Flight number record

DL 804

Delta Air Lines · Dallas-Fort Worth to Seattle

Route: DFW → SEA
Departs: 06:30
Flights: 365
Period: September 2025 to August 2026

Historical statistics for September 2025 to August 2026, not live status. For today’s DL 804, check with Delta Air Lines.

DL 804 earns an A. More than four flights in five arrive inside the 15-minute window the DOT uses to define an on-time arrival, which puts it 8 points better than the national rate of 77.3%. When something does go wrong the average delay runs a little over an hour. That rests on 365 flights, with a median arrival 7 minutes early.

Set against the rest of the country, DL 804's record is 8 points better than the US average of 77.3%. That gap is worth roughly 77 fewer late arrivals for every thousand flights.

On time

85.0%

Arrivals under 15 minutes late, of 354 completed flights

Avg delay

73 min

Across delayed arrivals only, not all flights

Cancelled

2.47%

National rate is 1.89%

1 hour+ late

3.7%

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 804 flies

DL 804 flies DFW to SEA without a single fixed slot. Its most common scheduled departure was 06:30, used on 111 of 365 flights, with 06:20 (90 flights) and 07:10 (75 flights) next.

Departs 06:30111 flights30.4%
Departs 06:2090 flights24.7%
Departs 07:1075 flights20.5%

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 06:30 departure sits in the 5am–8am window. Across every US flight scheduled in that window the on-time rate is 89.3%, and DL 804 runs 4 points worse at 85.0%. 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 804 next to DFW to SEA

Every carrier on DFW to SEA combined arrived on time 71.1% of the time across 5,227 flights, so DL 804 is 14 points ahead of it. Delta flew 720 flights on the same city pair under all its flight numbers, including this one, and those ran 79.3% on time. Across its whole network Delta Air Lines managed 81.1%, which this flight beats by 4 points.

DL 804 against its route and carrier
Compared with	Flights	On time	Avg delay	Cancelled	Grade
DL 804	365	85.0%	73 min	2.47%	A
All Delta Air Lines on DFW–SEA	720	79.3%	89 min	1.67%	B
All carriers on DFW–SEA	5,227	71.1%	62 min	1.78%	C
Delta Air Lines, whole network	1,039,517	81.1%	71 min	1.74%	B

Across the year

DL 804 quarter by quarter

DL 804 did not run the same all year. Its best quarter was Jul–Sep 2026 at 93.4% on time and its weakest Jan–Mar 2026 at 81.9%, a swing of 12 points on roughly 91 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 flights—
Oct–Dec 202592 flights84.4%
Jan–Mar 202690 flights81.9%
Apr–Jun 202691 flights83.5%
Jul–Sep 202662 flights93.4%

Scale runs 75% to 100%. Rows with fewer than 30 flights show a dash.

By weekday, DL 804 ranged from 82.4% on Wednesday to 88.2% on Thursday. With about 52 flights behind each day, a spread of 6 points is inside normal variation, so the day you fly is not worth changing for this flight.

Arrival by arrival

How late DL 804 runs when it is late

DL 804 often beats the schedule: 101 of 354 completed flights, 29%, arrived 15 minutes or more early. Most of the lateness is short. 27 of the 53 late arrivals were under half an hour behind, and 13 reached an hour or more.

15+ min early101 flights28.5%
Within 15 min200 flights56.5%
15–29 min late27 flights7.6%
30–59 min late13 flights3.7%
1–2 hours late4 flights1.1%
2+ hours late9 flights2.5%

Scale runs 0% to 100%.

Share of 354 completed flights by arrival against schedule.

Time lost at the gate mostly stays lost. Of 27 departures that left 15 minutes late or more, only 2 made it up before arrival. In the other direction, 28 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 804

The latest arrival of the period was on 3 April 2026, 10 hours 36 minutes behind schedule; most of its delay minutes were filed as a late-arriving aircraft. On three of the five worst days the largest share was filed as carrier-caused (crew, maintenance, fuelling, baggage).

The latest arrivals of DL 804 in the period
Date	Arrived late by	Largest filed cause
3 April 2026	10 hours 36 minutes	Late-arriving aircraft
19 August 2026	6 hours 44 minutes	Carrier
3 December 2025	4 hours 18 minutes	Carrier
11 May 2026	4 hours 15 minutes	Carrier
19 June 2026	3 hours 14 minutes	Extreme weather

Delay causes

Why DL 804 runs late

Carriers report a reason for every delay minute they cause, in five DOT categories. The split below is by minutes, not by number of flights, so a handful of very long weather delays weighs as much as many short ones. It covers 3,862 reported delay minutes.

Carrier
42%
National Airspace System
25%
Extreme weather
17%
Late-arriving aircraft
16%

Extreme weather accounts for 17% of delay minutes, well above the single-digit share typical across the system. Weather delays are lumpy: they arrive as whole bad days rather than as a steady drag, so the quarterly figures above are the more useful view of the risk. The national share is 6%, so this operation carries roughly 2.8 times the usual weather exposure. The split is drawn from 3,862 delay minutes reported on DL 804.

Cancellations sit at 2.47% against a national 1.89%, which is ordinary. Diversions add another 0.55%.

Connections and routes

What a delay on this flight costs

Badly late arrivals are rare here: only 3.7% 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 1,660 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 804 in the data flew DFW 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 804

For a booking, read DL 804 as 85.0% on time with 2.47% cancelled over 365 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, September 2025 to August 2026. Last updated 22 October 2026; recomputed monthly. How this data is collected.

Key figures