Roundtrip Nonstop San Francisco to San Diego Flights

No special codes or coupons are required. This deal for roundtrip nonstop flights between San Francisco and San Diego is available through March 4, 2026. This offer works both ways from either city on Southwest Airlines, United Airlines, and Expedia.

Limited availability:

• Departs SFO: Oct 22-31; Nov 1-6, 9-20, 24; Dec 2-4, 6-18, 30-31; Jan 1, 5-8, 12-15, 19-22, 26-29; Feb 2-5, 9-12, 17-19, 23-26; March 2-4
• Departs SAN: Oct 22-25, 27-31; Nov 1, 4-20, 24-25; Dec 2-18, 22-25; Jan 5-8, 12-15, 20-22, 26-29; Feb 2-5, 9-12, 17-19, 24-25; March 2-4

These are basic economy fares. On United, you may have a personal item, and travelers with children will be seated together. On Southwest, you may have a personal item and a carry-on bag.