Carrier route record

F9SJU→FLL

Frontier Airlines · San Juan to Fort Lauderdale

Flights: 128
Period: July 2025 to June 2026
Share of route: 5%
Carriers: 4

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

Frontier on SJU to FLL lands a B, 4 points better than the national rate of 77.6%. Roughly one flight in five arrives 15 minutes late or worse, and those flights are late by about 2.4 hours on average. That is a workable record, not a spotless one. That rests on 128 flights, with a median arrival 9 minutes early.

Set against the rest of the country, Frontier's SJU to FLL record is 4 points better than the US average of 77.6%. That gap is worth roughly 40 fewer late arrivals for every thousand flights.

On time

81.6%

Arrivals under 15 minutes late, of 125 completed flights

Avg delay

143 min

Across delayed arrivals only, not all flights

Cancelled

2.34%

National rate is 1.81%

Whole route

75.1%

Every carrier on SJU to FLL, 2,342 flights

These figures cover 128 flights between July 2025 and June 2026. Beyond the headline rate, 12.0% 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.

Carrier by carrier

Frontier against every carrier on SJU to FLL

Frontier flew 128 of the 2,342 flights on SJU to FLL, about 5% of it. Its 81.6% on time is 7 points better than the route as a whole, which runs 75.1%. Ranked by on-time rate it is first of four carriers on the route, where the range runs from Frontier at 81.6% to Spirit at 61.9%. Two of those carriers flew fewer than 365 flights here, so treat their positions as rough.

Only one carrier clears this site's 365-flight floor here, so there is no comparison to draw. The table below is the full picture.

On-time performance by carrier on SJU to FLL
Airline	Flights	On time	Avg delay	Cancelled	Grade
Frontier Airlines (this page)thin sample	128	81.6%	143 min	2.34%	B
JetBlue Airways	1,645	76.6%	71 min	1.28%	B
Southwest Airlinesthin sample	279	76.3%	39 min	0.36%	B+
Spirit Airlinesthin sample	290	61.9%	79 min	2.76%	D

Departure window

When Frontier runs best on this route

Departure time is the single lever a traveller controls, and it moves the odds more than most people expect. Each bar below is the on-time rate for flights scheduled to leave inside that window, across 128 flights.

There are not enough flights in each departure window to split Frontier's SJU to FLL record by time of day without the percentages moving on noise. The headline rate of 81.6% is the reliable figure here.

Across the year

Frontier on SJU to FLL through the year

Jul–Sep 202518 flights—
Oct–Dec 202525 flights—
Jan–Mar 202620 flights—
Apr–Jun 202665 flights89.2%

Scale runs 80% to 95%. Rows with fewer than 30 flights show a dash.

Monthly volumes are too low here to break the year into twelve reliable readings. What the twelve-month total says is 81.6% on time across 128 flights.

Split by quarter, Frontier on SJU to FLL logged 18 flights in Jul–Sep 2025, 25 flights in Oct–Dec 2025, 20 flights in Jan–Mar 2026 and 65 flights in Apr–Jun 2026. Fewer than three of those quarters carried the 30 completed flights this site needs before printing a rate, so the 81.6% annual figure is the one to use.

Delay causes

Why Frontier runs late on this route

One category carries most of the weight here. Late-arriving aircraft accounts for 71% of the 3,294 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
71%
Carrier
22%
National Airspace System
6%

71% 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 3,294 reported delay minutes here, that single category outweighs weather by 71 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 3,294 reported delay minutes.

The practical consequence: the 5am–8am departure is the one that starts clean. Its aircraft has no earlier leg to be late from, which is exactly why that window shows 93.0% on time here.

Cancellations sit at 2.34% against a national 1.81%, which is ordinary. Diversions add another 0.00%.

Connections and stage length

What a delay here costs

For anyone connecting, the number to weigh is not the on-time rate but the tail behind it. 12.0% 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.

The 1,046 miles between these two airports put this in the middle of the US network, around two and a half to three hours of block time. That is enough cruise to absorb a ten-minute late pushback and not enough to absorb thirty. It is also long enough that the aircraft usually flies three or four legs a day rather than six, which slows how fast delay compounds.

The return leg is a different operation and performs like one: it runs 64.2% on time across 128 flights, 17 points below this direction. Departure banks, aircraft rotations and the congestion at each end all differ, so scoring the two directions together would average away a real 17 points of difference.

One caution: this is a thin sample. 128 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 Frontier on SJU to FLL

Put together: treat all of this as provisional. 128 flights over twelve months is enough to clear this site's floor and not enough to be confident to better than a couple of points. The 81.6% headline is the most reliable number on the page; the hour and month splits below it are built on a few dozen flights each. 125 completed flights over 12 months sit behind that.

Where to go next

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