Flight number record
AS 607
Alaska Airlines · Ontario to Seattle
- Route
- ONT → SEA
- Departs
- 06:00
- Flights
- 294
- Period
- September 2025 to August 2026
Historical statistics for September 2025 to August 2026, not live status. For today’s AS 607, check with Alaska Airlines.
AS 607 earns an A+. Nearly every flight arrives inside the 15-minute window the DOT uses to define an on-time arrival, which puts it 16 points better than the national rate of 77.3%. When something does go wrong the average delay runs a little over an hour. That rests on 294 flights, with a median arrival 10 minutes early.
Set against the rest of the country, AS 607's record is 16 points better than the US average of 77.3%. That gap is worth roughly 162 fewer late arrivals for every thousand flights.
Key figures
On time
93.5%
Arrivals under 15 minutes late, of 292 completed flights
Avg delay
69 min
Across delayed arrivals only, not all flights
Cancelled
0.68%
National rate is 1.89%
1 hour+ late
1.7%
National rate is 8.3%
These figures cover 294 flights between September 2025 and August 2026. The median arrival is 10 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 607 flies
AS 607 flies ONT to SEA without a single fixed slot. Its most common scheduled departure was 06:00, used on 177 of 294 flights, with 06:02 (83 flights) and 06:14 (34 flights) next.
- Departs 06:00177 flights60.2%
- Departs 06:0283 flights28.2%
- Departs 06:1434 flights11.6%
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 06:00 departure sits in the 5am–8am window. Across every US flight scheduled in that window the on-time rate is 89.3%, and AS 607 runs 4 points better at 93.5%. 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 607 next to ONT to SEA
Every carrier on ONT to SEA combined arrived on time 85.9% of the time across 2,488 flights, so AS 607 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 82.2% on time. Across its whole network Alaska Airlines managed 79.7%, which this flight beats by 14 points.
| Compared with | Flights | On time | Avg delay | Cancelled | Grade |
|---|---|---|---|---|---|
| AS 607thin sample | 294 | 93.5% | 69 min | 0.68% | A+ |
| All Alaska Airlines on ONT–SEA | 1,257 | 82.2% | 53 min | 1.75% | B |
| All carriers on ONT–SEA | 2,488 | 85.9% | 67 min | 1.13% | A |
| Alaska Airlines, whole network | 309,844 | 79.7% | 52 min | 1.20% | B |
Across the year
AS 607 quarter by quarter
Quarter by quarter AS 607 held fairly steady: 87.9% in Oct–Dec 2025, 93.2% in Jan–Mar 2026, 96.7% in Apr–Jun 2026 and 95.2% in Jul–Sep 2026. A spread of 9 points is about what a sample of this size moves on its own, so the annual figure is a fair summary.
- Oct–Dec 202567 flights87.9%
- Jan–Mar 202674 flights93.2%
- Apr–Jun 202691 flights96.7%
- Jul–Sep 202662 flights95.2%
Scale runs 80% to 100%.
By weekday, AS 607 ranged from 88.9% on Monday to 95.6% on Sunday. With about 42 flights behind each day, a spread of 7 points is inside normal variation, so the day you fly is not worth changing for this flight.
Arrival by arrival
How late AS 607 runs when it is late
AS 607 often beats the schedule: 100 of 292 completed flights, 34%, arrived 15 minutes or more early. The 19 late arrivals split 4 under half an hour, 10 between 30 and 60 minutes, and 5 an hour or more.
- 15+ min early100 flights34.2%
- Within 15 min173 flights59.2%
- 15–29 min late4 flights1.4%
- 30–59 min late10 flights3.4%
- 1–2 hours late3 flights1.0%
- 2+ hours late2 flights0.7%
Scale runs 0% to 100%.
Share of 292 completed flights by arrival against schedule.
Only 17 of 292 completed flights left 15 minutes late or more, too few to say how often the time is made up.
The worst days
Worst days for AS 607
The latest arrival of the period was on 16 July 2026, 6 hours 7 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 |
|---|---|---|
| 16 July 2026 | 6 hours 7 minutes | Carrier |
| 1 November 2025 | 2 hours 10 minutes | National Airspace System |
| 10 November 2025 | 1 hour 59 minutes | Carrier |
| 5 December 2025 | 1 hour 28 minutes | Carrier |
| 29 October 2025 | 1 hour 7 minutes | National Airspace System |
Delay causes
Why AS 607 runs late
Carrier accounts for 65% of the 1,306 delay minutes carriers reported here, and the remaining four split what is left.
- 65%Carrier
- 35%National Airspace System
The largest share of delay minutes, 65%, falls under carrier control: crew scheduling, maintenance, fuelling, baggage. It accounts for 845 of the 1,306 delay minutes reported here. The split is drawn from 1,306 delay minutes reported on AS 607.
Cancellations are rare at 0.68%, 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 1.7% 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 607 in the data flew ONT 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. 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 607
For a booking, AS 607 has one of the better records a US domestic flight can show: 93.5% on time and 0.68% cancelled. That is a base rate, not a promise about any single day.
Related
Where to go next
- ONT to SEA, every carrier and departure
- SEA to ONT, the return direction
- SkyWest Airlines 4031 on the same route88.5%
- Alaska Airlines 654 on the same route87.3%
- Ontario International (ONT) 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, September 2025 to August 2026. Last updated ; recomputed monthly. How this data is collected.