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Cheap flights from Chicago to Seattle from £68

This is the cheapest one-way flight price found by a momondo user in the last 72 hours by searching for a flight from Chicago to Seattle departing on 11/1. Fares may change, and may not be available for all flights or travel dates. Click the price to refresh the search for this deal.
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0 bags
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Cheap return flights

Enter your travel dates to find the best prices.
United Airlines Logo
09:00 - 11:49ORD-SEA
4h 49mdirect
United Airlines Logo
12:37 - 23:26SEA-ORD
8h 49m1 stop
£132United Airlines
Find Deal
Thu, 19 Feb - Sat, 21 Feb
Southwest Logo
16:25 - 23:05ORD-SEA
8h 40m1 stop
Southwest Logo
12:00 - 22:35SEA-ORD
8h 35m1 stop
£134Southwest
Find Deal
Wed, 28 Jan - Sat, 31 Jan
United Airlines Logo
09:02 - 11:45ORD-SEA
4h 43mdirect
United Airlines Logo
13:40 - 19:52SEA-ORD
4h 12mdirect
£135United Airlines
Find Deal
Fri, 5 Dec - Fri, 12 Dec
United Airlines Logo
19:54 - 22:43ORD-SEA
4h 49mdirect
United Airlines Logo
12:40 - 00:28SEA-ORD
9h 48m1 stop
£140United Airlines
Find Deal
Fri, 16 Jan - Sun, 18 Jan
Alaska Airlines Logo
14:06 - 20:35ORD-SEA
8h 29m1 stop
Alaska Airlines Logo
10:32 - 23:37SEA-ORD
11h 05m1 stop
£142Alaska Airlines
Find Deal
Tue, 13 Jan - Wed, 21 Jan
Delta Logo
07:50 - 10:41ORD-SEA
4h 51mdirect
Delta Logo
23:55 - 08:40SEA-ORD
6h 45m1 stop
£143Delta
Find Deal
Wed, 3 Dec - Wed, 10 Dec
Delta Logo
06:45 - 14:45ORD-SEA
10h 00m1 stop
Delta Logo
11:15 - 17:18SEA-ORD
4h 03mdirect
£144Delta
Find Deal
Sat, 6 Dec - Sat, 13 Dec
Alaska Airlines Logo
18:08 - 20:58ORD-SEA
4h 50mdirect
Alaska Airlines Logo
00:25 - 06:29SEA-ORD
4h 04mdirect
£147Alaska Airlines
Find Deal
Sat, 20 Dec - Fri, 26 Dec
American Airlines Logo
20:34 - 23:25ORD-SEA
4h 51mdirect
American Airlines Logo
11:22 - 17:34SEA-ORD
4h 12mdirect
£189American Airlines
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Thu, 4 Dec - Fri, 5 Dec
Sun Country Air Logo
11:45 - 17:18ORD-SEA
7h 33m1 stop
Sun Country Air Logo
18:26 - 17:44SEA-ORD
21h 18m1 stop
£195Sun Country Air
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Thu, 18 Dec - Mon, 29 Dec

United Airlines flights from Chicago to Seattle

Our best United Airlines deals on Chicago to Seattle flight tickets
United Airlines
19 Feb
ORD09:00Chicago O'Hare Intl
4h 49m
SEA11:49Seattle/Tacoma Intl
21 Feb
SEA12:37Seattle/Tacoma Intl
8h 49m
1 stop
ORD23:26Chicago O'Hare Intl
£132
Find similar
United Airlines
5 Dec
ORD09:02Chicago O'Hare Intl
4h 43m
SEA11:45Seattle/Tacoma Intl
12 Dec
SEA13:40Seattle/Tacoma Intl
4h 12m
ORD19:52Chicago O'Hare Intl
£135
Find similar
United Airlines
16 Jan
ORD19:54Chicago O'Hare Intl
4h 49m
SEA22:43Seattle/Tacoma Intl
18 Jan
SEA12:40Seattle/Tacoma Intl
9h 48m
1 stop
ORD00:28Chicago O'Hare Intl
£140
Find similar

Southwest flights from Chicago to Seattle

Our best Southwest deals on Chicago to Seattle flight tickets
Southwest
28 Jan
ORD16:25Chicago O'Hare Intl
8h 40m
1 stop
SEA23:05Seattle/Tacoma Intl
31 Jan
SEA12:00Seattle/Tacoma Intl
8h 35m
1 stop
ORD22:35Chicago O'Hare Intl
£134
Find similar
Southwest
28 Jan
ORD14:15Chicago O'Hare Intl
10h 50m
2 stops
SEA23:05Seattle/Tacoma Intl
31 Jan
SEA12:00Seattle/Tacoma Intl
8h 35m
1 stop
ORD22:35Chicago O'Hare Intl
£174
Find similar
Southwest
19 Nov
ORD13:00Chicago O'Hare Intl
11h 55m
2 stops
SEA22:55Seattle/Tacoma Intl
21 Nov
SEA11:15Seattle/Tacoma Intl
9h 20m
1 stop
ORD22:35Chicago O'Hare Intl
£292
Find similar

momondo Fare Finder

 
Customise your flight search to find flights from Chicago to Seattle 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, momondo users made 279,928 searches. Data last updated 7 November 2025.
Use the filters below to find and compare flights from Chicago to Seattle that are best for you.

