Flight number record
DL 549
Delta Air Lines · Atlanta to Las Vegas
- Route
- ATL → LAS
- Departs
- 12:15
- Flights
- 347
- Period
- September 2025 to August 2026
Historical statistics for September 2025 to August 2026, not live status. For today’s DL 549, check with Delta Air Lines.
DL 549 lands a B+, level with the national rate of 77.3%. Roughly one flight in four arrives 15 minutes late or worse, and those flights are late by about 55 minutes on average. That rests on 347 flights, with a median arrival 3 minutes early.
Key figures
On time
76.9%
Arrivals under 15 minutes late, of 346 completed flights
Avg delay
55 min
Across delayed arrivals only, not all flights
Cancelled
0.29%
National rate is 1.89%
1 hour+ late
7.5%
National rate is 8.3%
These figures cover 347 flights between September 2025 and August 2026. The median arrival is 3 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 549 flies
DL 549 flies ATL to LAS without a single fixed slot. Its most common scheduled departure was 12:15, used on 53 of 347 flights, with 13:15 (44 flights) and 12:20 (36 flights) next.
- Departs 12:1553 flights15.3%
- Departs 13:1544 flights12.7%
- Departs 12:2036 flights10.4%
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 12:15 departure sits in the 11am–2pm window. Across every US flight scheduled in that window the on-time rate is 78.3%, and DL 549 runs level with that at 76.9%. Midday slots inherit some of the morning's delays without yet carrying the full weight of the evening's.
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Against the route
DL 549 next to ATL to LAS
Every carrier on ATL to LAS combined arrived on time 74.8% of the time across 4,758 flights, so DL 549 is 2 points ahead of it. Delta flew 3,324 flights on the same city pair under all its flight numbers, including this one, and those ran 76.5% on time. Across its whole network Delta Air Lines managed 81.1%, which this flight trails by 4 points.
| Compared with | Flights | On time | Avg delay | Cancelled | Grade |
|---|---|---|---|---|---|
| DL 549thin sample | 347 | 76.9% | 55 min | 0.29% | B+ |
| All Delta Air Lines on ATL–LAS | 3,324 | 76.5% | 57 min | 0.66% | B+ |
| All carriers on ATL–LAS | 4,758 | 74.8% | 63 min | 0.78% | C+ |
| Delta Air Lines, whole network | 1,039,517 | 81.1% | 71 min | 1.74% | B |
Across the year
DL 549 quarter by quarter
DL 549 did not run the same all year. Its best quarter was Jul–Sep 2025 at 86.7% on time and its weakest Jul–Sep 2026 at 63.9%, a swing of 23 points on roughly 69 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 flights86.7%
- Oct–Dec 202579 flights86.1%
- Jan–Mar 202686 flights74.1%
- Apr–Jun 202691 flights76.9%
- Jul–Sep 202661 flights63.9%
Scale runs 55% to 90%.
By weekday, DL 549 did best on Wednesday at 90.0% on time and worst on Friday at 69.4%. Each day rests on about 50 flights, so a gap of 21 points is worth noticing but could still narrow in another year.
Arrival by arrival
How late DL 549 runs when it is late
The 80 late arrivals split 30 under half an hour, 24 between 30 and 60 minutes, and 26 an hour or more.
- 15+ min early76 flights22.0%
- Within 15 min190 flights54.9%
- 15–29 min late30 flights8.7%
- 30–59 min late24 flights6.9%
- 1–2 hours late18 flights5.2%
- 2+ hours late8 flights2.3%
Scale runs 0% to 100%.
Share of 346 completed flights by arrival against schedule.
13 of 69 late departures made up the time and arrived on time, 19% of them. In the other direction, 24 flights left on time yet arrived 15 minutes late or more, so that delay built up after pushback: in the air, in a holding pattern or on the ground at LAS.
The worst days
Worst days for DL 549
The latest arrival of the period was on 7 December 2025, 3 hours 45 minutes behind schedule; most of its delay minutes were filed as a late-arriving aircraft. The same cause led on three of the five worst days.
| Date | Arrived late by | Largest filed cause |
|---|---|---|
| 7 December 2025 | 3 hours 45 minutes | Late-arriving aircraft |
| 5 June 2026 | 3 hours 43 minutes | Carrier |
| 28 April 2026 | 3 hours 25 minutes | Late-arriving aircraft |
| 17 March 2026 | 2 hours 49 minutes | Late-arriving aircraft |
| 25 October 2025 | 2 hours 48 minutes | Carrier |
Delay causes
Why DL 549 runs late
Carrier accounts for 50% of the 4,388 delay minutes carriers reported here, and the remaining four split what is left.
- 50%Carrier
- 26%National Airspace System
- 21%Late-arriving aircraft
- 3%Extreme weather
The largest share of delay minutes, 50%, falls under carrier control: crew scheduling, maintenance, fuelling, baggage. It accounts for 2,209 of the 4,388 delay minutes reported here. The split is drawn from 4,388 delay minutes reported on DL 549.
Cancellations are rare at 0.29%, 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
7.5% 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 55 minutes, which a normal layover absorbs.
At 1,747 miles this is transcontinental flying, and long routes get a quiet structural advantage. Scheduled block time on a flight this length carries more padding in absolute minutes, so a twenty-minute late departure often still becomes an on-time arrival. Read the on-time rate here as slightly flattering next to a short-haul route with the same operational quality.
The same number turns up on two other city pairs in the data, including LAS to ATL (36) and ATL to SJC (15), but none flew often enough under DL 549 to report a rate for. Carriers move flight numbers between routes, so the figures on this page apply to ATL to LAS only.
One caution: this is a thin sample. 347 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 549
For a booking, read DL 549 as 76.9% on time with 0.29% cancelled over 347 flights. Those are rates from the past twelve months, not a forecast for any particular day.
Related
Where to go next
- ATL to LAS, every carrier and departure
- LAS to ATL, the return direction
- Delta Air Lines 711 on the same route77.4%
- Delta Air Lines 777 on the same route85.5%
- Delta Air Lines 659 on the same route77.6%
- Delta Air Lines 466 on the same route79.3%
- Frontier Airlines 3923 on the same route57.0%
- Delta Air Lines 919 on the same route74.7%
- Hartsfield-Jackson Atlanta International (ATL) delay statistics
- Harry Reid International (LAS) 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.