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$92+ 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 10/17. Fares are subject to change and may not be available on all flights or dates of travel.
SEA — CHI
Oct 17 — Oct 241
Fri 10/17
Fri 10/24
1 adult, Economy
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Cheapflights Tip: The best prices from Seattle/Tacoma Intl to Chicago are usually found in January or February, booked 84 days in advance, depart on a Wednesday or Thursday 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 September 17, 2025.

Round-trip from

$190
(Booking.com)

One-way from

$92
(Frontier)

Popular in

December

Cheapest in

January

Average price

$290

Good round-trip deal

$268 or less

Good one-way deal

$167 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. 5% potential increase in price ($15 potential increase over avg. RT price).
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Cheapest flight prices on average. 2% potential price decrease ($9 potential savings vs. average RT price).
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Average for round-trip flights in September 2025
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Price to beat on a round-trip flight from Seattle/Tacoma Intl to Chicago (CHI).
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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 September 17, 2025.

This Kiwi.com deal was found by Cheapflights users on 9/16. 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.
Fri 10/316:15 pmSEA - ORD
Nonstop4h 09mMultiple Airlines
Fri 11/76:00 amORD - SEA
1 stop8h 13mMultiple Airlines
Deal found 9/16$190
This Kiwi.com deal was found by Cheapflights users on 9/14. 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.
Sat 10/252:43 pmSEA - ORD
Nonstop4h 07mHawaiian Airlines
Fri 10/318:00 amORD - SEA
Nonstop4h 44mHawaiian Airlines
Deal found 9/14$191
This Mytrip deal was found by Cheapflights users on 9/16. 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 Mytrip is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 10/2410:16 amSEA - MDW
1 stop11h 04mFrontier
Sun 10/266:24 pmMDW - SEA
1 stop19h 43mFrontier
Deal found 9/16$191
This Delta deal was found by Cheapflights users on 9/16. 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.
Wed 12/35:55 pmSEA - ORD
Nonstop4h 04mDelta
Fri 12/55:03 pmORD - SEA
1 stop7h 11mDelta
Deal found 9/16$192
This Kiwi.com deal was found by Cheapflights users on 9/14. 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.
Sat 10/255:55 pmSEA - ORD
Nonstop4h 11mAlaska Airlines
Fri 10/319:20 amORD - SEA
1 stop9h 45mAlaska Airlines
Deal found 9/14$193
This Southwest deal was found by Cheapflights users on 9/17. 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 10/255:45 amSEA - MDW
Nonstop4h 00mSouthwest
Fri 10/319:05 amMDW - SEA
Nonstop4h 35mSouthwest
Deal found 9/17$194
This American Airlines deal was found by Cheapflights users on 9/16. 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 American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 10/2510:39 amSEA - ORD
Nonstop4h 21mAmerican Airlines
Fri 10/3111:05 amORD - SEA
Nonstop4h 41mAmerican Airlines
Deal found 9/16$195
This Kiwi.com deal was found by Cheapflights users on 9/14. 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.
Fri 10/2412:17 amSEA - ORD
Nonstop4h 07mMultiple Airlines
Fri 10/316:00 amORD - SEA
Nonstop4h 40mMultiple Airlines
Deal found 9/14$196
This Kiwi.com deal was found by Cheapflights users on 9/15. 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 10/2112:17 amSEA - ORD
Nonstop4h 07mMultiple Airlines
Mon 11/36:00 amORD - SEA
1 stop9h 03mMultiple Airlines
Deal found 9/15$197
This Booking.com deal was found by Cheapflights users on 9/16. 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 Booking.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 10/26:12 amSEA - ORD
1 stop25h 25mFrontier
Wed 10/297:20 amORD - SEA
1 stop6h 53mFrontier
Deal found 9/16$198
This Kiwi.com deal was found by Cheapflights users on 9/15. 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.
Mon 10/612:17 amSEA - ORD
Nonstop4h 07mMultiple Airlines
Wed 10/87:15 amORD - SEA
1 stop6h 52mMultiple Airlines
Deal found 9/15$199
This Kiwi.com deal was found by Cheapflights users on 9/15. 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.
Wed 10/225:50 pmSEA - ORD
Nonstop4h 09mMultiple Airlines
Thu 10/236:50 amORD - SEA
1 stop7h 17mMultiple Airlines
Deal found 9/15$200

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 September 17, 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

