San Diego to Washington in September 2026

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

Lowest this month $139

Highest this month $175

Sample fare $139

Airports SAN–IAD

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September 2026 price calendar

From $139 · up to $175

Mon

Tue

Wed

Thu

Fri

Sat

Sun

1 $170 2 $167 3 $167 4 $167 5 $167 6 $167 7 $167 8 $167 9 $167 10 $167 11 $167 12 $167 13 $167 14 $167 15 $167 16 $167 17 $167 18 $163 19 $139 20 $175 21 $165 22 $165 23 $165 24 $165 25 $156

Washington WAS

$139

Sep 19, 5:54pm · 9h 26m · 1 stop

SAN → IAD · Frontier Airlines

Washington WAS

$156

Sep 25, 6:25am · 7h 34m · 1 stop

SAN → DCA · Frontier Airlines

Washington WAS

$163

Sep 18, 6:25am · 7h 34m · 1 stop

SAN → DCA · Frontier Airlines

This page is only September 2026 on the San Diego to Washington 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 San Diego to Washington in September 2026.