Flight number record
DL 2117
Delta Air Lines · Detroit to Salt Lake City
- Route
- DTW → SLC
- Departs
- 20:15
- Flights
- 363
- Period
- July 2025 to June 2026
Historical statistics for July 2025 to June 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 363 flights, with a median arrival 3 minutes late.
The national on-time rate over the same period is 77.6%, so DL 2117 runs 13 points behind the country as a whole. Across a thousand flights that is about 129 extra late arrivals.
Key figures
On time
64.7%
Arrivals under 15 minutes late, of 363 completed flights
Avg delay
64 min
Across delayed arrivals only, not all flights
Cancelled
0.00%
National rate is 1.81%
1 hour+ late
12.7%
National rate is 8.1%
These figures cover 363 flights between July 2025 and June 2026. Beyond the headline rate, 12.7% of arrivals land a full hour or more behind schedule. That is the number that wrecks a connection, and it is not visible in an on-time percentage alone.
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 72 of 363 flights, with 20:10 (41 flights) next. Carriers retime flights through the season, so the rates here blend slightly different positions in the aircraft's day.
- Departs 20:1572 flights19.8%
- Departs 20:1041 flights11.3%
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 20:15 departure sits in the 8pm–5am window. Across every US flight scheduled in that window the on-time rate is 70.5%, and DL 2117 runs 6 points worse at 64.7%. 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 2117 next to DTW to SLC
Every carrier on DTW to SLC combined arrived on time 80.4% of the time across 1,574 flights, so DL 2117 is 16 points behind it. Delta flew 1,546 flights on the same city pair under all its flight numbers, including this one, and those ran 80.0% on time. Across its whole network Delta Air Lines managed 81.6%, which this flight trails by 17 points.
| Compared with | Flights | On time | Avg delay | Cancelled | Grade |
|---|---|---|---|---|---|
| DL 2117thin sample | 363 | 64.7% | 64 min | 0.00% | D+ |
| All Delta Air Lines on DTW–SLC | 1,546 | 80.0% | 59 min | 0.19% | B+ |
| All carriers on DTW–SLC | 1,574 | 80.4% | 59 min | 0.19% | B+ |
| Delta Air Lines, whole network | 1,038,570 | 81.6% | 71 min | 1.62% | 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 72.5% on time and its weakest Jan–Mar 2026 at 47.8%, a swing of 25 points on roughly 91 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 202591 flights72.5%
- Oct–Dec 202591 flights71.4%
- Jan–Mar 202690 flights47.8%
- Apr–Jun 202691 flights67.0%
Scale runs 40% to 80%. Rows with fewer than 30 flights show a dash.
By weekday, DL 2117 did best on Tuesday at 73.6% on time and worst on Sunday at 59.6%. Each day rests on about 52 flights, so a gap of 14 points is worth noticing but could still narrow in another year.
Delay causes
Why DL 2117 runs late
One category carries most of the weight here. Carrier accounts for 64% of the 8,209 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.
- 64%Carrier
- 18%Late-arriving aircraft
- 16%National Airspace System
- 2%Extreme weather
The largest share of delay minutes, 64%, 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 5,275 of the 8,209 delay minutes reported here. The split is drawn from 8,209 delay minutes reported on DL 2117.
Cancellations are rare at 0.00%, below the national 1.81% 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
For anyone connecting, the number to weigh is not the on-time rate but the tail behind it. 12.7% of arrivals land a full hour or more behind schedule, against 8.1% nationally. A 45-minute layover does not survive that, and no amount of walking quickly changes it. Ninety minutes is the honest minimum 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. It is also long enough that the aircraft usually flies three or four legs a day rather than six, which slows how fast delay compounds.
Every one of the 363 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. 363 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. 12.7% 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 935 on the same route87.1%
- Delta Air Lines 698 on the same route89.0%
- Delta Air Lines 765 on the same route76.4%
- 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, July 2025 to June 2026. Last updated 15 September 2026; recomputed monthly. How this data is collected.