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Alaska Airlines / SAN → SJC

AS 3429 on time

Alaska Airlines 3429: San Diego to San Jose at 12:59 p.m.; San Jose to San Diego at 3:15 p.m. (past 12 months). Figures below the title are for SAN → SJC, its busiest leg

On time
73%
175 flights · likely 66–79%
Cancelled
2.3%
of scheduled flights
Typical arrival
−7 min
median vs schedule
When late
+64 min
average delay
Similar flights
74%
AS, same route & hour

About 1 in 4 AS 3429 flights from San Diego arrived 15+ minutes late, diverted or cancelled over the past year (27%); 2.3% were cancelled. The typical flight landed 7 minutes early.

AS 3429: SAN → SJC

Scheduled to leave San Diego at 12:59 p.m. local time, operated by SkyWest as OO 3429. Over the past year it arrived on time 73% of the time (175 flights), in line with other AS flights on the route at that hour (74%). Last seen in the data Aug 18, 2026.

Month by month

40%70%100%Sep 2025: 76% on time (17 flights)76SepOct 2025: 79% on time (29 flights)79OctNov 2025: 77% on time (30 flights)77NovDec 2025: too few flights (11 flights)DecJan 2026: too few flights (4 flights)JanFeb 2026: too few flights (2 flights)FebMar 2026: too few flights (12 flights)MarApr 2026: 78% on time (23 flights)78AprMay 2026: too few flights (7 flights)MayJun 2026: too few flights (12 flights)JunJul 2026: 50% on time (18 flights)50JulAug 2026: too few flights (10 flights)Aug

By day of week

DayFlightsOn time
Monday3569%
Tuesday2774%
Wednesday15—
Thursday3482%
Friday3259%
Saturday13—
Sunday19—

Why it was late

Air traffic & airport (NAS) 41%Late inbound plane 39%Airline (crew, maintenance, ops) 17%Severe weather 3%

All flights SAN → SJC · Connecting off AS 3429? Check the risk

AS 3429: SJC → SAN

Scheduled to leave San Jose at 3:15 p.m. local time, operated by SkyWest as OO 3429. Over the past year it arrived on time 62% of the time (153 flights), worse than other AS flights on the route at that hour (76%). Last seen in the data Aug 18, 2026.

Month by month

20%60%100%Sep 2025: 71% on time (17 flights)71SepOct 2025: too few flights (10 flights)OctNov 2025: 66% on time (29 flights)66NovDec 2025: too few flights (11 flights)DecJan 2026: too few flights (4 flights)JanFeb 2026: too few flights (2 flights)FebMar 2026: too few flights (10 flights)MarApr 2026: 74% on time (23 flights)74AprMay 2026: too few flights (7 flights)MayJun 2026: too few flights (12 flights)JunJul 2026: 33% on time (18 flights)33JulAug 2026: too few flights (10 flights)Aug

By day of week

DayFlightsOn time
Monday3367%
Tuesday2383%
Wednesday11—
Thursday3063%
Friday2934%
Saturday10—
Sunday17—

Why it was late

Air traffic & airport (NAS) 55%Late inbound plane 36%Airline (crew, maintenance, ops) 7%Severe weather 2%

All flights SJC → SAN · Connecting off AS 3429? Check the risk

Questions

How often is AS 3429 from SAN to SJC late?

Alaska Airlines 3429 from San Diego, CA to San Jose, CA arrived 15 or more minutes late, was diverted or was cancelled on 27% of 175 scheduled flights between September 2025 and August 2026. 2.3% were cancelled.

How often is AS 3429 from SJC to SAN late?

Alaska Airlines 3429 from San Jose, CA to San Diego, CA arrived 15 or more minutes late, was diverted or was cancelled on 38% of 153 scheduled flights between September 2025 and August 2026. 2.6% 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.