Flight number record

DL 2652

Delta Air Lines · Boston to San Antonio

Route: BOS → SAT
Departs: 09:15
Flights: 331
Period: July 2025 to June 2026

Historical statistics for July 2025 to June 2026, not live status. For today’s DL 2652, check with Delta Air Lines.

DL 2652 lands a B, 4 points better than the national rate of 77.6%. Roughly one flight in five arrives 15 minutes late or worse, and those flights are late by an hour and a half on average. That is a workable record, not a spotless one. That rests on 331 flights, with a median arrival 11 minutes early.

On time

81.5%

Arrivals under 15 minutes late, of 324 completed flights

Avg delay

83 min

Across delayed arrivals only, not all flights

Cancelled

1.81%

National rate is 1.81%

1 hour+ late

8.3%

National rate is 8.1%

These figures cover 331 flights between July 2025 and June 2026. Beyond the headline rate, 8.3% 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 2652 flies

DL 2652 flies BOS to SAT without a single fixed slot. Its most common scheduled departure was 09:15, used on 80 of 331 flights, with 09:20 (76 flights) and 11:46 (53 flights) next. Carriers retime flights through the season, so the rates here blend slightly different positions in the aircraft's day.

Departs 09:1580 flights24.2%
Departs 09:2076 flights23.0%
Departs 11:4653 flights16.0%

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 09:15 departure sits in the 8am–11am window. Across every US flight scheduled in that window the on-time rate is 84.1%, and DL 2652 runs 3 points worse at 81.5%. 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 2652 next to BOS to SAT

Every carrier on BOS to SAT combined arrived on time 80.1% of the time across 355 flights, so DL 2652 is about level with it. Across its whole network Delta Air Lines managed 81.6%, close to this flight's figure.

DL 2652 against its route and carrier
Compared with	Flights	On time	Avg delay	Cancelled	Grade
DL 2652thin sample	331	81.5%	83 min	1.81%	B
All Delta Air Lines on BOS–SATthin sample	355	80.1%	80 min	2.25%	B
All carriers on BOS–SATthin sample	355	80.1%	80 min	2.25%	B
Delta Air Lines, whole network	1,038,570	81.6%	71 min	1.62%	B

Across the year

DL 2652 quarter by quarter

DL 2652 did not run the same all year. Its best quarter was Jul–Sep 2025 at 87.6% on time and its weakest Oct–Dec 2025 at 73.8%, a swing of 14 points on roughly 83 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 202590 flights87.6%
Oct–Dec 202586 flights73.8%
Jan–Mar 202688 flights82.6%
Apr–Jun 202667 flights81.5%

Scale runs 65% to 95%. Rows with fewer than 30 flights show a dash.

By weekday, DL 2652 did best on Monday at 88.6% on time and worst on Sunday at 71.7%. Each day rests on about 47 flights, so a gap of 17 points is worth noticing but could still narrow in another year.

Delay causes

Why DL 2652 runs late

One category carries most of the weight here. Carrier accounts for 55% of the 4,964 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.

Carrier
55%
Late-arriving aircraft
32%
National Airspace System
12%
Extreme weather
1%

The largest share of delay minutes, 55%, 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 2,749 of the 4,964 delay minutes reported here. The split is drawn from 4,964 delay minutes reported on DL 2652.

Cancellations sit at 1.81% against a national 1.81%, which is ordinary. Diversions add another 0.30%.

Connections and routes

What a delay on this flight costs

8.3% of arrivals land an hour or more late, close to the national 8.1%. That is the figure that decides a connection, and it says a 60 to 75 minute layover is reasonable here while anything under 45 minutes is a bet. Most delays on this route last an hour and a half, which a normal layover absorbs.

At 1,764 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 SFO to SLC (18) and SAT to BOS (11), but none flew often enough under DL 2652 to report a rate for. Carriers move flight numbers between routes, so the figures on this page apply to BOS to SAT only.

One caution: this is a thin sample. 331 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 2652

For a booking, read DL 2652 as 81.5% on time with 1.81% cancelled over 331 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