Flight number record
DL 2640
Delta Air Lines · Los Angeles to Seattle
- Route
- LAX → SEA
- Departs
- 17:45
- Flights
- 361
- Period
- September 2025 to August 2026
Historical statistics for September 2025 to August 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 77.3%. Roughly one flight in five arrives 15 minutes late or worse, and those flights are late by about an hour on average. That rests on 361 flights, with a median arrival 12 minutes early.
Set against the rest of the country, DL 2640's record is 5 points better than the US average of 77.3%. That gap is worth roughly 45 fewer late arrivals for every thousand flights.
Key figures
On time
81.8%
Arrivals under 15 minutes late, of 358 completed flights
Avg delay
56 min
Across delayed arrivals only, not all flights
Cancelled
0.83%
National rate is 1.89%
1 hour+ late
6.1%
National rate is 8.3%
These figures cover 361 flights between September 2025 and August 2026. The median arrival is 12 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.
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Schedule
When DL 2640 flies
DL 2640 flies LAX to SEA without a single fixed slot. Its most common scheduled departure was 17:45, used on 57 of 361 flights, with 17:40 (55 flights) next.
- Departs 17:4557 flights15.8%
- Departs 17:4055 flights15.2%
Scale runs 0% to 100%.
Share of scheduled departures at each local time. Times used on fewer than one flight in ten are not listed.
A 17:45 departure sits in the 5pm–8pm window. Across every US flight scheduled in that window the on-time rate is 68.0%, and DL 2640 runs 14 points better at 81.8%. By that time of day most aircraft have flown several legs already, and whatever went wrong earlier is still in the schedule.
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Against the route
DL 2640 next to LAX to SEA
Every carrier on LAX to SEA combined arrived on time 85.0% of the time across 7,534 flights, so DL 2640 is 3 points behind it. Delta flew 2,228 flights on the same city pair under all its flight numbers, including this one, and those ran 85.2% on time. Across its whole network Delta Air Lines managed 81.1%, close to this flight's figure.
| Compared with | Flights | On time | Avg delay | Cancelled | Grade |
|---|---|---|---|---|---|
| DL 2640thin sample | 361 | 81.8% | 56 min | 0.83% | B+ |
| All Delta Air Lines on LAX–SEA | 2,228 | 85.2% | 71 min | 0.67% | A+ |
| All carriers on LAX–SEA | 7,534 | 85.0% | 62 min | 0.84% | A+ |
| Delta Air Lines, whole network | 1,039,517 | 81.1% | 71 min | 1.74% | B |
Across the year
DL 2640 quarter by quarter
DL 2640 did not run the same all year. Its best quarter was Jul–Sep 2025 at 90.0% on time and its weakest Jan–Mar 2026 at 75.9%, a swing of 14 points on roughly 72 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 202530 flights90.0%
- Oct–Dec 202589 flights88.6%
- Jan–Mar 202689 flights75.9%
- Apr–Jun 202691 flights78.0%
- Jul–Sep 202662 flights82.3%
Scale runs 65% to 95%.
By weekday, DL 2640 did best on Thursday at 92.0% on time and worst on Wednesday at 71.4%. Each day rests on about 52 flights, so a gap of 21 points is worth noticing but could still narrow in another year.
Arrival by arrival
How late DL 2640 runs when it is late
DL 2640 often beats the schedule: 160 of 358 completed flights, 45%, arrived 15 minutes or more early. The 65 late arrivals split 30 under half an hour, 13 between 30 and 60 minutes, and 22 an hour or more.
- 15+ min early160 flights44.7%
- Within 15 min133 flights37.2%
- 15–29 min late30 flights8.4%
- 30–59 min late13 flights3.6%
- 1–2 hours late16 flights4.5%
- 2+ hours late6 flights1.7%
Scale runs 0% to 100%.
Share of 358 completed flights by arrival against schedule.
25 of 86 late departures made up the time and arrived on time, 29% of them. Only 4 left on time and still arrived late.
The worst days
Worst days for DL 2640
The latest arrival of the period was on 30 December 2025, 4 hours 21 minutes behind schedule; most of its delay minutes were filed as carrier-caused (crew, maintenance, fuelling, baggage). The same cause led on four of the five worst days.
| Date | Arrived late by | Largest filed cause |
|---|---|---|
| 30 December 2025 | 4 hours 21 minutes | Carrier |
| 21 February 2026 | 4 hours 6 minutes | Carrier |
| 23 March 2026 | 3 hours 18 minutes | Late-arriving aircraft |
| 10 December 2025 | 2 hours 21 minutes | Carrier |
| 10 January 2026 | 2 hours 9 minutes | Carrier |
Delay causes
Why DL 2640 runs late
Carrier accounts for 62% of the 3,640 delay minutes carriers reported here, and the remaining four split what is left.
- 62%Carrier
- 33%Late-arriving aircraft
- 5%National Airspace System
The largest share of delay minutes, 62%, falls under carrier control: crew scheduling, maintenance, fuelling, baggage. It accounts for 2,247 of the 3,640 delay minutes reported here. The split is drawn from 3,640 delay minutes reported on DL 2640.
Cancellations are rare at 0.83%, below the national 1.89% 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 8.3%, so 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.
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 81.8% on time with 0.83% cancelled over 361 flights. Those are rates from the past twelve months, not a forecast for any particular day.
Related
Where to go next
- LAX to SEA, every carrier and departure
- SEA to LAX, the return direction
- Delta Air Lines 2606 on the same route83.1%
- Delta Air Lines 2980 on the same route92.2%
- Delta Air Lines 1714 on the same route91.7%
- Delta Air Lines 1045 on the same route86.9%
- Alaska Airlines 1305 on the same route73.3%
- Frontier Airlines 1177 on the same route83.6%
- Los Angeles International (LAX) delay statistics
- Seattle-Tacoma International (SEA) delay statistics
- Delta Air Lines on-time record
- Every Delta Air Lines flight number with a record
- The most and least reliable flight numbers in the US
- Why the first flight of the morning is statistically safest
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, September 2025 to August 2026. Last updated ; recomputed monthly. How this data is collected.