That's the lowest price we could find for select routes by at least $9. Buy Now at DealBase Tips On the DealBase landing page, click "Delta Airlines" in the top line to see this sale. We found this price on flights departing from San Diego, CA (SAN) with arrival in Seattle, WA (SEA) on January 30 and return on February 6. All prices, dates, and booking details were valid at the time of publication. Book this travel deal by January 13 for travel from January 28 through March 30.