Flight number record

DL 2129

Delta Air Lines · Minneapolis to Miami

Route: MSP → MIA
Departs: 08:50
Flights: 365
Period: July 2025 to June 2026

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

DL 2129 lands a B, 6 points better than the national rate of 77.6%. About one flight in six arrives 15 minutes late or worse, and those flights are late by roughly 45 minutes on average. That is a workable record, not a spotless one. That rests on 365 flights, with a median arrival 8 minutes early.

Set against the rest of the country, DL 2129's record is 6 points better than the US average of 77.6%. That gap is worth roughly 62 fewer late arrivals for every thousand flights.

On time

83.8%

Arrivals under 15 minutes late, of 359 completed flights

Avg delay

43 min

Across delayed arrivals only, not all flights

Cancelled

1.10%

National rate is 1.81%

1 hour+ late

2.5%

National rate is 8.1%

These figures cover 365 flights between July 2025 and June 2026. The median arrival is 8 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.

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 101 of 365 flights, with 08:55 (81 flights) and 09:00 (70 flights) next. Carriers retime flights through the season, so the rates here blend slightly different positions in the aircraft's day.

Departs 08:50101 flights27.7%
Departs 08:5581 flights22.2%
Departs 09:0070 flights19.2%

Scale runs 0% to 100%. Rows with fewer than 30 flights show a dash.

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 84.1%, and DL 2129 runs level with that at 83.8%. Early departures usually start with an aircraft that has not flown yet that day, which is most of why the window does well.

Against the route

DL 2129 next to MSP to MIA

Every carrier on MSP to MIA combined arrived on time 82.4% of the time across 1,125 flights, so DL 2129 is about level with it. Delta flew 760 flights on the same city pair under all its flight numbers, including this one, and those ran 78.2% on time. Across its whole network Delta Air Lines managed 81.6%, which this flight beats by 2 points.

DL 2129 against its route and carrier
Compared with	Flights	On time	Avg delay	Cancelled	Grade
DL 2129	365	83.8%	43 min	1.10%	B
All Delta Air Lines on MSP–MIA	760	78.2%	47 min	0.79%	B+
All carriers on MSP–MIA	1,125	82.4%	63 min	0.89%	B+
Delta Air Lines, whole network	1,038,570	81.6%	71 min	1.62%	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 202592 flights85.6%
Oct–Dec 202592 flights82.2%
Jan–Mar 202690 flights77.3%
Apr–Jun 202691 flights90.1%

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

By weekday, DL 2129 did best on Thursday at 94.1% on time and worst on Saturday at 72.5%. Each day rests on about 52 flights, so a gap of 22 points is worth noticing but could still narrow in another year.

Delay causes

Why DL 2129 runs late

One category carries most of the weight here. National Airspace System accounts for 63% of the 2,465 delay minutes carriers reported, and the remaining four split what is left. The split is by minutes rather than by flights, so a few very long delays count for as much as many short ones.

National Airspace System
63%
Carrier
24%
Extreme weather
7%
Late-arriving aircraft
6%

63% of delay minutes are charged to the National Airspace System: air traffic volume, runway configuration, ground stops. No carrier can price its way out of that, which is why airport choice moves the number here more than carrier choice does. That is 1,547 minutes out of 2,465, against a national NAS share of 21%. The split is drawn from 2,465 delay minutes reported on DL 2129.

Cancellations sit at 1.10% against a national 1.81%, which is ordinary. Diversions add another 0.55%.

Connections and routes

What a delay on this flight costs

Badly late arrivals are rare here: only 2.5% 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.

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, 76.9% 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	76.9%	71 min	0.82%	B+

What to do with this

Booking DL 2129

For a booking, read DL 2129 as 83.8% on time with 1.10% cancelled over 365 flights. Those are rates from the past twelve months, not a forecast for any particular 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, July 2025 to June 2026. Last updated 15 September 2026; recomputed monthly. How this data is collected.

Key figures