About 1 in 3 AS 42 flights from San Francisco arrived 15+ minutes late, diverted or cancelled over the past year (37%); 2.1% were cancelled. The typical flight landed 3 minutes late.
AS 42: SFO → JFK
Scheduled to leave San Francisco at 1:38 p.m. local time. Over the past year it arrived on time 63% of the time (238 flights), better than other AS flights on the route at that hour (58%). Last seen in the data Aug 31, 2026.
Usually Alaska Airlines's last flight of the day from San Francisco to New York (55% of days). Alaska Airlines's last SFO–JFK flight was cancelled 1.8% of the time, against 2.4% for its earlier ones. If it's cancelled, the next Alaska Airlines flight is usually around 7:20 a.m. the next morning.
Month by month
By day of week
| Day | Flights | On time |
|---|---|---|
| Monday | 35 | 54% |
| Tuesday | 33 | 73% |
| Wednesday | 34 | 74% |
| Thursday | 33 | 67% |
| Friday | 34 | 62% |
| Saturday | 34 | 71% |
| Sunday | 35 | 46% |
Why it was late
All flights SFO → JFK · Connecting off AS 42? Check the risk
Questions
How often is AS 42 from SFO to JFK late?
Alaska Airlines 42 from San Francisco, CA to New York, NY arrived 15 or more minutes late, was diverted or was cancelled on 37% of 238 scheduled flights between September 2025 and August 2026. 2.1% were cancelled.
Flight numbers change. Figures cover flights with this airline, number and route only. "Likely range" is the 95% interval for the true on-time rate given the number of flights. This is history, not live status: check Alaska Airlines for today's flight. Method.