Flight Reliability
F9 3747 · Frontier Airlines
Washington → Miami (IAD–MIA)
0
Bring Snacks
WanderNerd Reliability Score
- 37%
- Arrive within 15 minutes
- 87 min
- Average arrival delay
- 2.3%
- Cancelled
- 22 min
- Median arrival delay
Based on 44 historical flights. Data through May 2026.
What the data says
Thursdays have been rough.
F9 3747 arrived on time 53% of the time on Saturdays and just 21% on Thursdays. That gap is worth planning around.
Well behind the IAD–MIA route.
F9 3747 arrived on time 37% of the time, versus 80% across the IAD–MIA route.
Well behind the Frontier Airlines network.
F9 3747 arrived on time 37% of the time, versus 73% across the Frontier Airlines network.
The breakdown
- Mon—(6 flights)
- Tue—(0 flights)
- Wed—(0 flights)
- Thu21%(14 flights)
- Fri—(2 flights)
- Sat53%(15 flights)
- Sun—(6 flights)
- 12–3 PM—(8 flights)
- 3–6 PM—(6 flights)
- 6–9 PM31%(26 flights)
- 9 PM–12 AM—(3 flights)
- Departures on time
- 37%
- Diverted
- 0%
- Flights flown
- 43
- Months covered
- 6
Same route, other flights
Keep nerding
Based on 44 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.