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Flight Reliability

F9 2355 · Frontier Airlines

San Antonio → Denver (SAT–DEN)

89
Pretty Reliable
WanderNerd Reliability Score
87%
Arrive within 15 minutes
8 min
Average arrival delay
1.3%
Cancelled
9 min early
Median arrival delay

Based on 157 historical flights. Data through May 2026.

What the data says

The 3–6 PM departure wins.

F9 2355 departing between 3–6 PM arrived on time 92% of the time, versus 76% between 6–9 PM.

Wednesdays have been rough.

F9 2355 arrived on time 95% of the time on Mondays and just 77% on Wednesdays. That gap is worth planning around.

A bit ahead of the SAT–DEN route.

F9 2355 arrived on time 87% of the time, versus 82% across the SAT–DEN route.

Better than the Frontier Airlines network average.

F9 2355 arrived on time 87% of the time, versus 73% across the Frontier Airlines network.

The breakdown

On-time by weekday
  • Mon95%(19 flights)
  • Tue90%(19 flights)
  • Wed77%(17 flights)
  • Thu90%(19 flights)
  • Fri83%(23 flights)
  • Sat90%(31 flights)
  • Sun82%(27 flights)
On-time by departure window
  • 6–9 AM89%(70 flights)
  • 9 AM–12 PM—(7 flights)
  • 12–3 PM—(7 flights)
  • 3–6 PM92%(38 flights)
  • 6–9 PM76%(33 flights)
On-time trend by month
75%
May

Sep 100% → May 75% on time

On-time arrival percentage by month
MonthOn-time percentageFlights
September 2025100%11
October 202592%13
November 2025100%14
December 2025100%17
February 202685%13
March 202678%27
April 202680%30
May 202675%20
Departures on time
88%
Diverted
0%
Flights flown
155
Months covered
11

Same route, other flights

Keep nerding

Based on 157 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.