Thu 11/27

10:53 am-5:06 pm

Nonstop4h 13m

Chicago O'Hare Intl

Wed 12/3

8:00 am-10:52 am

Nonstop4h 52m

$194

SeattleChicago

SEA - ORD

SEAORD

Seattle/Tacoma Intl

Tue 1/6

6:00 am-12:13 pm

Nonstop4h 13m

Chicago O'Hare Intl

Tue 1/20

7:45 am-10:36 am

Nonstop4h 51m

$194

SeattleChicago

SEA - ORD

SEAORD

Seattle/Tacoma Intl

Tue 3/10

11:00 pm-5:04 am

Nonstop4h 04m

Chicago O'Hare Intl

Wed 3/11

7:45 am-10:36 am

Nonstop4h 51m

$203

SeattleChicago

SEA - ORD

SEAORD

Seattle/Tacoma Intl

Tue 3/10

11:00 pm-5:04 am

Nonstop4h 04m

Chicago O'Hare Intl

Wed 3/11

7:45 am-10:36 am

Nonstop4h 51m

$203

SeattleChicago

SEA - ORD

SEAORD

Seattle/Tacoma Intl

Tue 12/16

5:50 pm-11:59 pm

Nonstop4h 09m

Chicago O'Hare Intl

Wed 1/14

6:50 pm-9:41 pm

Nonstop4h 51m

$209

SeattleChicago

SEA - ORD

SEAORD

Seattle/Tacoma Intl

Wed 10/15

4:47 pm-10:47 pm

Nonstop4h 00m

Chicago O'Hare Intl

Sun 10/19

5:01 am-9:59 am

1 stop6h 58m

$216

SeattleChicago

SEA - MDW

SEAMDW

Seattle/Tacoma Intl

Fri 12/5

5:15 am-4:20 pm

1 stop9h 05m

Chicago Midway

Sun 12/7

5:25 pm-8:00 pm

Nonstop4h 35m

$216

SeattleChicago

SEA - ORD

SEAORD

Seattle/Tacoma Intl

Wed 12/31

8:30 am-2:41 pm

Nonstop4h 11m

Chicago O'Hare Intl

Mon 1/5

6:00 am-8:45 am

Nonstop4h 45m

$218

SeattleChicago

SEA - ORD

SEAORD

Seattle/Tacoma Intl

Mon 11/24

6:00 am-12:03 pm

Nonstop4h 03m

Chicago O'Hare Intl

Thu 12/4

5:51 pm-8:35 pm

Nonstop4h 44m

$218

SeattleChicago

SEA - ORD

SEAORD

Seattle/Tacoma Intl

Wed 10/15

5:50 pm-11:59 pm

Nonstop4h 09m

Chicago O'Hare Intl

Wed 10/22

8:20 am-3:08 pm

1 stop8h 48m

$219

Flights are sorted by cheapest round-trip flights first.

Deals found on 9/15

Showing 1-10 of 55 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
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
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 September 12, 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 September 17, 2025.

It’s typically best to fly out from Seattle to Chicago in the afternoon. Doing so could potentially save you 37% 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 September 14, 2025.

Travelers seeking maximum savings on their Seattle to Chicago flight should consider departing on Saturday afternoons when fares are most often at their lowest. Monday 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 September 17, 2025.

The most flights from SEA to CHI are scheduled on a Monday (71 on average). You will have fewer flight options on Saturday, which is when the least amount of flights are scheduled (54 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 September 17, 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

Crew

8.5

Food

7.1

Boarding

8.1

Entertainment

7.1

Overall

8.0

Comfort

7.8

Reviews

1 / 20
8.0
Excellent

Anonymous,Sep 2025

SEA - MKE

The crew were excellent, flight good, but the actual space for a person to occupy for 4 hours seems to get smaller and smaller 🤣. I am not overweight, and average height….very uncomfortable,, especially when I couldn’t recliner the seat at all, and the pocket in front doesn’t accommodate a water bottle.
Alaska Airlines
8.0
Very good
10,000 reviews
Alaska Airlines
8.0
Very good
10,000 reviews

Crew

8.5

Food

7.1

Boarding

8.1

Entertainment

7.1

Overall

8.0

Comfort

7.8

Reviews

1 / 20
8.0
Excellent

Anonymous,Sep 2025

SEA - MKE

The crew were excellent, flight good, but the actual space for a person to occupy for 4 hours seems to get smaller and smaller 🤣. I am not overweight, and average height….very uncomfortable,, especially when I couldn’t recliner the seat at all, and the pocket in front doesn’t accommodate a water bottle.
Southwest
8.0
Very good
4,242 reviews
Alaska Airlines
8.0
Very good
10,000 reviews

