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$97+ Cheap flights from Seattle (SEA) to Chicago (CHI)

This is the cheapest one-way flight price found by a Cheapflights user in the last 72 hours by searching for a flight departing on 10/29. Fares are subject to change and may not be available on all flights or dates of travel.
SEA — CHI
Aug 2 — Aug 91
Sat 8/2
Sat 8/9
1 adult, Economy
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Cheapflights Tip: The best prices from Seattle/Tacoma Intl to Chicago are usually found in January or September, booked 84 days in advance, depart on a Wednesday or Friday and return on a Wednesday

Cheap flight deals from Seattle to Chicago

Discover tips and strategies to find the most affordable flight options for your journey from Seattle (SEA) to Chicago (CHI). Learn about various techniques such as flexible date searches, comparing prices across and setting up price alerts. Use these methods to find the cheapest flights available for your travel needs. Data last updated July 28, 2025.

Round-trip from

$175
(Kiwi.com)

One-way from

$98
(CheapOair)

Popular in

December

Cheapest in

January

Average price

$333

Good round-trip deal

$241 or less

Good one-way deal

$165 or less
From Seattle/Tacoma Intl to Chicago (CHI)
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One-way flight from Seattle/Tacoma Intl to Chicago (CHI)
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Highest demand for flights based on searches. 4% potential increase in price ($13 potential increase over avg. RT price).
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Cheapest flight prices on average. 2% potential price decrease ($8 potential savings vs. average RT price).
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Average for round-trip flights in July 2025
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Price to beat on a round-trip flight from Seattle/Tacoma Intl to Chicago (CHI).
Search Deals
Price to beat on a one-way flight from Seattle/Tacoma Intl to Chicago (CHI).
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Find flight deals from Seattle to Chicago

Cheapest flights from Seattle to Chicago
Explore the most affordable flight options available from Seattle to Chicago. Find the lowest fares from popular airlines and budget airlines, with prices last updated on July 28, 2025.

This Kiwi.com deal was found by Cheapflights users on 7/27. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 9/93:59 pmSEA - ORD
Nonstop4h 08mHawaiian Airlines
Tue 9/166:20 amORD - SEA
Nonstop4h 32mHawaiian Airlines
Deal found 7/27$175
This Delta deal was found by Cheapflights users on 7/27. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 8/305:50 pmSEA - ORD
Nonstop4h 01mDelta
Sun 8/317:15 amORD - SEA
Nonstop4h 30mDelta
Deal found 7/27$179
This iWofly deal was found by Cheapflights users on 7/26. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure iWofly is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 9/95:55 pmSEA - ORD
Nonstop4h 08mMultiple Airlines
Tue 9/165:45 pmORD - SEA
Nonstop4h 32mMultiple Airlines
Deal found 7/26$181
This Alaska Airlines deal was found by Cheapflights users on 7/28. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Alaska Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 8/2512:59 amSEA - ORD
Nonstop4h 04mAlaska Airlines
Tue 8/2610:00 amORD - SEA
Nonstop4h 34mAlaska Airlines
Deal found 7/28$183
This Southwest deal was found by Cheapflights users on 7/28. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 8/3011:10 pmSEA - MDW
Nonstop4h 05mSouthwest
Sat 9/65:25 pmMDW - SEA
Nonstop4h 30mSouthwest
Deal found 7/28$184
This Southwest deal was found by Cheapflights users on 7/28. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 8/271:40 pmSEA - ORD
1 stop8h 00mSouthwest
Wed 9/36:15 amORD - SEA
1 stop7h 30mSouthwest
Deal found 7/28$208
This United Airlines deal was found by Cheapflights users on 7/26. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 8/267:34 pmSEA - ORD
1 stop7h 49mUnited Airlines
Sat 8/307:35 pmORD - SEA
Nonstop4h 45mUnited Airlines
Deal found 7/26$215
This Frontier deal was found by Cheapflights users on 7/27. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Frontier is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 8/2312:40 pmSEA - ORD
1 stop8h 59mFrontier
Sat 8/307:00 amORD - SEA
1 stop6h 45mFrontier
Deal found 7/27$238
This Frontier deal was found by Cheapflights users on 7/27. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Frontier is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 8/146:25 amSEA - MDW
1 stop12h 29mFrontier
Sat 8/162:44 pmMDW - SEA
1 stop10h 58mFrontier
Deal found 7/27$248

Cheapflights Fare Finder

 
Customize your flight search to find flights from Seattle to Chicago that fit within your specific budget. Explore options based on user searches and filter the results based on your desired price range. Find flights that match your budget for a cost-effective journey. Over the last 7 days, Cheapflights users made 2,558,603 searches. Data last updated July 28, 2025.
Use the filters below to find and compare flights from Seattle to Chicago that are best for you.

