Flight number record
DL 2949
Delta Air Lines · Seattle to Las Vegas
- Route
- SEA → LAS
- Departs
- 20:20
- Flights
- 358
- Period
- September 2025 to August 2026
Historical statistics for September 2025 to August 2026, not live status. For today’s DL 2949, check with Delta Air Lines.
DL 2949 lands a B+, 2 points better than the national rate of 77.3%. About one flight in five arrives 15 minutes late or worse, and those flights are late by about 50 minutes on average. That rests on 358 flights, with a median arrival 6 minutes early.
Key figures
On time
78.9%
Arrivals under 15 minutes late, of 355 completed flights
Avg delay
50 min
Across delayed arrivals only, not all flights
Cancelled
0.84%
National rate is 1.89%
1 hour+ late
5.6%
National rate is 8.3%
These figures cover 358 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.
Fare search by Aviasales, a Travelpayouts partner. Booking through it may earn this site a commission at no cost to you; it changes no figure here.
Schedule
When DL 2949 flies
DL 2949 flies SEA to LAS without a single fixed slot. Its most common scheduled departure was 20:20, used on 80 of 358 flights, with 19:59 (71 flights) next.
- Departs 20:2080 flights22.3%
- Departs 19:5971 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 20:20 departure sits in the 8pm–5am window. Across every US flight scheduled in that window the on-time rate is 70.1%, and DL 2949 runs 9 points better at 78.9%. By that time of day most aircraft have flown several legs already, and whatever went wrong earlier is still in the schedule.
Timetable by Aviasales, a Travelpayouts partner. Booking through it may earn this site a commission at no cost to you; it changes no figure here.
Against the route
DL 2949 next to SEA to LAS
Every carrier on SEA to LAS combined arrived on time 77.6% of the time across 5,620 flights, so DL 2949 is about level with it. Delta flew 1,748 flights on the same city pair under all its flight numbers, including this one, and those ran 81.3% on time. Across its whole network Delta Air Lines managed 81.1%, which this flight trails by 2 points.
| Compared with | Flights | On time | Avg delay | Cancelled | Grade |
|---|---|---|---|---|---|
| DL 2949thin sample | 358 | 78.9% | 50 min | 0.84% | B+ |
| All Delta Air Lines on SEA–LAS | 1,748 | 81.3% | 54 min | 1.09% | B |
| All carriers on SEA–LAS | 5,620 | 77.6% | 56 min | 0.93% | B+ |
| Delta Air Lines, whole network | 1,039,517 | 81.1% | 71 min | 1.74% | B |
Across the year
DL 2949 quarter by quarter
DL 2949 did not run the same all year. Its best quarter was Oct–Dec 2025 at 85.2% on time and its weakest Jul–Sep 2026 at 71.2%, a swing of 14 points on roughly 72 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 flights76.7%
- Oct–Dec 202588 flights85.2%
- Jan–Mar 202689 flights77.3%
- Apr–Jun 202690 flights80.0%
- Jul–Sep 202661 flights71.2%
Scale runs 65% to 90%.
By weekday, DL 2949 did best on Tuesday at 86.3% on time and worst on Thursday at 70.8%. Each day rests on about 51 flights, so a gap of 16 points is worth noticing but could still narrow in another year.
Arrival by arrival
How late DL 2949 runs when it is late
DL 2949 often beats the schedule: 99 of 355 completed flights, 28%, arrived 15 minutes or more early. The 75 late arrivals split 33 under half an hour, 22 between 30 and 60 minutes, and 20 an hour or more.
- 15+ min early99 flights27.9%
- Within 15 min181 flights51.0%
- 15–29 min late33 flights9.3%
- 30–59 min late22 flights6.2%
- 1–2 hours late14 flights3.9%
- 2+ hours late6 flights1.7%
Scale runs 0% to 100%.
Share of 355 completed flights by arrival against schedule.
7 of 58 late departures made up the time and arrived on time, 12% 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 2949
The latest arrival of the period was on 11 October 2025, 3 hours 47 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 |
|---|---|---|
| 11 October 2025 | 3 hours 47 minutes | Carrier |
| 25 February 2026 | 2 hours 38 minutes | Carrier |
| 2 October 2025 | 2 hours 29 minutes | Carrier |
| 19 May 2026 | 2 hours 19 minutes | Carrier |
| 7 August 2026 | 2 hours 12 minutes | Late-arriving aircraft |
Delay causes
Why DL 2949 runs late
Carrier accounts for 55% of the 3,770 delay minutes carriers reported here, and the remaining four split what is left.
- 55%Carrier
- 28%National Airspace System
- 15%Late-arriving aircraft
- 1%Security
The largest share of delay minutes, 55%, falls under carrier control: crew scheduling, maintenance, fuelling, baggage. It accounts for 2,080 of the 3,770 delay minutes reported here. The split is drawn from 3,770 delay minutes reported on DL 2949.
Cancellations are rare at 0.84%, 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
5.6% 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 50 minutes, which a normal layover absorbs.
The 867 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 358 flights under DL 2949 in the data flew SEA to LAS. 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. 358 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 2949
For a booking, read DL 2949 as 78.9% on time with 0.84% cancelled over 358 flights. Those are rates from the past twelve months, not a forecast for any particular day.
Related
Where to go next
- SEA to LAS, every carrier and departure
- LAS to SEA, the return direction
- Delta Air Lines 2922 on the same route91.1%
- Delta Air Lines 2905 on the same route82.9%
- Delta Air Lines 2880 on the same route80.1%
- Alaska Airlines 738 on the same route78.3%
- Alaska Airlines 478 on the same route73.3%
- Alaska Airlines 704 on the same route84.2%
- Seattle-Tacoma International (SEA) 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.