Route reliability record

MCO→ATL

Orlando to Atlanta

Flights: 8,207
Period: July 2025 to June 2026
Distance: 404 mi
Carriers: 4

This route sits in the middle of the pack with a B. Close to three flights in four arrive on time by the DOT's definition, 2 points worse than the national rate of 77.6%. The late ones land a little over an hour behind schedule. That rests on 8,207 flights, of which Delta Air Lines flew 5,463 at 79.1% on time.

Delta Air Lines is the most reliable of the four carriers covered here at 79.1% on time across 5,463 flights.

On time

75.6%

Arrivals under 15 minutes late, of 8,084 completed flights

Avg delay

79 min

Across delayed arrivals only, not all flights

Cancelled

1.40%

National rate is 1.81%

Best carrier

Delta

79.1% on time across 5,463 flights

These figures cover 8,207 flights between July 2025 and June 2026. Beyond the headline rate, 9.9% 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 MCO to ATL

The choice of carrier is not cosmetic here. Delta Air Lines arrives on time 79.1% of the time; Spirit Airlines manages 64.5%. Sample sizes sit next to every figure, because a two-point gap across 471 flights means less than a ten-point one.

On-time performance by carrier on MCO to ATL
Airline	Flights	On time	Avg delay	Cancelled	Grade
Delta Air Lines	5,463	79.1%	88 min	1.24%	B
Southwest Airlines	1,093	71.3%	59 min	1.37%	C
Frontier Airlines	1,180	67.7%	74 min	1.53%	C
Spirit Airlines	471	64.5%	68 min	2.97%	D

The spread between Delta and Spirit is 15 points, wide enough that it should decide the booking. On a hundred trips that is 15 more arrivals inside the on-time window.

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 15 points between the best and worst carrier. Each bar is the on-time rate for flights scheduled inside that window.

5am–8am1,305 flights91.9%
8am–11am1,668 flights84.7%
11am–2pm1,441 flights79.8%
2pm–5pm1,594 flights69.2%
5pm–8pm1,362 flights60.4%
8pm–5am837 flights61.6%

Scale runs 50% to 95%. Rows with fewer than 30 flights show a dash.

The 5pm–8pm window is where this operation falls apart: 60.4% on time, against 91.9% 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 8am–11am window is the busiest, with 1,668 flights scheduled in it.

Across the year

When delays peak on this route

This route's year swings by 17 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.

Darker means more delays. Figures are on-time percentages.September best, August worst

August is the worst month at 66.7% on time, 17 points below September, the best at 83.3%. 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 782 flights.

Across the week, Wednesday is the strongest day at 84.9% on time and Sunday the weakest at 66.8%. 18 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 156,000 reported delay minutes.

Late-arriving aircraft
42%
Carrier
29%
National Airspace System
23%
Extreme weather
6%
Security
0%

42% 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 156,000 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 155,848 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 91.9% on time here.

Cancellations sit at 1.40% against a national 1.81%, which is ordinary. Diversions add another 0.10%.

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. 9.9% 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.

At 404 miles this is a short hop, and stage length matters more than it looks. A flight this short spends under two hours in the air, which leaves almost nothing to claw back a late pushback with. Delay here is decided on the ground, in the turn, which is why the 5am–8am window matters as much as it does.

The return leg is a different operation and performs like one: it runs 70.7% on time across 8,211 flights, 5 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 5 points of difference.

The sample behind these figures is 8,207 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. September runs 83.3% on time and August 66.7%, a swing of 17 points. If the dates move at all, move them out of August before you think about anything else. 8,084 completed flights over 12 months sit behind that.

Common questions

MCO to ATL questions

How often is MCO to ATL delayed?

About one flight in four arrive at least 15 minutes late, which is the Department of Transportation's definition of a delayed arrival. That works out to 24.4% of the 8,207 flights in this analysis, against 22.4% nationally. Delayed flights are late by a little over an hour on average.

Which airline is most reliable on MCO to ATL?

Delta Air Lines leads at 79.1% on time across 5,463 flights. Spirit Airlines is at the other end on 64.5%, a gap of 15 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 MCO to ATL?

The 5am–8am departure window is the strongest at 91.9% on time. The 5pm–8pm window is the weakest at 60.4%, 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 August delays on MCO to ATL?

August is the weakest month at 66.7% on time, compared with 83.3% in September. Across the year that is 17 points between the best and worst months. Moving flexible dates out of that month is one of the few things that reliably helps.

Where to go next

Direction matters. MCO to ATL and ATL to MCO 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.

Key figures