Flight number record

DL 1440

Delta Air Lines · Spokane to Salt Lake City

Route: GEG → SLC
Departs: 05:45
Flights: 365
Period: July 2025 to June 2026

Historical statistics for July 2025 to June 2026, not live status. For today’s DL 1440, check with Delta Air Lines.

DL 1440 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 14 points better than the national rate of 77.6%. When something does go wrong the average delay runs about 2.1 hours. That rests on 365 flights, with a median arrival 13 minutes early.

Set against the rest of the country, DL 1440's record is 14 points better than the US average of 77.6%. That gap is worth roughly 144 fewer late arrivals for every thousand flights.

On time

92.0%

Arrivals under 15 minutes late, of 362 completed flights

Avg delay

126 min

Across delayed arrivals only, not all flights

Cancelled

0.82%

National rate is 1.81%

1 hour+ late

4.1%

National rate is 8.1%

These figures cover 365 flights between July 2025 and June 2026. The median arrival is 13 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 1440 flies

DL 1440 flies GEG to SLC without a single fixed slot. Its most common scheduled departure was 05:45, used on 92 of 365 flights, with 06:00 (78 flights) and 05:30 (48 flights) next. Carriers retime flights through the season, so the rates here blend slightly different positions in the aircraft's day.

Departs 05:4592 flights25.2%
Departs 06:0078 flights21.4%
Departs 05:3048 flights13.2%

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 05:45 departure sits in the 5am–8am window. Across every US flight scheduled in that window the on-time rate is 89.3%, and DL 1440 runs 3 points better at 92.0%. 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 1440 next to GEG to SLC

Every carrier on GEG to SLC combined arrived on time 90.6% of the time across 1,666 flights, so DL 1440 is about level with it. Delta flew 927 flights on the same city pair under all its flight numbers, including this one, and those ran 88.1% on time. Across its whole network Delta Air Lines managed 81.6%, which this flight beats by 10 points.

DL 1440 against its route and carrier
Compared with	Flights	On time	Avg delay	Cancelled	Grade
DL 1440	365	92.0%	126 min	0.82%	A+
All Delta Air Lines on GEG–SLC	927	88.1%	91 min	0.86%	A+
All carriers on GEG–SLC	1,666	90.6%	85 min	0.66%	A+
Delta Air Lines, whole network	1,038,570	81.6%	71 min	1.62%	B

Across the year

DL 1440 quarter by quarter

Quarter by quarter DL 1440 held fairly steady: 91.3% in Jul–Sep 2025, 93.4% in Oct–Dec 2025, 87.5% in Jan–Mar 2026 and 95.6% 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 202592 flights91.3%
Oct–Dec 202592 flights93.4%
Jan–Mar 202690 flights87.5%
Apr–Jun 202691 flights95.6%

Scale runs 80% to 100%. Rows with fewer than 30 flights show a dash.

By weekday, DL 1440 ranged from 86.3% on Saturday to 96.2% on Tuesday. With about 52 flights behind each day, a spread of 10 points is inside normal variation, so the day you fly is not worth changing for this flight.

Delay causes

Why DL 1440 runs late

One category carries most of the weight here. Late-arriving aircraft accounts for 51% of the 3,654 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.

Late-arriving aircraft
51%
Carrier
44%
National Airspace System
4%
Extreme weather
2%

51% of delay minutes trace back to a late-arriving aircraft, meaning the plane was already behind before it got here. That is a cascade, and cascades start small and grow through the day. Across 3,654 reported delay minutes here, that single category outweighs weather by 29 to one. It is the strongest argument for booking the first departure of the morning, when the aircraft has been sitting at the gate overnight with nothing to inherit. The split is drawn from 3,654 delay minutes reported on DL 1440.

Cancellations are rare at 0.82%, below the national 1.81% and low enough to earn the plus on the grade. Roughly one flight in 100 is called off; the risk here is arriving late, not not arriving.

Connections and routes

What a delay on this flight costs

Badly late arrivals are rare here: only 4.1% 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.

The 546 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 365 flights under DL 1440 in the data flew GEG 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. 365 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 1440

For a booking, DL 1440 has one of the better records a US domestic flight can show: 92.0% on time and 0.82% cancelled. That is a base rate, not a promise about any single 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