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Flight Reliability

F9 2871 · Frontier Airlines

San Juan → Atlanta (SJU–ATL)

43
Bring Snacks
WanderNerd Reliability Score
56%
Arrive within 15 minutes
27 min
Average arrival delay
2.1%
Cancelled
7 min
Median arrival delay

Based on 285 historical flights. Data through May 2026.

What the data says

Saturdays have been rough.

F9 2871 arrived on time 75% of the time on Wednesdays and just 44% on Saturdays. That gap is worth planning around.

Well behind the SJU–ATL route.

F9 2871 arrived on time 56% of the time, versus 82% across the SJU–ATL route.

Well behind the Frontier Airlines network.

F9 2871 arrived on time 56% of the time, versus 73% across the Frontier Airlines network.

Ticking up lately.

F9 2871 arrived on time 61% of the time over the last three months in the data, compared with 56% in the three months before that.

The breakdown

On-time by weekday
  • Mon57%(46 flights)
  • Tue56%(18 flights)
  • Wed75%(20 flights)
  • Thu55%(49 flights)
  • Fri72%(47 flights)
  • Sat44%(45 flights)
  • Sun45%(51 flights)
On-time by departure window
  • 6–9 AM—(5 flights)
  • 9 AM–12 PM—(1 flights)
  • 12–3 PM—(5 flights)
  • 3–6 PM56%(262 flights)
  • 6–9 PM—(3 flights)
On-time trend by month
63%
May

Jun 38% → May 63% on time

On-time arrival percentage by month
MonthOn-time percentageFlights
June 202538%21
July 202561%18
August 202527%22
September 202567%21
October 202568%22
November 202565%20
December 202556%27
January 202642%26
February 202670%23
March 202655%29
April 202665%17
May 202663%30
Departures on time
54%
Diverted
1.1%
Flights flown
276
Months covered
12

Same route, other flights

Keep nerding

Based on 285 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.