Seattle to Chicago in September 2026

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

Lowest this month $125

Highest this month $178

Sample fare $125

Airports SEA–ORD

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September 2026 price calendar

From $125 · up to $178

Mon

Tue

Wed

Thu

Fri

Sat

Sun

2 $178 3 $164 4 $164 5 $164 6 $164 7 $164 8 $164 9 $164 10 $164 11 $164 12 $150 13 $176 14 $151 15 $151 16 $151 17 $151 18 $125

Chicago CHI

$125

Sep 18, 7:45pm · 7h 53m · 1 stop

SEA → ORD · Frontier Airlines

Chicago CHI

$150

Sep 12, 12:16am · 4h 4m · 0 stops

SEA → ORD · Alaska Airlines

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