Flight number record

DL 2129

Delta Air Lines · Minneapolis to Miami

Route: MSP → MIA
Departs: 08:50
Flights: 365
Period: September 2025 to August 2026

Historical statistics for September 2025 to August 2026, not live status. For today’s DL 2129, check with Delta Air Lines.

DL 2129 earns an A. More than four flights in five arrive inside the 15-minute window the DOT uses to define an on-time arrival, which puts it 8 points better than the national rate of 77.3%. When something does go wrong the average delay runs roughly 50 minutes. That rests on 365 flights, with a median arrival 9 minutes early.

Set against the rest of the country, DL 2129's record is 8 points better than the US average of 77.3%. That gap is worth roughly 80 fewer late arrivals for every thousand flights.

On time

85.3%

Arrivals under 15 minutes late, of 360 completed flights

Avg delay

48 min

Across delayed arrivals only, not all flights

Cancelled

1.10%

National rate is 1.89%

1 hour+ late

2.8%

National rate is 8.3%

These figures cover 365 flights between September 2025 and August 2026. The median arrival is 9 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.

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Schedule

When DL 2129 flies

DL 2129 flies MSP to MIA without a single fixed slot. Its most common scheduled departure was 08:50, used on 130 of 365 flights, with 08:55 (109 flights) next.

Departs 08:50130 flights35.6%
Departs 08:55109 flights29.9%

Scale runs 0% to 100%.

Share of scheduled departures at each local time. Times used on fewer than one flight in ten are not listed.

A 08:50 departure sits in the 8am–11am window. Across every US flight scheduled in that window the on-time rate is 83.9%, and DL 2129 runs level with that at 85.3%. Early departures usually start with an aircraft that has not flown yet that day, which is most of why the window does well.

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Against the route

DL 2129 next to MSP to MIA

Every carrier on MSP to MIA combined arrived on time 83.2% of the time across 1,140 flights, so DL 2129 is 2 points ahead of it. Delta flew 760 flights on the same city pair under all its flight numbers, including this one, and those ran 79.5% on time. Across its whole network Delta Air Lines managed 81.1%, which this flight beats by 4 points.

DL 2129 against its route and carrier
Compared with	Flights	On time	Avg delay	Cancelled	Grade
DL 2129	365	85.3%	48 min	1.10%	A
All Delta Air Lines on MSP–MIA	760	79.5%	50 min	0.79%	B+
All carriers on MSP–MIA	1,140	83.2%	63 min	0.88%	B+
Delta Air Lines, whole network	1,039,517	81.1%	71 min	1.74%	B

Across the year

DL 2129 quarter by quarter

DL 2129 did not run the same all year. Its best quarter was Apr–Jun 2026 at 90.1% on time and its weakest Jan–Mar 2026 at 77.3%, a swing of 13 points on roughly 91 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.

Jul–Sep 202530 flights—
Oct–Dec 202592 flights82.2%
Jan–Mar 202690 flights77.3%
Apr–Jun 202691 flights90.1%
Jul–Sep 202662 flights88.7%

Scale runs 70% to 95%. Rows with fewer than 30 flights show a dash.

By weekday, DL 2129 did best on Thursday at 94.2% on time and worst on Saturday at 78.4%. Each day rests on about 52 flights, so a gap of 16 points is worth noticing but could still narrow in another year.

Arrival by arrival

How late DL 2129 runs when it is late

DL 2129 often beats the schedule: 123 of 360 completed flights, 34%, arrived 15 minutes or more early. Most of the lateness is short. 28 of the 53 late arrivals were under half an hour behind, and 10 reached an hour or more.

15+ min early123 flights34.2%
Within 15 min184 flights51.1%
15–29 min late28 flights7.8%
30–59 min late15 flights4.2%
1–2 hours late6 flights1.7%
2+ hours late4 flights1.1%

Scale runs 0% to 100%.

Share of 360 completed flights by arrival against schedule.

10 of 39 late departures made up the time and arrived on time, 26% of them. In the other direction, 24 flights left on time yet arrived 15 minutes late or more, so that delay built up after pushback: in the air, in a holding pattern or on the ground at MIA.

The worst days

Worst days for DL 2129

The latest arrival of the period was on 16 March 2026, 5 hours 1 minute behind schedule; most of its delay minutes were filed as national airspace system delay. The same cause led on three of the five worst days.

The latest arrivals of DL 2129 in the period
Date	Arrived late by	Largest filed cause
16 March 2026	5 hours 1 minute	National Airspace System
1 July 2026	2 hours 55 minutes	Extreme weather
19 January 2026	2 hours 34 minutes	Extreme weather
26 December 2025	2 hours 26 minutes	National Airspace System
31 December 2025	1 hour 39 minutes	National Airspace System

Delay causes

Why DL 2129 runs late

National Airspace System accounts for 56% of the 2,523 delay minutes carriers reported here, and the remaining four split what is left.

National Airspace System
56%
Carrier
26%
Extreme weather
11%
Late-arriving aircraft
6%

Extreme weather accounts for 11% 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 quarterly figures above are the more useful view of the risk. The national share is 6%, so this operation carries roughly 1.9 times the usual weather exposure. The split is drawn from 2,523 delay minutes reported on DL 2129.

Cancellations sit at 1.10% against a national 1.89%, which is ordinary. Diversions add another 0.27%.

Connections and routes

What a delay on this flight costs

Badly late arrivals are rare here: only 2.8% land an hour or more behind schedule, against 8.3% 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.

At 1,501 miles this is transcontinental flying, and long routes get a quiet structural advantage. Scheduled block time on a flight this length carries more padding in absolute minutes, so a twenty-minute late departure often still becomes an on-time arrival. Read the on-time rate here as slightly flattering next to a short-haul route with the same operational quality.

DL 2129 is not only a MSP to MIA flight. It also flew MIA to MSP (364 flights, 76.7% on time) often enough to be scored on its own. Airlines attach one number to several legs of an aircraft's day, and each leg keeps its own record here, so check which city pair is on your booking before reading a rate.

One caution: this is a thin sample. 365 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.

Other routes flown as DL 2129
Also flown as	Flights	On time	Avg delay	Cancelled	Grade
MIA to MSPthin sample	364	76.7%	73 min	0.82%	B+

What to do with this

Booking DL 2129

For a booking, DL 2129 has one of the better records a US domestic flight can show: 85.3% on time and 1.10% cancelled. That is a base rate, not a promise about any single day.

Where to go next

A flight number here means Delta Air Lines’s own number as it reports to the DOT. How the figures are computed is on the methodology page.

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