What is the cheapest airline that flies from Chicago to Seattle/Tacoma Intl?

United Airlines, Delta, and Sun Country Air are the most popular carriers operating from Chicago to Seattle/Tacoma Intl

How many flights depart from Chicago to Seattle on average per week?

As of November 2026, 174 flights take off from Chicago and land in Seattle each week. The most common flight departure day for this route is Wed, with 24% of weekly flights taking off on this day.

How many flights depart from Chicago to Seattle on average per day?

The number of flights available between Chicago and Seattle is 24 per day as of November 2026. The most frequent departure time is 17:00, with 44% of daily flights leaving in the afternoon.

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 are refreshed on a daily basis.

How old do you have to be to fly from Chicago to Seattle/Tacoma Intl Airport?

The minimum age a child must be to fly alone is five but airlines that offer an unaccompanied minor (UNMR) service will have their own age restrictions, including rules around flight length, timings, and stopovers. We always recommend checking with the individual airline you are booking with to 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 licence, 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.

R2 406 Cheap Flights from Chicago to Seattle in 2026/27

Find the cheapest flights from Chicago to Seattle

Return

One-way

Last minute

Direct

Cheap return flights

Enter your travel dates to find the best prices.

6:49 - 14:36ORD Chicago O'Hare Intl-SEA Seattle/Tacoma Intl

9h 47m1 stop Atlanta Hartsfield-Jackson

17:59 - 23:59SEA Seattle/Tacoma Intl-ORD Chicago O'Hare Intl

4h 00mdirect

R4 400Delta

Wed, Dec 16 - Mon, Jan 18

6:40 - 9:30ORD Chicago O'Hare Intl-SEA Seattle/Tacoma Intl

4h 50mdirect

14:05 - 23:56SEA Seattle/Tacoma Intl-ORD Chicago O'Hare Intl

7h 51m1 stop Atlanta Hartsfield-Jackson

R4 482Delta

Wed, Nov 25 - Wed, Dec 2

20:59 - 23:53ORD Chicago O'Hare Intl-SEA Seattle/Tacoma Intl

4h 54mdirect

23:39 - 5:40SEA Seattle/Tacoma Intl-ORD Chicago O'Hare Intl

4h 01mdirect

R4 565Alaska Airlines

Wed, Dec 23 - Thu, Dec 24

14:13 - 20:56ORD Chicago O'Hare Intl-SEA Seattle/Tacoma Intl

8h 43m1 stop San Diego

23:40 - 5:37SEA Seattle/Tacoma Intl-ORD Chicago O'Hare Intl

3h 57mdirect

R4 631Alaska Airlines

Thu, Dec 10 - Thu, Dec 10

16:20 - 21:21ORD Chicago O'Hare Intl-SEA Seattle/Tacoma Intl

7h 01m1 stop Denver Intl

5:00 - 13:21SEA Seattle/Tacoma Intl-ORD Chicago O'Hare Intl

6h 21m1 stop Denver Intl

R4 647United Airlines

Tue, Dec 15 - Wed, Jan 6

13:30 - 20:56ORD Chicago O'Hare Intl-SEA Seattle/Tacoma Intl

9h 26m1 stop Washington, D.C. Dulles Intl

7:00 - 13:12SEA Seattle/Tacoma Intl-ORD Chicago O'Hare Intl

4h 12mdirect

R4 664United Airlines

Thu, Nov 26 - Tue, Jan 5

19:42 - 22:32ORD Chicago O'Hare Intl-SEA Seattle/Tacoma Intl

4h 50mdirect

23:44 - 5:58SEA Seattle/Tacoma Intl-ORD Chicago O'Hare Intl

