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Flight Reliability

F9 2677 · Frontier Airlines

Ontario → San Francisco (ONT–SFO)

38
Bring Snacks
WanderNerd Reliability Score
51%
Arrive within 15 minutes
27 min
Average arrival delay
3.1%
Cancelled
13 min
Median arrival delay

Based on 161 historical flights. Data through May 2026.

What the data says

The late departure is the smart one here.

F9 2677 departing between 9 PM–12 AM arrived on time 58% of the time, versus 28% between 6–9 AM.

Mondays have been rough.

F9 2677 arrived on time 60% of the time on Fridays and just 41% on Mondays. That gap is worth planning around.

Well behind the ONT–SFO route.

F9 2677 arrived on time 51% of the time, versus 70% across the ONT–SFO route.

Well behind the Frontier Airlines network.

F9 2677 arrived on time 51% of the time, versus 73% across the Frontier Airlines network.

The breakdown

On-time by weekday
  • Mon41%(42 flights)
  • Tue—(2 flights)
  • Wed—(2 flights)
  • Thu46%(26 flights)
  • Fri60%(42 flights)
  • Sat—(4 flights)
  • Sun53%(38 flights)
On-time by departure window
  • 6–9 AM28%(18 flights)
  • 9 AM–12 PM43%(14 flights)
  • 6–9 PM33%(12 flights)
  • 9 PM–12 AM58%(112 flights)
On-time trend by month
16%
May

Jun 69% → May 16% on time

On-time arrival percentage by month
MonthOn-time percentageFlights
June 202569%13
July 202542%12
August 202553%15
September 202547%17
October 202544%18
November 202576%21
December 202579%14
April 202615%13
May 202616%19
Departures on time
60%
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.