Fly from

Seattle

Fly to

Chicago

Route

Depart

Return

Price

SeattleChicago

SEA - ORD

SEAORD

Seattle/Tacoma Intl

Tue 9/9

3:59 pm-10:07 pm

Nonstop4h 08m

Chicago O'Hare Intl

Tue 9/16

6:20 am-8:52 am

Nonstop4h 32m

$175

SeattleChicago

SEA - ORD

SEAORD

Seattle/Tacoma Intl

Sat 8/30

5:50 pm-11:51 pm

Nonstop4h 01m

Chicago O'Hare Intl

Sun 8/31

7:15 am-9:45 am

Nonstop4h 30m

$179

SeattleChicago

SEA - ORD

SEAORD

Seattle/Tacoma Intl

Tue 9/9

5:55 pm-12:03 am

Nonstop4h 08m

Chicago O'Hare Intl

Tue 9/16

5:45 pm-8:17 pm

Nonstop4h 32m

$181

SeattleChicago

SEA - ORD

SEAORD

Seattle/Tacoma Intl

Mon 8/25

12:59 am-7:03 am

Nonstop4h 04m

Chicago O'Hare Intl

Tue 8/26

10:00 am-12:34 pm

Nonstop4h 34m

$183

SeattleChicago

SEA - MDW

SEAMDW

Seattle/Tacoma Intl

Sat 8/30

11:10 pm-5:15 am

Nonstop4h 05m

Chicago Midway

Sat 9/6

5:25 pm-7:55 pm

Nonstop4h 30m

$184

SeattleChicago

SEA - ORD

SEAORD

Seattle/Tacoma Intl

Wed 8/27

1:40 pm-11:40 pm

1 stop8h 00m

Chicago O'Hare Intl

Wed 9/3

6:15 am-11:45 am

1 stop7h 30m

$208

SeattleChicago

SEA - ORD

SEAORD

Seattle/Tacoma Intl

Tue 8/26

7:34 pm-5:23 am

1 stop7h 49m

Chicago O'Hare Intl

Sat 8/30

7:35 pm-10:20 pm

Nonstop4h 45m

$215

SeattleChicago

SEA - ORD

SEAORD

Seattle/Tacoma Intl

Fri 8/8

5:30 pm-6:03 am

1 stop10h 33m

Chicago O'Hare Intl

Mon 8/11

7:08 am-4:25 pm

1 stop11h 17m

$231

SeattleChicago

SEA - ORD

SEAORD

Seattle/Tacoma Intl

Sat 8/23

12:40 pm-11:39 pm

1 stop8h 59m

Chicago O'Hare Intl

Sat 8/30

7:00 am-11:45 am

1 stop6h 45m

$238

SeattleChicago

SEA - MDW

SEAMDW

Seattle/Tacoma Intl

Thu 8/14

6:25 am-8:54 pm

1 stop12h 29m

Chicago Midway

Sat 8/16

2:44 pm-11:42 pm

1 stop10h 58m

$248

Flights are sorted by cheapest round-trip flights first.

Deals found on 7/27

Showing 1-10 of 25 results
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The best insider tips for Seattle to Chicago flights

Snippets provided in this section are AI-generated based on a summarization of Cheapflights-commissioned articles. The articles are presented as-is, for general informational purposes only, and may not be up-to-date. The opinions contained in the articles are original to the author and reflect their authentic experience, which may vary significantly from the experience of others.
Cheapflights partnered with top experts to bring you the best recommendations for your Seattle to Chicago trip
Airlines
Alaska Airlines

Alaska's Premium Class offers extra legroom and free cocktails, enhancing comfort on medium-haul flights.


Alaska Airlines Wi-Fi is a flat fee, ideal for business travelers needing connectivity during flights.

Read more about Alaska Airlinesby Robert Schrader
United Airlines

United's Economy Plus offers extra legroom, enhancing comfort on domestic routes.


United's Polaris Lounges provide exclusive amenities for premium passengers, enhancing the travel experience.

