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Flight Reliability

F9 3573 · Frontier Airlines

Newark → San Juan (EWR–SJU)

28
Bring Snacks
WanderNerd Reliability Score
56%
Arrive within 15 minutes
50 min
Average arrival delay
3.0%
Cancelled
10 min
Median arrival delay

Based on 198 historical flights. Data through May 2026.

What the data says

Mornings have a slight edge.

Departures between 9 AM–12 PM arrived on time 60% of the time, against 56% between 9 PM–12 AM.

Sunday scaries are real for this one.

F9 3573 arrived on time 63% of the time on Saturdays and just 41% on Sundays. That gap is worth planning around.

Lagging the EWR–SJU route.

F9 3573 arrived on time 56% of the time, versus 71% across the EWR–SJU route.

Well behind the Frontier Airlines network.

F9 3573 arrived on time 56% of the time, versus 73% across the Frontier Airlines network.

The breakdown

On-time by weekday
  • Mon45%(31 flights)
  • Tue60%(20 flights)
  • Wed61%(33 flights)
  • Thu62%(21 flights)
  • Fri61%(31 flights)
  • Sat63%(32 flights)
  • Sun41%(22 flights)
On-time by departure window
  • 9 AM–12 PM60%(30 flights)
  • 9 PM–12 AM56%(160 flights)
On-time trend by month
83%
Jan

Jun 57% → Jan 83% on time

On-time arrival percentage by month
MonthOn-time percentageFlights
June 202557%28
July 202548%31
August 202541%29
September 202560%30
October 202565%20
November 202559%17
December 202550%16
January 202683%12
Departures on time
65%
Diverted
1.0%
Flights flown
190
Months covered
9

Same route, other flights

Keep nerding

Based on 198 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.