Round trip flights between Baltimore and San Diego for $137

Alaska Airlines and Expedia are offering round trip airfares between Baltimore (BWI) and San Diego (SAN) for $137. These fares include one stop in Seattle each way and are basic economy, allowing a personal item and a carry-on. The deal reflects a $50 price drop compared to two weeks ago and is available on specified dates from September through December 2026. To book, use Expedia or Alaska Airlines and select your preferred dates. These prices are subject to fluctuation based on travel dates and availability.