Read more about United Airlinesby Harriet Baskas
Southwest

Southwest offers two free checked bags, a generous policy for domestic travelers.


Southwest's Early Bird check-in ensures priority boarding, ideal for securing preferred seats.

Read more about Southwestby Marisa Garcia
Airports
SEA

Use SEA Spot Saver to book security screening appointments in advance, reducing wait times. Sign up online a few days before your flight.

Read more about SEAby Brandon Schultz
ORD

For a quick city transfer, take the “L” train from ORD to downtown Chicago, avoiding traffic delays common with taxis or rideshares.

Read more about ORDby Ramsey Qubein
Our travel experts
Robert Schrader

Robert Schrader

Expert on Alaska Airlines

Robert Schrader

Robert Schrader

One of the web's original travel bloggers, Robert launched his first site Leave Your Daily Hell in 2009. Since then, he's expanded into destination niche sites (one each for Japan, Thailand and Taiwan), in addition to having written for the inflight magazines of Singapore Airlines and Korean Air. Overall, he's visited nearly 100 countries, and flies business as often as possible.

Read more
Harriet Baskas

Harriet Baskas

Expert on United Airlines

Harriet Baskas

Harriet Baskas

Harriet is an award-winning journalist who is happiest in an airport or an unusual museum. Her stories about airports, air travel, and the business of travel have appeared on NBC News, CNBC, USA TODAY, The Points Guy and other outlets. She is the creator of the StuckatTheAirport.com blog and the author of nine books. When not out on the road or exploring the latest airport amenities, she’s home in Seattle getting ready for the next adventure.

Read more
Marisa Garcia

Marisa Garcia

Expert on Southwest

Marisa Garcia

Marisa Garcia

Marisa knows planes inside and out, spending 16 years working on aircraft in hangars at airports around the world. She is an aviation industry expert, specialized in airline interiors and regulations. Ten years ago, she pivoted to journalism. She shares her insights in leading aviation, travel, and business publications and on her site FlightChic.

Read more
Ramsey Qubein

Ramsey Qubein

Expert on ORD

Ramsey Qubein

Ramsey Qubein

An avid traveler and aviation expert who has visited 173 countries, all 50 states and seven continents, Ramsey Qubein flies nearly 400,000 miles a year. As a North Carolina-based freelance journalist for publications including Conde Nast Traveler, Forbes, USA Today and Bloomberg among others, he explores the latest trends in aviation, hospitality, cruises and business.

Read more
Brandon Schultz

Brandon Schultz

Expert on SEA

Brandon Schultz

Brandon Schultz

Brandon Schultz is an award-winning food and travel writer based in New York City. His work has appeared in Forbes, AAA, Thrillist, Travel + Leisure, and The Daily Meal, among many others, and he is the author of 6 books, including 3 cookbooks.

Read more

Best time to book a flight from Seattle to Chicago

Have a flexible travel schedule? Discover the best time to fly to Chicago from Seattle with our price prediction graph.
Estimated round-trip price
Rates are based on past data. Find the cheapest month and day to book your flight based on your travel requirements, then search for cheap deals.

Cheapflights Insights

Everything you need to know about your flight from Seattle to Chicago

How far ahead should I book a flight from Seattle to Chicago?

Use this chart to determine the optimal time to book a round-trip flight from Seattle to Chicago. Price data was last updated on July 25, 2025.

The price you pay for your flight from Seattle to Chicago may vary depending on when you book. For the best chance of a lower fare, look to book 84 days in advance of your trip. Fares are likely to increase a fortnight or so before your departure date.

What is the cheapest month to book a flight from Seattle to Chicago?

Currently, August is the cheapest month in which you can book a flight from Seattle to Chicago (average of $245). Flying from Seattle to Chicago in March is currently the most expensive (average of $321). There are several factors that can impact the price of a flight, so comparing airlines, departure airports and flight times can provide users with more options.

What is the cheapest time of day to fly from SEA to CHI?

Find hourly flight availability from Seattle to Chicago. Discover flight options and departure times throughout the day, allowing you to choose a departure time that suits your schedule. Data last updated July 28, 2025.

It’s typically best to fly out from Seattle to Chicago in the afternoon. Doing so could potentially save you 38% on the flight price compared to flying in the morning, which is usually more expensive.

What is the cheapest day to fly from Seattle to Chicago?