4h 14mdirect

R4 680United Airlines

Tue, Dec 22 - Fri, Dec 25

17:48 - 23:15ORD Chicago O'Hare Intl-SEA Seattle/Tacoma Intl

7h 27m1 stop Denver Intl

22:56 - 5:06SEA Seattle/Tacoma Intl-ORD Chicago O'Hare Intl

4h 10mdirect

R4 730United Airlines

Wed, Nov 25 - Fri, Nov 27

19:42 - 22:32ORD Chicago O'Hare Intl-SEA Seattle/Tacoma Intl

4h 50mdirect

13:02 - 21:30SEA Seattle/Tacoma Intl-ORD Chicago O'Hare Intl

6h 28m1 stop Denver Intl

R4 763United Airlines

Tue, Dec 22 - Fri, Dec 25

15:00 - 20:47ORD Chicago O'Hare Intl-SEA Seattle/Tacoma Intl

7h 47m1 stop San Francisco

16:04 - 23:59SEA Seattle/Tacoma Intl-ORD Chicago O'Hare Intl

5h 55m1 stop Denver Intl

R4 796United Airlines

Wed, Dec 2 - Wed, Dec 9

Cheap last-minute flights

Enter your travel dates to find the best prices.

7:20 - 14:45ORD Chicago O'Hare Intl-SEA Seattle/Tacoma Intl

9h 25m1 stop San Diego

17:51 - 23:59SEA Seattle/Tacoma Intl-ORD Chicago O'Hare Intl

4h 08mdirect

R6 279Alaska Airlines

Sat, Nov 7 - Sat, Nov 7

14:07 - 20:55ORD Chicago O'Hare Intl-SEA Seattle/Tacoma Intl

8h 48m2 stops Portland Spokane

23:42 - 5:40SEA Seattle/Tacoma Intl-ORD Chicago O'Hare Intl

3h 58mdirect

R7 267Alaska Airlines

Wed, Nov 11 - Wed, Nov 11

19:57 - 14:45ORD Chicago O'Hare Intl-SEA Seattle/Tacoma Intl

20h 48m1 stop San Diego

17:51 - 23:59SEA Seattle/Tacoma Intl-ORD Chicago O'Hare Intl

4h 08mdirect

R7 284Alaska Airlines

Sun, Nov 8 - Mon, Nov 9

19:57 - 14:45ORD Chicago O'Hare Intl-SEA Seattle/Tacoma Intl

20h 48m1 stop San Diego

17:51 - 23:59SEA Seattle/Tacoma Intl-ORD Chicago O'Hare Intl

4h 08mdirect

R8 042Alaska Airlines

Mon, Nov 9 - Tue, Nov 10

18:35 - 21:29ORD Chicago O'Hare Intl-SEA Seattle/Tacoma Intl

4h 54mdirect

23:42 - 5:40SEA Seattle/Tacoma Intl-ORD Chicago O'Hare Intl

3h 58mdirect

R8 602Alaska Airlines

Sat, Nov 7 - Sat, Nov 7

12:58 - 15:36ORD Chicago O'Hare Intl-SEA Seattle/Tacoma Intl

4h 38mdirect

17:55 - 23:59SEA Seattle/Tacoma Intl-ORD Chicago O'Hare Intl

4h 04mdirect

R8 635Delta

Mon, Nov 9 - Wed, Nov 11

12:50 - 15:25ORD Chicago O'Hare Intl-SEA Seattle/Tacoma Intl

4h 35mdirect

17:55 - 23:59SEA Seattle/Tacoma Intl-ORD Chicago O'Hare Intl

4h 04mdirect

R8 685Delta

Fri, Nov 6 - Mon, Nov 9

14:15 - 14:45ORD Chicago O'Hare Intl-SEA Seattle/Tacoma Intl

26h 30m1 stop San Diego

17:51 - 23:59SEA Seattle/Tacoma Intl-ORD Chicago O'Hare Intl

4h 08mdirect

R8 751Alaska Airlines

Mon, Nov 9 - Tue, Nov 10

6:40 - 9:30ORD Chicago O'Hare Intl-SEA Seattle/Tacoma Intl

4h 50mdirect

17:55 - 23:59SEA Seattle/Tacoma Intl-ORD Chicago O'Hare Intl

4h 04mdirect

R8 767Delta

Mon, Nov 9 - Thu, Nov 12

7:30 - 14:55ORD Chicago O'Hare Intl-SEA Seattle/Tacoma Intl

9h 25m1 stop Salt Lake City

7:27 - 13:37SEA Seattle/Tacoma Intl-ORD Chicago O'Hare Intl

4h 10mdirect

R8 800Delta

Mon, Nov 9 - Wed, Nov 11

Cheap direct flights

Enter your travel dates to find the best prices.

