Carrier route record

DLMCI→ATL

Delta Air Lines · Kansas City to Atlanta

Flights: 2,759
Period: July 2025 to June 2026
Share of route: 84%
Carriers: 3

Historical statistics for July 2025 to June 2026, not live status. For today’s flights, check with Delta Air Lines.

Delta on MCI to ATL earns an A. Close to nine flights in ten arrive inside the 15-minute window the DOT uses to define an on-time arrival, which puts it 13 points better than the national rate of 77.6%. When something does go wrong the average delay runs a little over an hour. That rests on 2,759 flights, with a median arrival 13 minutes early.

Set against the rest of the country, Delta's MCI to ATL record is 13 points better than the US average of 77.6%. That gap is worth roughly 125 fewer late arrivals for every thousand flights.

On time

90.1%

Arrivals under 15 minutes late, of 2,709 completed flights

Avg delay

74 min

Across delayed arrivals only, not all flights

Cancelled

1.52%

National rate is 1.81%

Whole route

87.4%

Every carrier on MCI to ATL, 3,281 flights

These figures cover 2,759 flights between July 2025 and June 2026. The median arrival is 13 minutes early, which is the part an average hides: most flights here are fine, and the on-time rate is decided by a tail of badly late ones. On-time means under 15 minutes late, the DOT's own threshold.

Carrier by carrier

Delta against every carrier on MCI to ATL

Delta flew 2,759 of the 3,281 flights on MCI to ATL, most of the route. Its 90.1% on time is 3 points better than the route as a whole, which runs 87.4%. Ranked by on-time rate it is first of three carriers on the route, where the range runs from Delta at 90.1% to Frontier at 60.6%. One of those carriers flew fewer than 365 flights here, so treat their positions as rough.

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.

On-time performance by carrier on MCI to ATL
Airline	Flights	On time	Avg delay	Cancelled	Grade
Delta Air Lines (this page)	2,759	90.1%	74 min	1.52%	A
Southwest Airlines	365	78.8%	59 min	0.27%	B+
Frontier Airlinesthin sample	157	60.6%	86 min	1.27%	D

Flight by flight

Delta flight numbers on MCI to ATL

Departure window

When Delta 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 2,759 flights.

5am–8am718 flights93.5%
8am–11am644 flights91.5%
11am–2pm476 flights88.9%
2pm–5pm372 flights88.7%
5pm–8pm546 flights86.2%
8pm–5am3 flights—

Scale runs 80% to 100%. Rows with fewer than 30 flights show a dash.

The early departures do better, though not dramatically: 93.5% on time for the 5am–8am window against 86.2% for 5pm–8pm. Worth taking if the schedule allows, not worth an extra connection. The 5am–8am window is the busiest, with 718 flights scheduled in it.

Across the year

Delta on MCI to ATL through the year

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

December is the weak month at 84.7% on time, against 95.3% in August. Winter delays cluster: a single storm system can account for most of a month's shortfall, so an average December hides both very good weeks and genuinely unflyable days. July was the busiest month here, with 263 flights.

Across the week, Wednesday is the strongest day at 93.8% on time and Sunday the weakest at 83.3%. 11 points is a smaller lever than departure hour, but it is free.

Delay causes

Why Delta runs late on this route

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 20,000 reported delay minutes.

Carrier
42%
Late-arriving aircraft
34%
National Airspace System
19%
Extreme weather
6%

The largest share of delay minutes, 42%, 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 8,291 of the 20,000 delay minutes reported here. The split is drawn from 19,788 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 93.5% on time here.

Cancellations sit at 1.52% against a national 1.81%, which is ordinary. Diversions add another 0.29%.

Connections and stage length

What a delay here costs

Badly late arrivals are rare here: only 3.6% land an hour or more behind schedule, against 8.1% nationally. Connections built on this flight are about as safe as US domestic connections get, though a cancelled flight still ignores every layover you give it.

The 692 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 84.6% on time across 2,758 flights, 6 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 6 points of difference.

The sample behind these figures is 2,759 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 Delta on MCI to ATL

Put together: take the 5am–8am departure, avoid December if the dates are flexible, and if two carriers are within a few dollars of each other, Southwest is the one with the record behind it. None of that guarantees an on-time arrival; it moves the odds by 7 points, which is the most any booking decision can do. 2,709 completed flights over 12 months sit behind that.

Where to go next

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.

Key figures