Flight number record

DL 1440

Delta Air Lines · Spokane to Salt Lake City

Route: GEG → SLC
Departs: 06:00
Flights: 365
Period: September 2025 to August 2026

Historical statistics for September 2025 to August 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 15 points better than the national rate of 77.3%. When something does go wrong the average delay runs close to two hours. That rests on 365 flights, with a median arrival 14 minutes early.

Set against the rest of the country, DL 1440's record is 15 points better than the US average of 77.3%. That gap is worth roughly 152 fewer late arrivals for every thousand flights.

On time

92.5%

Arrivals under 15 minutes late, of 362 completed flights

Avg delay

122 min

Across delayed arrivals only, not all flights

Cancelled

0.82%

National rate is 1.89%

1 hour+ late

3.6%

National rate is 8.3%

These figures cover 365 flights between September 2025 and August 2026. The median arrival is 14 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.

Fare search by Aviasales, a Travelpayouts partner. Booking through it may earn this site a commission at no cost to you; it changes no figure here.

Schedule

When DL 1440 flies

DL 1440 flies GEG to SLC without a single fixed slot. Its most common scheduled departure was 06:00, used on 78 of 365 flights, with 05:30 (77 flights) and 05:20 (57 flights) next.

Departs 06:0078 flights21.4%
Departs 05:3077 flights21.1%
Departs 05:2057 flights15.6%

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 06:00 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 92.5%. Early departures usually start with an aircraft that has not flown yet that day, which is most of why the window does well.

Timetable by Aviasales, a Travelpayouts partner. Booking through it may earn this site a commission at no cost to you; it changes no figure here.

Against the route

DL 1440 next to GEG to SLC

Every carrier on GEG to SLC combined arrived on time 90.4% of the time across 1,668 flights, so DL 1440 is 2 points ahead of it. Delta flew 974 flights on the same city pair under all its flight numbers, including this one, and those ran 87.8% on time. Across its whole network Delta Air Lines managed 81.1%, which this flight beats by 11 points.

DL 1440 against its route and carrier
Compared with	Flights	On time	Avg delay	Cancelled	Grade
DL 1440	365	92.5%	122 min	0.82%	A+
All Delta Air Lines on GEG–SLC	974	87.8%	83 min	0.72%	A+
All carriers on GEG–SLC	1,668	90.4%	80 min	0.60%	A+
Delta Air Lines, whole network	1,039,517	81.1%	71 min	1.74%	B

Across the year

DL 1440 quarter by quarter

Quarter by quarter DL 1440 held fairly steady: 93.3% in Jul–Sep 2025, 93.4% in Oct–Dec 2025, 87.5% in Jan–Mar 2026, 95.6% in Apr–Jun 2026 and 93.5% in Jul–Sep 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 202530 flights93.3%
Oct–Dec 202592 flights93.4%
Jan–Mar 202690 flights87.5%
Apr–Jun 202691 flights95.6%
Jul–Sep 202662 flights93.5%

Scale runs 80% to 100%.

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.

Arrival by arrival

How late DL 1440 runs when it is late

DL 1440 often beats the schedule: 174 of 362 completed flights, 48%, arrived 15 minutes or more early. The 27 late arrivals split 5 under half an hour, 9 between 30 and 60 minutes, and 13 an hour or more.

15+ min early174 flights48.1%
Within 15 min161 flights44.5%
15–29 min late5 flights1.4%
30–59 min late9 flights2.5%
1–2 hours late6 flights1.7%
2+ hours late7 flights1.9%

Scale runs 0% to 100%.

Share of 362 completed flights by arrival against schedule.

7 of 33 late departures made up the time and arrived on time, 21% of them. Only 1 left on time and still arrived late.

The worst days

Worst days for DL 1440

The latest arrival of the period was on 20 September 2025, 8 hours 6 minutes behind schedule; most of its delay minutes were filed as a late-arriving aircraft. The same cause led on four of the five worst days.

The latest arrivals of DL 1440 in the period
Date	Arrived late by	Largest filed cause
20 September 2025	8 hours 6 minutes	Late-arriving aircraft
26 January 2026	8 hours 2 minutes	Carrier
5 February 2026	6 hours 53 minutes	Late-arriving aircraft
12 June 2026	5 hours 20 minutes	Late-arriving aircraft
13 July 2026	3 hours 33 minutes	Late-arriving aircraft

Delay causes

Why DL 1440 runs late

Late-arriving aircraft accounts for 59% of the 3,283 delay minutes carriers reported here, and the remaining four split what is left.

Late-arriving aircraft
59%
Carrier
35%
National Airspace System
4%
Extreme weather
2%

59% of delay minutes trace back to a late-arriving aircraft, meaning the plane was already behind before it got here. Across 3,283 reported delay minutes here, that single category outweighs weather by 31 to one. The split is drawn from 3,283 delay minutes reported on DL 1440.

Cancellations are rare at 0.82%, below the national 1.89% 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 3.6% 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 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.

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: 92.5% 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, September 2025 to August 2026. Last updated 22 October 2026; recomputed monthly. How this data is collected.

Key figures