | 92% | 13 |
- Departures on time
- 74%
- Diverted
- 0%
- Flights flown
- 82
- Months covered
- 10
Same route, other flights
Keep nerding
Based on 82 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.