Flight number record
DL 1648
Delta Air Lines · Detroit to Denver
- Route
- DTW → DEN
- Departs
- 12:50
- Flights
- 364
- Period
- September 2025 to August 2026
Historical statistics for September 2025 to August 2026, not live status. For today’s DL 1648, check with Delta Air Lines.
DL 1648 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 364 flights, with a median arrival 7 minutes early.
Set against the rest of the country, DL 1648's record is 6 points better than the US average of 77.3%. That gap is worth roughly 64 fewer late arrivals for every thousand flights.
Key figures
On time
83.7%
Arrivals under 15 minutes late, of 363 completed flights
Avg delay
60 min
Across delayed arrivals only, not all flights
Cancelled
0.27%
National rate is 1.89%
1 hour+ late
5.0%
National rate is 8.3%
These figures cover 364 flights between September 2025 and August 2026. The median arrival is 7 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 1648 flies
DL 1648 flies DTW to DEN without a single fixed slot. Its most common scheduled departure was 12:50, used on 87 of 364 flights, with 12:42 (74 flights) and 12:15 (39 flights) next.
- Departs 12:5087 flights23.9%
- Departs 12:4274 flights20.3%
- Departs 12:1539 flights10.7%
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 12:50 departure sits in the 11am–2pm window. Across every US flight scheduled in that window the on-time rate is 78.3%, and DL 1648 runs 5 points better at 83.7%. Midday slots inherit some of the morning's delays without yet carrying the full weight of the evening's.
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Against the route
DL 1648 next to DTW to DEN
Every carrier on DTW to DEN combined arrived on time 79.5% of the time across 3,110 flights, so DL 1648 is 4 points ahead of it. Delta flew 1,248 flights on the same city pair under all its flight numbers, including this one, and those ran 79.2% on time. Across its whole network Delta Air Lines managed 81.1%, which this flight beats by 3 points.
| Compared with | Flights | On time | Avg delay | Cancelled | Grade |
|---|---|---|---|---|---|
| DL 1648thin sample | 364 | 83.7% | 60 min | 0.27% | B+ |
| All Delta Air Lines on DTW–DEN | 1,248 | 79.2% | 57 min | 0.16% | B+ |
| All carriers on DTW–DEN | 3,110 | 79.5% | 62 min | 0.51% | B+ |
| Delta Air Lines, whole network | 1,039,517 | 81.1% | 71 min | 1.74% | B |
Across the year
DL 1648 quarter by quarter
Quarter by quarter DL 1648 held fairly steady: 90.0% in Jul–Sep 2025, 81.1% in Oct–Dec 2025, 81.1% in Jan–Mar 2026, 87.9% in Apr–Jun 2026 and 82.3% in Jul–Sep 2026. A spread of 9 points is about what a sample of this size moves on its own, so the annual figure is a fair summary.
- Jul–Sep 202530 flights90.0%
- Oct–Dec 202591 flights81.1%
- Jan–Mar 202690 flights81.1%
- Apr–Jun 202691 flights87.9%
- Jul–Sep 202662 flights82.3%
Scale runs 75% to 95%.
By weekday, DL 1648 ranged from 80.4% on Sunday to 90.4% on Wednesday. With about 52 flights behind each day, a spread of 10 points is inside normal variation, so the day you fly is not worth changing for this flight.
Arrival by arrival
How late DL 1648 runs when it is late
DL 1648 often beats the schedule: 100 of 363 completed flights, 28%, arrived 15 minutes or more early. The 59 late arrivals split 18 under half an hour, 23 between 30 and 60 minutes, and 18 an hour or more.
- 15+ min early100 flights27.5%
- Within 15 min204 flights56.2%
- 15–29 min late18 flights5.0%
- 30–59 min late23 flights6.3%
- 1–2 hours late12 flights3.3%
- 2+ hours late6 flights1.7%
Scale runs 0% to 100%.
Share of 363 completed flights by arrival against schedule.
10 of 57 late departures made up the time and arrived on time, 18% of them. 12 flights left on time and still arrived late.
The worst days
Worst days for DL 1648
The latest arrival of the period was on 2 November 2025, 5 hours 11 minutes behind schedule; most of its delay minutes were filed as carrier-caused (crew, maintenance, fuelling, baggage). The five worst days are spread across November, February, July and March, with no single month standing out.
| Date | Arrived late by | Largest filed cause |
|---|---|---|
| 2 November 2025 | 5 hours 11 minutes | Carrier |
| 22 February 2026 | 4 hours 54 minutes | Late-arriving aircraft |
| 18 July 2026 | 3 hours 55 minutes | Carrier |
| 13 March 2026 | 2 hours 15 minutes | Extreme weather |
| 17 February 2026 | 2 hours 11 minutes | National Airspace System |
Delay causes
Why DL 1648 runs late
Carrier accounts for 43% of the 3,515 delay minutes carriers reported here, and the remaining four split what is left.
- 43%Carrier
- 27%National Airspace System
- 25%Late-arriving aircraft
- 5%Extreme weather
The largest share of delay minutes, 43%, falls under carrier control: crew scheduling, maintenance, fuelling, baggage. It accounts for 1,495 of the 3,515 delay minutes reported here. The split is drawn from 3,515 delay minutes reported on DL 1648.
Cancellations are rare at 0.27%, below the national 1.89% and low enough to earn the plus on the grade. Roughly one flight in 100 is called off; the risk here is arriving late, not not arriving.
Connections and routes
What a delay on this flight costs
5.0% 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 1,123 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.
The same number turns up on one other city pair in the data, including DEN to DTW (204), but none flew often enough under DL 1648 to report a rate for. Carriers move flight numbers between routes, so the figures on this page apply to DTW to DEN only.
One caution: this is a thin sample. 364 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 1648
For a booking, read DL 1648 as 83.7% on time with 0.27% cancelled over 364 flights. Those are rates from the past twelve months, not a forecast for any particular day.
Related
Where to go next
- DTW to DEN, every carrier and departure
- DEN to DTW, the return direction
- United Airlines 302 on the same route81.1%
- Delta Air Lines 1113 on the same route85.7%
- Delta Air Lines 2431 on the same route70.4%
- Detroit Metropolitan Wayne County (DTW) delay statistics
- Denver International (DEN) 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.