Skip to content
WanderNerd
Check a flight

Flight Reliability

F9 2678 · Frontier Airlines

San Francisco → Ontario (SFO–ONT)

34
Bring Snacks
WanderNerd Reliability Score
56%
Arrive within 15 minutes
44 min
Average arrival delay
3.1%
Cancelled
7 min
Median arrival delay

Based on 161 historical flights. Data through May 2026.

What the data says

Morning-you made the right choice.

F9 2678 departing between 6–9 AM arrived on time 88% of the time, versus 46% between 9 PM–12 AM.

Thursday has been the better bet.

A small edge: 58% on time on Thursdays against 52% on Mondays.

Well behind the SFO–ONT route.

F9 2678 arrived on time 56% of the time, versus 78% across the SFO–ONT route.

Well behind the Frontier Airlines network.

F9 2678 arrived on time 56% of the time, versus 73% across the Frontier Airlines network.

The breakdown

On-time by weekday
  • Mon52%(42 flights)
  • Tue—(2 flights)
  • Wed—(2 flights)
  • Thu58%(26 flights)
  • Fri56%(41 flights)
  • Sat—(4 flights)
  • Sun54%(39 flights)
On-time by departure window
  • 6–9 AM88%(16 flights)
  • 9 AM–12 PM74%(23 flights)
  • 3–6 PM—(1 flights)
  • 6–9 PM—(4 flights)
  • 9 PM–12 AM46%(112 flights)
On-time trend by month
63%
May

Jun 43% → May 63% on time

On-time arrival percentage by month
MonthOn-time percentageFlights
June 202543%14
July 202550%12
August 202553%15
September 202541%17
October 202539%18
November 202548%21
December 202557%14
April 202685%13
May 202663%19
Departures on time
49%
Diverted
0%
Flights flown
156
Months covered
11

Same route, other flights

Keep nerding

Based on 161 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.