Flight Reliability
F9 3934 · Frontier Airlines
Boise → Denver (BOI–DEN)
77
Usually Fine
WanderNerd Reliability Score
- 75%
- Arrive within 15 minutes
- 22 min
- Average arrival delay
- 0%
- Cancelled
- 8 min early
- Median arrival delay
Based on 121 historical flights. Data through May 2026.
What the data says
Sunday scaries are real for this one.
F9 3934 arrived on time 95% of the time on Fridays and just 67% on Sundays. That gap is worth planning around.
A bit behind the BOI–DEN route.
F9 3934 arrived on time 75% of the time, versus 81% across the BOI–DEN route.
It basically never cancels.
Out of 121 scheduled flights, only 0.0% were cancelled.
Trending in the right direction.
F9 3934 arrived on time 94% of the time over the last three months in the data, compared with 83% in the three months before that.
The breakdown
- Mon—(5 flights)
- Tue—(2 flights)
- Wed—(0 flights)
- Thu71%(44 flights)
- Fri95%(19 flights)
- Sat—(3 flights)
- Sun67%(48 flights)
- 9 AM–12 PM—(8 flights)
- 12–3 PM74%(113 flights)
100%
Feb
Aug 64% → Feb 100% on time
| Month | On-time percentage | Flights |
|---|---|---|
| August 2025 | 64% | 11 |
| September 2025 | 90% | 10 |
| October 2025 | 69% | 13 |
| November 2025 | 90% | 10 |
| December 2025 | 92% | 12 |
| January 2026 | 92% | 12 |
| February 2026 | 100% | 11 |
- Departures on time
- 76%
- Diverted
- 0%
- Flights flown
- 121
- Months covered
- 12
Same route, other flights
Keep nerding
Based on 121 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.