Round Trip Seattle - San Diego Airfares for $147

Alaska Airlines, Southwest Airlines, and Expedia have round trip nonstop fares between Seattle (SEA) and San Diego (SAN) for $147. These are basic economy fares that include a personal item and a carry-on, with no seat selection or changes allowed. Travel dates are available from September through November 2026, with multiple departure options. To book, use Expedia, Alaska Airlines, or Southwest Airlines with your preferred dates. This deal offers a savings of about $37 from the estimated full price of $184, making it a significant low-cost option for flexible travelers. The deal's wide availability and the low price make this an attractive option for travelers headed to San Diego or Seattle within the specified months.