Use this chart to determine the cheapest time to fly round-trip from Seattle to Chicago. Price data was last updated on July 27, 2025.

Travelers seeking maximum savings on their Seattle to Chicago flight should consider departing on Wednesday afternoons when fares are most often at their lowest. Sunday at noon flights should be avoided if possible as fares are typically the most expensive at this time.

Weekly flight availability from Seattle to Chicago

Explore weekly flight availability from Seattle to Chicago. Discover flights operating on different days of the week, giving you the flexibility to choose a travel day that best fits your plans. Compare info to find the most convenient option for your journey. Data last updated July 28, 2025.

The most flights from SEA to CHI are scheduled on a Monday (84 on average). You will have fewer flight options on Saturday, which is when the least amount of flights are scheduled (59 on average).

Reviews of airlines servicing Chicago

Get insights into the airlines that provide service to Chicago. Read reviews, discover amenities, and learn about the overall travel experience offered by airlines. Use this information to make informed decisions when choosing an airline for your flight to Chicago. Reviews last updated July 28, 2025.
Get a feel of what it's like to fly with Alaska Airlines, Southwest, and Delta from Seattle to Chicago by reading reviews from past customers. Users have also rated airlines in terms of entertainment options, comfort, food, crew/service, and boarding process.
Alaska Airlines
8.0
Very good
10,000 reviews

Entertainment

7.1

Comfort

7.8

Boarding

8.1

Overall

8.0

Crew

8.5

Food

7.1

Reviews

1 / 20
10.0
Excellent

Jonathan,Jul 2025

SEA - BOS

Fantastic Check-in with easy baggage drop. While it took a while to find out which was the gate, the boarding was a dream, the stewards were simply incredible and the flight fantastic.
Alaska Airlines
8.0
Very good
10,000 reviews
Alaska Airlines
8.0
Very good
10,000 reviews

Entertainment

7.1

Comfort

7.8

Boarding

8.1

Overall

8.0

Crew

8.5

Food

7.1

Reviews

1 / 20
10.0
Excellent

Jonathan,Jul 2025

SEA - BOS

Fantastic Check-in with easy baggage drop. While it took a while to find out which was the gate, the boarding was a dream, the stewards were simply incredible and the flight fantastic.
Southwest
8.0
Very good
4,237 reviews
Alaska Airlines
8.0
Very good
10,000 reviews

Entertainment

7.1

Comfort

7.8

Boarding

8.1

Overall

8.0

Crew

8.5

Food

7.1

Reviews

1 / 20
10.0
Excellent

Jonathan,Jul 2025

SEA - BOS

Fantastic Check-in with easy baggage drop. While it took a while to find out which was the gate, the boarding was a dream, the stewards were simply incredible and the flight fantastic.
Delta
8.0
Very good
7,971 reviews
Alaska Airlines
8.0
Very good
10,000 reviews

Entertainment

7.1

Comfort

7.8

Boarding

8.1

Overall

8.0

Crew

8.5

Food

7.1

Reviews

1 / 20
10.0
Excellent

Jonathan,Jul 2025

SEA - BOS

Fantastic Check-in with easy baggage drop. While it took a while to find out which was the gate, the boarding was a dream, the stewards were simply incredible and the flight fantastic.
Hawaiian Airlines
7.8
Good
2,604 reviews
Alaska Airlines
8.0
Very good
10,000 reviews

Entertainment

7.1

Comfort

7.8

Boarding

8.1

Overall

8.0

Crew

8.5

Food

7.1

Reviews

1 / 20
10.0
Excellent

Jonathan,Jul 2025

SEA - BOS

Fantastic Check-in with easy baggage drop. While it took a while to find out which was the gate, the boarding was a dream, the stewards were simply incredible and the flight fantastic.
United Airlines
7.4
Good
8,893 reviews
Alaska Airlines
8.0
Very good
10,000 reviews

Entertainment

7.1

Comfort

7.8

Boarding

8.1

Overall

8.0

Crew

8.5

Food

7.1

Reviews

1 / 20
10.0
Excellent

Jonathan,Jul 2025

SEA - BOS

Fantastic Check-in with easy baggage drop. While it took a while to find out which was the gate, the boarding was a dream, the stewards were simply incredible and the flight fantastic.

Related info for your journey

Find useful and relevant information for your journey from Seattle to Chicago. Access travel guides, tips, and recommendations to enhance your travel experience. Get information about local attractions, weather, transportation options, and more.

