Flight number record
DL 1599
Delta Air Lines · Minneapolis to Madison
- Route
- MSP → MSN
- Departs
- 21:45
- Flights
- 349
- Period
- September 2025 to August 2026
Historical statistics for September 2025 to August 2026, not live status. For today’s DL 1599, check with Delta Air Lines.
DL 1599 lands a B, 6 points better than the national rate of 77.3%. About one flight in six arrives 15 minutes late or worse, and those flights are late by about an hour on average. That rests on 349 flights, with a median arrival 8 minutes early.
Set against the rest of the country, DL 1599's record is 6 points better than the US average of 77.3%. That gap is worth roughly 56 fewer late arrivals for every thousand flights.
Key figures
On time
82.9%
Arrivals under 15 minutes late, of 345 completed flights
Avg delay
66 min
Across delayed arrivals only, not all flights
Cancelled
1.15%
National rate is 1.89%
1 hour+ late
6.1%
National rate is 8.3%
These figures cover 349 flights between September 2025 and August 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.
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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 21:59 (44 flights) next.
- Departs 21:4562 flights17.8%
- Departs 21:5557 flights16.3%
- Departs 21:5944 flights12.6%
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 21:45 departure sits in the 8pm–5am window. Across every US flight scheduled in that window the on-time rate is 70.1%, and DL 1599 runs 13 points better at 82.9%. By that time of day most aircraft have flown several legs already, and whatever went wrong earlier is still in the schedule.
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Against the route
DL 1599 next to MSP to MSN
Every carrier on MSP to MSN combined arrived on time 81.9% of the time across 1,136 flights, so DL 1599 is about level with it. Across its whole network Delta Air Lines managed 81.1%, which this flight beats by 2 points.
| Compared with | Flights | On time | Avg delay | Cancelled | Grade |
|---|---|---|---|---|---|
| DL 1599thin sample | 349 | 82.9% | 66 min | 1.15% | B |
| All Delta Air Lines on MSP–MSNthin sample | 359 | 83.1% | 65 min | 1.11% | B |
| All carriers on MSP–MSN | 1,136 | 81.9% | 70 min | 0.97% | B+ |
| Delta Air Lines, whole network | 1,039,517 | 81.1% | 71 min | 1.74% | B |
Across the year
DL 1599 quarter by quarter
DL 1599 did not run the same all year. Its best quarter was Jul–Sep 2025 at 90.0% on time and its weakest Oct–Dec 2025 at 70.9%, a swing of 19 points on roughly 70 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 flights90.0%
- Oct–Dec 202580 flights70.9%
- Jan–Mar 202686 flights89.3%
- Apr–Jun 202691 flights85.6%
- Jul–Sep 202662 flights82.3%
Scale runs 60% to 95%.
By weekday, DL 1599 did best on Saturday at 93.8% on time and worst on Friday at 77.6%. Each day rests on about 50 flights, so a gap of 16 points is worth noticing but could still narrow in another year.
Arrival by arrival
How late DL 1599 runs when it is late
The 59 late arrivals split 16 under half an hour, 22 between 30 and 60 minutes, and 21 an hour or more.
- 15+ min early86 flights24.9%
- Within 15 min200 flights58.0%
- 15–29 min late16 flights4.6%
- 30–59 min late22 flights6.4%
- 1–2 hours late15 flights4.3%
- 2+ hours late6 flights1.7%
Scale runs 0% to 100%.
Share of 345 completed flights by arrival against schedule.
11 of 61 late departures made up the time and arrived on time, 18% of them. 9 flights left on time and still arrived late.
The worst days
Worst days for DL 1599
The latest arrival of the period was on 30 October 2025, 12 hours 15 minutes behind schedule; most of its delay minutes were filed as carrier-caused (crew, maintenance, fuelling, baggage). The five worst days are spread across October, November, December and August, with no single month standing out.
| Date | Arrived late by | Largest filed cause |
|---|---|---|
| 30 October 2025 | 12 hours 15 minutes | Carrier |
| 29 November 2025 | 2 hours 53 minutes | Extreme weather |
| 9 November 2025 | 2 hours 45 minutes | Late-arriving aircraft |
| 3 December 2025 | 2 hours 31 minutes | Late-arriving aircraft |
| 4 August 2026 | 2 hours 8 minutes | Carrier |
Delay causes
Why DL 1599 runs late
Carrier accounts for 50% of the 3,869 delay minutes carriers reported here, and the remaining four split what is left.
- 50%Carrier
- 30%Late-arriving aircraft
- 14%National Airspace System
- 7%Extreme weather
The largest share of delay minutes, 50%, falls under carrier control: crew scheduling, maintenance, fuelling, baggage. It accounts for 1,926 of the 3,869 delay minutes reported here. The split is drawn from 3,869 delay minutes reported on DL 1599.
Cancellations sit at 1.15% against a national 1.89%, which is ordinary. Diversions add another 0.00%.
Connections and routes
What a delay on this flight costs
6.1% of arrivals land an hour or more late, close to the national 8.3%, so 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 82.9% on time with 1.15% cancelled over 349 flights. Those are rates from the past twelve months, not a forecast for any particular day.
Related
Where to go next
- MSP to MSN, every carrier and departure
- MSN to MSP, the return direction
- Minneapolis-St Paul International (MSP) delay statistics
- Delta Air Lines on-time record
- Every Delta Air Lines flight number with a record
- The most and least reliable flight numbers in the US
- Worst months to fly in the US, ranked by the data
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 ; recomputed monthly. How this data is collected.