Flight number record
AS 1364
Alaska Airlines · Seattle to Ontario
- Route
- SEA → ONT
- Departs
- 08:30
- Flights
- 294
- Period
- September 2025 to August 2026
Historical statistics for September 2025 to August 2026, not live status. For today’s AS 1364, check with Alaska Airlines.
AS 1364 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 13 points better than the national rate of 77.3%. When something does go wrong the average delay runs roughly 45 minutes. That rests on 294 flights, with a median arrival 8 minutes early.
Set against the rest of the country, AS 1364's record is 13 points better than the US average of 77.3%. That gap is worth roughly 128 fewer late arrivals for every thousand flights.
Key figures
On time
90.1%
Arrivals under 15 minutes late, of 283 completed flights
Avg delay
44 min
Across delayed arrivals only, not all flights
Cancelled
3.74%
National rate is 1.89%
1 hour+ late
2.5%
National rate is 8.3%
These figures cover 294 flights between September 2025 and August 2026. The median arrival is 8 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 1364 flies
AS 1364 flies SEA to ONT without a single fixed slot. Its most common scheduled departure was 08:30, used on 68 of 294 flights, with 08:33 (59 flights) and 07:00 (35 flights) next.
- Departs 08:3068 flights23.1%
- Departs 08:3359 flights20.1%
- Departs 07:0035 flights11.9%
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 08:30 departure sits in the 8am–11am window. Across every US flight scheduled in that window the on-time rate is 83.9%, and AS 1364 runs 6 points better at 90.1%. 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 1364 next to SEA to ONT
Every carrier on SEA to ONT combined arrived on time 82.6% of the time across 2,487 flights, so AS 1364 is 8 points ahead of it. Alaska flew 1,257 flights on the same city pair under all its flight numbers, including this one, and those ran 77.5% on time. Across its whole network Alaska Airlines managed 79.7%, which this flight beats by 10 points.
| Compared with | Flights | On time | Avg delay | Cancelled | Grade |
|---|---|---|---|---|---|
| AS 1364thin sample | 294 | 90.1% | 44 min | 3.74% | A− |
| All Alaska Airlines on SEA–ONT | 1,257 | 77.5% | 46 min | 1.51% | B |
| All carriers on SEA–ONT | 2,487 | 82.6% | 50 min | 1.05% | B |
| Alaska Airlines, whole network | 309,844 | 79.7% | 52 min | 1.20% | B |
Across the year
AS 1364 quarter by quarter
AS 1364 did not run the same all year. Its best quarter was Apr–Jun 2026 at 97.7% on time and its weakest Oct–Dec 2025 at 80.6%, a swing of 17 points on roughly 74 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.
- Oct–Dec 202567 flights80.6%
- Jan–Mar 202674 flights90.4%
- Apr–Jun 202691 flights97.7%
- Jul–Sep 202662 flights88.5%
Scale runs 70% to 100%.
By weekday, AS 1364 did best on Saturday at 94.6% on time and worst on Friday at 82.1%. Each day rests on about 42 flights, so a gap of 13 points is worth noticing but could still narrow in another year.
Arrival by arrival
How late AS 1364 runs when it is late
AS 1364 often beats the schedule: 81 of 283 completed flights, 29%, arrived 15 minutes or more early. Most of the lateness is short. 15 of the 28 late arrivals were under half an hour behind, and 7 reached an hour or more.
- 15+ min early81 flights28.6%
- Within 15 min174 flights61.5%
- 15–29 min late15 flights5.3%
- 30–59 min late6 flights2.1%
- 1–2 hours late5 flights1.8%
- 2+ hours late2 flights0.7%
Scale runs 0% to 100%.
Share of 283 completed flights by arrival against schedule.
A late pushback is often recovered here: of 27 departures that left 15 minutes late or more, 10 still arrived on time. 11 flights left on time and still arrived late.
The worst days
Worst days for AS 1364
The latest arrival of the period was on 13 March 2026, 2 hours 10 minutes behind schedule; most of its delay minutes were filed as national airspace system delay. Three of the five worst days fell in March 2026.
| Date | Arrived late by | Largest filed cause |
|---|---|---|
| 13 March 2026 | 2 hours 10 minutes | National Airspace System |
| 31 December 2025 | 2 hours 5 minutes | Carrier |
| 15 March 2026 | 1 hour 39 minutes | Late-arriving aircraft |
| 28 March 2026 | 1 hour 33 minutes | Carrier |
| 1 November 2025 | 1 hour 30 minutes | Carrier |
Delay causes
Why AS 1364 runs late
Carrier accounts for 50% of the 1,228 delay minutes carriers reported here, and the remaining four split what is left.
- 50%Carrier
- 41%National Airspace System
- 10%Late-arriving aircraft
The largest share of delay minutes, 50%, falls under carrier control: crew scheduling, maintenance, fuelling, baggage. It accounts for 608 of the 1,228 delay minutes reported here. The split is drawn from 1,228 delay minutes reported on AS 1364.
Cancellations run at 3.74%, against 1.89% nationally. That is about one flight in 25 cancelled outright. A cancelled flight is invisible in every on-time figure on this page, so the punctuality numbers above describe only the flights that actually operated.
Connections and routes
What a delay on this flight costs
Badly late arrivals are rare here: only 2.5% 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 956 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 294 flights under AS 1364 in the data flew SEA to ONT. 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. 294 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 1364
For a booking, the cancellation rate is the figure to plan around on AS 1364: 3.74% of its 294 scheduled flights did not operate. A late arrival costs roughly 45 minutes, but a cancellation costs the day, so leave a later option open.
Related
Where to go next
- SEA to ONT, every carrier and departure
- ONT to SEA, the return direction
- SkyWest Airlines 4031 on the same route86.7%
- Seattle-Tacoma International (SEA) delay statistics
- Ontario International (ONT) 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
- What a cancellation rate actually tells you (and what it hides)
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.