Cheap flights from Seattle to Chicago from $143

The month of January is another great option to travel to Chicago O'Hare Intl Airport, with average flight prices from Seattle averaging around $252.

The cheapest day to depart on your flight to Chicago O'Hare Intl Airport is on a Wednesday when prices can be found for as low as $423. This is often the case because there is less demand to fly during this day of the week. On the other hand, Monday is the most expensive day to depart from Seattle because it is more convenient for both business and leisure travelers. As a result, prices tend to be around $521.

Flying to Chicago O'Hare Intl Airport from Seattle in the afternoon is the least expensive time of day to depart. momondo users have found prices as low as $368 when looking at flights departing in the afternoon. Try not to purchase tickets in the morning because they tend to be around $464. Of course, these prices can vary depending on the time of year and what airport you fly to.

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

You are more likely to see cheaper flights to Chicago O'Hare Intl Airport from Seattle when booking weeks ahead of your departure date. In general, you can expect to find flights to Chicago O'Hare Intl Airport for around $341 when searching weeks out. However, flight prices might be lower outside of this timeframe. For example, people recently found flights to Chicago O'Hare Intl Airport from Seattle for as low as $315 on momondo.

There are 4 cabin classes available to choose from on Seattle to Chicago O'Hare Intl Airport 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 35% on your flight if you consider stops on a Seattle to Chicago O'Hare Intl Airport flight.

As of August 2026, prices for Seattle to Chicago O'Hare Intl Airport flights are approximately 15% cheaper when compared to flights at the same time last year.

Alaska Airlines, Delta, and United Airlines are the most popular carriers operating from Seattle/Tacoma Intl to Chicago O'Hare Intl

Alaska Airlines, Delta and American Airlines are the top three most popular airlines that fly to Chicago O'Hare Intl Airport from Seattle according to our data. Alaska Airlines is the first choice among our users, with 32% of people opting to fly with this airline when traveling to Chicago O'Hare Intl Airport. Keep in mind that there are 5 different airlines that fly to Chicago O'Hare Intl Airport on a routine basis, so you have a few additional options to choose from.

As of August 2026, 41 flights take off from Seattle and land in Chicago O'Hare Intl Airport each day. The most common flight departure time for this route is 10:00AM, with 56% of daily flights taking off at noon.

The number of flights available between Seattle and Chicago O'Hare Intl Airport is 287 per week as of August 2026. The most frequent departure day is Fri, with 22% of weekly flights leaving on this day.