Cheap Flights From San Diego (SAN) | 2026 Deals, Routes & Tips

Finding Cheap Flights From San Diego

San Diego is served by San Diego International Airport (SAN), the busiest single-runway commercial airport in the United States and a major gateway for Southern California. It offers an extensive domestic network with strong connections to the West Coast, Southwest, and major hubs across the country, supported by intense competition from both network and low-cost carriers.

The airport provides excellent connectivity to California cities, the Pacific Northwest, Texas, the Midwest, and the East Coast. Key destinations include San Francisco (SFO), Los Angeles (LAX), Seattle (SEA), Denver (DEN), Dallas (DFW), Chicago (ORD), and New York (JFK). It also offers a growing number of international flights to Mexico, Canada, and seasonal service to Europe and Japan.

San Diego International is a focus city for Southwest Airlines and Alaska Airlines. It is served by all major U.S. carriers (American, Delta, United, JetBlue) and low-cost carriers Frontier and Spirit. International carriers like British Airways, Japan Airlines, and Aeroméxico operate from SAN. This high level of competition helps keep fares in check.

To secure cheap flights from San Diego, book domestic flights 3-6 weeks in advance. For international travel, book 2-5 months ahead. Use flight comparison tools and set price alerts. Flying on weekdays (Tuesday-Thursday) is significantly cheaper. SAN is known for competitive fares to the Bay Area, Pacific Northwest, and Texas. For the best deals, check Southwest and Alaska for West Coast value, and Frontier/Spirit for low base fares (plus fees). British Airways and Japan Airlines occasionally have good deals on long-haul routes.