Crew

8.5

Food

7.1

Boarding

8.1

Entertainment

7.1

Overall

8.0

Comfort

7.8

Reviews

1 / 20
8.0
Excellent

Anonymous,Sep 2025

SEA - MKE

The crew were excellent, flight good, but the actual space for a person to occupy for 4 hours seems to get smaller and smaller 🤣. I am not overweight, and average height….very uncomfortable,, especially when I couldn’t recliner the seat at all, and the pocket in front doesn’t accommodate a water bottle.
Delta
8.0
Very good
7,961 reviews
Alaska Airlines
8.0
Very good
10,000 reviews

Crew

8.5

Food

7.1

Boarding

8.1

Entertainment

7.1

Overall

8.0

Comfort

7.8

Reviews

1 / 20
8.0
Excellent

Anonymous,Sep 2025

SEA - MKE

The crew were excellent, flight good, but the actual space for a person to occupy for 4 hours seems to get smaller and smaller 🤣. I am not overweight, and average height….very uncomfortable,, especially when I couldn’t recliner the seat at all, and the pocket in front doesn’t accommodate a water bottle.
United Airlines
7.4
Good
8,926 reviews
Alaska Airlines
8.0
Very good
10,000 reviews

Crew

8.5

Food

7.1

Boarding

8.1

Entertainment

7.1

Overall

8.0

Comfort

7.8

Reviews

1 / 20
8.0
Excellent

Anonymous,Sep 2025

SEA - MKE

The crew were excellent, flight good, but the actual space for a person to occupy for 4 hours seems to get smaller and smaller 🤣. I am not overweight, and average height….very uncomfortable,, especially when I couldn’t recliner the seat at all, and the pocket in front doesn’t accommodate a water bottle.
American Airlines
7.2
Good
10,000 reviews
Alaska Airlines
8.0
Very good
10,000 reviews

Crew

8.5

Food

7.1

Boarding

8.1

Entertainment

7.1

Overall

8.0

Comfort

7.8

Reviews

1 / 20
8.0
Excellent

Anonymous,Sep 2025

SEA - MKE

The crew were excellent, flight good, but the actual space for a person to occupy for 4 hours seems to get smaller and smaller 🤣. I am not overweight, and average height….very uncomfortable,, especially when I couldn’t recliner the seat at all, and the pocket in front doesn’t accommodate a water bottle.

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 61 outbound flights to Chicago per day. 8 airlines have flights to Chicago from Seattle/Tacoma Intl on a regular basis.

  • How long is the flight from Seattle to Chicago?

    Departing from Seattle to Chicago will take you 4h 04m. Seattle and Chicago are separated by a distance of 1715 mi. Both multi-stop and nonstop flights can be found to your destination and back.

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

    Our cheapest airline available from Seattle to Chicago is Spirit Airlines. Our recent data shows that you can find tickets from as low as $107 on this airline. Additional options worth looking into are Delta and Hawaiian Airlines, starting at $119 and $121 round-trip. Users have found that Spirit Airlines is 63% 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 Southwest, which is currently one of the cheapest options available, starting at $99. Alaska Airlines flights start at $105 while deals on United Airlines start at $105 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 WestJet (100%), KLM (100%) or Avianca (92%) 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 $791, our data indicates the cheapest price to be $103. The most popular route (Seattle/Tacoma Intl - Chicago O'Hare Intl), is priced around $155.

  • 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
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 September 17, 2025.
AirlineCheapestAverageFlexibilityOn-time
Spirit AirlinesCheapest$107Average$189FlexibilityNo cancel feeOn-time65%
DeltaCheapest$119Average$292FlexibilityNo cancel feeOn-timeN/A
Hawaiian AirlinesCheapest$121Average$288FlexibilityNo cancel feeOn-time85%
FrontierCheapest$137Average$271FlexibilityNo cancel feeOn-time62%
United AirlinesCheapest$169Average$353FlexibilityNo cancel feeOn-time69%
Alaska AirlinesCheapest$171Average$330FlexibilityNo cancel feeOn-time75%
American AirlinesCheapest$177Average$326FlexibilityNo cancel feeOn-time71%
SouthwestCheapest$184Average$384FlexibilityNo cancel feeOn-time63%

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