20:59 - 23:53ORD Chicago O'Hare Intl-SEA Seattle/Tacoma Intl

4h 54mdirect

23:39 - 5:40SEA Seattle/Tacoma Intl-ORD Chicago O'Hare Intl

4h 01mdirect

R4 565Alaska Airlines

Wed, Dec 23 - Thu, Dec 24

19:42 - 22:32ORD Chicago O'Hare Intl-SEA Seattle/Tacoma Intl

4h 50mdirect

23:44 - 5:58SEA Seattle/Tacoma Intl-ORD Chicago O'Hare Intl

4h 14mdirect

R4 680United Airlines

Tue, Dec 22 - Fri, Dec 25

6:00 - 8:57ORD Chicago O'Hare Intl-SEA Seattle/Tacoma Intl

4h 57mdirect

17:48 - 23:59SEA Seattle/Tacoma Intl-ORD Chicago O'Hare Intl

4h 11mdirect

R4 730Alaska Airlines

Wed, Dec 16 - Wed, Dec 23

17:55 - 20:42ORD Chicago O'Hare Intl-SEA Seattle/Tacoma Intl

4h 47mdirect

10:39 - 16:50SEA Seattle/Tacoma Intl-ORD Chicago O'Hare Intl

4h 11mdirect

R4 812Delta

Mon, Dec 7 - Thu, Dec 10

18:57 - 21:56ORD Chicago O'Hare Intl-SEA Seattle/Tacoma Intl

4h 59mdirect

23:39 - 5:40SEA Seattle/Tacoma Intl-ORD Chicago O'Hare Intl

4h 01mdirect

R4 894Alaska Airlines

Thu, Dec 17 - Sat, Dec 26

20:59 - 23:53ORD Chicago O'Hare Intl-SEA Seattle/Tacoma Intl

4h 54mdirect

23:39 - 5:40SEA Seattle/Tacoma Intl-ORD Chicago O'Hare Intl

4h 01mdirect

R5 059Alaska Airlines

Mon, Dec 21 - Sat, Dec 26

20:59 - 23:53ORD Chicago O'Hare Intl-SEA Seattle/Tacoma Intl

4h 54mdirect

23:39 - 5:40SEA Seattle/Tacoma Intl-ORD Chicago O'Hare Intl

4h 01mdirect

R5 142Alaska Airlines

Mon, Dec 21 - Sat, Dec 26

9:00 - 12:00ORD Chicago O'Hare Intl-SEA Seattle/Tacoma Intl

5h 00mdirect

17:48 - 23:59SEA Seattle/Tacoma Intl-ORD Chicago O'Hare Intl

4h 11mdirect

R5 224Alaska Airlines

Thu, Dec 10 - Sun, Jan 3

6:00 - 9:00ORD Chicago O'Hare Intl-SEA Seattle/Tacoma Intl

5h 00mdirect

23:39 - 5:40SEA Seattle/Tacoma Intl-ORD Chicago O'Hare Intl

4h 01mdirect

R5 389Alaska Airlines

Mon, Dec 21 - Sun, Dec 27

19:55 - 22:43ORD Chicago O'Hare Intl-SEA Seattle/Tacoma Intl

4h 48mdirect

23:44 - 5:58SEA Seattle/Tacoma Intl-ORD Chicago O'Hare Intl

4h 14mdirect

R5 405United Airlines

Thu, Dec 10 - Sat, Dec 19

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Delta flights from Chicago to Seattle

