Terminal 1 is 18 km away from Terminal 2, and it takes about 18 minutes. You can get to Concourse from Terminal 1 or 2 by taking a shuttle train.
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For passengers entering to Korea from another country, there is no automatic transfer. You must claim your baggage and check it in again for your next flight.
While T1 is used for domestic flights by low cost carriers, T2 is used for all international flights as well as domestic flights for full service carriers like Air India, Jet Airways and Vistara.
Domestic Terminals 1, 2, and 3 are connected to each other and you can easily walk between them or take moving sidewalks and escalators. The walk from Terminal 1 to Terminal 2 takes about 10 minutes, and from Terminal 1 to Terminal 3 can take up to 20 minutes if you're walking from farthest gate to farthest gate.
An enclosed walkway connects the Departures Level of Terminal 1 with the Arrivals Level of Terminal 2. Once you pass through security in both terminals, you are within a common departures area, and you can freely walk between the shopping areas and boarding gates across both terminals.
Pedestrian walkways connect Terminal 1 and Terminal 2 at San Diego International Airport. Pedestrian bridges and crosswalks connect the passenger terminals to transportation islands and adjacent parking lots in front of the terminals.
You'll need to clear customs and immigration. Next, you'll recheck your luggage for the domestic flight. Finally, you'll need to go through Transportation Security Administration screening. This may include a physical inspection of your luggage and personal items with a metal detector or a full-body scan.