Flight number record
DL 1744
Delta Air Lines · Salt Lake City to Boise
- Route
- SLC → BOI
- Departs
- 08:15
- Flights
- 320
- Period
- September 2025 to August 2026
Historical statistics for September 2025 to August 2026, not live status. For today’s DL 1744, check with Delta Air Lines.
DL 1744 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 13 points better than the national rate of 77.3%. When something does go wrong the average delay runs about an hour. That rests on 320 flights, with a median arrival 16 minutes early.
Set against the rest of the country, DL 1744's record is 13 points better than the US average of 77.3%. That gap is worth roughly 129 fewer late arrivals for every thousand flights.
Key figures
On time
90.2%
Arrivals under 15 minutes late, of 315 completed flights
Avg delay
59 min
Across delayed arrivals only, not all flights
Cancelled
1.56%
National rate is 1.89%
1 hour+ late
3.2%
National rate is 8.3%
These figures cover 320 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 1744 flies
DL 1744 flies SLC to BOI without a single fixed slot. Its most common scheduled departure was 08:15, used on 107 of 320 flights, with 08:50 (41 flights) and 08:59 (35 flights) next.
- Departs 08:15107 flights33.4%
- Departs 08:5041 flights12.8%
- Departs 08:5935 flights10.9%
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 08:15 departure sits in the 8am–11am window. Across every US flight scheduled in that window the on-time rate is 83.9%, and DL 1744 runs 6 points better at 90.2%. 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 1744 next to SLC to BOI
Every carrier on SLC to BOI combined arrived on time 86.3% of the time across 1,732 flights, so DL 1744 is 4 points ahead of it. Delta flew 1,219 flights on the same city pair under all its flight numbers, including this one, and those ran 84.0% on time. Across its whole network Delta Air Lines managed 81.1%, which this flight beats by 9 points.
| Compared with | Flights | On time | Avg delay | Cancelled | Grade |
|---|---|---|---|---|---|
| DL 1744thin sample | 320 | 90.2% | 59 min | 1.56% | A |
| All Delta Air Lines on SLC–BOI | 1,219 | 84.0% | 61 min | 1.07% | B |
| All carriers on SLC–BOI | 1,732 | 86.3% | 59 min | 0.81% | A+ |
| Delta Air Lines, whole network | 1,039,517 | 81.1% | 71 min | 1.74% | B |
Across the year
DL 1744 quarter by quarter
Quarter by quarter DL 1744 held fairly steady: 92.3% in Oct–Dec 2025, 88.2% in Jan–Mar 2026, 91.2% in Apr–Jun 2026 and 89.5% in Jul–Sep 2026. A spread of 4 points is about what a sample of this size moves on its own, so the annual figure is a fair summary.
- Jul–Sep 202524 flights—
- Oct–Dec 202580 flights92.3%
- Jan–Mar 202678 flights88.2%
- Apr–Jun 202681 flights91.2%
- Jul–Sep 202657 flights89.5%
Scale runs 80% to 100%. Rows with fewer than 30 flights show a dash.
By weekday, DL 1744 did best on Wednesday at 95.9% on time and worst on Monday at 83.0%. Each day rests on about 46 flights, so a gap of 13 points is worth noticing but could still narrow in another year.
Arrival by arrival
How late DL 1744 runs when it is late
DL 1744 often beats the schedule: 186 of 315 completed flights, 59%, arrived 15 minutes or more early. The 31 late arrivals split 15 under half an hour, 6 between 30 and 60 minutes, and 10 an hour or more.
- 15+ min early186 flights59.0%
- Within 15 min98 flights31.1%
- 15–29 min late15 flights4.8%
- 30–59 min late6 flights1.9%
- 1–2 hours late7 flights2.2%
- 2+ hours late3 flights1.0%
Scale runs 0% to 100%.
Share of 315 completed flights by arrival against schedule.
5 of 33 late departures made up the time and arrived on time, 15% of them. Only 3 left on time and still arrived late.
The worst days
Worst days for DL 1744
The latest arrival of the period was on 26 September 2025, 5 hours 52 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 |
|---|---|---|
| 26 September 2025 | 5 hours 52 minutes | Carrier |
| 22 March 2026 | 2 hours 49 minutes | Carrier |
| 27 June 2026 | 2 hours 13 minutes | Carrier |
| 17 April 2026 | 1 hour 44 minutes | Late-arriving aircraft |
| 6 November 2025 | 1 hour 41 minutes | Carrier |
Delay causes
Why DL 1744 runs late
Carrier accounts for 79% of the 1,828 delay minutes carriers reported here, and the remaining four split what is left.
- 79%Carrier
- 13%Late-arriving aircraft
- 8%National Airspace System
The largest share of delay minutes, 79%, falls under carrier control: crew scheduling, maintenance, fuelling, baggage. It accounts for 1,447 of the 1,828 delay minutes reported here. The split is drawn from 1,828 delay minutes reported on DL 1744.
Cancellations sit at 1.56% 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 3.2% 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 same number turns up on two other city pairs in the data, including BOI to SLC (242) and ATL to CHA (2), but none flew often enough under DL 1744 to report a rate for. Carriers move flight numbers between routes, so the figures on this page apply to SLC to BOI only.
One caution: this is a thin sample. 320 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 1744
For a booking, read DL 1744 as 90.2% on time with 1.56% cancelled over 320 flights. Those are rates from the past twelve months, not a forecast for any particular day.
Related
Where to go next
- SLC to BOI, every carrier and departure
- BOI to SLC, the return direction
- Delta Air Lines 2111 on the same route79.1%
- 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 to read this site: grades, sample sizes, and honest caveats
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.