Flight number record

DL 2120

Delta Air Lines · Los Angeles to Las Vegas

Route: LAX → LAS
Departs: 15:00
Flights: 364
Period: July 2025 to June 2026

Historical statistics for July 2025 to June 2026, not live status. For today’s DL 2120, check with Delta Air Lines.

DL 2120 draws a C+. About one flight in three arrives at least 15 minutes late, and the typical late arrival is about an hour behind schedule. Build slack into anything you connect to. That rests on 364 flights, with a median arrival 1 minute early.

The national on-time rate over the same period is 77.6%, so DL 2120 runs 11 points behind the country as a whole. Across a thousand flights that is about 114 extra late arrivals.

On time

66.2%

Arrivals under 15 minutes late, of 361 completed flights

Avg delay

67 min

Across delayed arrivals only, not all flights

Cancelled

0.82%

National rate is 1.81%

1 hour+ late

13.3%

National rate is 8.1%

These figures cover 364 flights between July 2025 and June 2026. Beyond the headline rate, 13.3% of arrivals land a full hour or more behind schedule. That is the number that wrecks a connection, and it is not visible in an on-time percentage alone.

Schedule

When DL 2120 flies

DL 2120 flies LAX to LAS without a single fixed slot. Its most common scheduled departure was 15:00, used on 61 of 364 flights, with 15:05 (61 flights) and 15:02 (41 flights) next. Carriers retime flights through the season, so the rates here blend slightly different positions in the aircraft's day.

Departs 15:0061 flights16.8%
Departs 15:0561 flights16.8%
Departs 15:0241 flights11.3%

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 15:00 departure sits in the 2pm–5pm window. Across every US flight scheduled in that window the on-time rate is 72.4%, and DL 2120 runs 6 points worse at 66.2%. Midday slots inherit some of the morning's delays without yet carrying the full weight of the evening's.

Against the route

DL 2120 next to LAX to LAS

Every carrier on LAX to LAS combined arrived on time 76.5% of the time across 8,319 flights, so DL 2120 is 10 points behind it. Delta flew 1,735 flights on the same city pair under all its flight numbers, including this one, and those ran 78.5% on time. Across its whole network Delta Air Lines managed 81.6%, which this flight trails by 15 points.

DL 2120 against its route and carrier
Compared with	Flights	On time	Avg delay	Cancelled	Grade
DL 2120thin sample	364	66.2%	67 min	0.82%	C+
All Delta Air Lines on LAX–LAS	1,735	78.5%	59 min	0.81%	B+
All carriers on LAX–LAS	8,319	76.5%	64 min	0.77%	B+
Delta Air Lines, whole network	1,038,570	81.6%	71 min	1.62%	B

Across the year

DL 2120 quarter by quarter

DL 2120 did not run the same all year. Its best quarter was Jan–Mar 2026 at 75.6% on time and its weakest Jul–Sep 2025 at 58.2%, a swing of 17 points on roughly 91 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 202592 flights58.2%
Oct–Dec 202592 flights63.7%
Jan–Mar 202690 flights75.6%
Apr–Jun 202690 flights67.4%

Scale runs 50% to 80%. Rows with fewer than 30 flights show a dash.

By weekday, DL 2120 did best on Tuesday at 75.5% on time and worst on Thursday at 53.8%. Each day rests on about 52 flights, so a gap of 22 points is worth noticing but could still narrow in another year.

Delay causes

Why DL 2120 runs late

Carriers report a reason for every delay minute they cause, in five DOT categories. The split below is by minutes, not by number of flights, so a handful of very long weather delays weighs as much as many short ones. It covers 8,172 reported delay minutes.

Carrier
41%
Late-arriving aircraft
36%
National Airspace System
23%

36% of delay minutes trace back to a late-arriving aircraft, meaning the plane was already behind before it got here. That is a cascade, and cascades start small and grow through the day. Across 8,172 reported delay minutes here, that single category outweighs weather by 36 to one. It is the strongest argument for booking the first departure of the morning, when the aircraft has been sitting at the gate overnight with nothing to inherit. The split is drawn from 8,172 delay minutes reported on DL 2120.

Cancellations are rare at 0.82%, below the national 1.81% 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

For anyone connecting, the number to weigh is not the on-time rate but the tail behind it. 13.3% of arrivals land a full hour or more behind schedule, against 8.1% nationally. A 45-minute layover does not survive that, and no amount of walking quickly changes it. Ninety minutes is the honest minimum here, and two hours if the onward flight is on a separate ticket.

The same number turns up on one other city pair in the data, including LAS to LAX (126), but none flew often enough under DL 2120 to report a rate for. Carriers move flight numbers between routes, so the figures on this page apply to LAX to LAS only.

One caution: this is a thin sample. 364 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 2120

For a booking, DL 2120 is a flight to put a long connection behind. 13.3% of its completed flights arrived an hour or more late, which a short layover will not absorb. If the onward flight is on a separate ticket, the risk sits with you.

Where to go next

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.

Key figures