Flight number record

AS 424

Alaska Airlines · Seattle to Dallas-Fort Worth

Route: SEA → DFW
Departs: 17:59
Flights: 334
Period: July 2025 to June 2026

Historical statistics for July 2025 to June 2026, not live status. For today’s AS 424, check with Alaska Airlines.

AS 424 lands a B+, level with the national rate of 77.6%. Roughly one flight in five arrives 15 minutes late or worse, and those flights are late by roughly 40 minutes on average. That is a workable record, not a spotless one. That rests on 334 flights, with a median arrival 3 minutes early.

On time

78.2%

Arrivals under 15 minutes late, of 331 completed flights

Avg delay

42 min

Across delayed arrivals only, not all flights

Cancelled

0.90%

National rate is 1.81%

1 hour+ late

3.6%

National rate is 8.1%

These figures cover 334 flights between July 2025 and June 2026. The median arrival is 3 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 AS 424 flies

AS 424 flies SEA to DFW without a single fixed slot. Its most common scheduled departure was 17:59, used on 74 of 334 flights, with 17:56 (66 flights) and 17:58 (57 flights) next. Carriers retime flights through the season, so the rates here blend slightly different positions in the aircraft's day.

Departs 17:5974 flights22.2%
Departs 17:5666 flights19.8%
Departs 17:5857 flights17.1%

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 17:59 departure sits in the 5pm–8pm window. Across every US flight scheduled in that window the on-time rate is 68.2%, and AS 424 runs 10 points better at 78.2%. 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

AS 424 next to SEA to DFW

Every carrier on SEA to DFW combined arrived on time 77.6% of the time across 5,233 flights, so AS 424 is about level with it. Alaska flew 1,755 flights on the same city pair under all its flight numbers, including this one, and those ran 78.9% on time. Across its whole network Alaska Airlines managed 79.1%, close to this flight's figure.

AS 424 against its route and carrier
Compared with	Flights	On time	Avg delay	Cancelled	Grade
AS 424thin sample	334	78.2%	42 min	0.90%	B+
All Alaska Airlines on SEA–DFW	1,755	78.9%	44 min	1.03%	B
All carriers on SEA–DFW	5,233	77.6%	79 min	2.04%	B
Alaska Airlines, whole network	293,372	79.1%	52 min	1.28%	B

Across the year

AS 424 quarter by quarter

AS 424 did not run the same all year. Its best quarter was Oct–Dec 2025 at 86.4% on time and its weakest Jul–Sep 2025 at 67.8%, a swing of 19 points on roughly 84 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 202591 flights67.8%
Oct–Dec 202589 flights86.4%
Jan–Mar 202684 flights84.3%
Apr–Jun 202670 flights74.3%

Scale runs 60% to 90%. Rows with fewer than 30 flights show a dash.

By weekday, AS 424 did best on Wednesday at 87.5% on time and worst on Friday at 67.4%. Each day rests on about 48 flights, so a gap of 20 points is worth noticing but could still narrow in another year.

Delay causes

Why AS 424 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 3,017 reported delay minutes.

Carrier
37%
Late-arriving aircraft
30%
National Airspace System
24%
Extreme weather
9%

The largest share of delay minutes, 37%, falls under carrier control: crew scheduling, maintenance, fuelling, baggage. Unlike weather, that is a management outcome, and it is the category where the gap between two carriers on the same schedule is genuinely earned. It accounts for 1,122 of the 3,017 delay minutes reported here. The split is drawn from 3,017 delay minutes reported on AS 424.

Cancellations sit at 0.90% against a national 1.81%, which is ordinary. Diversions add another 0.00%.

Connections and routes

What a delay on this flight costs

Badly late arrivals are rare here: only 3.6% land an hour or more behind schedule, against 8.1% 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.

The same number turns up on two other city pairs in the data, including PSP to SFO (2) and SFO to PSP (2), but none flew often enough under AS 424 to report a rate for. Carriers move flight numbers between routes, so the figures on this page apply to SEA to DFW only.

One caution: this is a thin sample. 334 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 AS 424

For a booking, read AS 424 as 78.2% on time with 0.90% cancelled over 334 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 Alaska Airlines’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