Likely delayed: there are delays at AS 634's airports as of 6:46 PM ET. It arrived on time 40% of the time in June-August 2026. When it was late, the average delay was 1h 2m. 1.1% of flights were cancelled. SFO has major delays (wind, max 5 hours and 41 minutes), so this flight is likely to be delayed.
Looks on time
Next leg LAS → SFO, scheduled 6:03 PM local time. No delays at LAS right now.
Cancellation risk: Medium 1.1% of its flights were cancelled in June-August 2026; SFO has major delays.
Estimate from the schedule, live position and airport conditions, if this flight operates today. Check Alaska Airlines for official times.
Before you fly
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Route and schedule
| Leg | Scheduled | On time |
|---|---|---|
| LAS → SFO Las Vegas, NV to San Francisco, CA | 6:03 PM → 7:41 PM | 40% |
Local times. Schedules change; check your booking.
How reliable is AS 634?
| Arrived on time (within 15 min) | 40% |
| Average delay when late | 62 min |
| Cancelled | 1.1% |
| Diverted | 0% |
| Flights tracked | 91 |
Best and worst days to fly AS 634
AS 634 was most reliable on Fridays (58% on time) and least reliable on Mondays (14%).
| Monday | |
| Tuesday | |
| Wednesday | |
| Thursday | |
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| Sunday |
Why it runs late
| Late-arriving plane | |
| Airline (crew, maintenance) | |
| Air traffic system | |
| Extreme weather |
Share of delay minutes by cause, as reported by Alaska Airlines to the Department of Transportation.
Other flights LAS → SFO
All flights on this route, ranked
Live status at its airports
We show airport-wide airport status, not this flight's gate or live position. For that, check the Alaska Airlines app.
Alaska Airlines delays and what you're owed · Airline phone numbers
About this data
On-time history: U.S. Bureau of Transportation Statistics, Reporting Carrier On-Time Performance, June-August 2026. Live conditions: live airport status. "On time" means arriving within 15 minutes of schedule.
Common questions
Is AS 634 delayed today?
SFO has major delays (wind, max 5 hours and 41 minutes), so this flight is likely to be delayed. Checked 6:46 PM ET. For this flight's gate and exact status, check the Alaska Airlines app.
Is AS 634 usually on time?
AS 634 arrived within 15 minutes of schedule 40% of the time in June-August 2026, with an average delay of 62 minutes when late.
How often is AS 634 cancelled?
1.1% of AS 634 flights were cancelled in June-August 2026.