$134 Cheap Southwest Airlines flights Baltimore (BWI) to San Diego (SAN)

Use the "Price (lowest to highest)" filter on Expedia to look for cheap Southwest Airlines return flights from $272 from BWI to SAN. Affordable one-way options from $134 are available too.**These prices were available on Expedia within the past 7 days, for flights departing within the next year. Prices and availability are subject to change. Additional terms apply.

To find cheap Southwest Airlines fares from Baltimore Washington Intl. Thurgood Marshall Airport (BWI) to San Diego Intl. Airport (SAN), start searching one to three months before your intended departure. Reserving domestic flights 34 to 86 days in advance could save you 25% compared to booking just 6 to 12 days ahead. The day you book can also impact how much you pay. Sunday is usually the most affordable, while Monday is often the most expensive for domestic flights. You can save 6% on average by booking your flight on a Sunday.**Ideal booking window recommendation is based on average round-trip ticket prices for January through November for 2024. Best day of the week to book recommendation is based on average round-trip ticket prices for January through October 2024. All data sourced from ARC's global airline sales database.

Departing BWI at 8:45AM UTC-5, the first Southwest Airlines flight to SAN arrives at 11:50AM UTC-8. Flying early means you'll be less likely to experience cancellations.* Prefer to travel later? The last Southwest Airlines flight from BWI to SAN departs at 7:20PM UTC-5 and touches down at 10:15PM UTC-8.*Most reliable time of the day recommendation is based on January through August 2024 flight status data sourced from OAG's global flight data platform.