Carrier route record
F9ATL→FLL
Frontier Airlines · Atlanta to Fort Lauderdale
- Flights
- 928
- Period
- July 2025 to June 2026
- Share of route
- 13%
- Carriers
- 5
Historical statistics for July 2025 to June 2026, not live status. For today’s flights, check with Frontier Airlines.
Frontier on ATL to FLL draws a D. About one flight in three arrives at least 15 minutes late, and the typical late arrival is a little over an hour behind schedule. Build slack into anything you connect to. That rests on 928 flights. The strongest carrier on the route with a full sample, Delta Air Lines, flew 4,272 at 73.5% on time.
Delta Air Lines is the most reliable of the three carriers covered here at 73.5% on time across 4,272 flights.
Key figures
On time
64.2%
Arrivals under 15 minutes late, of 904 completed flights
Avg delay
80 min
Across delayed arrivals only, not all flights
Cancelled
2.37%
National rate is 1.81%
Whole route
70.7%
Every carrier on ATL to FLL, 7,189 flights
These figures cover 928 flights between July 2025 and June 2026. Beyond the headline rate, 17.5% 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 ATL to FLL
Frontier flew 928 of the 7,189 flights on ATL to FLL, about 13% of it. Its 64.2% on time is 7 points worse than the route as a whole, which runs 70.7%. Ranked by on-time rate it is last of five carriers on the route, where the range runs from Southwest at 100.0% to Frontier at 64.2%. One of those carriers flew fewer than 365 flights here, so treat their positions as rough.
The choice of carrier is not cosmetic here. Delta Air Lines arrives on time 73.5% of the time; Spirit Airlines manages 66.0%. Sample sizes sit next to every figure, because a two-point gap across 1,341 flights means less than a ten-point one.
| Airline | Flights | On time | Avg delay | Cancelled | Grade |
|---|---|---|---|---|---|
| Southwest Airlinesthin sample | 1 | 100.0% | — | 0.00% | A+ |
| Delta Air Lines | 4,272 | 73.5% | 55 min | 1.57% | C |
| JetBlue Airways | 647 | 70.2% | 80 min | 2.47% | C |
| Spirit Airlines | 1,341 | 66.0% | 69 min | 3.65% | C− |
| Frontier Airlines (this page) | 928 | 64.2% | 80 min | 2.37% | D |
Spirit Airlines cancels 3.6% of what it schedules here, the highest in the table. A cancelled flight never appears in an on-time rate, so read that column alongside the punctuality one rather than after it.
Flight by flight
Frontier flight numbers on ATL to FLL
Departure window
When Frontier runs best on this route
Departure time matters more here than the choice of carrier. The gap between the best and worst window is 32 points, against 8 points between the best and worst carrier. Each bar is the on-time rate for flights scheduled inside that window.
- 5am–8am131 flights80.0%
- 8am–11am68 flights47.8%
- 11am–2pm51 flights62.7%
- 2pm–5pm266 flights64.1%
- 5pm–8pm89 flights60.0%
- 8pm–5am323 flights62.5%
Scale runs 40% to 85%. Rows with fewer than 30 flights show a dash.
Book the early departure. Flights leaving between 5am–8am arrive on time 80.0% of the time, against 47.8% for the morning window. That is 32 points of difference for no extra money, and it comes from the same aircraft having had no earlier flight to fall behind on. The 8pm–5am window is the busiest, with 323 flights scheduled in it.
Across the year
Frontier on ATL to FLL through the year
July is the worst month at 45.8% on time, 43 points below September, the best at 89.1%. Summer afternoon convection and peak-season schedules land on the same weeks every year, so this is a pattern you can book around rather than a run of bad luck. March was the busiest month here, with 121 flights.
Across the week, Wednesday is the strongest day at 72.1% on time and Sunday the weakest at 54.1%. 18 points is a smaller lever than departure hour, but it is free.
Delay causes
Why Frontier runs late on this route
One category carries most of the weight here. Late-arriving aircraft accounts for 49% of the 26,000 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.
- 49%Late-arriving aircraft
- 29%Carrier
- 15%National Airspace System
- 7%Extreme weather
49% 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 26,000 reported delay minutes here, that single category outweighs weather by 7 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 25,767 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 80.0% on time here.
Cancellations sit at 2.37% against a national 1.81%, which is ordinary. Diversions add another 0.22%.
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. 17.5% 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 581 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 runs 65.0% on time across 927 flights, within about a point of this direction. The two legs are scored separately because they usually differ; on this city pair they happen not to.
One caution: this is a thin sample. 928 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 ATL to FLL
Put together: treat all of this as provisional. 928 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 64.2% headline is the most reliable number on the page; the hour and month splits below it are built on a few dozen flights each. 904 completed flights over 12 months sit behind that.
Related
Where to go next
- ATL to FLL, every carrier
- Frontier on FLL to ATL, the return leg
- Delta Air Lines on ATL to FLL73.5%
- JetBlue Airways on ATL to FLL70.2%
- Spirit Airlines on ATL to FLL66.0%
- Frontier Airlines network-wide record
- Hartsfield-Jackson Atlanta International (ATL) delay statistics
- Fort Lauderdale-Hollywood International (FLL) delay statistics
- Why the first flight of the morning is statistically safest
- The best time of day to fly, according to 7.04 million flight records
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.