Flight number record

AS 453

Alaska Airlines · Houston to Seattle

Route: IAH → SEA
Departs: 07:00
Flights: 344
Period: July 2025 to June 2026

Historical statistics for July 2025 to June 2026, not live status. For today’s AS 453, check with Alaska Airlines.

AS 453 earns an A+. Close to nine flights in ten arrive inside the 15-minute window the DOT uses to define an on-time arrival, which puts it 10 points better than the national rate of 77.6%. When something does go wrong the average delay runs roughly 40 minutes. That rests on 344 flights, with a median arrival 9 minutes early.

Set against the rest of the country, AS 453's record is 10 points better than the US average of 77.6%. That gap is worth roughly 95 fewer late arrivals for every thousand flights.

On time

87.1%

Arrivals under 15 minutes late, of 341 completed flights

Avg delay

41 min

Across delayed arrivals only, not all flights

Cancelled

0.87%

National rate is 1.81%

1 hour+ late

1.2%

National rate is 8.1%

These figures cover 344 flights between July 2025 and June 2026. The median arrival is 9 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 453 flies

AS 453 flies IAH to SEA without a single fixed slot. Its most common scheduled departure was 07:00, used on 152 of 344 flights, with 06:00 (124 flights) next. Carriers retime flights through the season, so the rates here blend slightly different positions in the aircraft's day.

Departs 07:00152 flights44.2%
Departs 06:00124 flights36.0%

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 07:00 departure sits in the 5am–8am window. Across every US flight scheduled in that window the on-time rate is 89.3%, and AS 453 runs 2 points worse at 87.1%. 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 453 next to IAH to SEA

Every carrier on IAH to SEA combined arrived on time 77.5% of the time across 2,095 flights, so AS 453 is 10 points ahead of it. Alaska flew 852 flights on the same city pair under all its flight numbers, including this one, and those ran 78.5% on time. Across its whole network Alaska Airlines managed 79.1%, which this flight beats by 8 points.

AS 453 against its route and carrier
Compared with	Flights	On time	Avg delay	Cancelled	Grade
AS 453thin sample	344	87.1%	41 min	0.87%	A+
All Alaska Airlines on IAH–SEA	852	78.5%	51 min	0.70%	B+
All carriers on IAH–SEA	2,095	77.5%	54 min	0.53%	B+
Alaska Airlines, whole network	293,372	79.1%	52 min	1.28%	B

Across the year

AS 453 quarter by quarter

AS 453 did not run the same all year. Its best quarter was Jul–Sep 2025 at 93.7% on time and its weakest Jan–Mar 2026 at 79.8%, a swing of 14 points on roughly 86 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 202580 flights93.7%
Oct–Dec 202591 flights85.6%
Jan–Mar 202690 flights79.8%
Apr–Jun 202683 flights90.4%

Scale runs 70% to 100%. Rows with fewer than 30 flights show a dash.

By weekday, AS 453 did best on Friday at 98.0% on time and worst on Monday at 75.0%. Each day rests on about 49 flights, so a gap of 23 points is worth noticing but could still narrow in another year.

Delay causes

Why AS 453 runs late

One category carries most of the weight here. National Airspace System accounts for 43% of the 1,808 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
43%
Late-arriving aircraft
22%
Carrier
21%
Extreme weather
12%
Security
2%

Extreme weather accounts for 12% 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 1.9 times the usual weather exposure. The split is drawn from 1,808 delay minutes reported on AS 453.

Cancellations are rare at 0.87%, below the national 1.81% and low enough to earn the plus on the grade. Roughly one flight in 100 is 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 1.2% 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 1,874 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 344 flights under AS 453 in the data flew IAH 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. 344 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 453

For a booking, AS 453 has one of the better records a US domestic flight can show: 87.1% on time and 0.87% cancelled. That is a base rate, not a promise about any single 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