Fly from

Fly to

Route

Depart

Return

Price

ChicagoSeattle

ORD - SEA

ORDSEA

Chicago O'Hare Intl

Thu 19/2

09:00-11:49

Nonstop4h 49m

Seattle/Tacoma Intl

Sat 21/2

12:37-23:26

1 stop8h 49m

£132

ChicagoSeattle

ORD - SEA

ORDSEA

Chicago O'Hare Intl

Wed 28/1

16:25-23:05

1 stop8h 40m

Seattle/Tacoma Intl

Sat 31/1

12:00-22:35

1 stop8h 35m

£134

ChicagoSeattle

ORD - SEA

ORDSEA

Chicago O'Hare Intl

Fri 5/12

09:02-11:45

Nonstop4h 43m

Seattle/Tacoma Intl

Fri 12/12

13:40-19:52

Nonstop4h 12m

£135

ChicagoSeattle

ORD - SEA

ORDSEA

Chicago O'Hare Intl

Fri 16/1

19:54-22:43

Nonstop4h 49m

Seattle/Tacoma Intl

Sun 18/1

12:40-00:28

1 stop9h 48m

£140

ChicagoSeattle

ORD - SEA

ORDSEA

Chicago O'Hare Intl

Tue 13/1

14:06-20:35

1 stop8h 29m

Seattle/Tacoma Intl

Wed 21/1

10:32-23:37

1 stop11h 05m

£142

ChicagoSeattle

ORD - SEA

ORDSEA

Chicago O'Hare Intl

Wed 3/12

07:50-10:41

Nonstop4h 51m

Seattle/Tacoma Intl

Wed 10/12

23:55-08:40

1 stop6h 45m

£143

ChicagoSeattle

ORD - SEA

ORDSEA

Chicago O'Hare Intl

Sat 6/12

06:45-14:45

1 stop10h 00m

Seattle/Tacoma Intl

Sat 13/12

11:15-17:18

Nonstop4h 03m

£144

ChicagoSeattle

ORD - SEA

ORDSEA

Chicago O'Hare Intl

Sat 20/12

18:08-20:58

Nonstop4h 50m

Seattle/Tacoma Intl

Fri 26/12

00:25-06:29

Nonstop4h 04m

£147

ChicagoSeattle

ORD - SEA

ORDSEA

Chicago O'Hare Intl

Thu 4/12

20:34-23:25

Nonstop4h 51m

Seattle/Tacoma Intl

Fri 5/12

11:22-17:34

Nonstop4h 12m

£189

ChicagoSeattle

ORD - SEA

ORDSEA

Chicago O'Hare Intl

Thu 18/12

11:45-17:18

1 stop7h 33m

Seattle/Tacoma Intl

Mon 29/12

18:26-17:44

1 stop21h 18m

£195

Flights are sorted by cheapest return flights first.

Showing 1-10 of 20 resultsSorted by cheapest first
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See travel insights to Seattle from

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 £167, are often lower during this time because this is during the off-season. The month of April is another great option to travel to Seattle, with average flight prices from Chicago averaging around £175.

What is the cheapest day to depart on your flight to Seattle?

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 £190. 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 £988.

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 £223. 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 £488.

What is the cheapest Chicago to Seattle/Tacoma Intl flight route?

Fly from Chicago Midway 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 weeks ahead of your departure date. In general, you can expect to find flights to Seattle for around £219 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 £194 on momondo.

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

There are 2 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 have Chicago to Seattle flight prices changed over time?

As of November 2025, prices for Chicago to Seattle flights are approximately 27% 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

£379

Fastest flight time

4h 37m

Direct flights

Every day

Airports in Seattle

1 airport
The best flight deal from Chicago to Seattle found on momondo in the last 72 hours is £379
The fastest flight from Chicago to Seattle takes 4h 37m
Direct flights go from Chicago to Seattle every day.
There is 1 airport near Seattle: Seattle/Tacoma Intl (SEA)
Search flight deals

  • 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 37m.

  • 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?

Travelling to a place near Seattle?

Book flights to Seattle if you plan to visit one of these locations
Fife
Renton
SeaTac

Why 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.

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