Cheap flights from Seattle to Chicago

One-way fares from $121 · SEA → CHI · prices found by travellers in the last 48 hours

Compare all dates Chicago → Seattle
Cheapest fare
$121

Alaska Airlines · Sun, Dec 13

Cheapest month
December

from $121

Direct flights
Yes

Alaska Airlines

Flight time
3h 57m

2,790 km

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Cheapest month to fly from Seattle to Chicago

Lowest one-way fare per person in each month. Choose a month to see every date.

  1. November 2026 $190
  2. December 2026 Cheapest $121
  3. July 2027 $236

Cheapest dates in December 2026

The lowest fares we've seen for each day, cheapest first.

Alaska Airlines
Depart11:35 Sun, Dec 13SEA → ORD 4h 14m · Direct
$121one way, per person
View deal
Frontier Airlines
Depart18:25 Tue, Dec 22SEA → ORD 6h 25m · 1 stop
$123one way, per person
View deal
See every date in December 2026 →

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Things to do

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Getting around

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About flights from Seattle to Chicago

Seattle (SEA) and Chicago (CHI) are about 2,790 km apart. Direct flights take around 3h 57m, and recent direct fares were with Alaska Airlines. Over the next few months, one-way fares start from $121, and December 2026 is currently the cheapest month to fly.

These prices come from searches travellers made in the last 48 hours, so they move quickly. If you see a good fare, it's worth booking soon. FlightsExp is free to use: you book directly with our travel partner.

Frequently asked questions

How much is a flight from Seattle to Chicago?

The cheapest one-way fare we've seen recently is $121 with Alaska Airlines, departing Sunday, December 13, 2026. Over the coming months, the lowest fare in each month ranges from $121 to $236.

What is the cheapest month to fly from Seattle to Chicago?

December 2026 currently has the lowest fares, from $121 one way.

Are there direct flights from Seattle to Chicago?

Yes. Recent direct fares were with Alaska Airlines.

How long is the flight from Seattle to Chicago?

A direct flight takes about 3h 57m. Seattle and Chicago are around 2,790 km apart.

Which airlines fly from Seattle to Chicago?

Recent fares on this route were with Frontier Airlines and Alaska Airlines.

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