Cheap flights from Chicago O'Hare Intl Airport to Seattle from $145

In general, January is the cheapest month to fly from Chicago O'Hare Intl Airport to Seattle. Due to it being the ‘off-season’ during this time, you can expect flight prices to be around $214. If you don’t want to visit Seattle in January, then you should wait until February to fly from Chicago O'Hare Intl Airport, when ticket prices are also cheap, with an average price of $236.

On average, the least expensive day to fly to Seattle from Chicago O'Hare Intl Airport is on a Friday. momondo users have found tickets for Friday departures for as low as $386. 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 O'Hare Intl Airport because it is more convenient for both business and leisure travelers. As a result, prices tend to be around $462.

Flying to Seattle from Chicago O'Hare Intl Airport in the evening is the least expensive time of day to depart. momondo users have found prices as low as $377 when looking at flights departing in the evening. Flights to Seattle are more costly in the afternoon, with an average ticket price of $422. 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 O'Hare Intl - Seattle/Tacoma Intl flight prices

You are more likely to see cheaper flights to Seattle from Chicago O'Hare Intl Airport when booking weeks ahead of your departure date. In general, you can expect to find flights to Seattle for around $327 when searching weeks out. However, flight prices might be lower outside of this timeframe. For example, people recently found flights to Seattle from Chicago O'Hare Intl Airport for as low as $315 on momondo.

There are 4 cabin classes available to choose from on Chicago O'Hare Intl Airport 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 38% on your flight if you consider stops on a Chicago O'Hare Intl Airport to Seattle flight.

As of September 2026, prices for Chicago O'Hare Intl Airport to Seattle flights are approximately 80% more expensive when compared to flights at the same time last year.

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

Alaska Airlines, United Airlines and American Airlines are the top three most popular airlines that fly to Seattle from Chicago O'Hare Intl Airport 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 5 different airlines that fly to Seattle on a routine basis, so you have a few additional options to choose from.

As of September 2026, 39 flights take off from Chicago O'Hare Intl Airport and land in Seattle each day. The most common flight departure time for this route is 6:00PM, with 49% of daily flights taking off in the evening.

277 flights are operational weekly from Chicago O'Hare Intl Airport to Seattle as of September 2026. The most popular departure day for this route is Fri, with 17% of flights per week taking off on this day.