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Flight Reliability

F9 3748 · Frontier Airlines

Miami → Washington (MIA–IAD)

61
A Little Dicey
WanderNerd Reliability Score
68%
Arrive within 15 minutes
23 min
Average arrival delay
2.2%
Cancelled
6 min early
Median arrival delay

Based on 136 historical flights. Data through May 2026.

What the data says

Morning flights do better here.

F9 3748 departing between 9 AM–12 PM arrived on time 88% of the time, versus 51% between 3–6 PM.

Thursdays have been rough.

F9 3748 arrived on time 76% of the time on Fridays and just 50% on Thursdays. That gap is worth planning around.

Lagging the MIA–IAD route.

F9 3748 arrived on time 68% of the time, versus 79% across the MIA–IAD route.

A bit behind the Frontier Airlines network.

F9 3748 arrived on time 68% of the time, versus 73% across the Frontier Airlines network.

The breakdown

On-time by weekday
  • Mon73%(33 flights)
  • Tue—(0 flights)
  • Wed—(1 flights)
  • Thu50%(24 flights)
  • Fri76%(33 flights)
  • Sat60%(15 flights)
  • Sun74%(27 flights)
On-time by departure window
  • 6–9 AM—(7 flights)
  • 9 AM–12 PM88%(42 flights)
  • 12–3 PM71%(17 flights)
  • 3–6 PM51%(39 flights)
  • 6–9 PM54%(28 flights)
On-time trend by month
100%
Dec

Jun 32% → Dec 100% on time

On-time arrival percentage by month
MonthOn-time percentageFlights
June 202532%22
July 202558%19
August 202555%22
September 202588%17
October 202583%18
November 202586%14
December 2025100%13
Departures on time
77%
Diverted
0%
Flights flown
133
Months covered
10

Same route, other flights

Keep nerding

Based on 136 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.