Flight number record

DL 1412

Delta Air Lines · Seattle to San Francisco

Route: SEA → SFO
Departs: 10:25
Flights: 346
Period: September 2025 to August 2026

Historical statistics for September 2025 to August 2026, not live status. For today’s DL 1412, check with Delta Air Lines.

DL 1412 draws a D. Roughly one flight in three arrives at least 15 minutes late, and the typical late arrival is about an hour behind schedule. Build slack into anything you connect to. That rests on 346 flights, with a median arrival 8 minutes late.

The national on-time rate over the same period is 77.3%, so DL 1412 runs 17 points behind the country as a whole. Across a thousand flights that is about 172 extra late arrivals.

On time

60.1%

Arrivals under 15 minutes late, of 341 completed flights

Avg delay

56 min

Across delayed arrivals only, not all flights

Cancelled

1.45%

National rate is 1.89%

1 hour+ late

12.3%

National rate is 8.3%

These figures cover 346 flights between September 2025 and August 2026. Beyond the headline rate, 12.3% of arrivals land a full hour or more behind schedule, against 8.3% nationally.

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Schedule

When DL 1412 flies

DL 1412 flies SEA to SFO without a single fixed slot. Its most common scheduled departure was 10:25, used on 68 of 346 flights, with 09:45 (57 flights) and 11:45 (57 flights) next.

Departs 10:2568 flights19.7%
Departs 09:4557 flights16.5%
Departs 11:4557 flights16.5%

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 10:25 departure sits in the 8am–11am window. Across every US flight scheduled in that window the on-time rate is 83.9%, and DL 1412 runs 24 points worse at 60.1%. 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 1412 next to SEA to SFO

Every carrier on SEA to SFO combined arrived on time 59.8% of the time across 6,817 flights, so DL 1412 is about level with it. Delta flew 985 flights on the same city pair under all its flight numbers, including this one, and those ran 60.5% on time. Across its whole network Delta Air Lines managed 81.1%, which this flight trails by 21 points.

DL 1412 against its route and carrier
Compared with	Flights	On time	Avg delay	Cancelled	Grade
DL 1412thin sample	346	60.1%	56 min	1.45%	D
All Delta Air Lines on SEA–SFO	985	60.5%	54 min	1.73%	D
All carriers on SEA–SFO	6,817	59.8%	57 min	1.11%	D
Delta Air Lines, whole network	1,039,517	81.1%	71 min	1.74%	B

Across the year

DL 1412 quarter by quarter

DL 1412 did not run the same all year. Its best quarter was Jan–Mar 2026 at 74.7% on time and its weakest Jul–Sep 2026 at 42.6%, a swing of 32 points on roughly 69 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 flights73.3%
Oct–Dec 202577 flights63.2%
Jan–Mar 202686 flights74.7%
Apr–Jun 202691 flights51.6%
Jul–Sep 202662 flights42.6%

Scale runs 35% to 80%.

By weekday, DL 1412 did best on Tuesday at 66.0% on time and worst on Thursday at 49.0%. Each day rests on about 49 flights, so a gap of 17 points is worth noticing but could still narrow in another year.

Arrival by arrival

How late DL 1412 runs when it is late

The 136 late arrivals split 49 under half an hour, 45 between 30 and 60 minutes, and 42 an hour or more.

15+ min early50 flights14.7%
Within 15 min155 flights45.5%
15–29 min late49 flights14.4%
30–59 min late45 flights13.2%
1–2 hours late29 flights8.5%
2+ hours late13 flights3.8%

Scale runs 0% to 100%.

Share of 341 completed flights by arrival against schedule.

Time lost at the gate mostly stays lost. Of 120 departures that left 15 minutes late or more, only 11 made it up before arrival. In the other direction, 27 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 SFO.

The worst days

Worst days for DL 1412

The latest arrival of the period was on 5 October 2025, 5 hours 44 minutes behind schedule; most of its delay minutes were filed as carrier-caused (crew, maintenance, fuelling, baggage). The five worst days are spread across October, July and April, with no single month standing out.

The latest arrivals of DL 1412 in the period
Date	Arrived late by	Largest filed cause
5 October 2025	5 hours 44 minutes	Carrier
12 July 2026	4 hours 6 minutes	Carrier
27 July 2026	4 hours 3 minutes	National Airspace System
21 October 2025	3 hours 29 minutes	Late-arriving aircraft
20 April 2026	3 hours 15 minutes	National Airspace System

Delay causes

Why DL 1412 runs late

National Airspace System accounts for 47% of the 7,607 delay minutes carriers reported here, and the remaining four split what is left.

National Airspace System
47%
Carrier
33%
Late-arriving aircraft
17%
Extreme weather
3%

47% of delay minutes are charged to the National Airspace System: air traffic volume, runway configuration, ground stops. No carrier can price its way out of that, which is why airport choice moves the number here more than carrier choice does. That is 3,598 minutes out of 7,607, against a national NAS share of 21%. The split is drawn from 7,607 delay minutes reported on DL 1412.

Cancellations sit at 1.45% against a national 1.89%, which is ordinary. Diversions add another 0.00%.

Connections and routes

What a delay on this flight costs

12.3% of arrivals land a full hour or more behind schedule, against 8.3% nationally. Ninety minutes is the honest minimum for a connection here, and two hours if the onward flight is on a separate ticket.

The 679 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.

DL 1412 is not only a SEA to SFO flight. It also flew SFO to SEA (346 flights, 74.1% on time) often enough to be scored on its own. Airlines attach one number to several legs of an aircraft's day, and each leg keeps its own record here, so check which city pair is on your booking before reading a rate.

One caution: this is a thin sample. 346 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.

Other routes flown as DL 1412
Also flown as	Flights	On time	Avg delay	Cancelled	Grade
SFO to SEAthin sample	346	74.1%	76 min	1.45%	C

What to do with this

Booking DL 1412

For a booking, DL 1412 is a flight to put a long connection behind. 12.3% of its completed flights arrived an hour or more late, which a short layover will not absorb. If the onward flight is on a separate ticket, the risk sits with you.

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