Quickest 7h 35min
There are 3 flights 4 buses1 train company operating 2 routes - Pacific Surfliner, Sunset Limited from SAT to TIJ. The cheapest train costs $247 and is 1d 5h 57min.
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There are 4 ways to travel from SAT to TIJ. 3 flights, 4 buses, 1 train and 1 by car are possible between the two areas. The by car from SAT to TIJ is the cheapest. The flight from SAT to TIJ is the fastest. The train operated by Amtrak running from SAS to SAN is the most convenient.
It's important to check each mode when booking your ticket so that you can find the best method for you. The cost of each type varies differently, so be sure to use Faretrotter to keep an eye out!