Flight profile · Delta Air Lines
DL1434
Los Angeles (LAX) to Salt Lake City (SLC) · scheduled 9:55 AM – 12:50 PM
How DL1434 performs
1,035 operations, July 2023 – July 2026.
DL1434 arrived on time 91.4% of the time, against 88.2% for all LAX → SLC flights, so this departure is 3.2 percentage points better than the route as a whole. Against Delta Air Lines’ own flights on this route it is 1.7 points better.
Source: US DOT Bureau of Transportation Statistics · 1,035 operations, July 2023 – July 2026 · If DL1434 is cancelled or significantly changed, DOT’s automatic refund rule may entitle you to your money back. The refund checker walks through eligibility.
What stands out
How DL1434 compares to other flight numbers, not just to itself.
This flight stays close to typical even on its worst days, a smaller gap than 91% of 11,788 comparable flight numbers.
A typical arrival is 12 min early, and the worst tenth are only 22 minutes worse than that.
Source: FlyerIntel analysis of US DOT BTS data · July 2023 – July 2026 · The one thing about this specific departure that ranks most extreme against every other published flight number, out of everything FlyerIntel checks — shown only when something clears a real statistical bar, not for every flight.
Where DL1434 is right now
A live reading, only if you ask for it. It is not part of the reliability record above.
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Against the rest of the route
| Flight or route | On time | Cancelled | Median delay | Severe | Flights |
|---|---|---|---|---|---|
| DL1434 | 91.4% | 0.58% | -12 min | 2.7% | 1,035 |
| Delta Air Lines on LAX → SLC | 89.7% | 0.37% | -11 min | 3.6% | 7,574 |
| All LAX → SLC flights | 88.2% | 0.32% | -10 min | 4.1% | 13,286 |
Source: FlyerIntel analysis of US DOT BTS data · July 2023 – July 2026
Why DL1434 runs late
Where US DOT attributed the delay minutes on this flight.
crew, maintenance, boarding and fueling, all within the carrier’s control
the inbound aircraft was late, so this flight started late
airspace and airport capacity, including weather-driven flow control
weather severe enough to stop this flight specifically
Share of the delay minutes US DOT attributed to each cause for DL1434 on LAX → SLC. Only delays of 15 minutes or more are attributed.
Source: US DOT Bureau of Transportation Statistics · Data covering July 2023 – July 2026
Does a late aircraft delay this flight?
How often the plane that flies DL1434 comes in late, and what that does to the departure.
The aircraft flying DL1434 came in 15 or more minutes late on 7% of the departures where its previous flight is known. There are not enough departures in both groups to say how the flight left after a late one and after an on-time one.
Each departure is matched to the flight the same aircraft flew into LAX just before it, using the tail number in the DOT file, 972 of 1,029 departures in all. A departure is left out when that flight is unknown, was cancelled or diverted, or the aircraft had sat for more than 12 hours. A flight the airline cancelled never left and is not in the count, and one flown by a substitute aircraft is matched to the aircraft that flew it, not to the one first planned.
Against the network at the same turn length
| Share of departures | Inbound landed 15+ late |
|---|---|
| DL1434 | 7% |
| Network, same turn | 17% |
The schedule leaves a normal turn: enough time to clean and board if the aircraft is on time, little to spare if it is not.
The network row is every flight with a scheduled turn of 60 to 89 minutes. How often DL1434’s aircraft landed 15 or more minutes late is lower than the network’s. There are not enough departures in both groups to compare how it left.
More: Which Flight Numbers Pay for a Late Aircraft lists the flight numbers that pass a late aircraft on.
Source: US DOT Bureau of Transportation Statistics · Data covering July 2023 – July 2026
From pushback to gate
When it leaves LAX late, does that still matter by the time it reaches SLC?
DL1434 pushes back an average of 5.8 minutes late and reaches the gate at SLC an average of 5.1 minutes early. The 10.9 minutes between those two figures are slack the published schedule already carries, which is why a late pushback on this flight does not reliably become a late arrival. It spends 15.0 minutes on the taxiways at LAX, 4.5 minutes shorter than a typical LAX departure in the same hour.
