Flight Reliability
F9 2021 · Frontier Airlines
Philadelphia → Detroit (PHL–DTW)
67
Usually Fine
WanderNerd Reliability Score
- 66%
- Arrive within 15 minutes
- 12 min
- Average arrival delay
- 1.6%
- Cancelled
- 3 min early
- Median arrival delay
Based on 63 historical flights. Data through May 2026.
What the data says
Morning-you made the right choice.
F9 2021 departing between 6–9 AM arrived on time 76% of the time, versus 50% between 6–9 PM.
Friday is doing you no favors.
F9 2021 arrived on time 79% of the time on Sundays and just 58% on Fridays. That gap is worth planning around.
Lagging the PHL–DTW route.
F9 2021 arrived on time 66% of the time, versus 80% across the PHL–DTW route.
Lagging the Frontier Airlines network.
F9 2021 arrived on time 66% of the time, versus 73% across the Frontier Airlines network.
The breakdown
- Mon70%(10 flights)
- Tue—(3 flights)
- Wed—(2 flights)
- Thu69%(13 flights)
- Fri58%(12 flights)
- Sat—(8 flights)
- Sun79%(14 flights)
- 6–9 AM76%(37 flights)
- 9 AM–12 PM—(3 flights)
- 12–3 PM64%(11 flights)
- 3–6 PM—(1 flights)
- 6–9 PM50%(10 flights)
- Departures on time
- 66%
- Diverted
- 0%
- Flights flown
- 62
- Months covered
- 10
Same route, other flights
Keep nerding
Based on 63 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.