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Flight Reliability

F9 3321 · Frontier Airlines

Raleigh–Durham → Miami (RDU–MIA)

63
A Little Dicey
WanderNerd Reliability Score
70%
Arrive within 15 minutes
20 min
Average arrival delay
2.5%
Cancelled
3 min early
Median arrival delay

Based on 160 historical flights. Data through May 2026.

What the data says

Morning-you made the right choice.

F9 3321 departing between 6–9 AM arrived on time 78% of the time, versus 67% between 6–9 PM.

Friday is doing you no favors.

F9 3321 arrived on time 82% of the time on Thursdays. On Fridays: 67%.

A bit behind the RDU–MIA route.

F9 3321 arrived on time 70% of the time, versus 77% across the RDU–MIA route.

A bit behind the Frontier Airlines network.

F9 3321 arrived on time 70% of the time, versus 73% across the Frontier Airlines network.

The breakdown

On-time by weekday
  • Mon76%(41 flights)
  • Tue—(2 flights)
  • Wed—(0 flights)
  • Thu82%(27 flights)
  • Fri67%(43 flights)
  • Sat—(8 flights)
  • Sun69%(35 flights)
On-time by departure window
  • 6–9 AM78%(23 flights)
  • 9 AM–12 PM77%(17 flights)
  • 12–3 PM68%(34 flights)
  • 3–6 PM70%(60 flights)
  • 6–9 PM67%(18 flights)
  • 9 PM–12 AM—(4 flights)
On-time trend by month
83%
May

Jun 64% → May 83% on time

On-time arrival percentage by month
MonthOn-time percentageFlights
June 202564%14
July 202591%11
August 202567%12
October 202569%13
December 202567%15
January 202660%15
February 202675%12
March 202640%10
April 202667%18
May 202683%18
Departures on time
71%
Diverted
0%
Flights flown
156
Months covered
12

Same route, other flights

Keep nerding

Based on 160 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.