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Flight Reliability

F9 1631 · Frontier Airlines

Orlando → St. Louis (MCO–STL)

72
Usually Fine
WanderNerd Reliability Score
72%
Arrive within 15 minutes
13 min
Average arrival delay
1.1%
Cancelled
10 min early
Median arrival delay

Based on 183 historical flights. Data through May 2026.

What the data says

Morning-you made the right choice.

F9 1631 departing between 3–6 AM arrived on time 90% of the time, versus 55% between 12–3 PM.

Wednesdays have been rough.

F9 1631 arrived on time 81% of the time on Fridays and just 62% on Wednesdays. That gap is worth planning around.

A bit behind the MCO–STL route.

F9 1631 arrived on time 72% of the time, versus 77% across the MCO–STL route.

Trending in the right direction.

F9 1631 arrived on time 87% of the time over the last three months in the data, compared with 77% in the three months before that.

The breakdown

On-time by weekday
  • Mon72%(36 flights)
  • Tue64%(11 flights)
  • Wed62%(13 flights)
  • Thu75%(20 flights)
  • Fri81%(37 flights)
  • Sat71%(28 flights)
  • Sun69%(35 flights)
On-time by departure window
  • 3–6 AM90%(20 flights)
  • 6–9 AM86%(35 flights)
  • 9 AM–12 PM89%(35 flights)
  • 12–3 PM55%(11 flights)
  • 3–6 PM—(1 flights)
  • 6–9 PM—(1 flights)
  • 9 PM–12 AM56%(77 flights)
On-time trend by month
90%
Mar

Jun 60% → Mar 90% on time

On-time arrival percentage by month
MonthOn-time percentageFlights
June 202560%30
July 202560%30
August 202554%24
September 202577%13
October 202573%11
November 202581%16
December 202580%10
January 202692%13
March 202690%19
Departures on time
67%
Diverted
0.5%
Flights flown
180
Months covered
11

Same route, other flights

Keep nerding

Based on 183 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.