San Diego to Denver in September 2026

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

Lowest this month $47

Highest this month $171

Sample fare $47

Airports SAN–DEN

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September 2026 price calendar

From $47 · up to $171

Mon

Tue

Wed

Thu

Fri

Sat

Sun

2 $171 3 $109 4 $109 5 $109 6 $109 7 $109 8 $109 9 $109 10 $109 11 $109 12 $109 13 $109 14 $109 15 $109 16 $109 17 $109 18 $109 19 $109 20 $109 21 $109 22 $109 23 $109 24 $109 25 $47

Denver DEN

$47

Sep 25, 4:54pm · 2h 28m · 0 stops

SAN → DEN · Frontier Airlines

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