  • What airport do you fly from for flights from Seattle to Chicago?

    For a flight from Seattle to Chicago, you will be flying from Seattle/Tacoma Intl. Seattle/Tacoma Intl (SEA) is just 11.4 mi from the center of the city. Seattle/Tacoma Intl is the only Seattle airport and it handles 71 outbound flights to Chicago per day. 8 airlines have flights to Chicago from Seattle/Tacoma Intl on a regular basis.

  • What are the cheapest airlines flying from Seattle to Chicago round-trip?

    Our cheapest airline available from Seattle to Chicago is Hawaiian Airlines. Our recent data shows that you can find tickets from as low as $175 on this airline. Additional options worth looking into are Delta and Alaska Airlines, starting at $179 and $183 round-trip. Users have found that Hawaiian Airlines is 40% cheaper than the other options available to this destination.

  • What are the cheapest airlines to fly from Seattle to Chicago one-way?

    To fly one-way, consider booking your trip with Spirit Airlines, which is currently one of the cheapest options available, starting at $98. Frontier flights start at $99 while deals on United Airlines start at $100 one-way.

  • What are the most popular routes from Seattle to Chicago?

    While some choose either Seattle/Tacoma Intl - Chicago Midway or Seattle/Tacoma Intl - Chicago Greater Rockford, Seattle/Tacoma Intl - Chicago O'Hare Intl is the most popular route from Seattle to Chicago.

  • What are the most reliable airlines from Seattle to Chicago?

    No one likes to see their flight delayed. When booking a flight from Seattle to Chicago consider choosing Air France (100%), Austrian Airlines (91%) or Korean Air (85%) as they are the most reliable in getting you off to your destination on time.

  • What are the cheapest flights from Seattle to Chicago?

    Looking for the cheapest flight from Seattle to Chicago? While on average our users pay $922, our data indicates the cheapest price to be $119. The most popular route (Seattle/Tacoma Intl - Chicago O'Hare Intl), is priced around $159.

  • Can I find deals for flights from Seattle to Chicago that include hotel bookings?

    Yes. In addition to deals on Seattle to Chicago flights, Cheapflights offers vacation packages that include both flights and hotel.

  • How can I find direct flights from Seattle to Chicago?

    After entering your origin and destination, apply the non-stop filter on the search result page to find direct flights from Seattle to Chicago.

  • Can I find deals for business class flights from Seattle to Chicago?

    Yes. Cheapflights offers flight deals from Seattle to Chicago by cabin class. In addition to browsing deals, you can also filter by cabin class on the search results page after making a search.

  • What is the cheapest month to book a flight from Seattle to Chicago?

    Currently, August is the cheapest month in which you can book a flight from Seattle to Chicago (average of $245). Flying from Seattle to Chicago in March is currently the most expensive (average of $321). There are several factors that can impact the price of a flight, so comparing airlines, departure airports and flight times can provide users with more options.

See more FAQs

Traveling to a place near Chicago?

Book flights to Chicago if you plan to visit one of these locations
Merrillville
Lansing
Hammond
Benton Harbor
Porter
Valparaiso
Chesterton

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Alternative routes for Seattle to Chicago

See prices for flight routes from nearby airports that may be better suited for you.
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Top 8 airlines flying from Seattle to Chicago

Discover the top 8 airlines that operate flights from Seattle to Chicago. Compare their services, reliability, and customer satisfaction ratings to choose the airline that best suits your travel preferences and needs. Over the last 7 days, Cheapflights users made 2,558,603 searches. Data last updated July 28, 2025.
AirlineCheapestAverageFlexibilityOn-time
Spirit AirlinesCheapest$93Average$161FlexibilityNo cancel feeOn-time65%
DeltaCheapest$117Average$388FlexibilityNo cancel feeOn-timeN/A
Hawaiian AirlinesCheapest$121Average$289FlexibilityNo cancel feeOn-time85%
FrontierCheapest$137Average$276FlexibilityNo cancel feeOn-time62%
United AirlinesCheapest$160Average$346FlexibilityNo cancel feeOn-time69%
Alaska AirlinesCheapest$168Average$317FlexibilityNo cancel feeOn-time75%
American AirlinesCheapest$169Average$328FlexibilityNo cancel feeOn-time71%
SouthwestCheapest$179Average$387FlexibilityNo cancel feeOn-time63%

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