Flight number record

DL 2640

Delta Air Lines · Los Angeles to Seattle

Route: LAX → SEA
Departs: 17:40
Flights: 361
Period: July 2025 to June 2026

Historical statistics for July 2025 to June 2026, not live status. For today’s DL 2640, check with Delta Air Lines.

DL 2640 lands a B+, 5 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 361 flights, with a median arrival 13 minutes early.

Set against the rest of the country, DL 2640's record is 5 points better than the US average of 77.6%. That gap is worth roughly 48 fewer late arrivals for every thousand flights.

On time

82.4%

Arrivals under 15 minutes late, of 358 completed flights

Avg delay

63 min

Across delayed arrivals only, not all flights

Cancelled

0.83%

National rate is 1.81%

1 hour+ late

6.1%

National rate is 8.1%

These figures cover 361 flights between July 2025 and June 2026. The median arrival is 13 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 2640 flies

DL 2640 flies LAX to SEA without a single fixed slot. Its most common scheduled departure was 17:40, used on 55 of 361 flights, with 17:25 (48 flights) and 17:43 (41 flights) next. Carriers retime flights through the season, so the rates here blend slightly different positions in the aircraft's day.

Departs 17:4055 flights15.2%
Departs 17:2548 flights13.3%
Departs 17:4341 flights11.4%

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 17:40 departure sits in the 5pm–8pm window. Across every US flight scheduled in that window the on-time rate is 68.2%, and DL 2640 runs 14 points better at 82.4%. By that time of day most aircraft have flown several legs already, and whatever went wrong earlier is still in the schedule.

Against the route

DL 2640 next to LAX to SEA

Every carrier on LAX to SEA combined arrived on time 85.4% of the time across 7,424 flights, so DL 2640 is 3 points behind it. Delta flew 2,224 flights on the same city pair under all its flight numbers, including this one, and those ran 86.8% on time. Across its whole network Delta Air Lines managed 81.6%, close to this flight's figure.

DL 2640 against its route and carrier
Compared with	Flights	On time	Avg delay	Cancelled	Grade
DL 2640thin sample	361	82.4%	63 min	0.83%	B+
All Delta Air Lines on LAX–SEA	2,224	86.8%	76 min	0.76%	A+
All carriers on LAX–SEA	7,424	85.4%	64 min	0.98%	A+
Delta Air Lines, whole network	1,038,570	81.6%	71 min	1.62%	B

Across the year

DL 2640 quarter by quarter

DL 2640 did not run the same all year. Its best quarter was Oct–Dec 2025 at 88.6% on time and its weakest Jan–Mar 2026 at 75.9%, a swing of 13 points on roughly 90 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 flights87.0%
Oct–Dec 202589 flights88.6%
Jan–Mar 202689 flights75.9%
Apr–Jun 202691 flights78.0%

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

By weekday, DL 2640 did best on Thursday at 92.0% on time and worst on Sunday at 72.5%. Each day rests on about 52 flights, so a gap of 20 points is worth noticing but could still narrow in another year.

Delay causes

Why DL 2640 runs late

One category carries most of the weight here. Carrier accounts for 59% of the 3,941 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
59%
Late-arriving aircraft
38%
National Airspace System
3%

38% 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 3,941 reported delay minutes here, that single category outweighs weather by 38 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 3,941 delay minutes reported on DL 2640.

Cancellations are rare at 0.83%, 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

6.1% 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 954 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 361 flights under DL 2640 in the data flew LAX to SEA. 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. 361 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 2640

For a booking, read DL 2640 as 82.4% on time with 0.83% cancelled over 361 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