Flight number record
DL 339
Delta Air Lines · Salt Lake City to Burbank
- Route
- SLC → BUR
- Departs
- 20:50
- Flights
- 312
- Period
- July 2025 to June 2026
Historical statistics for July 2025 to June 2026, not live status. For today’s DL 339, check with Delta Air Lines.
DL 339 lands a B+, 5 points better than the national rate of 77.6%. About one flight in six arrives 15 minutes late or worse, and those flights are late by close to two hours on average. That is a workable record, not a spotless one. That rests on 312 flights, with a median arrival 6 minutes early.
Set against the rest of the country, DL 339's record is 5 points better than the US average of 77.6%. That gap is worth roughly 50 fewer late arrivals for every thousand flights.
Key figures
On time
82.6%
Arrivals under 15 minutes late, of 311 completed flights
Avg delay
106 min
Across delayed arrivals only, not all flights
Cancelled
0.00%
National rate is 1.81%
1 hour+ late
6.1%
National rate is 8.1%
These figures cover 312 flights between July 2025 and June 2026. The median arrival is 6 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 339 flies
DL 339 flies SLC to BUR without a single fixed slot. Its most common scheduled departure was 20:50, used on 128 of 312 flights, with 20:45 (87 flights) and 20:55 (62 flights) next. Carriers retime flights through the season, so the rates here blend slightly different positions in the aircraft's day.
- Departs 20:50128 flights41.0%
- Departs 20:4587 flights27.9%
- Departs 20:5562 flights19.9%
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 20:50 departure sits in the 8pm–5am window. Across every US flight scheduled in that window the on-time rate is 70.5%, and DL 339 runs 12 points better at 82.6%. By that time of day most aircraft have flown several legs already, and whatever went wrong earlier is still in the schedule.
Against the route
DL 339 next to SLC to BUR
Every carrier on SLC to BUR combined arrived on time 86.0% of the time across 1,484 flights, so DL 339 is 3 points behind it. Across its whole network Delta Air Lines managed 81.6%, close to this flight's figure.
| Compared with | Flights | On time | Avg delay | Cancelled | Grade |
|---|---|---|---|---|---|
| DL 339thin sample | 312 | 82.6% | 106 min | 0.00% | B+ |
| All Delta Air Lines on SLC–BUR | 394 | 81.6% | 98 min | 0.00% | B+ |
| All carriers on SLC–BUR | 1,484 | 86.0% | 67 min | 0.40% | A+ |
| Delta Air Lines, whole network | 1,038,570 | 81.6% | 71 min | 1.62% | B |
Across the year
DL 339 quarter by quarter
Quarter by quarter DL 339 held fairly steady: 81.3% in Jul–Sep 2025, 82.4% in Oct–Dec 2025, 82.6% in Jan–Mar 2026 and 84.8% in Apr–Jun 2026. A spread of 4 points is about what a sample of this size moves on its own, so the annual figure is a fair summary.
- Jul–Sep 202591 flights81.3%
- Oct–Dec 202569 flights82.4%
- Jan–Mar 202686 flights82.6%
- Apr–Jun 202666 flights84.8%
Scale runs 75% to 90%. Rows with fewer than 30 flights show a dash.
By weekday, DL 339 did best on Saturday at 95.6% on time and worst on Sunday at 75.6%. Each day rests on about 45 flights, so a gap of 20 points is worth noticing but could still narrow in another year.
Delay causes
Why DL 339 runs late
One category carries most of the weight here. Carrier accounts for 81% of the 5,702 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.
- 81%Carrier
- 15%Late-arriving aircraft
- 3%National Airspace System
The largest share of delay minutes, 81%, falls under carrier control: crew scheduling, maintenance, fuelling, baggage. Unlike weather, that is a management outcome, and it is the category where the gap between two carriers on the same schedule is genuinely earned. It accounts for 4,628 of the 5,702 delay minutes reported here. The split is drawn from 5,702 delay minutes reported on DL 339.
Cancellations are rare at 0.00%, below the national 1.81% and low enough to earn the plus on the grade. Almost no flights are called off; the risk here is arriving late, not not arriving.
Connections and routes
What a delay on this flight costs
6.1% of arrivals land an hour or more late, close to the national 8.1%. That is the figure that decides a connection, and it says a 60 to 75 minute layover is reasonable here while anything under 45 minutes is a bet. Most delays on this route last close to two hours, which a normal layover absorbs.
The 574 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.
The same number turns up on two other city pairs in the data, including TPA to LAX (21) and ATL to PHX (16), but none flew often enough under DL 339 to report a rate for. Carriers move flight numbers between routes, so the figures on this page apply to SLC to BUR only.
One caution: this is a thin sample. 312 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 339
For a booking, read DL 339 as 82.6% on time with 0.00% cancelled over 312 flights. Those are rates from the past twelve months, not a forecast for any particular day.
Related
Where to go next
- SLC to BUR, every carrier and departure
- BUR to SLC, the return direction
- 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, July 2025 to June 2026. Last updated 15 September 2026; recomputed monthly. How this data is collected.