Flight number record
DL 1614
Delta Air Lines · Salt Lake City to Ontario
- Route
- SLC → ONT
- Departs
- 22:59
- Flights
- 349
- Period
- September 2025 to August 2026
Historical statistics for September 2025 to August 2026, not live status. For today’s DL 1614, check with Delta Air Lines.
DL 1614 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 77.3%. When something does go wrong the average delay runs about an hour. That rests on 349 flights, with a median arrival 9 minutes early.
Set against the rest of the country, DL 1614's record is 11 points better than the US average of 77.3%. That gap is worth roughly 112 fewer late arrivals for every thousand flights.
Key figures
On time
88.5%
Arrivals under 15 minutes late, of 347 completed flights
Avg delay
63 min
Across delayed arrivals only, not all flights
Cancelled
0.57%
National rate is 1.89%
1 hour+ late
2.9%
National rate is 8.3%
These figures cover 349 flights between September 2025 and August 2026. The median arrival is 9 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 1614 flies
DL 1614 flies SLC to ONT without a single fixed slot. Its most common scheduled departure was 22:59, used on 104 of 349 flights, with 22:55 (61 flights) and 22:45 (49 flights) next.
- Departs 22:59104 flights29.8%
- Departs 22:5561 flights17.5%
- Departs 22:4549 flights14.0%
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 22:59 departure sits in the 8pm–5am window. Across every US flight scheduled in that window the on-time rate is 70.1%, and DL 1614 runs 18 points better at 88.5%. 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 1614 next to SLC to ONT
Every carrier on SLC to ONT combined arrived on time 88.9% of the time across 1,239 flights, so DL 1614 is about level with it. Delta flew 869 flights on the same city pair under all its flight numbers, including this one, and those ran 87.1% on time. Across its whole network Delta Air Lines managed 81.1%, which this flight beats by 7 points.
| Compared with | Flights | On time | Avg delay | Cancelled | Grade |
|---|---|---|---|---|---|
| DL 1614thin sample | 349 | 88.5% | 63 min | 0.57% | A+ |
| All Delta Air Lines on SLC–ONT | 869 | 87.1% | 60 min | 1.04% | A |
| All carriers on SLC–ONT | 1,239 | 88.9% | 61 min | 0.89% | A+ |
| Delta Air Lines, whole network | 1,039,517 | 81.1% | 71 min | 1.74% | B |
Across the year
DL 1614 quarter by quarter
Quarter by quarter DL 1614 held fairly steady: 83.3% in Jul–Sep 2025, 90.0% in Oct–Dec 2025, 89.3% in Jan–Mar 2026, 91.2% in Apr–Jun 2026 and 83.9% 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 flights83.3%
- Oct–Dec 202580 flights90.0%
- Jan–Mar 202686 flights89.3%
- Apr–Jun 202691 flights91.2%
- Jul–Sep 202662 flights83.9%
Scale runs 75% to 95%.
By weekday, DL 1614 did best on Thursday at 92.0% on time and worst on Saturday at 79.6%. Each day rests on about 50 flights, so a gap of 12 points is worth noticing but could still narrow in another year.
Arrival by arrival
How late DL 1614 runs when it is late
DL 1614 often beats the schedule: 118 of 347 completed flights, 34%, arrived 15 minutes or more early. Most of the lateness is short. 21 of the 40 late arrivals were under half an hour behind, and 10 reached an hour or more.
- 15+ min early118 flights34.0%
- Within 15 min189 flights54.5%
- 15–29 min late21 flights6.1%
- 30–59 min late9 flights2.6%
- 1–2 hours late7 flights2.0%
- 2+ hours late3 flights0.9%
Scale runs 0% to 100%.
Share of 347 completed flights by arrival against schedule.
A late pushback is often recovered here: of 46 departures that left 15 minutes late or more, 16 still arrived on time. 10 flights left on time and still arrived late.
The worst days
Worst days for DL 1614
The latest arrival of the period was on 17 July 2026, 8 hours 46 minutes behind schedule; most of its delay minutes were filed as carrier-caused (crew, maintenance, fuelling, baggage). The same cause led on three of the five worst days.
| Date | Arrived late by | Largest filed cause |
|---|---|---|
| 17 July 2026 | 8 hours 46 minutes | Carrier |
| 18 August 2026 | 7 hours 56 minutes | Carrier |
| 4 March 2026 | 2 hours 13 minutes | Late-arriving aircraft |
| 11 January 2026 | 1 hour 45 minutes | Carrier |
| 24 June 2026 | 1 hour 39 minutes | Late-arriving aircraft |
Delay causes
Why DL 1614 runs late
Carrier accounts for 72% of the 2,516 delay minutes carriers reported here, and the remaining four split what is left.
- 72%Carrier
- 16%Late-arriving aircraft
- 6%National Airspace System
- 5%Extreme weather
The largest share of delay minutes, 72%, falls under carrier control: crew scheduling, maintenance, fuelling, baggage. It accounts for 1,816 of the 2,516 delay minutes reported here. The split is drawn from 2,516 delay minutes reported on DL 1614.
Cancellations are rare at 0.57%, 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 2.9% 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 558 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.
The same number turns up on one other city pair in the data, including RSW to DTW (16), but none flew often enough under DL 1614 to report a rate for. Carriers move flight numbers between routes, so the figures on this page apply to SLC to ONT only.
One caution: this is a thin sample. 349 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 1614
For a booking, DL 1614 has one of the better records a US domestic flight can show: 88.5% on time and 0.57% cancelled. That is a base rate, not a promise about any single day.
Related
Where to go next
- SLC to ONT, every carrier and departure
- ONT to SLC, the return direction
- Salt Lake City International (SLC) delay statistics
- Ontario International (ONT) 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
- Worst months to fly in the US, ranked by the data
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.