Flight number record
AS 629
Alaska Airlines · Las Vegas to Seattle
- Route
- LAS → SEA
- Departs
- 10:28
- Flights
- 353
- Period
- September 2025 to August 2026
Historical statistics for September 2025 to August 2026, not live status. For today’s AS 629, check with Alaska Airlines.
AS 629 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 11 points better than the national rate of 77.3%. When something does go wrong the average delay runs close to two hours. That rests on 353 flights, with a median arrival 10 minutes early.
Set against the rest of the country, AS 629's record is 11 points better than the US average of 77.3%. That gap is worth roughly 110 fewer late arrivals for every thousand flights.
Key figures
On time
88.3%
Arrivals under 15 minutes late, of 351 completed flights
Avg delay
100 min
Across delayed arrivals only, not all flights
Cancelled
0.57%
National rate is 1.89%
1 hour+ late
5.1%
National rate is 8.3%
These figures cover 353 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 629 flies
AS 629 flies LAS to SEA without a single fixed slot. Its most common scheduled departure was 10:28, used on 70 of 353 flights.
- Departs 10:2870 flights19.8%
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 10:28 departure sits in the 8am–11am window. Across every US flight scheduled in that window the on-time rate is 83.9%, and AS 629 runs 4 points better at 88.3%. 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 629 next to LAS to SEA
Every carrier on LAS to SEA combined arrived on time 82.1% of the time across 5,617 flights, so AS 629 is 6 points ahead of it. Alaska flew 2,610 flights on the same city pair under all its flight numbers, including this one, and those ran 83.2% on time. Across its whole network Alaska Airlines managed 79.7%, which this flight beats by 9 points.
| Compared with | Flights | On time | Avg delay | Cancelled | Grade |
|---|---|---|---|---|---|
| AS 629thin sample | 353 | 88.3% | 100 min | 0.57% | A+ |
| All Alaska Airlines on LAS–SEA | 2,610 | 83.2% | 66 min | 1.19% | B |
| All carriers on LAS–SEA | 5,617 | 82.1% | 64 min | 1.00% | B |
| Alaska Airlines, whole network | 309,844 | 79.7% | 52 min | 1.20% | B |
Across the year
AS 629 quarter by quarter
AS 629 did not run the same all year. Its best quarter was Jul–Sep 2025 at 93.3% on time and its weakest Oct–Dec 2025 at 83.1%, a swing of 10 points on roughly 71 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 202530 flights93.3%
- Oct–Dec 202590 flights83.1%
- Jan–Mar 202680 flights91.1%
- Apr–Jun 202691 flights92.3%
- Jul–Sep 202662 flights83.9%
Scale runs 75% to 100%.
By weekday, AS 629 ranged from 83.0% on Monday to 94.2% on Thursday. With about 50 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.
Arrival by arrival
How late AS 629 runs when it is late
AS 629 often beats the schedule: 133 of 351 completed flights, 38%, arrived 15 minutes or more early. The 41 late arrivals split 19 under half an hour, 4 between 30 and 60 minutes, and 18 an hour or more.
- 15+ min early133 flights37.9%
- Within 15 min177 flights50.4%
- 15–29 min late19 flights5.4%
- 30–59 min late4 flights1.1%
- 1–2 hours late7 flights2.0%
- 2+ hours late11 flights3.1%
Scale runs 0% to 100%.
Share of 351 completed flights by arrival against schedule.
A late pushback is often recovered here: of 68 departures that left 15 minutes late or more, 31 still arrived on time. Only 4 left on time and still arrived late.
The worst days
Worst days for AS 629
The latest arrival of the period was on 7 October 2025, 9 hours 5 minutes behind schedule; most of its delay minutes were filed as carrier-caused (crew, maintenance, fuelling, baggage). The same cause led on four of the five worst days.
| Date | Arrived late by | Largest filed cause |
|---|---|---|
| 7 October 2025 | 9 hours 5 minutes | Carrier |
| 11 November 2025 | 7 hours 4 minutes | Carrier |
| 13 July 2026 | 6 hours 13 minutes | Carrier |
| 21 November 2025 | 5 hours 32 minutes | Late-arriving aircraft |
| 25 February 2026 | 4 hours 5 minutes | Carrier |
Delay causes
Why AS 629 runs late
Carrier accounts for 53% of the 4,105 delay minutes carriers reported here, and the remaining four split what is left.
- 53%Carrier
- 36%Late-arriving aircraft
- 6%National Airspace System
- 4%Extreme weather
- 0%Security
36% of delay minutes trace back to a late-arriving aircraft, meaning the plane was already behind before it got here. Across 4,105 reported delay minutes here, that single category outweighs weather by 9 to one. The split is drawn from 4,105 delay minutes reported on AS 629.
Cancellations are rare at 0.57%, 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
5.1% of arrivals land an hour or more late, close to the national 8.3%, so a 60 to 75 minute layover is reasonable here while anything under 45 minutes is a bet. Most delays on this route last close to two hours, which a normal layover absorbs.
The 867 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 353 flights under AS 629 in the data flew LAS 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. 353 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 629
For a booking, AS 629 has one of the better records a US domestic flight can show: 88.3% on time and 0.57% cancelled. That is a base rate, not a promise about any single day.
Related
Where to go next
- LAS to SEA, every carrier and departure
- SEA to LAS, the return direction
- Delta Air Lines 2844 on the same route94.7%
- Alaska Airlines 676 on the same route77.1%
- Alaska Airlines 479 on the same route84.4%
- Delta Air Lines 2880 on the same route84.5%
- Alaska Airlines 552 on the same route81.5%
- Alaska Airlines 701 on the same route95.5%
- Harry Reid International (LAS) 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.