San Diego International Airport (SAN) is one of the few major US airports with no direct rail link into the city — there's no train station in the terminal, no light rail spur, nothing. For most visitors travelling light, the honest best option is the public MTS 992 bus, which drops you straight at downtown's trolley hub in a few minutes flat; for anyone with more luggage or a late arrival, rideshare and taxis are simpler and only a little pricier, since the airport sits barely 5 km from downtown.
The MTS 992 bus: cheap, direct, a little basic
Route 992, run by San Diego's MTS (Metropolitan Transit System), stops right outside every terminal and runs straight into downtown, calling at Santa Fe Depot / America Plaza — the hub for the trolley network and for Amtrak and Coaster trains — before continuing on to the Old Town Transit Center. Buses run frequently through the day, at a standard MTS fare well below any car option, paid with San Diego's PRONTO card or app, or by tapping a contactless bank card directly at the reader.
It's a genuinely direct route with no interchange required to reach downtown, but it is an ordinary city bus rather than an airport shuttle — luggage racks are limited, and a large suitcase can be awkward to manage standing on a busier run. For a single bag or a backpack, it's hard to beat on price and simplicity.
Connecting onward: the trolley network
From Santa Fe Depot or America Plaza, the Blue Line trolley runs south towards the border crossing at San Ysidro/Tijuana and north through Old Town and Mission Valley, while the Orange Line heads east through the Gaslamp Quarter and East Village. The same PRONTO fare and validity window generally covers a transfer from the 992 bus onto a trolley, so if your hotel sits along one of these lines rather than in the immediate downtown core, the whole airport-to-hotel journey can be done on one card without ever queuing for a taxi.
Rideshare and taxis
Uber and Lyft pick up from a dedicated curbside zone at each terminal, usually a short, clearly signed walk from baggage claim, and taxis wait at a marked rank nearby — see our guide to ride-hailing apps around the world if you're new to using them in the US. Given how close the airport sits to downtown, journey times are typically only 10–20 minutes, though traffic on the connecting surface streets can stretch that during the evening rush. Fares cost more than the 992 bus, unsurprisingly, but the door-to-door convenience makes rideshare or a taxi the practical default for anyone with real luggage, a group splitting the fare, or a flight landing late at night.
The rental car shuttle
All the major rental agencies operate from a consolidated Rental Car Center a short distance from the terminals, reached by a free shuttle bus rather than the trolley or a rideshare trip. Picking up a car here makes sense if your plans stretch beyond the city itself — the coast road up towards La Jolla and Del Mar, a day trip to the border at Tijuana, or the wider drive north along the coast covered in our guide to driving in the USA. Downtown San Diego itself is compact and walkable enough that most visitors are better off without a car for the first day or two.
Why there's no train
It's a fair question, given how close the runway sits to the skyline. Unlike San Francisco, where BART runs directly into the international terminal (see our San Francisco airport guide for that comparison), San Diego's trolley network was never extended into SAN's terminals, and a direct rail connection has been discussed for years without materialising. The 992 bus exists precisely to bridge that gap — a short, frequent, purpose-built hop to the nearest trolley stop rather than a genuine rail link, which is about as close as the city currently gets.
Which option should you choose?
Travelling light and watching the budget, the 992 bus to the trolley is hard to beat — cheap, direct and frequent. With bags, a group, or a late landing, rideshare or a taxi is the simpler, only modestly pricier choice for a genuinely short ride. If your trip includes exploring the coast or crossing into Mexico, picking up a car at the Rental Car Center on arrival saves a second trip out to collect one later. For onward travel, our guide to Los Angeles to San Diego covers the Amtrak Pacific Surfliner north along the coast — a service that also calls at Santa Fe Depot, the same downtown hub the 992 bus reaches — and our wider look at the USA by train puts it in context.
Frequently asked questions
Is there a train from San Diego airport to downtown?
No — San Diego International Airport has no direct rail or trolley connection. The closest equivalent is the MTS 992 bus, which runs from the terminals to the downtown trolley hub at Santa Fe Depot in a few minutes.
What's the cheapest way from SAN to downtown?
The MTS 992 bus, paid with a PRONTO card, the PRONTO app, or a tapped contactless bank card. It's a standard city bus fare, well below the cost of a taxi or rideshare for the same short trip.
How do I pay for the MTS bus from the airport?
Tap a contactless bank card directly at the reader when boarding, or use the PRONTO card or app, San Diego's regional transit payment system, which also covers onward transfers to the trolley network.
How far is San Diego airport from downtown?
Only around 5 km, one of the shortest airport-to-downtown distances of any major US city — which keeps even a rideshare or taxi journey to typically 10–20 minutes outside heavy traffic.
Sources and further reading:
- Ground transport information: San Diego International Airport (SAN) official site.
- Bus and trolley routes, fares and PRONTO: San Diego MTS (Metropolitan Transit System).