Flight number record

F9 2871

Frontier Airlines · San Juan to Atlanta

Route: SJU → ATL
Departs: 17:15
Flights: 293
Period: July 2025 to June 2026

Historical statistics for July 2025 to June 2026, not live status. For today’s F9 2871, check with Frontier Airlines.

F9 2871 earns a D, which is as low as this site's scale goes for a reason. Only 57.2% of flights arrive inside the 15-minute window, 20 points worse than the national rate of 77.6%. Late arrivals average a little over an hour. Treat any tight connection here as a coin flip. That rests on 293 flights, with a median arrival 7 minutes late.

The national on-time rate over the same period is 77.6%, so F9 2871 runs 20 points behind the country as a whole. Across a thousand flights that is about 204 extra late arrivals.

On time

57.2%

Arrivals under 15 minutes late, of 285 completed flights

Avg delay

76 min

Across delayed arrivals only, not all flights

Cancelled

2.05%

National rate is 1.81%

1 hour+ late

17.9%

National rate is 8.1%

These figures cover 293 flights between July 2025 and June 2026. Beyond the headline rate, 17.9% of arrivals land a full hour or more behind schedule. That is the number that wrecks a connection, and it is not visible in an on-time percentage alone.

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 57 of 293 flights. Carriers retime flights through the season, so the rates here blend slightly different positions in the aircraft's day.

Departs 17:1557 flights19.5%

Scale runs 0% to 100%. Rows with fewer than 30 flights show a dash.

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 68.2%, and F9 2871 runs 11 points worse at 57.2%. By that time of day most aircraft have flown several legs already, and whatever went wrong earlier is still in the schedule.

Against the route

F9 2871 next to SJU to ATL

Every carrier on SJU to ATL combined arrived on time 82.0% of the time across 2,126 flights, so F9 2871 is 25 points behind it. Across its whole network Frontier Airlines managed 73.2%, which this flight trails by 16 points.

F9 2871 against its route and carrier
Compared with	Flights	On time	Avg delay	Cancelled	Grade
F9 2871thin sample	293	57.2%	76 min	2.05%	D
All Frontier Airlines on SJU–ATL	365	56.9%	92 min	2.19%	D
All carriers on SJU–ATL	2,126	82.0%	82 min	1.36%	B
Frontier Airlines, whole network	205,332	73.2%	84 min	1.85%	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 2025 at 50.8%, a swing of 10 points on roughly 73 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 202565 flights50.8%
Oct–Dec 202570 flights60.9%
Jan–Mar 202681 flights55.1%
Apr–Jun 202677 flights61.0%

Scale runs 40% to 65%. Rows with fewer than 30 flights show a dash.

By weekday, F9 2871 did best on Friday at 70.8% on time and worst on Sunday at 46.0%. Each day rests on about 42 flights, so a gap of 25 points is worth noticing but could still narrow in another year.

Delay causes

Why F9 2871 runs late

One category carries most of the weight here. Late-arriving aircraft accounts for 68% of the 9,277 delay minutes carriers reported, and the remaining four split what is left. The split is by minutes rather than by flights, so a few very long delays count for as much as many short ones.

Late-arriving aircraft
68%
National Airspace System
16%
Carrier
15%
Extreme weather
1%

68% of delay minutes trace back to a late-arriving aircraft, meaning the plane was already behind before it got here. That is a cascade, and cascades start small and grow through the day. Across 9,277 reported delay minutes here, that single category outweighs weather by 68 to one. It is the strongest argument for booking the first departure of the morning, when the aircraft has been sitting at the gate overnight with nothing to inherit. The split is drawn from 9,277 delay minutes reported on F9 2871.

Cancellations sit at 2.05% against a national 1.81%, which is ordinary. Diversions add another 0.68%.

Connections and routes

What a delay on this flight costs

For anyone connecting, the number to weigh is not the on-time rate but the tail behind it. 17.9% of arrivals land a full hour or more behind schedule, against 8.1% nationally. A 45-minute layover does not survive that, and no amount of walking quickly changes it. Ninety minutes is the honest minimum 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 293 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. 293 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. 17.9% 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.

Where to go next

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, July 2025 to June 2026. Last updated 15 September 2026; recomputed monthly. How this data is collected.

Key figures