Carrier route record

DLMIA→RDU

Delta Air Lines · Miami to Raleigh

Flights: 360
Period: September 2025 to August 2026
Share of route: 15%
Carriers: 5

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

Delta on MIA to RDU draws a C. About one flight in three arrives at least 15 minutes late, and the typical late arrival is an hour and a half behind schedule. Build slack into anything you connect to. That rests on 360 flights, with a median arrival 4 minutes early.

The national on-time rate over the same period is 77.3%, so Delta on MIA to RDU runs 10 points behind the country as a whole. Across a thousand flights that is about 100 extra late arrivals.

On time

67.3%

Arrivals under 15 minutes late, of 352 completed flights

Avg delay

88 min

Across delayed arrivals only, not all flights

Cancelled

1.94%

National rate is 1.89%

Whole route

71.7%

Every carrier on MIA to RDU, 2,365 flights

These figures cover 360 flights between September 2025 and August 2026. Beyond the headline rate, 15.9% of arrivals land a full hour or more behind schedule, against 8.3% nationally.

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Carrier by carrier

Delta against every carrier on MIA to RDU

Delta flew 360 of the 2,365 flights on MIA to RDU, about 15% of it. Its 67.3% on time is 4 points worse than the route as a whole, which runs 71.7%. Ranked by on-time rate it is number four of five carriers on the route, where the range runs from Envoy at 77.7% to Republic at 64.3%. Three 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 MIA to RDU
Airline	Flights	On time	Avg delay	Cancelled	Grade
Envoy Airthin sample	104	77.7%	56 min	0.96%	B+
Frontier Airlinesthin sample	209	74.6%	61 min	1.91%	C
American Airlines	1,662	72.1%	72 min	1.44%	C
Delta Air Lines (this page)thin sample	360	67.3%	88 min	1.94%	C
Republic Airwaysthin sample	30	64.3%	80 min	6.67%	D−

Flight by flight

Delta flight numbers on MIA to RDU

DL 299218:2867.3% · 360 flights

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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 360 flights.

There are not enough flights in each departure window to split Delta's MIA to RDU 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

Delta on MIA to RDU through the year

Jul–Sep 202530 flights73.3%
Oct–Dec 202587 flights75.9%
Jan–Mar 202690 flights65.5%
Apr–Jun 202691 flights63.6%
Jul–Sep 202662 flights60.0%

Scale runs 50% to 80%.

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 360 flights.

Delta on MIA to RDU did not run the same all year. Its best quarter was Oct–Dec 2025 at 75.9% on time and its weakest Jul–Sep 2026 at 60.0%, a swing of 16 points on roughly 72 flights a quarter. The twelve-month rate averages over that, so if you are flying in a weak quarter the quarter's own figure is the better guide.

Across the week, Thursday is the strongest day at 82.4% on time and Sunday the weakest at 52.9%, a spread of 30 points.

Arrival by arrival

How late Delta on MIA to RDU runs when it is late

Delta on MIA to RDU often beats the schedule: 108 of 352 completed flights, 31%, arrived 15 minutes or more early. The 115 late arrivals split 29 under half an hour, 30 between 30 and 60 minutes, and 56 an hour or more.

15+ min early108 flights30.7%
Within 15 min129 flights36.6%
15–29 min late29 flights8.2%
30–59 min late30 flights8.5%
1–2 hours late28 flights8.0%
2+ hours late28 flights8.0%

Scale runs 0% to 100%.

Share of 352 completed flights by arrival against schedule.

Time lost at the gate mostly stays lost. Of 109 departures that left 15 minutes late or more, only 9 made it up before arrival. 15 flights left on time and still arrived late.

The worst days

Worst days for Delta on MIA to RDU

The latest arrival of the period was on 28 January 2026, 16 hours 39 minutes behind schedule; most of its delay minutes were filed as extreme weather. On three of the five worst days the largest share was filed as a late-arriving aircraft.

The latest arrivals of Delta on MIA to RDU in the period
Date	Arrived late by	Largest filed cause
28 January 2026	16 hours 39 minutes	Extreme weather
14 July 2026	6 hours 36 minutes	Late-arriving aircraft
1 March 2026	5 hours 32 minutes	Carrier
2 February 2026	5 hours 12 minutes	Late-arriving aircraft
6 July 2026	4 hours 55 minutes	Late-arriving aircraft

Delay causes

Why Delta runs late on this route

Late-arriving aircraft accounts for 62% of the 10,000 delay minutes carriers reported here, and the remaining four split what is left.

Late-arriving aircraft
62%
Carrier
15%
Extreme weather
14%
National Airspace System
9%

Extreme weather accounts for 14% of delay minutes, well above the single-digit share typical across the system. Weather delays are lumpy: they arrive as whole bad days rather than as a steady drag, so the monthly strip above is the more useful view of the risk. The national share is 6%, so this operation carries roughly 2.3 times the usual weather exposure. The split is drawn from 10,150 reported delay minutes.

62% of delay minutes trace back to a late-arriving aircraft, meaning the plane was already behind before it got here. Across 10,000 reported delay minutes here, that single category outweighs weather by 4 to one.

Cancellations sit at 1.94% against a national 1.89%, which is ordinary. Diversions add another 0.28%.

Connections and stage length

What a delay here costs

15.9% 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 700 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 84.2% on time across 360 flights, 17 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 17 points of difference.

One caution: this is a thin sample. 360 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 Delta on MIA to RDU

Put together: treat all of this as provisional. 360 flights over twelve months is enough to clear this site's floor and not enough to be confident to better than a couple of points. The 67.3% headline is the most reliable number on the page; the hour and month splits below it are built on a few dozen flights each. 352 completed flights over 12 months sit behind that.

Where to go next

Source: US DOT Bureau of Transportation Statistics, on-time performance data, September 2025 to August 2026. Last updated 22 October 2026; recomputed monthly. How this data is collected.

Key figures