Our best Delta deals on Chicago to Seattle flight tickets

Delta

Dec 16

ORD6:49Chicago O'Hare Intl

9h 47m

1 stop

SEA14:36Seattle/Tacoma Intl

Jan 18

SEA17:59Seattle/Tacoma Intl

4h 00m

ORD23:59Chicago O'Hare Intl

R4 400

Delta

Nov 25

ORD6:40Chicago O'Hare Intl

4h 50m

SEA9:30Seattle/Tacoma Intl

Dec 2

SEA14:05Seattle/Tacoma Intl

7h 51m

1 stop

ORD23:56Chicago O'Hare Intl

R4 482

Delta

Dec 7

ORD17:55Chicago O'Hare Intl

4h 47m

SEA20:42Seattle/Tacoma Intl

Dec 10

SEA6:00Seattle/Tacoma Intl

8h 43m

1 stop

ORD16:43Chicago O'Hare Intl

R4 977

Alaska Airlines flights from Chicago to Seattle

Our best Alaska Airlines deals on Chicago to Seattle flight tickets

Alaska Airlines

Dec 23

ORD20:59Chicago O'Hare Intl

4h 54m

SEA23:53Seattle/Tacoma Intl

Dec 29

SEA17:48Seattle/Tacoma Intl

4h 11m

ORD23:59Chicago O'Hare Intl

R4 565

Alaska Airlines

Dec 10

ORD14:13Chicago O'Hare Intl

8h 43m

1 stop

SEA20:56Seattle/Tacoma Intl

Dec 10

SEA23:40Seattle/Tacoma Intl

3h 57m

ORD5:37Chicago O'Hare Intl

R4 631

Alaska Airlines

Dec 17

ORD18:57Chicago O'Hare Intl

4h 59m

SEA21:56Seattle/Tacoma Intl

Dec 26

SEA23:39Seattle/Tacoma Intl

4h 01m

ORD5:40Chicago O'Hare Intl

R4 894

Fly from

Fly to

Route

Depart

Return

Price

Cheapest return flight

ChicagoSeattle

ORD Chicago O'Hare Intl - SEA Seattle/Tacoma Intl

ORDSEA

Chicago O'Hare Intl

Wed 16/12

6:49-14:36

1 stop9h 47m

Seattle/Tacoma Intl

Mon 18/1

17:59-23:59

Nonstop4h 00m

R4 400

ChicagoSeattle

ORD Chicago O'Hare Intl - SEA Seattle/Tacoma Intl

ORDSEA

Chicago O'Hare Intl

Wed 25/11

6:40-9:30

Nonstop4h 50m

Seattle/Tacoma Intl

Wed 2/12

14:05-23:56

1 stop7h 51m

R4 482

Fastest return journey

ChicagoSeattle

ORD Chicago O'Hare Intl - SEA Seattle/Tacoma Intl

ORDSEA

Chicago O'Hare Intl

Wed 23/12

20:59-23:53

Nonstop4h 54m

Seattle/Tacoma Intl

Thu 24/12

23:39-5:40

Nonstop4h 01m

R4 565

ChicagoSeattle

ORD Chicago O'Hare Intl - SEA Seattle/Tacoma Intl

ORDSEA

Chicago O'Hare Intl

Thu 10/12

14:13-20:56

1 stop8h 43m

Seattle/Tacoma Intl

Thu 10/12

23:40-5:37

Nonstop3h 57m

R4 631

ChicagoSeattle

ORD Chicago O'Hare Intl - SEA Seattle/Tacoma Intl

ORDSEA

Chicago O'Hare Intl

Tue 15/12

16:20-21:21

1 stop7h 01m

Seattle/Tacoma Intl

Wed 6/1

5:00-13:21

1 stop6h 21m

R4 647

ChicagoSeattle

ORD Chicago O'Hare Intl - SEA Seattle/Tacoma Intl

ORDSEA

Chicago O'Hare Intl

Thu 26/11

13:30-20:56

1 stop9h 26m

Seattle/Tacoma Intl

Tue 5/1

7:00-13:12

Nonstop4h 12m

R4 664

ChicagoSeattle

ORD Chicago O'Hare Intl - SEA Seattle/Tacoma Intl

ORDSEA

Chicago O'Hare Intl

Tue 22/12

19:42-22:32

Nonstop4h 50m

Seattle/Tacoma Intl

Fri 25/12

23:44-5:58

Nonstop4h 14m

R4 680

ChicagoSeattle

ORD Chicago O'Hare Intl - SEA Seattle/Tacoma Intl

ORDSEA

Chicago O'Hare Intl

Wed 25/11

17:48-23:15

1 stop7h 27m

Seattle/Tacoma Intl

Fri 27/11

22:56-5:06

Nonstop4h 10m

R4 730

ChicagoSeattle

ORD Chicago O'Hare Intl - SEA Seattle/Tacoma Intl

ORDSEA

Chicago O'Hare Intl

Tue 22/12

19:42-22:32

Nonstop4h 50m

Seattle/Tacoma Intl

Fri 25/12

13:02-21:30

1 stop6h 28m

R4 763

ChicagoSeattle

ORD Chicago O'Hare Intl - SEA Seattle/Tacoma Intl

ORDSEA

Chicago O'Hare Intl

Wed 2/12

15:00-20:47

1 stop7h 47m

Seattle/Tacoma Intl

Wed 9/12

16:04-23:59

1 stop5h 55m

R4 796

Flights are sorted by cheapest return flights first.

Showing 1-10 of 20 resultsSorted by cheapest first

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

Prices

Airlines

Other information

What is the typical price of a round-trip flight between Chicago and Seattle?

Prices are currently low for flights on this route.

Typical prices usually range from R5 076 to R7 795.
The lowest price recently found on this route was R4 400.

