Flight number record
DL 1129
Delta Air Lines · Denver to Minneapolis
- Route
- DEN → MSP
- Departs
- 06:00
- Flights
- 365
- Period
- September 2025 to August 2026
Historical statistics for September 2025 to August 2026, not live status. For today’s DL 1129, check with Delta Air Lines.
DL 1129 earns an A. Close to nine flights in ten arrive inside the 15-minute window the DOT uses to define an on-time arrival, which puts it 14 points better than the national rate of 77.3%. When something does go wrong the average delay runs about 2.1 hours. That rests on 365 flights, with a median arrival 16 minutes early.
Set against the rest of the country, DL 1129's record is 14 points better than the US average of 77.3%. That gap is worth roughly 144 fewer late arrivals for every thousand flights.
Key figures
On time
91.7%
Arrivals under 15 minutes late, of 361 completed flights
Avg delay
126 min
Across delayed arrivals only, not all flights
Cancelled
1.10%
National rate is 1.89%
1 hour+ late
4.4%
National rate is 8.3%
These figures cover 365 flights between September 2025 and August 2026. The median arrival is 16 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 1129 flies
DL 1129 flies DEN to MSP without a single fixed slot. Its most common scheduled departure was 06:00, used on 134 of 365 flights, with 06:05 (58 flights) and 05:45 (41 flights) next.
- Departs 06:00134 flights36.7%
- Departs 06:0558 flights15.9%
- Departs 05:4541 flights11.2%
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 06:00 departure sits in the 5am–8am window. Across every US flight scheduled in that window the on-time rate is 89.3%, and DL 1129 runs 2 points better at 91.7%. 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 1129 next to DEN to MSP
Every carrier on DEN to MSP combined arrived on time 78.5% of the time across 5,828 flights, so DL 1129 is 13 points ahead of it. Delta flew 1,796 flights on the same city pair under all its flight numbers, including this one, and those ran 82.2% on time. Across its whole network Delta Air Lines managed 81.1%, which this flight beats by 11 points.
| Compared with | Flights | On time | Avg delay | Cancelled | Grade |
|---|---|---|---|---|---|
| DL 1129 | 365 | 91.7% | 126 min | 1.10% | A |
| All Delta Air Lines on DEN–MSP | 1,796 | 82.2% | 68 min | 1.06% | B |
| All carriers on DEN–MSP | 5,828 | 78.5% | 63 min | 0.70% | B+ |
| Delta Air Lines, whole network | 1,039,517 | 81.1% | 71 min | 1.74% | B |
Across the year
DL 1129 quarter by quarter
DL 1129 did not run the same all year. Its best quarter was Jul–Sep 2025 at 100.0% on time and its weakest Jan–Mar 2026 at 88.8%, a swing of 11 points on roughly 73 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 flights100.0%
- Oct–Dec 202592 flights89.0%
- Jan–Mar 202690 flights88.8%
- Apr–Jun 202691 flights92.2%
- Jul–Sep 202662 flights95.1%
Scale runs 80% to 100%.
By weekday, DL 1129 ranged from 86.8% on Monday to 98.0% on Thursday. With about 52 flights behind each day, a spread of 11 points is inside normal variation, so the day you fly is not worth changing for this flight.
Arrival by arrival
How late DL 1129 runs when it is late
DL 1129 often beats the schedule: 197 of 361 completed flights, 55%, arrived 15 minutes or more early. When DL 1129 is late it tends to be very late: 16 of its 30 late arrivals were an hour or more behind, and 11 were two hours or more.
- 15+ min early197 flights54.6%
- Within 15 min134 flights37.1%
- 15–29 min late9 flights2.5%
- 30–59 min late5 flights1.4%
- 1–2 hours late5 flights1.4%
- 2+ hours late11 flights3.0%
Scale runs 0% to 100%.
Share of 361 completed flights by arrival against schedule.
Time lost at the gate mostly stays lost. Of 23 departures that left 15 minutes late or more, only 2 made it up before arrival. 9 flights left on time and still arrived late.
The worst days
Worst days for DL 1129
The latest arrival of the period was on 10 July 2026, 12 hours 55 minutes behind schedule; most of its delay minutes were filed as carrier-caused (crew, maintenance, fuelling, baggage). The same cause led on five of the five worst days.
| Date | Arrived late by | Largest filed cause |
|---|---|---|
| 10 July 2026 | 12 hours 55 minutes | Carrier |
| 3 April 2026 | 8 hours 12 minutes | Carrier |
| 12 January 2026 | 4 hours 51 minutes | Carrier |
| 11 November 2025 | 3 hours 43 minutes | Carrier |
| 12 March 2026 | 3 hours 35 minutes | Carrier |
Delay causes
Why DL 1129 runs late
Carrier accounts for 90% of the 3,787 delay minutes carriers reported here, and the remaining four split what is left.
- 90%Carrier
- 8%National Airspace System
- 2%Extreme weather
The largest share of delay minutes, 90%, falls under carrier control: crew scheduling, maintenance, fuelling, baggage. It accounts for 3,396 of the 3,787 delay minutes reported here. The split is drawn from 3,787 delay minutes reported on DL 1129.
Cancellations sit at 1.10% against a national 1.89%, which is ordinary. Diversions add another 0.00%.
Connections and routes
What a delay on this flight costs
Badly late arrivals are rare here: only 4.4% 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.
The 680 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.
Every one of the 365 flights under DL 1129 in the data flew DEN to MSP. The number was not reused on any other city pair, which makes this a clean record of one route.
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.
What to do with this
Booking DL 1129
For a booking, DL 1129 has one of the better records a US domestic flight can show: 91.7% on time and 1.10% cancelled. That is a base rate, not a promise about any single day.
Related
Where to go next
- DEN to MSP, every carrier and departure
- MSP to DEN, the return direction
- United Airlines 732 on the same route84.1%
- United Airlines 397 on the same route87.6%
- Frontier Airlines 1292 on the same route65.3%
- United Airlines 2076 on the same route74.4%
- Denver International (DEN) delay statistics
- 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.