Carrier route record
F9LGA→MIA
Frontier Airlines · New York to Miami
- Flights
- 119
- Period
- July 2025 to June 2026
- Share of route
- 2%
- Carriers
- 5
Historical statistics for July 2025 to June 2026, not live status. For today’s flights, check with Frontier Airlines.
Frontier on LGA to MIA draws a C−. About one flight in three arrives at least 15 minutes late, and the typical late arrival is about 4.1 hours behind schedule. Build slack into anything you connect to. That rests on 119 flights. The strongest carrier on the route with a full sample, American Airlines, flew 3,549 at 71.5% on time.
American Airlines is the most reliable of the three carriers covered here at 71.5% on time across 3,549 flights.
Key figures
On time
67.3%
Arrivals under 15 minutes late, of 107 completed flights
Avg delay
247 min
Across delayed arrivals only, not all flights
Cancelled
10.08%
National rate is 1.81%
Whole route
70.6%
Every carrier on LGA to MIA, 6,006 flights
These figures cover 119 flights between July 2025 and June 2026. Beyond the headline rate, 22.4% 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 LGA to MIA
Frontier flew 119 of the 6,006 flights on LGA to MIA, about 2% of it. Its 67.3% on time is 3 points worse than the route as a whole, which runs 70.6%. Ranked by on-time rate it is number four of five carriers on the route, where the range runs from Republic at 75.0% to Spirit at 66.1%. One of those carriers flew fewer than 365 flights here, so treat their positions as rough.
The three carriers here are closely matched: 5 points separate the best from the worst. At that spread, schedule and price are better tie-breakers than reliability. Sample sizes are shown so you can see which rows are worth weighing.
| Airline | Flights | On time | Avg delay | Cancelled | Grade |
|---|---|---|---|---|---|
| Republic Airwaysthin sample | 4 | 75.0% | 107 min | 0.00% | B+ |
| American Airlines | 3,549 | 71.5% | 93 min | 3.69% | C− |
| Delta Air Lines | 1,916 | 70.2% | 69 min | 3.97% | C− |
| Frontier Airlines (this page)thin sample | 119 | 67.3% | 247 min | 10.08% | C− |
| Spirit Airlines | 418 | 66.1% | 79 min | 6.94% | C− |
Spirit Airlines cancels 6.9% 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.
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 119 flights.
There are not enough flights in each departure window to split Frontier's LGA to MIA record by time of day without the percentages moving on noise. The headline rate of 67.3% is the reliable figure here.
Across the year
Frontier on LGA to MIA through the year
- Jul–Sep 202524 flights—
- Oct–Dec 202522 flights—
- Jan–Mar 202660 flights61.2%
- Apr–Jun 202613 flights—
Scale runs 55% to 65%. 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 67.3% on time across 119 flights.
Split by quarter, Frontier on LGA to MIA logged 24 flights in Jul–Sep 2025, 22 flights in Oct–Dec 2025, 60 flights in Jan–Mar 2026 and 13 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 67.3% 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 83% of the 8,649 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.
- 83%Late-arriving aircraft
- 12%National Airspace System
- 4%Carrier
- 0%Extreme weather
83% 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 8,649 reported delay minutes here, that single category outweighs weather by 83 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 8,649 reported delay minutes.
Cancellations run at 10.08%, against 1.81% nationally. That is about one flight in ten cancelled outright. A cancelled flight is invisible in every on-time figure on this page, so the punctuality numbers above describe only the flights that actually operated.
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. 22.4% 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 1,096 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 60.0% on time across 119 flights, 7 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 7 points of difference.
One caution: this is a thin sample. 119 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 LGA to MIA
Put together: the delay figures matter less here than the 10.08% cancellation rate. A late arrival costs you about 4.1 hours; a cancelled flight costs you the day. Book the 8pm–5am departure so there is still a schedule behind you if it goes wrong, and treat a same-day connection as optimistic. 107 completed flights over 12 months sit behind that.
Related
Where to go next
- LGA to MIA, every carrier
- Frontier on MIA to LGA, the return leg
- American Airlines on LGA to MIA71.5%
- Delta Air Lines on LGA to MIA70.2%
- Spirit Airlines on LGA to MIA66.1%
- Frontier Airlines network-wide record
- LaGuardia (LGA) delay statistics
- Miami International (MIA) delay statistics
- The US routes with the most cancellations
- Why the first flight of the morning is statistically safest
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.