Flight number record
AS 645
Alaska Airlines · Phoenix to Seattle
- Route
- PHX → SEA
- Departs
- 07:00
- Flights
- 330
- Period
- July 2025 to June 2026
Historical statistics for July 2025 to June 2026, not live status. For today’s AS 645, check with Alaska Airlines.
AS 645 earns a B+. More than four flights in five arrive inside the 15-minute window the DOT uses to define an on-time arrival, which puts it 7 points better than the national rate of 77.6%. When something does go wrong the average delay runs roughly 45 minutes. That rests on 330 flights, with a median arrival 5 minutes early.
Set against the rest of the country, AS 645's record is 7 points better than the US average of 77.6%. That gap is worth roughly 66 fewer late arrivals for every thousand flights.
Key figures
On time
84.2%
Arrivals under 15 minutes late, of 329 completed flights
Avg delay
46 min
Across delayed arrivals only, not all flights
Cancelled
0.00%
National rate is 1.81%
1 hour+ late
2.4%
National rate is 8.1%
These figures cover 330 flights between July 2025 and June 2026. The median arrival is 5 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 645 flies
AS 645 flies PHX to SEA without a single fixed slot. Its most common scheduled departure was 07:00, used on 95 of 330 flights, with 08:00 (71 flights) and 08:20 (59 flights) next. Carriers retime flights through the season, so the rates here blend slightly different positions in the aircraft's day.
- Departs 07:0095 flights28.8%
- Departs 08:0071 flights21.5%
- Departs 08:2059 flights17.9%
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 645 runs 5 points worse at 84.2%. 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 645 next to PHX to SEA
Every carrier on PHX to SEA combined arrived on time 82.7% of the time across 7,269 flights, so AS 645 is 2 points ahead of it. Alaska flew 2,903 flights on the same city pair under all its flight numbers, including this one, and those ran 84.9% on time. Across its whole network Alaska Airlines managed 79.1%, which this flight beats by 5 points.
| Compared with | Flights | On time | Avg delay | Cancelled | Grade |
|---|---|---|---|---|---|
| AS 645thin sample | 330 | 84.2% | 46 min | 0.00% | B+ |
| All Alaska Airlines on PHX–SEA | 2,903 | 84.9% | 56 min | 0.76% | B+ |
| All carriers on PHX–SEA | 7,269 | 82.7% | 55 min | 0.65% | B+ |
| Alaska Airlines, whole network | 293,372 | 79.1% | 52 min | 1.28% | B |
Across the year
AS 645 quarter by quarter
AS 645 did not run the same all year. Its best quarter was Apr–Jun 2026 at 88.9% on time and its weakest Jul–Sep 2025 at 75.0%, a swing of 14 points on roughly 83 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 flights75.0%
- Oct–Dec 202590 flights87.8%
- Jan–Mar 202685 flights86.9%
- Apr–Jun 202663 flights88.9%
Scale runs 65% to 95%. Rows with fewer than 30 flights show a dash.
By weekday, AS 645 ranged from 79.2% on Monday to 89.8% on Tuesday. With about 47 flights behind each day, a spread of 11 points is inside normal variation, so the day you fly is not worth changing for this flight.
Delay causes
Why AS 645 runs late
One category carries most of the weight here. Carrier accounts for 49% of the 2,413 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.
- 49%Carrier
- 38%National Airspace System
- 13%Late-arriving aircraft
- 0%Security
The largest share of delay minutes, 49%, falls under carrier control: crew scheduling, maintenance, fuelling, baggage. Unlike weather, that is a management outcome, and it is the category where the gap between two carriers on the same schedule is genuinely earned. It accounts for 1,177 of the 2,413 delay minutes reported here. The split is drawn from 2,413 delay minutes reported on AS 645.
Cancellations are rare at 0.00%, below the national 1.81% and low enough to earn the plus on the grade. Almost no flights are 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 2.4% 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 1,107 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 330 flights under AS 645 in the data flew PHX 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. 330 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 645
For a booking, read AS 645 as 84.2% on time with 0.00% cancelled over 330 flights. Those are rates from the past twelve months, not a forecast for any particular day.
Related
Where to go next
- PHX to SEA, every carrier and departure
- SEA to PHX, the return direction
- Delta Air Lines 2419 on the same route92.8%
- Alaska Airlines 637 on the same route87.6%
- Delta Air Lines 2444 on the same route95.2%
- Alaska Airlines 603 on the same route88.7%
- Alaska Airlines 611 on the same route79.8%
- Phoenix Sky Harbor International (PHX) delay statistics
- 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
- Worst months to fly in the US, ranked by the data
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.