Flight number record

AS 648

Alaska Airlines · Seattle to Tucson

Route: SEA → TUS
Departs: 11:37
Flights: 359
Period: July 2025 to June 2026

Historical statistics for July 2025 to June 2026, not live status. For today’s AS 648, check with Alaska Airlines.

AS 648 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 about 40 minutes on average. That is a workable record, not a spotless one. That rests on 359 flights, with a median arrival 4 minutes early.

On time

80.7%

Arrivals under 15 minutes late, of 358 completed flights

Avg delay

39 min

Across delayed arrivals only, not all flights

Cancelled

0.28%

National rate is 1.81%

1 hour+ late

2.2%

National rate is 8.1%

These figures cover 359 flights between July 2025 and June 2026. The median arrival is 4 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 648 flies

AS 648 flies SEA to TUS without a single fixed slot. Its most common scheduled departure was 11:37, used on 58 of 359 flights, with 08:05 (45 flights) and 08:00 (43 flights) next. Carriers retime flights through the season, so the rates here blend slightly different positions in the aircraft's day.

Departs 11:3758 flights16.2%
Departs 08:0545 flights12.5%
Departs 08:0043 flights12.0%

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 11:37 departure sits in the 11am–2pm window. Across every US flight scheduled in that window the on-time rate is 78.8%, and AS 648 runs level with that at 80.7%. Midday slots inherit some of the morning's delays without yet carrying the full weight of the evening's.

Against the route

AS 648 next to SEA to TUS

Every carrier on SEA to TUS combined arrived on time 81.8% of the time across 1,065 flights, so AS 648 is about level with it. Alaska flew 556 flights on the same city pair under all its flight numbers, including this one, and those ran 80.5% on time. Across its whole network Alaska Airlines managed 79.1%, which this flight beats by 2 points.

AS 648 against its route and carrier
Compared with	Flights	On time	Avg delay	Cancelled	Grade
AS 648thin sample	359	80.7%	39 min	0.28%	B+
All Alaska Airlines on SEA–TUS	556	80.5%	37 min	0.54%	B+
All carriers on SEA–TUS	1,065	81.8%	46 min	0.47%	B+
Alaska Airlines, whole network	293,372	79.1%	52 min	1.28%	B

Across the year

AS 648 quarter by quarter

AS 648 did not run the same all year. Its best quarter was Jul–Sep 2025 at 95.7% on time and its weakest Oct–Dec 2025 at 61.6%, a swing of 34 points on roughly 90 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 flights95.7%
Oct–Dec 202586 flights61.6%
Jan–Mar 202690 flights76.4%
Apr–Jun 202691 flights87.9%

Scale runs 55% to 100%. Rows with fewer than 30 flights show a dash.

By weekday, AS 648 did best on Wednesday at 85.7% on time and worst on Sunday at 73.1%. Each day rests on about 51 flights, so a gap of 13 points is worth noticing but could still narrow in another year.

Delay causes

Why AS 648 runs late

One category carries most of the weight here. Carrier accounts for 51% of the 2,690 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.

Carrier
51%
Late-arriving aircraft
37%
National Airspace System
12%

37% of delay minutes trace back to a late-arriving aircraft, meaning the plane was already behind before it got here. That is a cascade, and cascades start small and grow through the day. Across 2,690 reported delay minutes here, that single category outweighs weather by 37 to one. It is the strongest argument for booking the first departure of the morning, when the aircraft has been sitting at the gate overnight with nothing to inherit. The split is drawn from 2,690 delay minutes reported on AS 648.

Cancellations are rare at 0.28%, 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 2.2% 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.

The 1,215 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. It is also long enough that the aircraft usually flies three or four legs a day rather than six, which slows how fast delay compounds.

Every one of the 359 flights under AS 648 in the data flew SEA to TUS. 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. 359 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 648

For a booking, read AS 648 as 80.7% on time with 0.28% cancelled over 359 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