Flight number record

DL 1744

Delta Air Lines · Salt Lake City to Boise

Route: SLC → BOI
Departs: 08:15
Flights: 322
Period: July 2025 to June 2026

Historical statistics for July 2025 to June 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 11 points better than the national rate of 77.6%. When something does go wrong the average delay runs about an hour. That rests on 322 flights, with a median arrival 15 minutes early.

Set against the rest of the country, DL 1744's record is 11 points better than the US average of 77.6%. That gap is worth roughly 114 fewer late arrivals for every thousand flights.

On time

89.0%

Arrivals under 15 minutes late, of 317 completed flights

Avg delay

59 min

Across delayed arrivals only, not all flights

Cancelled

1.55%

National rate is 1.81%

1 hour+ late

3.5%

National rate is 8.1%

These figures cover 322 flights between July 2025 and June 2026. The median arrival is 15 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.

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 120 of 322 flights, with 08:50 (41 flights) and 08:59 (35 flights) next. Carriers retime flights through the season, so the rates here blend slightly different positions in the aircraft's day.

Departs 08:15120 flights37.3%
Departs 08:5041 flights12.7%
Departs 08:5935 flights10.9%

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 08:15 departure sits in the 8am–11am window. Across every US flight scheduled in that window the on-time rate is 84.1%, and DL 1744 runs 5 points better at 89.0%. Early departures usually start with an aircraft that has not flown yet that day, which is most of why the window does well.

Against the route

DL 1744 next to SLC to BOI

Every carrier on SLC to BOI combined arrived on time 87.1% of the time across 1,742 flights, so DL 1744 is 2 points ahead of it. Delta flew 1,223 flights on the same city pair under all its flight numbers, including this one, and those ran 84.7% on time. Across its whole network Delta Air Lines managed 81.6%, which this flight beats by 7 points.

DL 1744 against its route and carrier
Compared with	Flights	On time	Avg delay	Cancelled	Grade
DL 1744thin sample	322	89.0%	59 min	1.55%	A
All Delta Air Lines on SLC–BOI	1,223	84.7%	59 min	1.06%	B
All carriers on SLC–BOI	1,742	87.1%	57 min	0.80%	A+
Delta Air Lines, whole network	1,038,570	81.6%	71 min	1.62%	B

Across the year

DL 1744 quarter by quarter

Quarter by quarter DL 1744 held fairly steady: 84.3% in Jul–Sep 2025, 92.3% in Oct–Dec 2025, 88.2% in Jan–Mar 2026 and 91.2% in Apr–Jun 2026. A spread of 8 points is about what a sample of this size moves on its own, so the annual figure is a fair summary.

Jul–Sep 202583 flights84.3%
Oct–Dec 202580 flights92.3%
Jan–Mar 202678 flights88.2%
Apr–Jun 202681 flights91.2%

Scale runs 75% to 100%. Rows with fewer than 30 flights show a dash.

By weekday, DL 1744 ranged from 84.4% on Saturday to 95.7% on Sunday. With about 46 flights behind each day, a spread of 11 points is inside normal variation, so the day you fly is not worth changing for this flight.

Delay causes

Why DL 1744 runs late

One category carries most of the weight here. Carrier accounts for 77% of the 2,060 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.

Carrier
77%
Late-arriving aircraft
13%
National Airspace System
6%
Extreme weather
4%

The largest share of delay minutes, 77%, 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 1,595 of the 2,060 delay minutes reported here. The split is drawn from 2,060 delay minutes reported on DL 1744.

Cancellations sit at 1.55% against a national 1.81%, 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 3.5% land an hour or more behind schedule, against 8.1% 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.

DL 1744 is not only a SLC to BOI flight. It also flew BOI to SLC (260 flights, 92.9% 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. 322 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.

Other routes flown as DL 1744
Also flown as	Flights	On time	Avg delay	Cancelled	Grade
BOI to SLCthin sample	260	92.9%	90 min	1.54%	A

What to do with this

Booking DL 1744

For a booking, read DL 1744 as 89.0% on time with 1.55% cancelled over 322 flights. Those are rates from the past twelve months, not a forecast for any particular day.

Where to go next

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.

Key figures