Flight Reliability
F9 3406 · Frontier Airlines
Seattle → Denver (SEA–DEN)
78
Usually Fine
WanderNerd Reliability Score
- 75%
- Arrive within 15 minutes
- 7 min
- Average arrival delay
- 1.4%
- Cancelled
- 3 min early
- Median arrival delay
Based on 287 historical flights. Data through May 2026.
What the data says
The 3–6 PM departure wins.
F9 3406 departing between 3–6 PM arrived on time 86% of the time, versus 70% between 6–9 AM.
Tuesdays have been rough.
F9 3406 arrived on time 84% of the time on Sundays and just 66% on Tuesdays. That gap is worth planning around.
The breakdown
- Mon66%(47 flights)
- Tue66%(29 flights)
- Wed68%(25 flights)
- Thu83%(48 flights)
- Fri76%(50 flights)
- Sat77%(35 flights)
- Sun84%(49 flights)
- 6–9 AM70%(125 flights)
- 12–3 PM78%(136 flights)
- 3–6 PM86%(22 flights)
82%
Apr
Jun 72% → Apr 82% on time
| Month | On-time percentage | Flights |
|---|---|---|
| June 2025 | 72% | 29 |
| July 2025 | 53% | 30 |
| August 2025 | 80% | 30 |
| September 2025 | 70% | 30 |
| October 2025 | 88% | 25 |
| November 2025 | 80% | 30 |
| December 2025 | 68% | 25 |
| January 2026 | 86% | 21 |
| February 2026 | 79% | 19 |
| March 2026 | 78% | 18 |
| April 2026 | 82% | 17 |
- Departures on time
- 78%
- Diverted
- 0%
- Flights flown
- 283
- Months covered
- 12
Same route, other flights
Keep nerding
Based on 287 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.