Route reliability record
MIA→JFK
Miami to New York
- Flights
- 4,526
- Period
- September 2025 to August 2026
- Distance
- 1,089 mi
- Carriers
- 3
This route sits in the middle of the pack with a C−. About seven flights in ten arrive on time by the DOT's definition, 6 points worse than the national rate of 77.3%. The late ones land a little over an hour behind schedule. That rests on 4,526 MIA to JFK flights, of which Delta Air Lines flew 1,621 at 72.2% on time.
Best time to fly MIA to JFK: a 5am–8am departure, ideally on a Wednesday. Flights in that window arrived on time 90.8% of the time and Wednesday flights 78.2%, against 71.6% for the route overall.
The national on-time rate over the same period is 77.3%, so this route runs 6 points behind the country as a whole. Across a thousand flights that is about 57 extra late arrivals.
Key figures
On time
71.6%
Arrivals under 15 minutes late, of 4,369 completed flights
Avg delay
78 min
Across delayed arrivals only, not all flights
Cancelled
3.09%
National rate is 1.89%
Best carrier
Delta
72.2% on time across 1,621 flights
These figures cover 4,526 flights between September 2025 and August 2026. Beyond the headline rate, 11.4% of arrivals land a full hour or more behind schedule, against 8.3% nationally.
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Carrier by carrier
Which airline is most reliable on MIA to JFK
The two carriers here are closely matched: 2 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 |
|---|---|---|---|---|---|
| Frontier Airlinesthin sample | 213 | 79.3% | 113 min | 2.35% | B |
| Delta Air Lines | 1,621 | 72.2% | 75 min | 3.45% | C− |
| American Airlines | 2,692 | 70.6% | 78 min | 2.93% | C |
Delta Air Lines cancels 3.5% 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
Flights on MIA to JFK
The flight numbers below flew this route at least 250 times in the period, busiest first. Each has its own record, with its schedule and delay causes.
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Best ways to make this trip
The most reliable ways to fly Miami to New York
Every airline on this route and on the routes between nearby airports, ranked by how often a scheduled flight actually operated and arrived on time. 5 of the top 5 use a different airport at one end.
| Option | Airline | Success | On time | Cancelled | Best departure | Most punctual flight |
|---|---|---|---|---|---|---|
| 1. FLL → EWRFort Lauderdale to Newark | United Airlines | 76.1% | 78.1% | 2.57% | 5am–8am, Wed | — |
| 2. MIA → EWRMiami to Newark | United Airlines | 73.7% | 75.5% | 2.37% | 5am–8am, Wed | UA 1864 07:07 |
| 3. FLL → HPNFort Lauderdale to White Plains | JetBlue Airways | 72.7% | 74.3% | 2.16% | 5am–8am, Wed | B6 814 07:00 |
| 4. FLL → JFKFort Lauderdale to New York | Delta Air Lines | 71.9% | 74.9% | 4.02% | 5am–8am, Wed | DL 2165 07:25 |
| 5. MIA → LGAMiami to New York | Delta Air Lines | 70.5% | 73.4% | 3.91% | 5am–8am, Sat | DL 2387 07:00 |
Success is the share of scheduled flights that operated and arrived less than 15 minutes late, so a cancelled flight counts against it. “(route)” means the best time comes from every carrier on the route rather than this airline alone.
Departure window
The best time of day to leave
Departure time matters more here than the choice of carrier. The gap between the best and worst window is 32 points, against 2 points between the best and worst carrier.
- 5am–8am823 flights90.8%
- 8am–11am552 flights84.8%
- 11am–2pm537 flights75.7%
- 2pm–5pm973 flights66.1%
- 5pm–8pm830 flights58.7%
- 8pm–5am811 flights59.9%
Scale runs 50% to 95%.
The 5pm–8pm window is where this operation falls apart: 58.7% on time, against 90.8% for the 5am–8am slot. By evening the aircraft flying these rotations have absorbed a full day of small delays and there is no slack left to recover in. The 2pm–5pm window is the busiest, with 973 flights scheduled in it.
Explore
Filter MIA to JFK by airline, time, month and day
Pick a breakdown and a carrier. The dashed mark on each row is the same slice for every US flight.
