Cheap flights from Chicago to Seattle from $148

In general, January is the cheapest month to fly from Chicago to Seattle. Due to it being the ‘off-season’ during this time, you can expect flight prices to be around $223. If you don’t want to visit Seattle in January, then you should wait until February to fly from Chicago, when ticket prices are also cheap, with an average price of $237.

On average, the least expensive day to fly to Seattle from Chicago is on a Friday. momondo users have found tickets for Friday departures for as low as $379. However, this price may fluctuate depending on the airline, the season, and holidays. On the other hand, Monday is the most expensive day to depart from Chicago because it is more convenient for both business and leisure travelers. As a result, prices tend to be around $460.

Flying to Seattle from Chicago in the evening is the least expensive time of day to depart. momondo users have found prices as low as $374 when looking at flights departing in the evening. Flights to Seattle are more costly in the afternoon, with an average ticket price of $415. Departure times in the afternoon fall within the peak daily travel times, which is why tickets can be more expensive.

Fly from Chicago O'Hare Intl to Seattle/Tacoma Intl for the best Chicago - Seattle/Tacoma Intl flight prices

You are more likely to see cheaper flights to Seattle from Chicago when booking weeks ahead of your departure date. In general, you can expect to find flights to Seattle for around $318 when searching weeks out. However, flight prices might be lower outside of this timeframe. For example, people recently found flights to Seattle from Chicago for as low as $304 on momondo.

There are 4 cabin classes available to choose from on Chicago to Seattle flights. Cabin price and availability will vary by airline so perform a search above to find the right deals for you.

You could potentially save up to 26% on your flight if you consider stops on a Chicago to Seattle flight.

As of August 2026, prices for Chicago to Seattle flights are approximately 42% more expensive when compared to flights at the same time last year.

Southwest, Frontier, and American Airlines are the most popular carriers operating from Chicago to Seattle/Tacoma Intl

Alaska Airlines, American Airlines and United Airlines are the top three most popular airlines that fly to Seattle from Chicago according to our data. Alaska Airlines is the first choice among our users, with 34% of people opting to fly with this airline when traveling to Seattle. Keep in mind that there are 7 different airlines that fly to Seattle on a routine basis, so you have a few additional options to choose from.

Portland (PDX) was the most common stop: 43% of momondo users choosing 1-stop flights on this route connected there.

Flights via Denver (DEN) offer the lowest average round-trip price of $284.

Flights connecting via Las Vegas (LAS) have the shortest average one-way travel time: 7h 25m.

Las Vegas (LAS) has the shortest average layover time for this route: 0h 58m.

The number of flights available between Chicago and Seattle is 36 per day as of August 2026. The most frequent departure time is 9:00PM, with 46% of daily flights leaving in the evening.

258 flights are operational weekly from Chicago to Seattle as of August 2026. The most popular departure day for this route is Fri, with 23% of flights per week taking off on this day.