Flight number record

DL 1599

Delta Air Lines · Minneapolis to Madison

Route: MSP → MSN
Departs: 21:45
Flights: 349
Period: July 2025 to June 2026

Historical statistics for July 2025 to June 2026, not live status. For today’s DL 1599, check with Delta Air Lines.

DL 1599 lands a B, 5 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 about an hour on average. That is a workable record, not a spotless one. That rests on 349 flights, with a median arrival 8 minutes early.

Set against the rest of the country, DL 1599's record is 5 points better than the US average of 77.6%. That gap is worth roughly 47 fewer late arrivals for every thousand flights.

On time

82.3%

Arrivals under 15 minutes late, of 345 completed flights

Avg delay

61 min

Across delayed arrivals only, not all flights

Cancelled

1.15%

National rate is 1.81%

1 hour+ late

5.5%

National rate is 8.1%

These figures cover 349 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 1599 flies

DL 1599 flies MSP to MSN without a single fixed slot. Its most common scheduled departure was 21:45, used on 62 of 349 flights, with 21:55 (57 flights) and 22:30 (41 flights) next. Carriers retime flights through the season, so the rates here blend slightly different positions in the aircraft's day.

Departs 21:4562 flights17.8%
Departs 21:5557 flights16.3%
Departs 22:3041 flights11.7%

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 21:45 departure sits in the 8pm–5am window. Across every US flight scheduled in that window the on-time rate is 70.5%, and DL 1599 runs 12 points better at 82.3%. By that time of day most aircraft have flown several legs already, and whatever went wrong earlier is still in the schedule.

Against the route

DL 1599 next to MSP to MSN

Every carrier on MSP to MSN combined arrived on time 80.8% of the time across 1,104 flights, so DL 1599 is 2 points ahead of it. Across its whole network Delta Air Lines managed 81.6%, close to this flight's figure.

DL 1599 against its route and carrier
Compared with	Flights	On time	Avg delay	Cancelled	Grade
DL 1599thin sample	349	82.3%	61 min	1.15%	B
All Delta Air Lines on MSP–MSNthin sample	357	82.2%	60 min	1.12%	B
All carriers on MSP–MSN	1,104	80.8%	71 min	1.00%	B
Delta Air Lines, whole network	1,038,570	81.6%	71 min	1.62%	B

Across the year

DL 1599 quarter by quarter

DL 1599 did not run the same all year. Its best quarter was Jan–Mar 2026 at 89.3% on time and its weakest Oct–Dec 2025 at 70.9%, a swing of 18 points on roughly 87 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 flights82.6%
Oct–Dec 202580 flights70.9%
Jan–Mar 202686 flights89.3%
Apr–Jun 202691 flights85.6%

Scale runs 60% to 95%. Rows with fewer than 30 flights show a dash.

By weekday, DL 1599 did best on Saturday at 91.7% on time and worst on Sunday at 72.9%. Each day rests on about 50 flights, so a gap of 19 points is worth noticing but could still narrow in another year.

Delay causes

Why DL 1599 runs late

One category carries most of the weight here. Carrier accounts for 48% of the 3,738 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.

Carrier
48%
Late-arriving aircraft
33%
National Airspace System
13%
Extreme weather
7%

The largest share of delay minutes, 48%, 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 1,778 of the 3,738 delay minutes reported here. The split is drawn from 3,738 delay minutes reported on DL 1599.

Cancellations sit at 1.15% against a national 1.81%, which is ordinary. Diversions add another 0.00%.

Connections and routes

What a delay on this flight costs

5.5% of arrivals land an hour or more late, close to the national 8.1%. That is the figure that decides a connection, and it says a 60 to 75 minute layover is reasonable here while anything under 45 minutes is a bet. Most delays on this route last about an hour, which a normal layover absorbs.

The same number turns up on one other city pair in the data, including ATL to PNS (13), but none flew often enough under DL 1599 to report a rate for. Carriers move flight numbers between routes, so the figures on this page apply to MSP to MSN only.

One caution: this is a thin sample. 349 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 DL 1599

For a booking, read DL 1599 as 82.3% on time with 1.15% cancelled over 349 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