Flight number record

AS 543

Alaska Airlines · Dallas-Fort Worth to Seattle

Route: DFW → SEA
Departs: 10:00
Flights: 298
Period: July 2025 to June 2026

Historical statistics for July 2025 to June 2026, not live status. For today’s AS 543, check with Alaska Airlines.

AS 543 lands a B, 3 points better than the national rate of 77.6%. About one flight in five arrives 15 minutes late or worse, and those flights are late by roughly 55 minutes on average. That is a workable record, not a spotless one. That rests on 298 flights, with a median arrival 6 minutes early.

On time

80.5%

Arrivals under 15 minutes late, of 293 completed flights

Avg delay

53 min

Across delayed arrivals only, not all flights

Cancelled

1.68%

National rate is 1.81%

1 hour+ late

5.1%

National rate is 8.1%

These figures cover 298 flights between July 2025 and June 2026. The median arrival is 6 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 543 flies

AS 543 flies DFW to SEA without a single fixed slot. Its most common scheduled departure was 10:00, used on 74 of 298 flights, with 13:00 (50 flights) and 09:00 (34 flights) next. Carriers retime flights through the season, so the rates here blend slightly different positions in the aircraft's day.

Departs 10:0074 flights24.8%
Departs 13:0050 flights16.8%
Departs 09:0034 flights11.4%

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 10:00 departure sits in the 8am–11am window. Across every US flight scheduled in that window the on-time rate is 84.1%, and AS 543 runs 4 points worse at 80.5%. Early departures usually start with an aircraft that has not flown yet that day, which is most of why the window does well.

Against the route

AS 543 next to DFW to SEA

Every carrier on DFW to SEA combined arrived on time 69.5% of the time across 5,232 flights, so AS 543 is 11 points ahead of it. Alaska flew 1,756 flights on the same city pair under all its flight numbers, including this one, and those ran 72.7% on time. Across its whole network Alaska Airlines managed 79.1%, close to this flight's figure.

AS 543 against its route and carrier
Compared with	Flights	On time	Avg delay	Cancelled	Grade
AS 543thin sample	298	80.5%	53 min	1.68%	B
All Alaska Airlines on DFW–SEA	1,756	72.7%	57 min	1.48%	C
All carriers on DFW–SEA	5,232	69.5%	64 min	2.12%	C
Alaska Airlines, whole network	293,372	79.1%	52 min	1.28%	B

Across the year

AS 543 quarter by quarter

AS 543 did not run the same all year. Its best quarter was Apr–Jun 2026 at 92.9% on time and its weakest Jul–Sep 2025 at 74.4%, a swing of 19 points on roughly 75 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 202592 flights74.4%
Oct–Dec 202588 flights78.2%
Jan–Mar 202676 flights83.8%
Apr–Jun 202642 flights92.9%

Scale runs 65% to 100%. Rows with fewer than 30 flights show a dash.

By weekday, AS 543 did best on Wednesday at 88.4% on time and worst on Saturday at 75.0%. Each day rests on about 43 flights, so a gap of 13 points is worth noticing but could still narrow in another year.

Delay causes

Why AS 543 runs late

One category carries most of the weight here. National Airspace System accounts for 44% of the 3,040 delay minutes carriers reported, and the remaining four split what is left. The split is by minutes rather than by flights, so a few very long delays count for as much as many short ones.

National Airspace System
44%
Carrier
29%
Late-arriving aircraft
20%
Extreme weather
7%

44% 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 1,350 minutes out of 3,040, against a national NAS share of 21%. The split is drawn from 3,040 delay minutes reported on AS 543.

Cancellations sit at 1.68% against a national 1.81%, which is ordinary. Diversions add another 0.00%.

Connections and routes

What a delay on this flight costs

5.1% of arrivals land an hour or more late, close to the national 8.1%. That is the figure that decides a connection, and it says a 60 to 75 minute layover is reasonable here while anything under 45 minutes is a bet. Most delays on this route last roughly 55 minutes, which a normal layover absorbs.

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 298 flights under AS 543 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. 298 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 543

For a booking, read AS 543 as 80.5% on time with 1.68% cancelled over 298 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