Flight number record
DL 2117
Delta Air Lines · Detroit to Salt Lake City
- Route
- DTW → SLC
- Departs
- 20:15
- Flights
- 364
- Period
- September 2025 to August 2026
Historical statistics for September 2025 to August 2026, not live status. For today’s DL 2117, check with Delta Air Lines.
DL 2117 draws a D+. About one flight in three arrives at least 15 minutes late, and the typical late arrival is about an hour behind schedule. Build slack into anything you connect to. That rests on 364 flights, with a median arrival 3 minutes late.
The national on-time rate over the same period is 77.3%, so DL 2117 runs 13 points behind the country as a whole. Across a thousand flights that is about 127 extra late arrivals.
Key figures
On time
64.6%
Arrivals under 15 minutes late, of 364 completed flights
Avg delay
67 min
Across delayed arrivals only, not all flights
Cancelled
0.00%
National rate is 1.89%
1 hour+ late
14.8%
National rate is 8.3%
These figures cover 364 flights between September 2025 and August 2026. Beyond the headline rate, 14.8% of arrivals land a full hour or more behind schedule, against 8.3% nationally.
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Schedule
When DL 2117 flies
DL 2117 flies DTW to SLC without a single fixed slot. Its most common scheduled departure was 20:15, used on 107 of 364 flights.
- Departs 20:15107 flights29.4%
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 20:15 departure sits in the 8pm–5am window. Across every US flight scheduled in that window the on-time rate is 70.1%, and DL 2117 runs 6 points worse at 64.6%. 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 2117 next to DTW to SLC
Every carrier on DTW to SLC combined arrived on time 79.6% of the time across 1,535 flights, so DL 2117 is 15 points behind it. Delta flew 1,533 flights on the same city pair under all its flight numbers, including this one, and those ran 79.6% on time. Across its whole network Delta Air Lines managed 81.1%, which this flight trails by 17 points.
| Compared with | Flights | On time | Avg delay | Cancelled | Grade |
|---|---|---|---|---|---|
| DL 2117thin sample | 364 | 64.6% | 67 min | 0.00% | D+ |
| All Delta Air Lines on DTW–SLC | 1,533 | 79.6% | 60 min | 0.13% | B+ |
| All carriers on DTW–SLC | 1,535 | 79.6% | 60 min | 0.13% | B+ |
| Delta Air Lines, whole network | 1,039,517 | 81.1% | 71 min | 1.74% | B |
Across the year
DL 2117 quarter by quarter
DL 2117 did not run the same all year. Its best quarter was Jul–Sep 2025 at 86.7% on time and its weakest Jan–Mar 2026 at 47.8%, a swing of 39 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 flights86.7%
- Oct–Dec 202591 flights71.4%
- Jan–Mar 202690 flights47.8%
- Apr–Jun 202691 flights67.0%
- Jul–Sep 202662 flights64.5%
Scale runs 40% to 90%.
By weekday, DL 2117 did best on Thursday at 70.6% on time and worst on Sunday at 57.7%. Each day rests on about 52 flights, so a gap of 13 points is worth noticing but could still narrow in another year.
Arrival by arrival
How late DL 2117 runs when it is late
The 129 late arrivals split 39 under half an hour, 36 between 30 and 60 minutes, and 54 an hour or more.
- 15+ min early45 flights12.4%
- Within 15 min190 flights52.2%
- 15–29 min late39 flights10.7%
- 30–59 min late36 flights9.9%
- 1–2 hours late37 flights10.2%
- 2+ hours late17 flights4.7%
Scale runs 0% to 100%.
Share of 364 completed flights by arrival against schedule.
16 of 121 late departures made up the time and arrived on time, 13% of them. In the other direction, 24 flights left on time yet arrived 15 minutes late or more, so that delay built up after pushback: in the air, in a holding pattern or on the ground at SLC.
The worst days
Worst days for DL 2117
The latest arrival of the period was on 13 June 2026, 12 hours 45 minutes behind schedule; most of its delay minutes were filed as carrier-caused (crew, maintenance, fuelling, baggage). The same cause led on four of the five worst days.
| Date | Arrived late by | Largest filed cause |
|---|---|---|
| 13 June 2026 | 12 hours 45 minutes | Carrier |
| 20 December 2025 | 4 hours 34 minutes | Late-arriving aircraft |
| 22 February 2026 | 3 hours 56 minutes | Carrier |
| 16 March 2026 | 3 hours 34 minutes | Carrier |
| 11 August 2026 | 3 hours 16 minutes | Carrier |
Delay causes
Why DL 2117 runs late
Carrier accounts for 65% of the 8,633 delay minutes carriers reported here, and the remaining four split what is left.
- 65%Carrier
- 18%Late-arriving aircraft
- 16%National Airspace System
- 1%Extreme weather
The largest share of delay minutes, 65%, falls under carrier control: crew scheduling, maintenance, fuelling, baggage. It accounts for 5,630 of the 8,633 delay minutes reported here. The split is drawn from 8,633 delay minutes reported on DL 2117.
Cancellations are rare at 0.00%, below the national 1.89% and low enough to earn the plus on the grade. Almost no flights are called off; the risk here is arriving late, not not arriving.
Connections and routes
What a delay on this flight costs
14.8% of arrivals land a full hour or more behind schedule, against 8.3% nationally. Ninety minutes is the honest minimum for a connection here, and two hours if the onward flight is on a separate ticket.
The 1,481 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 364 flights under DL 2117 in the data flew DTW to SLC. 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. 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 2117
For a booking, DL 2117 is a flight to put a long connection behind. 14.8% of its completed flights arrived an hour or more late, which a short layover will not absorb. If the onward flight is on a separate ticket, the risk sits with you.
Related
Where to go next
- DTW to SLC, every carrier and departure
- SLC to DTW, the return direction
- Delta Air Lines 698 on the same route87.9%
- Delta Air Lines 935 on the same route87.4%
- Delta Air Lines 765 on the same route76.7%
- Detroit Metropolitan Wayne County (DTW) delay statistics
- Salt Lake City International (SLC) 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
- How often a connection fails at the major US hubs
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.