Flight number record
AS 611
Alaska Airlines · Phoenix to Seattle
- Route
- PHX → SEA
- Departs
- 18:53
- Flights
- 327
- Period
- September 2025 to August 2026
Historical statistics for September 2025 to August 2026, not live status. For today’s AS 611, check with Alaska Airlines.
AS 611 lands a B+, 4 points better than the national rate of 77.3%. Roughly one flight in five arrives 15 minutes late or worse, and those flights are late by about 55 minutes on average. That rests on 327 flights, with a median arrival 7 minutes early.
Set against the rest of the country, AS 611's record is 4 points better than the US average of 77.3%. That gap is worth roughly 42 fewer late arrivals for every thousand flights.
Key figures
On time
81.5%
Arrivals under 15 minutes late, of 324 completed flights
Avg delay
55 min
Across delayed arrivals only, not all flights
Cancelled
0.61%
National rate is 1.89%
1 hour+ late
4.3%
National rate is 8.3%
These figures cover 327 flights between September 2025 and August 2026. The median arrival is 7 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 611 flies
AS 611 flies PHX to SEA without a single fixed slot. Its most common scheduled departure was 18:53, used on 68 of 327 flights, with 19:35 (43 flights) and 18:17 (35 flights) next.
- Departs 18:5368 flights20.8%
- Departs 19:3543 flights13.1%
- Departs 18:1735 flights10.7%
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 18:53 departure sits in the 5pm–8pm window. Across every US flight scheduled in that window the on-time rate is 68.0%, and AS 611 runs 14 points better at 81.5%. By that time of day most aircraft have flown several legs already, and whatever went wrong earlier is still in the schedule.
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Against the route
AS 611 next to PHX to SEA
Every carrier on PHX to SEA combined arrived on time 82.2% of the time across 7,202 flights, so AS 611 is about level with it. Alaska flew 2,886 flights on the same city pair under all its flight numbers, including this one, and those ran 84.4% on time. Across its whole network Alaska Airlines managed 79.7%, which this flight beats by 2 points.
| Compared with | Flights | On time | Avg delay | Cancelled | Grade |
|---|---|---|---|---|---|
| AS 611thin sample | 327 | 81.5% | 55 min | 0.61% | B+ |
| All Alaska Airlines on PHX–SEA | 2,886 | 84.4% | 56 min | 0.76% | B+ |
| All carriers on PHX–SEA | 7,202 | 82.2% | 56 min | 0.69% | B+ |
| Alaska Airlines, whole network | 309,844 | 79.7% | 52 min | 1.20% | B |
Across the year
AS 611 quarter by quarter
AS 611 did not run the same all year. Its best quarter was Jan–Mar 2026 at 87.5% on time and its weakest Jul–Sep 2026 at 71.2%, a swing of 16 points on roughly 82 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 202575 flights80.8%
- Jan–Mar 202680 flights87.5%
- Apr–Jun 202691 flights85.7%
- Jul–Sep 202660 flights71.2%
Scale runs 65% to 95%. Rows with fewer than 30 flights show a dash.
By weekday, AS 611 did best on Saturday at 90.6% on time and worst on Tuesday at 74.4%. Each day rests on about 47 flights, so a gap of 16 points is worth noticing but could still narrow in another year.
Arrival by arrival
How late AS 611 runs when it is late
AS 611 often beats the schedule: 115 of 324 completed flights, 35%, arrived 15 minutes or more early. The 60 late arrivals split 23 under half an hour, 23 between 30 and 60 minutes, and 14 an hour or more.
- 15+ min early115 flights35.5%
- Within 15 min149 flights46.0%
- 15–29 min late23 flights7.1%
- 30–59 min late23 flights7.1%
- 1–2 hours late7 flights2.2%
- 2+ hours late7 flights2.2%
Scale runs 0% to 100%.
Share of 324 completed flights by arrival against schedule.
17 of 64 late departures made up the time and arrived on time, 27% of them. 13 flights left on time and still arrived late.
The worst days
Worst days for AS 611
The latest arrival of the period was on 12 July 2026, 4 hours 26 minutes behind schedule; most of its delay minutes were filed as a late-arriving aircraft. The same cause led on four of the five worst days.
| Date | Arrived late by | Largest filed cause |
|---|---|---|
| 12 July 2026 | 4 hours 26 minutes | Late-arriving aircraft |
| 6 January 2026 | 3 hours 45 minutes | Late-arriving aircraft |
| 26 September 2025 | 2 hours 56 minutes | Late-arriving aircraft |
| 13 March 2026 | 2 hours 44 minutes | Extreme weather |
| 30 July 2026 | 2 hours 24 minutes | Late-arriving aircraft |
Delay causes
Why AS 611 runs late
Late-arriving aircraft accounts for 61% of the 3,271 delay minutes carriers reported here, and the remaining four split what is left.
- 61%Late-arriving aircraft
- 17%National Airspace System
- 13%Carrier
- 10%Extreme weather
61% of delay minutes trace back to a late-arriving aircraft, meaning the plane was already behind before it got here. Across 3,271 reported delay minutes here, that single category outweighs weather by 6 to one. The split is drawn from 3,271 delay minutes reported on AS 611.
Cancellations are rare at 0.61%, 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 4.3% 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 1,107 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.
Every one of the 327 flights under AS 611 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. 327 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 611
For a booking, read AS 611 as 81.5% on time with 0.61% cancelled over 327 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 route84.0%
- Alaska Airlines 603 on the same route87.2%
- Alaska Airlines 645 on the same route85.1%
- Delta Air Lines 2444 on the same route94.2%
- 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
- 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.