Carrier route record
ASOAK→SEA
Alaska Airlines · Oakland to Seattle
- Flights
- 785
- Period
- September 2025 to August 2026
- Share of route
- 41%
- Carriers
- 3
Historical statistics for September 2025 to August 2026, not live status. For today’s flights, check with Alaska Airlines.
Alaska on OAK to SEA lands a B, 5 points better than the national rate of 77.3%. About one flight in six arrives 15 minutes late or worse, and those flights are late by about 45 minutes on average. That rests on 785 flights, with a median arrival 5 minutes early.
Set against the rest of the country, Alaska's OAK to SEA record is 5 points better than the US average of 77.3%. That gap is worth roughly 46 fewer late arrivals for every thousand flights.
Key figures
On time
81.9%
Arrivals under 15 minutes late, of 773 completed flights
Avg delay
45 min
Across delayed arrivals only, not all flights
Cancelled
1.53%
National rate is 1.89%
Whole route
77.3%
Every carrier on OAK to SEA, 1,896 flights
These figures cover 785 flights between September 2025 and August 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.
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Carrier by carrier
Alaska against every carrier on OAK to SEA
Alaska flew 785 of the 1,896 flights on OAK to SEA, about 41% of it. Its 81.9% on time is 5 points better than the route as a whole, which runs 77.3%. Ranked by on-time rate it is number two of three carriers on the route, where the range runs from SkyWest at 94.7% to Southwest at 73.8%. One of those carriers flew fewer than 365 flights here, so treat their positions as rough.
Only one carrier clears this site's 365-flight floor here, so there is no comparison to draw. The table below is the full picture.
| Airline | Flights | On time | Avg delay | Cancelled | Grade |
|---|---|---|---|---|---|
| SkyWest Airlinesthin sample | 21 | 94.7% | 22 min | 9.52% | A− |
| Alaska Airlines (this page) | 785 | 81.9% | 45 min | 1.53% | B |
| Southwest Airlines | 1,090 | 73.8% | 48 min | 0.28% | C+ |
Flight by flight
Alaska flight numbers on OAK to SEA
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Departure window
When Alaska runs best on this route
Departure time matters more here than the choice of carrier. The gap between the best and worst window is 21 points, against half a point between the best and worst carrier.
- 5am–8am323 flights91.8%
- 8am–11am119 flights82.9%
- 11am–2pm29 flights—
- 2pm–5pm207 flights70.7%
- 5pm–8pm89 flights78.2%
- 8pm–5am18 flights—
Scale runs 60% to 95%. Rows with fewer than 30 flights show a dash.
Book the early departure. Flights leaving between 5am–8am arrive on time 91.8% of the time, against 70.7% for the afternoon window. That is 21 points of difference for no extra money, and it comes from the same aircraft having had no earlier flight to fall behind on. The 5am–8am window is the busiest, with 323 flights scheduled in it.
Across the year
Alaska on OAK to SEA through the year
December is the weak month at 71.2% on time, against 94.1% in February. Winter delays cluster: a single storm system can account for most of a month's shortfall, so an average December hides both very good weeks and genuinely unflyable days. August was the busiest month here, with 107 flights.
Across the week, Saturday is the strongest day at 87.3% on time and Sunday the weakest at 77.1%, a spread of 10 points.
Arrival by arrival
How late Alaska on OAK to SEA runs when it is late
The 140 late arrivals split 64 under half an hour, 51 between 30 and 60 minutes, and 25 an hour or more.
- 15+ min early189 flights24.5%
- Within 15 min444 flights57.4%
- 15–29 min late64 flights8.3%
- 30–59 min late51 flights6.6%
- 1–2 hours late19 flights2.5%
- 2+ hours late6 flights0.8%
Scale runs 0% to 100%.
Share of 773 completed flights by arrival against schedule.
24 of 132 late departures made up the time and arrived on time, 18% of them. 32 flights left on time and still arrived late.
The worst days
Worst days for Alaska on OAK to SEA
The latest arrival of the period was on 27 March 2026, 7 hours 42 minutes behind schedule; most of its delay minutes were filed as carrier-caused (crew, maintenance, fuelling, baggage). On three of the five worst days the largest share was filed as a late-arriving aircraft.
| Date | Arrived late by | Largest filed cause |
|---|---|---|
| 27 March 2026 | 7 hours 42 minutes | Carrier |
| 9 December 2025 | 2 hours 44 minutes | Carrier |
| 10 December 2025 | 2 hours 24 minutes | Late-arriving aircraft |
| 21 June 2026 | 2 hours 22 minutes | Late-arriving aircraft |
| 25 January 2026 | 2 hours 21 minutes | Late-arriving aircraft |
Delay causes
Why Alaska runs late on this route
Late-arriving aircraft accounts for 45% of the 6,236 delay minutes carriers reported here, and the remaining four split what is left.
- 45%Late-arriving aircraft
- 27%Carrier
- 27%National Airspace System
- 1%Extreme weather
45% of delay minutes trace back to a late-arriving aircraft, meaning the plane was already behind before it got here. Across 6,236 reported delay minutes here, that single category outweighs weather by 35 to one. The split is drawn from 6,236 reported delay minutes.
The practical consequence: the 5am–8am departure is the one that starts clean. Its aircraft has no earlier leg to be late from, which is exactly why that window shows 91.8% on time here.
Cancellations sit at 1.53% against a national 1.89%, which is ordinary. Diversions add another 0.00%.
Connections and stage length
What a delay here costs
Badly late arrivals are rare here: only 3.2% 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 672 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.
The return leg is a different operation and performs like one: it runs 78.3% on time across 785 flights, 4 points below this direction. Departure banks, aircraft rotations and the congestion at each end all differ, so scoring the two directions together would average away a real 4 points of difference.
One caution: this is a thin sample. 785 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 Alaska on OAK to SEA
Put together: treat all of this as provisional. 785 flights over twelve months is enough to clear this site's floor and not enough to be confident to better than a couple of points. The 81.9% headline is the most reliable number on the page; the hour and month splits below it are built on a few dozen flights each. 773 completed flights over 12 months sit behind that.
Related
Where to go next
- OAK to SEA, every carrier
- Alaska on SEA to OAK, the return leg
- Southwest Airlines on OAK to SEA73.8%
- Alaska Airlines network-wide record
- Oakland International (OAK) delay statistics
- Seattle-Tacoma International (SEA) delay statistics
- Why the first flight of the morning is statistically safest
- The best time of day to fly, according to 7.05 million flight records
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.