Flight number record
DL 1434
Delta Air Lines · Los Angeles to Salt Lake City
- Route
- LAX → SLC
- Departs
- 09:55
- Flights
- 365
- Period
- September 2025 to August 2026
Historical statistics for September 2025 to August 2026, not live status. For today’s DL 1434, check with Delta Air Lines.
DL 1434 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 a little over an hour. That rests on 365 flights, with a median arrival 11 minutes early.
Set against the rest of the country, DL 1434's record is 15 points better than the US average of 77.3%. That gap is worth roughly 147 fewer late arrivals for every thousand flights.
Key figures
On time
92.0%
Arrivals under 15 minutes late, of 361 completed flights
Avg delay
80 min
Across delayed arrivals only, not all flights
Cancelled
0.82%
National rate is 1.89%
1 hour+ late
2.2%
National rate is 8.3%
These figures cover 365 flights between September 2025 and August 2026. The median arrival is 11 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 1434 flies
DL 1434 flies LAX to SLC without a single fixed slot. Its most common scheduled departure was 09:55, used on 165 of 365 flights, with 09:50 (72 flights) next.
- Departs 09:55165 flights45.2%
- Departs 09:5072 flights19.7%
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 09:55 departure sits in the 8am–11am window. Across every US flight scheduled in that window the on-time rate is 83.9%, and DL 1434 runs 8 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.
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Against the route
DL 1434 next to LAX to SLC
Every carrier on LAX to SLC combined arrived on time 87.2% of the time across 4,195 flights, so DL 1434 is 5 points ahead of it. Delta flew 2,457 flights on the same city pair under all its flight numbers, including this one, and those ran 88.4% on time. Across its whole network Delta Air Lines managed 81.1%, which this flight beats by 11 points.
| Compared with | Flights | On time | Avg delay | Cancelled | Grade |
|---|---|---|---|---|---|
| DL 1434 | 365 | 92.0% | 80 min | 0.82% | A+ |
| All Delta Air Lines on LAX–SLC | 2,457 | 88.4% | 80 min | 0.53% | A+ |
| All carriers on LAX–SLC | 4,195 | 87.2% | 72 min | 0.50% | A+ |
| Delta Air Lines, whole network | 1,039,517 | 81.1% | 71 min | 1.74% | B |
Across the year
DL 1434 quarter by quarter
Quarter by quarter DL 1434 held fairly steady: 90.0% in Jul–Sep 2025, 94.5% in Oct–Dec 2025, 89.7% in Jan–Mar 2026, 91.2% in Apr–Jun 2026 and 93.5% in Jul–Sep 2026. A spread of 5 points is about what a sample of this size moves on its own, so the annual figure is a fair summary.
- Jul–Sep 202530 flights90.0%
- Oct–Dec 202592 flights94.5%
- Jan–Mar 202690 flights89.7%
- Apr–Jun 202691 flights91.2%
- Jul–Sep 202662 flights93.5%
Scale runs 80% to 100%.
By weekday, DL 1434 ranged from 90.4% on Sunday to 92.3% on Monday. With about 52 flights behind each day, a spread of 2 points is inside normal variation, so the day you fly is not worth changing for this flight.
Arrival by arrival
How late DL 1434 runs when it is late
DL 1434 often beats the schedule: 132 of 361 completed flights, 37%, arrived 15 minutes or more early. The 29 late arrivals split 9 under half an hour, 12 between 30 and 60 minutes, and 8 an hour or more.
- 15+ min early132 flights36.6%
- Within 15 min200 flights55.4%
- 15–29 min late9 flights2.5%
- 30–59 min late12 flights3.3%
- 1–2 hours late3 flights0.8%
- 2+ hours late5 flights1.4%
Scale runs 0% to 100%.
Share of 361 completed flights by arrival against schedule.
A late pushback is often recovered here: of 43 departures that left 15 minutes late or more, 16 still arrived on time. Only 2 left on time and still arrived late.
The worst days
Worst days for DL 1434
The latest arrival of the period was on 30 April 2026, 12 hours 13 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 |
|---|---|---|
| 30 April 2026 | 12 hours 13 minutes | Carrier |
| 14 October 2025 | 3 hours 26 minutes | Carrier |
| 14 May 2026 | 2 hours 50 minutes | Late-arriving aircraft |
| 14 January 2026 | 2 hours 32 minutes | Carrier |
| 17 December 2025 | 2 hours 25 minutes | Carrier |
Delay causes
Why DL 1434 runs late
Carrier accounts for 76% of the 2,328 delay minutes carriers reported here, and the remaining four split what is left.
- 76%Carrier
- 21%Late-arriving aircraft
- 3%National Airspace System
The largest share of delay minutes, 76%, falls under carrier control: crew scheduling, maintenance, fuelling, baggage. It accounts for 1,772 of the 2,328 delay minutes reported here. The split is drawn from 2,328 delay minutes reported on DL 1434.
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 2.2% 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 590 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 1434 in the data flew LAX 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 1434
For a booking, DL 1434 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.
Related
Where to go next
- LAX to SLC, every carrier and departure
- SLC to LAX, the return direction
- Delta Air Lines 1647 on the same route85.4%
- Delta Air Lines 1318 on the same route91.7%
- Delta Air Lines 1194 on the same route88.5%
- Delta Air Lines 2311 on the same route78.7%
- Delta Air Lines 2906 on the same route95.4%
- Delta Air Lines 1483 on the same route86.6%
- Los Angeles International (LAX) delay statistics
- 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
- 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.