On MIA to JFK, the best departure window is 5am–8am at 90.8% on time and the worst is 5pm–8pm at 58.7%, a wide gap of 32.1 points. All US flights leaving 5am–8am ran 89.3%.
- 5–8am90.8%
- 8–11am84.8%
- 11am–2pm75.7%
- 2–5pm66.1%
- 5–8pm58.7%
- 8pm–5am59.9%
best all US flightsScale 50% to 95%.
Across the year
When delays peak on this route
This route's year swings by 24 points from best month to worst, which is wide. An annual average tells you very little about the week you are actually flying, so read the strip rather than the headline if your dates are fixed.
July is the worst month at 61.5% on time, 24 points below September, the best at 85.4%. 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. April was the busiest month here, with 408 flights.
Across the week, Wednesday is the strongest day at 78.2% on time and Sunday the weakest at 62.6%, a spread of 16 points.
Delay causes
Why this route gets delayed
Carriers report a reason for every delay minute they cause, in five DOT categories. The split below is by minutes, not by number of flights, so a handful of very long weather delays weighs as much as many short ones. It covers 97,000 reported delay minutes.
- 35%Late-arriving aircraft
- 29%Carrier
- 28%National Airspace System
- 8%Extreme weather
- 0%Security
35% of delay minutes trace back to a late-arriving aircraft, meaning the plane was already behind before it got here. Across 97,000 reported delay minutes here, that single category outweighs weather by 5 to one. The split is drawn from 96,994 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 90.8% on time here.
Cancellations run at 3.09%, against 1.89% nationally. That is about one flight in 30 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 actually costs
11.4% 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.
The 1,089 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.
The return leg is a different operation and performs like one: it runs 76.8% on time across 4,526 flights, 5 points above 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 5 points of difference.
The sample behind these figures is 4,526 flights, enough that the headline rate is stable to within roughly a point. The hour-block and month splits divide that further, so read the thinner bars with more caution than the headline.
Work out the risk of missing a connection in JFK after this flight
What to do with this
Booking this route
Put together: the delay figures matter less here than the 3.09% cancellation rate. A late arrival costs you a little over an hour; a cancelled flight costs you the day. Book the 5am–8am departure so there is still a schedule behind you if it goes wrong, and treat a same-day connection as optimistic. 4,369 completed flights over 12 months sit behind that.
Common questions
MIA to JFK questions
How often is MIA to JFK delayed?
Roughly one flight in four arrives at least 15 minutes late, which is the Department of Transportation's definition of a delayed arrival. That works out to 28.4% of the 4,526 flights in this analysis, against 22.7% nationally. Delayed flights are late by a little over an hour on average.
Which airline is most reliable on MIA to JFK?
Delta Air Lines leads at 72.2% on time across 1,621 flights. American Airlines is at the other end on 70.6%, a gap of 2 points. Sample size matters as much as the percentage: a rate built from a few hundred flights moves around far more than one built from ten thousand.
What time of day has the fewest delays on MIA to JFK?
The 5am–8am departure window is the strongest at 90.8% on time. The 5pm–8pm window is the weakest at 58.7%, 32 points behind. Later departures inherit delays from earlier flights the same aircraft has already flown, which is why the curve slopes the way it does.
How bad are July delays on MIA to JFK?
July is the weakest month at 61.5% on time, compared with 85.4% in September. Across the year that is 24 points between the best and worst months. Moving flexible dates out of that month is one of the few things that reliably helps.
Related
Where to go next
- JFK to MIA — the return legseparate record
- Miami International (MIA) delay statistics
- John F. Kennedy International (JFK) delay statistics
- Frontier Airlines on MIA to JFK79.3%
- Delta Air Lines on MIA to JFK72.2%
- American Airlines on MIA to JFK70.6%
- MIA to ATL, a related route74.2%
- LAX to JFK, a related route77.5%
- MIA to LGA, a related route67.4%
- Frontier Airlines on-time record79.3%
- Delta Air Lines on-time record72.2%
- American Airlines on-time record70.6%
- The US routes with the most cancellations
- Why the first flight of the morning is statistically safest
Direction matters. MIA to JFK and JFK to MIA are scored separately because they are separate operations, with different departure banks and different aircraft. Compare the return leg.
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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.