Seattle to San Diego in September 2026

Dated one-way fares from Seattle to San Diego in September 2026. Use the calendar to see which days are cheaper.

Lowest this month $105

Highest this month $144

Sample fare $81

Airports SEA–SAN

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September 2026 price calendar

From $105 · up to $144

Mon

Tue

Wed

Thu

Fri

Sat

Sun

2 $144 3 $124 4 $124 5 $124 6 $124 7 $124 8 $124 9 $124 10 $124 11 $124 12 $124 13 $124 14 $124 15 $124 16 $124 17 $124 18 $124 19 $124 20 $124 21 $124 22 $124 23 $124 24 $124 25 $124 26 $124 27 $105

San Diego SAN

$81

Oct 13, 7:30am · 2h 55m · 0 stops

SEA → SAN · Southwest Airlines

This page is only September 2026 on the Seattle to San Diego route. Open the full route if you want the next months side by side.

Prices move as seats sell. Confirm the live itinerary before you book Seattle to San Diego in September 2026.