Flight number record

DL 2648

Delta Air Lines · Detroit to Boston

Route: DTW → BOS
Departs: 10:00
Flights: 364
Period: July 2025 to June 2026

Historical statistics for July 2025 to June 2026, not live status. For today’s DL 2648, check with Delta Air Lines.

DL 2648 lands a B, 4 points better than the national rate of 77.6%. About one flight in six arrives 15 minutes late or worse, and those flights are late by about an hour on average. That is a workable record, not a spotless one. That rests on 364 flights, with a median arrival 8 minutes early.

Set against the rest of the country, DL 2648's record is 4 points better than the US average of 77.6%. That gap is worth roughly 43 fewer late arrivals for every thousand flights.

On time

81.9%

Arrivals under 15 minutes late, of 359 completed flights

Avg delay

60 min

Across delayed arrivals only, not all flights

Cancelled

1.37%

National rate is 1.81%

1 hour+ late

8.4%

National rate is 8.1%

These figures cover 364 flights between July 2025 and June 2026. Beyond the headline rate, 8.4% 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 2648 flies

DL 2648 flies DTW to BOS without a single fixed slot. Its most common scheduled departure was 10:00, used on 119 of 364 flights, with 10:05 (117 flights) and 10:10 (41 flights) next. Carriers retime flights through the season, so the rates here blend slightly different positions in the aircraft's day.

Departs 10:00119 flights32.7%
Departs 10:05117 flights32.1%
Departs 10:1041 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 10:00 departure sits in the 8am–11am window. Across every US flight scheduled in that window the on-time rate is 84.1%, and DL 2648 runs 2 points worse at 81.9%. 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 2648 next to DTW to BOS

Every carrier on DTW to BOS combined arrived on time 74.8% of the time across 2,588 flights, so DL 2648 is 7 points ahead of it. Delta flew 1,710 flights on the same city pair under all its flight numbers, including this one, and those ran 74.9% on time. Across its whole network Delta Air Lines managed 81.6%, close to this flight's figure.

DL 2648 against its route and carrier
Compared with	Flights	On time	Avg delay	Cancelled	Grade
DL 2648thin sample	364	81.9%	60 min	1.37%	B
All Delta Air Lines on DTW–BOS	1,710	74.9%	67 min	1.81%	C
All carriers on DTW–BOS	2,588	74.8%	72 min	2.09%	C
Delta Air Lines, whole network	1,038,570	81.6%	71 min	1.62%	B

Across the year

DL 2648 quarter by quarter

Quarter by quarter DL 2648 held fairly steady: 81.3% in Jul–Sep 2025, 80.2% in Oct–Dec 2025, 82.8% in Jan–Mar 2026 and 83.3% in Apr–Jun 2026. A spread of 3 points is about what a sample of this size moves on its own, so the annual figure is a fair summary.

Jul–Sep 202592 flights81.3%
Oct–Dec 202591 flights80.2%
Jan–Mar 202690 flights82.8%
Apr–Jun 202691 flights83.3%

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

By weekday, DL 2648 did best on Tuesday at 88.5% on time and worst on Monday at 70.6%. Each day rests on about 52 flights, so a gap of 18 points is worth noticing but could still narrow in another year.

Delay causes

Why DL 2648 runs late

One category carries most of the weight here. Carrier accounts for 68% of the 3,885 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
68%
National Airspace System
25%
Extreme weather
3%
Late-arriving aircraft
3%

The largest share of delay minutes, 68%, 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 2,659 of the 3,885 delay minutes reported here. The split is drawn from 3,885 delay minutes reported on DL 2648.

Cancellations sit at 1.37% against a national 1.81%, which is ordinary. Diversions add another 0.00%.

Connections and routes

What a delay on this flight costs

8.4% 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 about an hour, which a normal layover absorbs.

The 632 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. It is also long enough that the aircraft usually flies three or four legs a day rather than six, which slows how fast delay compounds.

Every one of the 364 flights under DL 2648 in the data flew DTW to BOS. 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. 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 2648

For a booking, read DL 2648 as 81.9% on time with 1.37% cancelled over 364 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