Flight number record
AS 648
Alaska Airlines · Seattle to Tucson
- Route
- SEA → TUS
- Departs
- 10:19
- Flights
- 359
- Period
- September 2025 to August 2026
Historical statistics for September 2025 to August 2026, not live status. For today’s AS 648, check with Alaska Airlines.
AS 648 lands a B+, level with the national rate of 77.3%. Roughly one flight in four arrives 15 minutes late or worse, and those flights are late by about 40 minutes on average. That rests on 359 flights, with a median arrival 3 minutes early.
Key figures
On time
77.7%
Arrivals under 15 minutes late, of 358 completed flights
Avg delay
40 min
Across delayed arrivals only, not all flights
Cancelled
0.28%
National rate is 1.89%
1 hour+ late
2.8%
National rate is 8.3%
These figures cover 359 flights between September 2025 and August 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.
Fare search by Aviasales, a Travelpayouts partner. Booking through it may earn this site a commission at no cost to you; it changes no figure here.
Schedule
When AS 648 flies
AS 648 flies SEA to TUS without a single fixed slot. Its most common scheduled departure was 10:19, used on 70 of 359 flights, with 11:37 (58 flights) and 11:32 (42 flights) next.
- Departs 10:1970 flights19.5%
- Departs 11:3758 flights16.2%
- Departs 11:3242 flights11.7%
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 10:19 departure sits in the 8am–11am window. Across every US flight scheduled in that window the on-time rate is 83.9%, and AS 648 runs 6 points worse at 77.7%. Early departures usually start with an aircraft that has not flown yet that day, which is most of why the window does well.
Timetable by Aviasales, a Travelpayouts partner. Booking through it may earn this site a commission at no cost to you; it changes no figure here.
Against the route
AS 648 next to SEA to TUS
Every carrier on SEA to TUS combined arrived on time 82.5% of the time across 1,065 flights, so AS 648 is 5 points behind it. Alaska flew 556 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 79.7%, which this flight trails by 2 points.
| Compared with | Flights | On time | Avg delay | Cancelled | Grade |
|---|---|---|---|---|---|
| AS 648thin sample | 359 | 77.7% | 40 min | 0.28% | B+ |
| All Alaska Airlines on SEA–TUS | 556 | 78.5% | 38 min | 0.54% | B+ |
| All carriers on SEA–TUS | 1,065 | 82.5% | 48 min | 0.47% | B+ |
| Alaska Airlines, whole network | 309,844 | 79.7% | 52 min | 1.20% | 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 96.7% on time and its weakest Oct–Dec 2025 at 61.6%, a swing of 35 points on roughly 72 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 202530 flights96.7%
- Oct–Dec 202586 flights61.6%
- Jan–Mar 202690 flights76.4%
- Apr–Jun 202691 flights87.9%
- Jul–Sep 202662 flights77.4%
Scale runs 55% to 100%.
By weekday, AS 648 did best on Wednesday at 83.7% on time and worst on Sunday at 67.3%. Each day rests on about 51 flights, so a gap of 16 points is worth noticing but could still narrow in another year.
Arrival by arrival
How late AS 648 runs when it is late
The 80 late arrivals split 37 under half an hour, 33 between 30 and 60 minutes, and 10 an hour or more.
- 15+ min early87 flights24.3%
- Within 15 min191 flights53.4%
- 15–29 min late37 flights10.3%
- 30–59 min late33 flights9.2%
- 1–2 hours late5 flights1.4%
- 2+ hours late5 flights1.4%
Scale runs 0% to 100%.
Share of 358 completed flights by arrival against schedule.
27 of 95 late departures made up the time and arrived on time, 28% of them. 12 flights left on time and still arrived late.
The worst days
Worst days for AS 648
The latest arrival of the period was on 5 July 2026, 3 hours 29 minutes behind schedule; most of its delay minutes were filed as carrier-caused (crew, maintenance, fuelling, baggage). The same cause led on three of the five worst days.
| Date | Arrived late by | Largest filed cause |
|---|---|---|
| 5 July 2026 | 3 hours 29 minutes | Carrier |
| 22 December 2025 | 2 hours 21 minutes | Late-arriving aircraft |
| 16 July 2026 | 2 hours 11 minutes | Extreme weather |
| 26 January 2026 | 2 hours 6 minutes | Carrier |
| 9 May 2026 | 2 hours 1 minute | Carrier |
Delay causes
Why AS 648 runs late
Carrier accounts for 52% of the 3,222 delay minutes carriers reported here, and the remaining four split what is left.
- 52%Carrier
- 33%Late-arriving aircraft
- 11%National Airspace System
- 4%Extreme weather
The largest share of delay minutes, 52%, falls under carrier control: crew scheduling, maintenance, fuelling, baggage. It accounts for 1,672 of the 3,222 delay minutes reported here. The split is drawn from 3,222 delay minutes reported on AS 648.
Cancellations are rare at 0.28%, below the national 1.89% 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 2.8% 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.
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.
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 77.7% on time with 0.28% cancelled over 359 flights. Those are rates from the past twelve months, not a forecast for any particular day.
Related
Where to go next
- SEA to TUS, every carrier and departure
- TUS to SEA, the return direction
- Seattle-Tacoma International (SEA) delay statistics
- Alaska Airlines on-time record
- Every Alaska Airlines flight number with a record
- The most and least reliable flight numbers in the US
- Why the first flight of the morning is statistically safest
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 ; recomputed monthly. How this data is collected.