Flight Reliability
F9 3866 · Frontier Airlines
Everett → Denver (PAE–DEN)
86
Pretty Reliable
WanderNerd Reliability Score
- 78%
- Arrive within 15 minutes
- 3 min
- Average arrival delay
- 0%
- Cancelled
- 9 min early
- Median arrival delay
Based on 58 historical flights. Data through May 2026.
What the data says
Mondays have been rough.
F9 3866 arrived on time 89% of the time on Fridays and just 66% on Mondays. That gap is worth planning around.
A bit ahead of the Frontier Airlines network.
F9 3866 arrived on time 78% of the time, versus 73% across the Frontier Airlines network.
The breakdown
- Mon66%(29 flights)
- Tue—(0 flights)
- Wed—(1 flights)
- Thu—(0 flights)
- Fri89%(28 flights)
- Sat—(0 flights)
- Sun—(0 flights)
- Departures on time
- 81%
- Diverted
- 0%
- Flights flown
- 58
- Months covered
- 8
Keep nerding
Based on 58 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.