Seattle to Phoenix in September 2026

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

Lowest this month $124

Highest this month $176

Sample fare $124

Airports SEA–PHX

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September 2026 price calendar

From $124 · up to $176

Mon

Tue

Wed

Thu

Fri

Sat

Sun

1 $143 2 $124 3 $139 4 $157 5 $157 6 $157 7 $176

Phoenix PHX

$124

Sep 02, 2:37pm · 17h 3m · 1 stop

SEA → PHX · Frontier Airlines

Phoenix PHX

$139

Sep 03, 4:33pm · 6h 51m · 1 stop

SEA → PHX · Frontier Airlines

Phoenix PHX

$143

Sep 01, 7:21am · 3h 3m · 0 stops

SEA → PHX · Alaska Airlines

This page is only September 2026 on the Seattle to Phoenix 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 Phoenix in September 2026.