Cheap flights from Chicago to Seattle from £109

The cheapest month to fly to Seattle from Chicago is in January. Flight prices, which tend to average around £165, are often lower during this time because this is during the off-season. The month of February is another great option to travel to Seattle, with average flight prices from Chicago averaging around £177.

According to our data, Thursday is the cheapest day to fly to Seattle from Chicago. The lowest ticket price found for a Thursday departure recently was £191. Keep in mind that prices can always vary depending on your route and whether or not you are flying domestic or international. Be sure to avoid booking your departure on a Wednesday as prices are generally higher than usual. According to our data, the average ticket price to Seattle on Wednesday is £966.

According to our data, the cheapest time of day to fly to Seattle is in the evening. momondo users have found flights departing from Chicago to Seattle in the evening for as low as £218. Keep in mind that these prices may fluctuate based on what airline you choose and the time of year you plan to travel. Flights in the afternoon are often more expensive, with an average ticket price of £311.

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 £245 when searching weeks before you fly. However, flight prices might be lower outside of this timeframe. For example, people recently found flights to Seattle from Chicago for as low as £235 on momondo.

There are 2 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.

As of September 2026, there are 37 flights per day flying from Chicago to Seattle. The most common time of day flights depart is 18:00, with 49% of flights taking off in the evening.

As of September 2026, there are 262 flights per week flying from Chicago to Seattle. The most common day of the week flights depart is Fri, with 19% of flights taking off on this day.