Flight number record

AS 453

Alaska Airlines · Houston to Seattle

Route: IAH → SEA
Departs: 07:00
Flights: 334
Period: September 2025 to August 2026

Historical statistics for September 2025 to August 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 77.3%. When something does go wrong the average delay runs roughly 35 minutes. That rests on 334 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 77.3%. That gap is worth roughly 97 fewer late arrivals for every thousand flights.

On time

87.0%

Arrivals under 15 minutes late, of 331 completed flights

Avg delay

36 min

Across delayed arrivals only, not all flights

Cancelled

0.90%

National rate is 1.89%

1 hour+ late

0.9%

National rate is 8.3%

These figures cover 334 flights between September 2025 and August 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.

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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 334 flights, with 06:02 (70 flights) and 06:00 (65 flights) next.

Departs 07:00152 flights45.5%
Departs 06:0270 flights21.0%
Departs 06:0065 flights19.5%

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 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 87.0%. 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

AS 453 next to IAH to SEA

Every carrier on IAH to SEA combined arrived on time 80.7% of the time across 2,072 flights, so AS 453 is 6 points ahead of it. Alaska flew 842 flights on the same city pair under all its flight numbers, including this one, and those ran 81.9% on time. Across its whole network Alaska Airlines managed 79.7%, which this flight beats by 7 points.

AS 453 against its route and carrier
Compared with	Flights	On time	Avg delay	Cancelled	Grade
AS 453thin sample	334	87.0%	36 min	0.90%	A+
All Alaska Airlines on IAH–SEA	842	81.9%	52 min	0.48%	B+
All carriers on IAH–SEA	2,072	80.7%	52 min	0.24%	B+
Alaska Airlines, whole network	309,844	79.7%	52 min	1.20%	B

Across the year

AS 453 quarter by quarter

AS 453 did not run the same all year. Its best quarter was Jul–Sep 2026 at 93.8% on time and its weakest Jan–Mar 2026 at 79.8%, a swing of 14 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 202521 flights—
Oct–Dec 202591 flights85.6%
Jan–Mar 202690 flights79.8%
Apr–Jun 202683 flights90.4%
Jul–Sep 202649 flights93.8%

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 76.0%. Each day rests on about 48 flights, so a gap of 22 points is worth noticing but could still narrow in another year.

Arrival by arrival

How late AS 453 runs when it is late

AS 453 often beats the schedule: 124 of 331 completed flights, 37%, arrived 15 minutes or more early. Most of the lateness is short. 25 of the 43 late arrivals were under half an hour behind, and 3 reached an hour or more.

15+ min early124 flights37.5%
Within 15 min164 flights49.5%
15–29 min late25 flights7.6%
30–59 min late15 flights4.5%
1–2 hours late2 flights0.6%
2+ hours late1 flights0.3%

Scale runs 0% to 100%.

Share of 331 completed flights by arrival against schedule.

A late pushback is often recovered here: of 41 departures that left 15 minutes late or more, 13 still arrived on time. 15 flights left on time and still arrived late.

The worst days

Worst days for AS 453

The latest arrival of the period was on 26 January 2026, 3 hours 5 minutes behind schedule; most of its delay minutes were filed as extreme weather. The five worst days are spread across January, November, December, April and October, with no single month standing out.

The latest arrivals of AS 453 in the period
Date	Arrived late by	Largest filed cause
26 January 2026	3 hours 5 minutes	Extreme weather
24 November 2025	1 hour 37 minutes	Late-arriving aircraft
8 December 2025	1 hour 36 minutes	Carrier
13 April 2026	56 minutes	National Airspace System
26 October 2025	55 minutes	National Airspace System

Delay causes

Why AS 453 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 1,551 reported delay minutes.

National Airspace System
33%
Late-arriving aircraft
26%
Carrier
25%
Extreme weather
14%
Security
3%

Extreme weather accounts for 14% 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 2.3 times the usual weather exposure. The split is drawn from 1,551 delay minutes reported on AS 453.

Cancellations sit at 0.90% against a national 1.89%, 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 0.9% 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 1,874 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.

The same number turns up on one other city pair in the data, including SEA to PDX (13), but none flew often enough under AS 453 to report a rate for. Carriers move flight numbers between routes, so the figures on this page apply to IAH to SEA 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 453

For a booking, AS 453 has one of the better records a US domestic flight can show: 87.0% on time and 0.90% 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, September 2025 to August 2026. Last updated 22 October 2026; recomputed monthly. How this data is collected.

Key figures