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Not ready to book? to track prices.Find the cheapest flights from Chicago to Seattle
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United Airlines flights from Chicago to Seattle
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Alaska Airlines flights from Chicago to Seattle
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How to get the cheapest flight ticket from Chicago to Seattle
Look no further. We've gone through all the searches for this route on momondo so you have the important information and insights to find the cheapest flight ticket for your trip
What is the typical price of a round-trip flight between Chicago and Seattle?
What is the cheapest month to fly to Seattle?
The cheapest month to fly to Seattle from Chicago is in February. Flight prices, which tend to average around £157, are often lower during this time because this is during the off-season. The month of September is another great option to travel to Seattle, with average flight prices from Chicago averaging around £167.
What is the cheapest day to depart on your flight to Seattle?
According to our data, Friday is the cheapest day to fly to Seattle from Chicago. The lowest ticket price found for a Friday departure recently was £215. 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 Saturday as prices are generally higher than usual. According to our data, the average ticket price to Seattle on Saturday is £485.
What is the cheapest time of day to depart on your flight to Seattle?
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 £215. 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 £349.
What is the cheapest Chicago to Seattle/Tacoma Intl flight route?
Fly from Chicago O'Hare Intl to Seattle/Tacoma Intl for the best Chicago - Seattle/Tacoma Intl flight prices
How far in advance should I book a flight to Seattle?
You are more likely to see cheaper flights to Seattle from Chicago when booking 10 weeks ahead of your departure date. In general, you can expect to find flights to Seattle for around £209 when searching 10 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 £180 on momondo.
What cabin class options are available on Chicago to Seattle/Tacoma Intl flights?
There are 4 cabin classes available to choose from on Chicago to Seattle/Tacoma Intl flights. Cabin price and availability will vary by airline so perform a search above to find the right deals for you.
How many flights depart from Chicago to Seattle on average per day?
As of June 2025, there are 53 flights per day flying from Chicago to Seattle. The most common time of day flights depart is 17:00, with 35% of flights taking off at midday.
How many flights depart from Chicago to Seattle on average per week?
As of June 2025, there are 373 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.
When to book flights from Chicago to Seattle
Cheap Chicago to Seattle (CHI to SEA) flight deals and tips
Find info about flight duration, direct flights, and airports for your flight from Chicago to Seattle
How far is Chicago to Seattle/Tacoma Intl by plane?
The straight-line distance from Chicago to Seattle/Tacoma Intl is 1732.3 mi. By plane, this route typically takes 4h 27m.
When did momondo last update prices for flights from Chicago to Seattle/Tacoma Intl Airport?
Prices for flights from Chicago to Seattle/Tacoma Intl Airport refresh daily.
How old do you have to be to fly from Chicago to Seattle/Tacoma Intl Airport?
The minimum age for a child to fly alone is five, but airlines offering an unaccompanied minor (UNMR) service may have their age restrictions, such as regulations concerning flight duration, timing, and layovers. It is recommended that you verify with the airline you are booking with for travel from Chicago to Seattle/Tacoma Intl Airport.
What documentation or ID do you need to fly to Seattle/Tacoma Intl Airport?
The travel and health documents required for your trip to Seattle/Tacoma Intl Airport can vary based on your itinerary and personal situation. As a rule, consider having multiple documents such as a national ID card or driver’s license, and a passport valid for six-months after you plan to arrive at Seattle/Tacoma Intl Airport. We always recommend checking with your airline or a trusted third party such as IATA to get advice.
What is the most popular plane model from Chicago to Seattle?
Based on momondo bookings for this flight route, the most popular plane model on flight routes from Chicago to Seattle is Boeing 737-900 Passenger/BBJ3 (winglets) (19.52% of total bookings). The next most popular plane models are Boeing 737-800 (13.88%), Boeing 737-800 Passenger/BBJ2 (winglets) (13.69%), and Boeing 737 MAX 8 (10.21%).
Travelling to a place near Seattle?
Book flights to Seattle if you plan to visit one of these locationsWhy use momondo?
Why should I use momondo to find a flight deal from Chicago to Seattle?
We help find the flight that best suits your needs, momondo compares prices from hundreds of airlines and travel agents and helps you filter them to find the best flight from Chicago to Seattle for you.
Can I find flights from Chicago to Seattle with flexible booking policies on momondo?
Yes. All flights to Seattle from Chicago on momondo can be compared and filtered by various policies on offer, including flexible booking.
How can momondo help me find flights from Chicago to Seattle?
Once you have performed a search for Chicago to Seattle flights, momondo helps you find the right one by offering useful filters to narrow down your flight selection. Flights can be filtered by multiple factors such as airline, airport and price; but also by other criteria like aircraft type and payment method.
I’m not ready to book a flight from Chicago to Seattle right now. Can momondo alert me if prices change?
Of course. momondo tracks the price of Chicago to Seattle flights. All you need is a valid email address and we will do the rest; it is that quick and easy.