Cheap flights from Chicago to Seattle from $126 MDW, ORD, RFD → SEA

Found recently, and the cheapest we hold

It is also the cheapest return we hold, of any age.

What have prices looked like?

Over 44 days, 24 Sept to 11 Nov, the cheapest return we saw each day was $178 to $477.

Those were the prices on those days, not today's.

Could nearby dates be cheaper?

We hold no other 4-night return fares leaving within 3 days of 3 Dec to compare.

Every date we hold

6 fares on 3 departure dates

Which month looks cheapest?

December 2026 is the cheapest month — from $240.

Found recently, and the cheapest we hold

It is also the cheapest one-way we hold, of any age.

What have prices looked like?

Over 27 days, 24 Sept to 11 Nov, the cheapest one-way we saw each day was $121 to $261.

27 days is a short history, so treat this range as an early guide.

Those were the prices on those days, not today's.

Could nearby dates be cheaper?

We hold no other one-way fares leaving within 3 days of 2 Dec to compare.

Every date we hold

5 fares on 3 departure dates

Return

Fares 14 to 29 days before departure were typically 59% lower than 0 to 6 days before departure.

From the cheapest return each day between 24 Sept and 11 Nov (44 days), grouped by how many days ahead the flight left; one adult in economy.

Each range covers different departure dates, so this compares typical fares, not the same trip priced twice.

Prices reflect recent searches — current fares may differ.

One-way

The cheapest fares were 90 to 179 days before departure.

From the cheapest one-way each day between 24 Sept and 11 Nov (27 days), grouped by how many days ahead the flight left; one adult in economy.

Each range covers different departure dates, so this compares typical fares, not the same trip priced twice.

Prices reflect recent searches — current fares may differ.

How much is a return flight from Chicago to Seattle?

The cheapest return found recently is $240 with Alaska Airlines, 3 Dec to 7 Dec, found 2 days ago. The cheapest return fare on each of 3 departure dates is usually $264 to $350.

How much is a one-way flight from Chicago to Seattle?

The cheapest one-way found recently is $126 with Alaska Airlines, 2 Dec, found 2 days ago. The cheapest one-way fare on each of 3 departure dates is usually $130 to $162.

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

December 2026 is the cheapest month for a return, from $240, 3 Dec to 7 Dec, found 2 days ago.

How far ahead should I book a flight from Chicago to Seattle?

In 44 days of prices between 24 Sept and 11 Nov, return fares 14 to 29 days before departure were typically 59% lower than 0 to 6 days before departure. In 27 days of prices between 24 Sept and 11 Nov, one-way fares were cheapest 90 to 179 days before departure.

Is there a direct flight from Chicago to Seattle?

Yes, the cheapest nonstop return found recently is $240 with Alaska Airlines, 3 Dec to 7 Dec, found 2 days ago. The cheapest nonstop one-way found recently is $128 with Southwest Airlines, 2 Dec, found 2 days ago.

How long is the flight from Chicago to Seattle?

The cheapest nonstop one-way found recently, with Southwest Airlines on 2 Dec, takes 4 h 50 min from Chicago Midway International Airport (MDW) to Seattle-Tacoma International Airport (SEA).

Which airlines have the cheapest flights from Chicago to Seattle?

Between 15 Nov and 29 Dec, Alaska Airlines has the cheapest return on 2 of the 3 departure dates we hold, and American Airlines on 1. Between 2 Dec and 13 Dec, Alaska Airlines has the cheapest one-way on 1 of the 3 departure dates we hold, Southwest Airlines on 1 and Allegiant Air on 1.