On arrival at SLC, DL1434 spends 6.3 min taxiing from touchdown to the gate — ground time a connecting passenger sits through before they can even leave the aircraft, on top of however late the flight itself ran. That is about what any arrival at SLC spends on the ground before reaching the gate.
Departure delay is averaged over every pushback and arrival delay over every completed arrival, so the two counts differ by the flights that never reached SLC. Taxi-out is gate to wheels up and sits inside the scheduled block rather than on top of it; the comparison is 50,307 departures from LAX scheduled in the clock hour DL1434 most often leaves in. Taxi-in is landing to gate, compared against every arrival FlyerIntel has on file at SLC (355,118 flights), not just DL1434’s own. More on taxi time.
Source: FlyerIntel analysis of US DOT BTS data · July 2023 – July 2026
The hour it leaves LAX
Part of any flight’s record belongs to the clock rather than to the flight. DL1434 has one departure time, so this is what that time is worth.
On-time arrival rate. 50,307 departures from LAX are scheduled in the 9 AM–10 AM hour over the period, against 595,153 across the whole day.
DL1434 is scheduled out of LAX at 9:55 AM, in the 9 AM–10 AM bank. Departures from LAX in that hour arrive on time 83.5% of the time against 81.4% across the airport’s whole day, so the hour DL1434 leaves in is an ordinary one for LAX and explains nothing about its record either way.
The two airport figures cover every departure from LAX to every destination, so they describe the slot rather than this journey — the like-for-like comparison against the route is above. Hours are scheduled local, and a number whose schedule moved between banks inside the period has no single hour and is not described here at all. Why the hour matters.
Source: FlyerIntel analysis of US DOT BTS data · July 2023 – July 2026 · Hours below 120 departures are not scored.
By day of week
Does DL1434 run worse on particular days?
Saturday is historically the most reliable day and Tuesday the least, a gap of 7.6 percentage points.
Source: FlyerIntel analysis of US DOT BTS data · July 2023 – July 2026 · Days with fewer than 120 operations are not scored.
Other routes DL1434 has flown
A flight number is a slot in a schedule, and carriers reassign it. These are the other city pairs this number served in the analysis period.
Because the same number has served different journeys, the statistics above describe only the route DL1434 currently operates. Blending them would produce an average of two different flights.
When it goes wrong
The average describes a usual day. This is the day that ruins a connection.
10 min late
against a median of 12 min early
Percentiles over 1,035 operations; cancelled and diverted flights are counted separately.
Source: US DOT Bureau of Transportation Statistics · Data covering July 2023 – July 2026
Other flights on this route
Same airports, same journey, different odds of arriving on time.
| Flight | Airline | On time | Median arrival | Operations |
|---|---|---|---|---|
| DL2906 | Delta Air Lines | 94.7% | 14 min early | 928 |
| DL1318 | Delta Air Lines | 92.8% | 12 min early | 782 |
| DL1194 | Delta Air Lines | 92.3% | 13 min early | 1,014 |
| DL1434 this flight | Delta Air Lines | 91.4% | 12 min early | 1,035 |
| OO5744 | SkyWest Airlines | 89.1% | 12 min early | 898 |
| DL1647 | Delta Air Lines | 87.0% | 10 min early | 1,037 |
| DL2311 | Delta Air Lines | 83.6% | 6 min early | 968 |
| DL1483 | Delta Air Lines | 83.5% | 9 min early | 777 |
Every departure listed carries at least 600 operations, so the comparison is between figures that mean something. DL1434 is placed in the same ordering rather than left out of it; the rows around it are the most punctual departures on the route, not all of them, so this is a comparison and not a rank. Schedules change; confirm the departure still operates before booking around this.
Data and methodology
Calculated by FlyerIntel from 1,035 records of DL1434 operating LAX → SLC, published by the US DOT Bureau of Transportation Statistics. A flight counts as delayed when it arrives 15 or more minutes after schedule. Cancelled and diverted flights are excluded from the on-time rate and reported separately. Flight numbers are resolved as carrier plus number plus route, because the same number serves different routes over time.
Full methodology · Data sources · Report a problem
Related research: Most and Least Reliable Flight Numbers · The Delay You Inherit · Making Up Time in the Air
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