Route reliability record
DFW→MIA
Dallas-Fort Worth to Miami
- Flights
- 4,831
- Period
- July 2025 to June 2026
- Distance
- 1,121 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, 9 points worse than the national rate of 77.6%. The late ones land a little over an hour behind schedule. That rests on 4,831 flights, with a median arrival 1 minutes early.
The national on-time rate over the same period is 77.6%, so this route runs 9 points behind the country as a whole. Across a thousand flights that is about 88 extra late arrivals.
Key figures
On time
68.8%
Arrivals under 15 minutes late, of 4,689 completed flights
Avg delay
75 min
Across delayed arrivals only, not all flights
Cancelled
2.73%
National rate is 1.81%
Best carrier
American
68.1% on time across 4,297 flights
These figures cover 4,831 flights between July 2025 and June 2026. Beyond the headline rate, 11.5% 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
Which airline is most reliable on DFW to MIA
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.
| Airline | Flights | On time | Avg delay | Cancelled | Grade |
|---|---|---|---|---|---|
| Spirit Airlinesthin sample | 282 | 80.4% | 62 min | 2.13% | B |
| American Airlines | 4,297 | 68.1% | 73 min | 2.82% | C |
| Frontier Airlinesthin sample | 252 | 67.2% | 108 min | 1.98% | C |
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 23 points, against half a point between the best and worst carrier. Each bar is the on-time rate for flights scheduled inside that window.
- 5am–8am1,182 flights79.9%
- 8am–11am892 flights79.4%
- 11am–2pm419 flights72.5%
- 2pm–5pm923 flights57.1%
- 5pm–8pm806 flights60.9%
- 8pm–5am609 flights56.6%
Scale runs 50% to 85%. Rows with fewer than 30 flights show a dash.
The 8pm–5am window is where this operation falls apart: 56.6% on time, against 79.9% 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 5am–8am window is the busiest, with 1,182 flights scheduled in it.
Across the year
When delays peak on this route
This route's year swings by 23 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.
August is the worst month at 53.6% on time, 23 points below April, the best at 77.1%. 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. January was the busiest month here, with 436 flights.
Across the week, Tuesday is the strongest day at 72.6% on time and Saturday the weakest at 63.2%. 9 points is a smaller lever than departure hour, but it is free.
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 109,000 reported delay minutes.
- 40%Late-arriving aircraft
- 36%Carrier
- 14%National Airspace System
- 10%Extreme weather
- 0%Security
40% 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 109,000 reported delay minutes here, that single category outweighs weather by 4 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 109,157 reported delay minutes.
The largest share of delay minutes, 36%, falls under carrier control: crew scheduling, maintenance, fuelling, baggage. Unlike weather, that is a management outcome, and it is the category where the gap between two carriers on the same schedule is genuinely earned. It accounts for 39,000 of the 109,000 delay minutes reported here.
Cancellations run at 2.73%, against 1.81% nationally. That is roughly one flight in 40 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
For anyone connecting, the number to weigh is not the on-time rate but the tail behind it. 11.5% 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 1,121 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 73.1% on time across 4,825 flights, 4 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 4 points of difference.
The sample behind these figures is 4,831 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.
What to do with this
Booking this route
Put together: the calendar is the biggest lever here, not the carrier or the hour. April runs 77.1% on time and August 53.6%, a swing of 23 points. If the dates move at all, move them out of August before you think about anything else. 4,689 completed flights over 12 months sit behind that.
Common questions
DFW to MIA questions
How often is DFW to MIA delayed?
About one flight in three arrive at least 15 minutes late, which is the Department of Transportation's definition of a delayed arrival. That works out to 31.2% of the 4,831 flights in this analysis, against 22.4% nationally. Delayed flights are late by a little over an hour on average.
How reliable is DFW to MIA compared with the rest of the country?
68.8% of flights arrive on time here against a national 77.6%, a difference of 9 points against it. That is worth a C on this site's grading scale.
What time of day has the fewest delays on DFW to MIA?
The 5am–8am departure window is the strongest at 79.9% on time. The 8pm–5am window is the weakest at 56.6%, 23 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 August delays on DFW to MIA?
August is the weakest month at 53.6% on time, compared with 77.1% in April. Across the year that is 23 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
- MIA to DFW — the return legseparate record
- Dallas/Fort Worth International (DFW) delay statistics
- Miami International (MIA) delay statistics
- Spirit Airlines on-time record80.4%
- American Airlines on-time record68.1%
- Frontier Airlines on-time record67.2%
- Why the first flight of the morning is statistically safest
- What a cancellation rate actually tells you (and what it hides)
Direction matters. DFW to MIA and MIA to DFW are scored separately because they are separate operations, with different departure banks and different aircraft. Compare the return leg.
Source: US DOT Bureau of Transportation Statistics, on-time performance data, July 2025 to June 2026. Updated monthly. How this data is collected.