What is the cheapest month to fly to Seattle?

The cheapest month to fly to Seattle from Chicago is in January. Flight prices, which tend to average around R3 741, are often lower during this time because this is during the off-season. If you aren’t able to travel to Seattle during the month of January, then flying in February is also cheap. Prices for this month can be found on momondo for an average of R3 955.

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 from Chicago to Seattle?

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 R5 576 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 R5 554 on momondo.

What cabin class options are available on Chicago to Seattle flights?

There is only 1 cabin class 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.

How have Chicago to Seattle flight prices changed over time?

As of November 2026, prices for Chicago to Seattle flights are approximately 11% more expensive when compared to flights at the same time last year.

When to book flights from Chicago to Seattle

Are you open to changing your travel dates? Check out the ideal times to fly from Chicago to Seattle according to our flight data. Find out which month and days have the cheapest flights.

Estimated return price

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

Best price found	R2 406
Direct flights	Every day
Airports in Seattle	1 airport

The best one-way flight to Seattle from Chicago in the past 72 hours is R2 406. The best return flight deal from Chicago to Seattle found on momondo in the last 72 hours is R4 400.

Direct flights go from Chicago to Seattle every day.

There is 1 airport in Seattle. From Chicago there are direct flights to Seattle/Tacoma Intl (SEA).

Search flight deals

Frequently asked questions about flying from Chicago to Seattle

How far is Chicago to Seattle/Tacoma Intl by plane?
Chicago and Seattle/Tacoma Intl are 2787,8 km apart from one another.
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 are refreshed on a daily basis.
How old do you have to be to fly from Chicago to Seattle/Tacoma Intl Airport?
The minimum age a child must be to fly alone is five but airlines that offer an unaccompanied minor (UNMR) service will have their own age restrictions, including rules around flight length, timings, and stopovers. We always recommend checking with the individual airline you are booking with to 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 licence, 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 flights between Chicago and Seattle, the leading plane model is Boeing 737-900, making up 18,64% of the total bookings. Other popular models include Airbus A321-100/200 with 17,11%, Boeing 737-800 with 15,57%, and Airbus A321neo with 11,97%.

Lynnwood

Why use momondo?

Why should I use momondo to find a flight deal from Chicago to Seattle?

To find the flight that best suits your needs, momondo gathers a range of flights from a large pool of different airlines and agents; you can then use our insights and filters to find and book the right flight to Seattle from Chicago.

Can I find flights from Chicago to Seattle with flexible booking policies on momondo?

Flights from Chicago to Seattle with flexible booking policies can be found by using the search form above and then selecting our dedicated flexible booking filter, which will highlight only the flights where this policy is applied.

How can momondo help me find flights from Chicago to Seattle?

momondo offers useful filters to help you find the right flight. Choose specific flight times, airports or even what payment method you prefer. We have numerous options to help you book your ideal flight from Chicago to Seattle.

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.