Delta Airlines via Kayak have airfares travelling to and from Seattle (SEA) and San Diego (SAN) for $ 49 one-way or $ 97 round trip, nonstop. These are basic economy fares, a restricted-type fare.

Travel Availability:

Departs SEA: Sept 15-16, 22-23, 26, 29-30; Oct 3, 6-7, 10, 13-14, 17, 20-21, 24, 27-28, 31; Nov 3-4, 7, 10-11, 14, 17-18; Dec 1-2, 5, 8-9, 12, 15-16
Departs SAN: Sept 15-16, 19, 22-23, 26, 29-30; Oct 3, 6-7, 10, 13-14, 17, 20-21, 24, 27-28, 31; Nov 3-4, 7, 10-11, 14, 17-18; Dec 1-2, 5, 8-9, 12, 15-16