Flight number record

DL 2121

Delta Air Lines · Minneapolis to San Diego

Route: MSP → SAN
Departs: 08:50
Flights: 341
Period: July 2025 to June 2026

Historical statistics for July 2025 to June 2026, not live status. For today’s DL 2121, check with Delta Air Lines.

DL 2121 lands a B+, 3 points better than the national rate of 77.6%. About one flight in five arrives 15 minutes late or worse, and those flights are late by about 40 minutes on average. That is a workable record, not a spotless one. That rests on 341 flights, with a median arrival 7 minutes early.

On time

80.8%

Arrivals under 15 minutes late, of 339 completed flights

Avg delay

41 min

Across delayed arrivals only, not all flights

Cancelled

0.59%

National rate is 1.81%

1 hour+ late

2.9%

National rate is 8.1%

These figures cover 341 flights between July 2025 and June 2026. The median arrival is 7 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 2121 flies

DL 2121 flies MSP to SAN without a single fixed slot. Its most common scheduled departure was 08:50, used on 92 of 341 flights, with 09:10 (66 flights) and 08:55 (58 flights) next. Carriers retime flights through the season, so the rates here blend slightly different positions in the aircraft's day.

Departs 08:5092 flights27.0%
Departs 09:1066 flights19.4%
Departs 08:5558 flights17.0%

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 08:50 departure sits in the 8am–11am window. Across every US flight scheduled in that window the on-time rate is 84.1%, and DL 2121 runs 3 points worse at 80.8%. Early departures usually start with an aircraft that has not flown yet that day, which is most of why the window does well.

Against the route

DL 2121 next to MSP to SAN

Every carrier on MSP to SAN combined arrived on time 77.5% of the time across 1,314 flights, so DL 2121 is 3 points ahead of it. Across its whole network Delta Air Lines managed 81.6%, close to this flight's figure.

DL 2121 against its route and carrier
Compared with	Flights	On time	Avg delay	Cancelled	Grade
DL 2121thin sample	341	80.8%	41 min	0.59%	B+
All Delta Air Lines on MSP–SAN	1,314	77.5%	48 min	0.76%	B+
All carriers on MSP–SAN	1,314	77.5%	48 min	0.76%	B+
Delta Air Lines, whole network	1,038,570	81.6%	71 min	1.62%	B

Across the year

DL 2121 quarter by quarter

Quarter by quarter DL 2121 held fairly steady: 81.5% in Jul–Sep 2025, 79.3% in Oct–Dec 2025, 78.5% in Jan–Mar 2026 and 83.3% in Apr–Jun 2026. A spread of 5 points is about what a sample of this size moves on its own, so the annual figure is a fair summary.

Jul–Sep 202592 flights81.5%
Oct–Dec 202592 flights79.3%
Jan–Mar 202666 flights78.5%
Apr–Jun 202691 flights83.3%

Scale runs 70% to 90%. Rows with fewer than 30 flights show a dash.

By weekday, DL 2121 did best on Tuesday at 86.0% on time and worst on Monday at 69.4%. Each day rests on about 49 flights, so a gap of 17 points is worth noticing but could still narrow in another year.

Delay causes

Why DL 2121 runs late

One category carries most of the weight here. National Airspace System accounts for 46% of the 2,650 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.

National Airspace System
46%
Carrier
43%
Extreme weather
8%
Late-arriving aircraft
3%

The largest share of delay minutes, 43%, 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 1,144 of the 2,650 delay minutes reported here. The split is drawn from 2,650 delay minutes reported on DL 2121.

Cancellations are rare at 0.59%, 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

Badly late arrivals are rare here: only 2.9% land an hour or more behind schedule, against 8.1% nationally. Connections built on this flight are about as safe as US domestic connections get, though a cancelled flight still ignores every layover you give it.

At 1,532 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 three other city pairs in the data, including SAN to MSP (55), MCI to ATL (24) and ATL to MCI (24), but none flew often enough under DL 2121 to report a rate for. Carriers move flight numbers between routes, so the figures on this page apply to MSP to SAN only.

One caution: this is a thin sample. 341 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 2121

For a booking, read DL 2121 as 80.8% on time with 0.59% cancelled over 341 flights. Those are rates from the past twelve months, not a forecast for any particular day.

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