Flight number record
DL 1188
Delta Air Lines · Pittsburgh to Salt Lake City
- Route
- PIT → SLC
- Departs
- 17:40
- Flights
- 254
- Period
- September 2025 to August 2026
Historical statistics for September 2025 to August 2026, not live status. For today’s DL 1188, check with Delta Air Lines.
DL 1188 sits in the middle of the pack with a C. Close to three flights in four arrive on time by the DOT's definition, 4 points worse than the national rate of 77.3%. The late ones land about 35 minutes behind schedule. That rests on 254 flights, with a median arrival 3 minutes early.
Key figures
On time
73.5%
Arrivals under 15 minutes late, of 249 completed flights
Avg delay
34 min
Across delayed arrivals only, not all flights
Cancelled
1.57%
National rate is 1.89%
1 hour+ late
2.4%
National rate is 8.3%
These figures cover 254 flights between September 2025 and August 2026. The median arrival is 3 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 1188 flies
DL 1188 flies PIT to SLC without a single fixed slot. Its most common scheduled departure was 17:40, used on 74 of 254 flights, with 17:32 (62 flights) and 17:39 (29 flights) next.
- Departs 17:4074 flights29.1%
- Departs 17:3262 flights24.4%
- Departs 17:3929 flights11.4%
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 17:40 departure sits in the 5pm–8pm window. Across every US flight scheduled in that window the on-time rate is 68.0%, and DL 1188 runs 6 points better at 73.5%. 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 1188 next to PIT to SLC
Every carrier on PIT to SLC combined arrived on time 74.9% of the time across 363 flights, so DL 1188 is about level with it. Across its whole network Delta Air Lines managed 81.1%, which this flight trails by 8 points.
| Compared with | Flights | On time | Avg delay | Cancelled | Grade |
|---|---|---|---|---|---|
| DL 1188thin sample | 254 | 73.5% | 34 min | 1.57% | C |
| All Delta Air Lines on PIT–SLCthin sample | 363 | 74.9% | 38 min | 1.10% | C |
| All carriers on PIT–SLCthin sample | 363 | 74.9% | 38 min | 1.10% | C |
| Delta Air Lines, whole network | 1,039,517 | 81.1% | 71 min | 1.74% | B |
Across the year
DL 1188 quarter by quarter
DL 1188 did not run the same all year. Its best quarter was Apr–Jun 2026 at 82.4% on time and its weakest Jan–Mar 2026 at 70.1%, a swing of 12 points on roughly 85 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.
- Oct–Dec 202511 flights—
- Jan–Mar 202690 flights70.1%
- Apr–Jun 202691 flights82.4%
- Jul–Sep 202662 flights72.1%
Scale runs 60% to 90%. Rows with fewer than 30 flights show a dash.
By weekday, DL 1188 did best on Thursday at 85.7% on time and worst on Sunday at 68.6%. Each day rests on about 36 flights, so a gap of 17 points is worth noticing but could still narrow in another year.
Arrival by arrival
How late DL 1188 runs when it is late
DL 1188 often beats the schedule: 66 of 249 completed flights, 27%, arrived 15 minutes or more early. Most of the lateness is short. 38 of the 66 late arrivals were under half an hour behind, and 6 reached an hour or more.
- 15+ min early66 flights26.5%
- Within 15 min117 flights47.0%
- 15–29 min late38 flights15.3%
- 30–59 min late22 flights8.8%
- 1–2 hours late4 flights1.6%
- 2+ hours late2 flights0.8%
Scale runs 0% to 100%.
Share of 249 completed flights by arrival against schedule.
6 of 44 late departures made up the time and arrived on time, 14% of them. In the other direction, 28 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 1188
The latest arrival of the period was on 28 August 2026, 2 hours 28 minutes behind schedule; most of its delay minutes were filed as a late-arriving aircraft. The same cause led on three of the five worst days.
| Date | Arrived late by | Largest filed cause |
|---|---|---|
| 28 August 2026 | 2 hours 28 minutes | Late-arriving aircraft |
| 24 July 2026 | 2 hours 14 minutes | Late-arriving aircraft |
| 28 March 2026 | 1 hour 35 minutes | Carrier |
| 22 August 2026 | 1 hour 32 minutes | Extreme weather |
| 4 July 2026 | 1 hour 1 minute | Late-arriving aircraft |
Delay causes
Why DL 1188 runs late
Carriers report a reason for every delay minute they cause, in five DOT categories. The split below is by minutes, not by number of flights, so a handful of very long weather delays weighs as much as many short ones. It covers 2,272 reported delay minutes.
- 36%National Airspace System
- 33%Late-arriving aircraft
- 24%Carrier
- 7%Extreme weather
36% of delay minutes are charged to the National Airspace System: air traffic volume, runway configuration, ground stops. No carrier can price its way out of that, which is why airport choice moves the number here more than carrier choice does. That is 817 minutes out of 2,272, against a national NAS share of 21%. The split is drawn from 2,272 delay minutes reported on DL 1188.
Cancellations sit at 1.57% against a national 1.89%, which is ordinary. Diversions add another 0.39%.
Connections and routes
What a delay on this flight costs
Badly late arrivals are rare here: only 2.4% 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.
At 1,660 miles this is transcontinental flying, and long routes get a quiet structural advantage. Scheduled block time on a flight this length carries more padding in absolute minutes, so a twenty-minute late departure often still becomes an on-time arrival. Read the on-time rate here as slightly flattering next to a short-haul route with the same operational quality.
DL 1188 is not only a PIT to SLC flight. It also flew SLC to PIT (254 flights, 88.4% on time) often enough to be scored on its own. Airlines attach one number to several legs of an aircraft's day, and each leg keeps its own record here, so check which city pair is on your booking before reading a rate.
One caution: this is a thin sample. 254 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.
| Also flown as | Flights | On time | Avg delay | Cancelled | Grade |
|---|---|---|---|---|---|
| SLC to PITthin sample | 254 | 88.4% | 41 min | 1.57% | A |
What to do with this
Booking DL 1188
For a booking, read DL 1188 as 73.5% on time with 1.57% cancelled over 254 flights. Those are rates from the past twelve months, not a forecast for any particular day.
Related
Where to go next
- Pittsburgh International (PIT) 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
- Why the first flight of the morning is statistically safest
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.