Flight number record
F9 2871
Frontier Airlines · San Juan to Atlanta
- Route
- SJU → ATL
- Departs
- 17:15
- Flights
- 311
- Period
- September 2025 to August 2026
Historical statistics for September 2025 to August 2026, not live status. For today’s F9 2871, check with Frontier Airlines.
F9 2871 earns an F, which is as low as this site's scale goes for a reason. Only 54.8% of flights arrive inside the 15-minute window, 23 points worse than the national rate of 77.3%. Late arrivals average a little over an hour. Treat any tight connection here as a coin flip. That rests on 311 flights, with a median arrival 9 minutes late.
The national on-time rate over the same period is 77.3%, so F9 2871 runs 23 points behind the country as a whole. Across a thousand flights that is about 225 extra late arrivals.
Key figures
On time
54.8%
Arrivals under 15 minutes late, of 305 completed flights
Avg delay
72 min
Across delayed arrivals only, not all flights
Cancelled
1.93%
National rate is 1.89%
1 hour+ late
18.7%
National rate is 8.3%
These figures cover 311 flights between September 2025 and August 2026. Beyond the headline rate, 18.7% of arrivals land a full hour or more behind schedule, against 8.3% nationally.
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Schedule
When F9 2871 flies
F9 2871 flies SJU to ATL without a single fixed slot. Its most common scheduled departure was 17:15, used on 94 of 311 flights.
- Departs 17:1594 flights30.2%
Scale runs 0% to 100%.
Share of scheduled departures at each local time. Times used on fewer than one flight in ten are not listed.
A 17:15 departure sits in the 5pm–8pm window. Across every US flight scheduled in that window the on-time rate is 68.0%, and F9 2871 runs 13 points worse at 54.8%. By that time of day most aircraft have flown several legs already, and whatever went wrong earlier is still in the schedule.
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Against the route
F9 2871 next to SJU to ATL
Every carrier on SJU to ATL combined arrived on time 81.6% of the time across 2,097 flights, so F9 2871 is 27 points behind it. Across its whole network Frontier Airlines managed 72.7%, which this flight trails by 18 points.
| Compared with | Flights | On time | Avg delay | Cancelled | Grade |
|---|---|---|---|---|---|
| F9 2871thin sample | 311 | 54.8% | 72 min | 1.93% | F |
| All Frontier Airlines on SJU–ATL | 383 | 55.0% | 87 min | 2.09% | D |
| All carriers on SJU–ATL | 2,097 | 81.6% | 80 min | 1.34% | B |
| Frontier Airlines, whole network | 213,022 | 72.7% | 84 min | 2.05% | C |
Across the year
F9 2871 quarter by quarter
F9 2871 did not run the same all year. Its best quarter was Apr–Jun 2026 at 61.0% on time and its weakest Jul–Sep 2026 at 35.0%, a swing of 26 points on roughly 78 flights a quarter. The twelve-month rate averages over that, so if you are flying in a weak quarter the quarter's own figure is the better guide.
- Jul–Sep 202521 flights—
- Oct–Dec 202570 flights60.9%
- Jan–Mar 202681 flights55.1%
- Apr–Jun 202677 flights61.0%
- Jul–Sep 202662 flights35.0%
Scale runs 25% to 65%. Rows with fewer than 30 flights show a dash.
By weekday, F9 2871 did best on Wednesday at 63.6% on time and worst on Tuesday at 46.7%. Each day rests on about 44 flights, so a gap of 17 points is worth noticing but could still narrow in another year.
Arrival by arrival
How late F9 2871 runs when it is late
The 138 late arrivals split 38 under half an hour, 43 between 30 and 60 minutes, and 57 an hour or more.
- 15+ min early70 flights23.0%
- Within 15 min97 flights31.8%
- 15–29 min late38 flights12.5%
- 30–59 min late43 flights14.1%
- 1–2 hours late33 flights10.8%
- 2+ hours late24 flights7.9%
Scale runs 0% to 100%.
Share of 305 completed flights by arrival against schedule.
28 of 124 late departures made up the time and arrived on time, 23% of them. In the other direction, 42 flights left on time yet arrived 15 minutes late or more, so that delay built up after pushback: in the air, in a holding pattern or on the ground at ATL.
The worst days
Worst days for F9 2871
The latest arrival of the period was on 4 January 2026, 6 hours 34 minutes behind schedule; most of its delay minutes were filed as a late-arriving aircraft. The same cause led on four of the five worst days.
| Date | Arrived late by | Largest filed cause |
|---|---|---|
| 4 January 2026 | 6 hours 34 minutes | Late-arriving aircraft |
| 17 August 2026 | 6 hours 22 minutes | Late-arriving aircraft |
| 31 October 2025 | 4 hours 59 minutes | Late-arriving aircraft |
| 27 July 2026 | 3 hours 56 minutes | Late-arriving aircraft |
| 25 February 2026 | 3 hours 38 minutes | Carrier |
Delay causes
Why F9 2871 runs late
Late-arriving aircraft accounts for 66% of the 9,979 delay minutes carriers reported here, and the remaining four split what is left.
- 66%Late-arriving aircraft
- 21%National Airspace System
- 13%Carrier
- 0%Extreme weather
66% of delay minutes trace back to a late-arriving aircraft, meaning the plane was already behind before it got here. Across 9,979 reported delay minutes here, that single category outweighs weather by 66 to one. The split is drawn from 9,979 delay minutes reported on F9 2871.
Cancellations sit at 1.93% against a national 1.89%, which is ordinary. Diversions add another 0.00%.
Connections and routes
What a delay on this flight costs
18.7% of arrivals land a full hour or more behind schedule, against 8.3% nationally. Ninety minutes is the honest minimum for a connection here, and two hours if the onward flight is on a separate ticket.
At 1,547 miles this is transcontinental flying, and long routes get a quiet structural advantage. Scheduled block time on a flight this length carries more padding in absolute minutes, so a twenty-minute late departure often still becomes an on-time arrival. Read the on-time rate here as slightly flattering next to a short-haul route with the same operational quality.
Every one of the 311 flights under F9 2871 in the data flew SJU to ATL. The number was not reused on any other city pair, which makes this a clean record of one route.
One caution: this is a thin sample. 311 flights over twelve months is enough to clear this site's floor but not enough to pin the rate down tightly, and a single bad week moves it by more than a point. Treat the grade as a rough reading.
What to do with this
Booking F9 2871
For a booking, F9 2871 is a flight to put a long connection behind. 18.7% of its completed flights arrived an hour or more late, which a short layover will not absorb. If the onward flight is on a separate ticket, the risk sits with you.
Related
Where to go next
- SJU to ATL, every carrier and departure
- ATL to SJU, the return direction
- Delta Air Lines 1946 on the same route88.1%
- Delta Air Lines 1763 on the same route95.3%
- Delta Air Lines 1882 on the same route86.9%
- Delta Air Lines 1757 on the same route90.8%
- Luis Munoz Marin International (SJU) delay statistics
- Hartsfield-Jackson Atlanta International (ATL) delay statistics
- Frontier Airlines on-time record
- Every Frontier Airlines flight number with a record
- The most and least reliable flight numbers in the US
- Why the first flight of the morning is statistically safest
A flight number here means Frontier Airlines’s own number as it reports to the DOT. How the figures are computed is on the methodology page.
Source: US DOT Bureau of Transportation Statistics, on-time performance data, September 2025 to August 2026. Last updated ; recomputed monthly. How this data is collected.