Flight number record
DL 339
Delta Air Lines · Salt Lake City to Burbank
- Route
- SLC → BUR
- Departs
- 20:50
- Flights
- 313
- Period
- September 2025 to August 2026
Historical statistics for September 2025 to August 2026, not live status. For today’s DL 339, check with Delta Air Lines.
DL 339 lands a B+, 6 points better than the national rate of 77.3%. About one flight in six arrives 15 minutes late or worse, and those flights are late by about an hour on average. That rests on 313 flights, with a median arrival 6 minutes early.
Set against the rest of the country, DL 339's record is 6 points better than the US average of 77.3%. That gap is worth roughly 57 fewer late arrivals for every thousand flights.
Key figures
On time
83.0%
Arrivals under 15 minutes late, of 312 completed flights
Avg delay
58 min
Across delayed arrivals only, not all flights
Cancelled
0.00%
National rate is 1.89%
1 hour+ late
5.4%
National rate is 8.3%
These figures cover 313 flights between September 2025 and August 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.
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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 150 of 313 flights, with 20:45 (66 flights) and 20:55 (62 flights) next.
- Departs 20:50150 flights47.9%
- Departs 20:4566 flights21.1%
- Departs 20:5562 flights19.8%
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 20:50 departure sits in the 8pm–5am window. Across every US flight scheduled in that window the on-time rate is 70.1%, and DL 339 runs 13 points better at 83.0%. 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 339 next to SLC to BUR
Every carrier on SLC to BUR combined arrived on time 87.5% of the time across 1,457 flights, so DL 339 is 5 points behind it. Across its whole network Delta Air Lines managed 81.1%, which this flight beats by 2 points.
| Compared with | Flights | On time | Avg delay | Cancelled | Grade |
|---|---|---|---|---|---|
| DL 339thin sample | 313 | 83.0% | 58 min | 0.00% | B+ |
| All Delta Air Lines on SLC–BUR | 423 | 82.4% | 62 min | 0.00% | B+ |
| All carriers on SLC–BUR | 1,457 | 87.5% | 60 min | 0.41% | A+ |
| Delta Air Lines, whole network | 1,039,517 | 81.1% | 71 min | 1.74% | B |
Across the year
DL 339 quarter by quarter
DL 339 did not run the same all year. Its best quarter was Jul–Sep 2025 at 93.3% on time and its weakest Jul–Sep 2026 at 77.4%, a swing of 16 points on roughly 63 flights a quarter. The twelve-month rate averages over that, so if you are flying in a weak quarter the quarter's own figure is the better guide.
- Jul–Sep 202530 flights93.3%
- Oct–Dec 202569 flights82.4%
- Jan–Mar 202686 flights82.6%
- Apr–Jun 202666 flights84.8%
- Jul–Sep 202662 flights77.4%
Scale runs 70% to 100%.
By weekday, DL 339 did best on Saturday at 93.3% on time and worst on Thursday at 71.7%. Each day rests on about 45 flights, so a gap of 22 points is worth noticing but could still narrow in another year.
Arrival by arrival
How late DL 339 runs when it is late
The 53 late arrivals split 19 under half an hour, 17 between 30 and 60 minutes, and 17 an hour or more.
- 15+ min early64 flights20.5%
- Within 15 min195 flights62.5%
- 15–29 min late19 flights6.1%
- 30–59 min late17 flights5.4%
- 1–2 hours late15 flights4.8%
- 2+ hours late2 flights0.6%
Scale runs 0% to 100%.
Share of 312 completed flights by arrival against schedule.
19 of 67 late departures made up the time and arrived on time, 28% of them. Only 5 left on time and still arrived late.
The worst days
Worst days for DL 339
The latest arrival of the period was on 10 March 2026, 9 hours 51 minutes behind schedule; most of its delay minutes were filed as carrier-caused (crew, maintenance, fuelling, baggage). The same cause led on five of the five worst days.
| Date | Arrived late by | Largest filed cause |
|---|---|---|
| 10 March 2026 | 9 hours 51 minutes | Carrier |
| 12 August 2026 | 2 hours 37 minutes | Carrier |
| 9 November 2025 | 1 hour 58 minutes | Carrier |
| 31 March 2026 | 1 hour 37 minutes | Carrier |
| 7 April 2026 | 1 hour 27 minutes | Carrier |
Delay causes
Why DL 339 runs late
Carrier accounts for 71% of the 3,073 delay minutes carriers reported here, and the remaining four split what is left.
- 71%Carrier
- 22%Late-arriving aircraft
- 5%National Airspace System
- 2%Extreme weather
The largest share of delay minutes, 71%, falls under carrier control: crew scheduling, maintenance, fuelling, baggage. It accounts for 2,183 of the 3,073 delay minutes reported here. The split is drawn from 3,073 delay minutes reported on DL 339.
Cancellations are rare at 0.00%, below the national 1.89% 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
5.4% of arrivals land an hour or more late, close to the national 8.3%, so a 60 to 75 minute layover is reasonable here while anything under 45 minutes is a bet. Most delays on this route last about an hour, 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.
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. 313 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 83.0% on time with 0.00% cancelled over 313 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
- SkyWest Airlines 3693 on the same route92.5%
- Salt Lake City International (SLC) delay statistics
- Hollywood Burbank (BUR) 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.