Flight number record
DL 774
Delta Air Lines · Atlanta to Seattle
- Route
- ATL → SEA
- Departs
- 09:40
- Flights
- 365
- Period
- September 2025 to August 2026
Historical statistics for September 2025 to August 2026, not live status. For today’s DL 774, check with Delta Air Lines.
DL 774 earns a B+. More than four flights in five arrive inside the 15-minute window the DOT uses to define an on-time arrival, which puts it 7 points better than the national rate of 77.3%. When something does go wrong the average delay runs roughly 50 minutes. That rests on 365 flights, with a median arrival 7 minutes early.
Set against the rest of the country, DL 774's record is 7 points better than the US average of 77.3%. That gap is worth roughly 73 fewer late arrivals for every thousand flights.
Key figures
On time
84.6%
Arrivals under 15 minutes late, of 363 completed flights
Avg delay
52 min
Across delayed arrivals only, not all flights
Cancelled
0.00%
National rate is 1.89%
1 hour+ late
3.0%
National rate is 8.3%
These figures cover 365 flights between September 2025 and August 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.
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Schedule
When DL 774 flies
DL 774 flies ATL to SEA without a single fixed slot. Its most common scheduled departure was 09:40, used on 140 of 365 flights, with 09:55 (64 flights) and 09:59 (41 flights) next.
- Departs 09:40140 flights38.4%
- Departs 09:5564 flights17.5%
- Departs 09:5941 flights11.2%
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 09:40 departure sits in the 8am–11am window. Across every US flight scheduled in that window the on-time rate is 83.9%, and DL 774 runs level with that at 84.6%. Early departures usually start with an aircraft that has not flown yet that day, which is most of why the window does well.
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Against the route
DL 774 next to ATL to SEA
Every carrier on ATL to SEA combined arrived on time 76.7% of the time across 3,297 flights, so DL 774 is 8 points ahead of it. Delta flew 2,404 flights on the same city pair under all its flight numbers, including this one, and those ran 76.8% on time. Across its whole network Delta Air Lines managed 81.1%, which this flight beats by 4 points.
| Compared with | Flights | On time | Avg delay | Cancelled | Grade |
|---|---|---|---|---|---|
| DL 774 | 365 | 84.6% | 52 min | 0.00% | B+ |
| All Delta Air Lines on ATL–SEA | 2,404 | 76.8% | 58 min | 0.62% | B+ |
| All carriers on ATL–SEA | 3,297 | 76.7% | 57 min | 0.73% | B+ |
| Delta Air Lines, whole network | 1,039,517 | 81.1% | 71 min | 1.74% | B |
Across the year
DL 774 quarter by quarter
DL 774 did not run the same all year. Its best quarter was Apr–Jun 2026 at 91.2% on time and its weakest Jan–Mar 2026 at 75.3%, a swing of 16 points on roughly 73 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 202592 flights85.7%
- Jan–Mar 202690 flights75.3%
- Apr–Jun 202691 flights91.2%
- Jul–Sep 202662 flights83.9%
Scale runs 65% to 95%.
By weekday, DL 774 did best on Friday at 90.2% on time and worst on Monday at 77.4%. Each day rests on about 52 flights, so a gap of 13 points is worth noticing but could still narrow in another year.
Arrival by arrival
How late DL 774 runs when it is late
DL 774 often beats the schedule: 107 of 363 completed flights, 29%, arrived 15 minutes or more early. The 56 late arrivals split 27 under half an hour, 18 between 30 and 60 minutes, and 11 an hour or more.
- 15+ min early107 flights29.5%
- Within 15 min200 flights55.1%
- 15–29 min late27 flights7.4%
- 30–59 min late18 flights5.0%
- 1–2 hours late6 flights1.7%
- 2+ hours late5 flights1.4%
Scale runs 0% to 100%.
Share of 363 completed flights by arrival against schedule.
10 of 44 late departures made up the time and arrived on time, 23% of them. In the other direction, 22 flights left on time yet arrived 15 minutes late or more, so that delay built up after pushback: in the air, in a holding pattern or on the ground at SEA.
The worst days
Worst days for DL 774
The latest arrival of the period was on 31 December 2025, 6 hours 49 minutes behind schedule; most of its delay minutes were filed as carrier-caused (crew, maintenance, fuelling, baggage). The same cause led on five of the five worst days.
| Date | Arrived late by | Largest filed cause |
|---|---|---|
| 31 December 2025 | 6 hours 49 minutes | Carrier |
| 7 December 2025 | 4 hours 24 minutes | Carrier |
| 4 October 2025 | 2 hours 23 minutes | Carrier |
| 16 March 2026 | 2 hours 16 minutes | Carrier |
| 26 September 2025 | 2 hours 10 minutes | Carrier |
Delay causes
Why DL 774 runs late
Carrier accounts for 71% of the 2,936 delay minutes carriers reported here, and the remaining four split what is left.
- 71%Carrier
- 28%National Airspace System
- 2%Late-arriving aircraft
The largest share of delay minutes, 71%, falls under carrier control: crew scheduling, maintenance, fuelling, baggage. It accounts for 2,076 of the 2,936 delay minutes reported here. The split is drawn from 2,936 delay minutes reported on DL 774.
Cancellations are rare at 0.00%, below the national 1.89% and low enough to earn the plus on the grade. Almost no flights are 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 3.0% land an hour or more behind schedule, against 8.3% 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 2,182 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.
Every one of the 365 flights under DL 774 in the data flew ATL 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. 365 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 774
For a booking, read DL 774 as 84.6% on time with 0.00% cancelled over 365 flights. Those are rates from the past twelve months, not a forecast for any particular day.
Related
Where to go next
- ATL to SEA, every carrier and departure
- SEA to ATL, the return direction
- Delta Air Lines 629 on the same route80.4%
- Delta Air Lines 444 on the same route78.3%
- Delta Air Lines 481 on the same route78.4%
- Delta Air Lines 714 on the same route65.0%
- Alaska Airlines 377 on the same route85.3%
- Delta Air Lines 903 on the same route77.7%
- Hartsfield-Jackson Atlanta International (ATL) 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
- Worst months to fly in the US, ranked by the data
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.