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Cheap flights from Chicago to Seattle from £66

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 17/2. Fares may change, and may not be available for all flights or travel dates. Click the price to refresh the search for this deal.
1 adult
0 bags
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Alaska Airlines Logo
17:29 - 20:16
ORD
-
SEA
4h 47mdirect
Alaska Airlines Logo
17:49 - 23:59
SEA
-
ORD
4h 10mdirect
£132Alaska Airlines
Thu, 5 Mar - Tue, 24 Mar
United Airlines Logo
08:50 - 11:32
ORD
-
SEA
4h 42mdirect
United Airlines Logo
12:32 - 23:26
SEA
-
ORD
8h 54m
1 stop
£136United Airlines
Wed, 11 Feb - Wed, 18 Feb
Alaska Airlines Logo
07:00 - 09:51
ORD
-
SEA
4h 51mdirect
Alaska Airlines Logo
21:40 - 13:11
SEA
-
ORD
13h 31m
1 stop
£139Alaska Airlines
Thu, 12 Mar - Mon, 16 Mar
United Airlines Logo
16:20 - 19:03
ORD
-
SEA
4h 43mdirect
United Airlines Logo
23:59 - 05:56
SEA
-
ORD
3h 57mdirect
£140United Airlines
Sat, 14 Mar - Sat, 21 Mar
United Airlines Logo
20:01 - 22:45
ORD
-
SEA
4h 44mdirect
United Airlines Logo
23:59 - 05:56
SEA
-
ORD
3h 57mdirect
£145United Airlines
Mon, 16 Mar - Fri, 20 Mar
United Airlines Logo
16:20 - 19:03
ORD
-
SEA
4h 43mdirect
United Airlines Logo
07:00 - 13:06
SEA
-
ORD
4h 06mdirect
£146United Airlines
Fri, 13 Feb - Sun, 15 Feb
Alaska Airlines Logo
15:07 - 23:40
ORD
-
SEA
10h 33m
1 stop
Alaska Airlines Logo
00:35 - 06:39
SEA
-
ORD
4h 04mdirect
£147Alaska Airlines
Wed, 4 Mar - Sun, 22 Mar
Southwest Logo
19:20 - 01:40
ORD
-
SEA
8h 20m
1 stop
Southwest Logo
07:50 - 23:55
SEA
-
ORD
14h 05m
1 stop
£151Southwest
Fri, 13 Mar - Mon, 16 Mar
United Airlines Logo
12:54 - 19:28
ORD
-
SEA
8h 34m
1 stop
United Airlines Logo
23:59 - 05:56
SEA
-
ORD
3h 57mdirect
£154United Airlines
Thu, 12 Mar - Sun, 22 Mar
United Airlines Logo
15:35 - 18:14
ORD
-
SEA
4h 39mdirect
United Airlines Logo
12:35 - 23:14
SEA
-
ORD
8h 39m
1 stop
£157United Airlines
Sat, 7 Feb - Mon, 9 Feb

United Airlines flights from Chicago to Seattle

Our best United Airlines deals on Chicago to Seattle flight tickets
United Airlines
11 Feb
ORD08:50Chicago O'Hare Intl
4h 42m
SEA11:32Seattle/Tacoma Intl
18 Feb
SEA12:32Seattle/Tacoma Intl
8h 54m
1 stop
ORD23:26Chicago O'Hare Intl
£136
United Airlines
12 Mar
ORD16:20Chicago O'Hare Intl
4h 43m
SEA19:03Seattle/Tacoma Intl
15 Mar
SEA23:59Seattle/Tacoma Intl
3h 57m
ORD05:56Chicago O'Hare Intl
£140
United Airlines
16 Mar
ORD20:01Chicago O'Hare Intl
4h 44m
SEA22:45Seattle/Tacoma Intl
20 Mar
SEA23:59Seattle/Tacoma Intl
3h 57m
ORD05:56Chicago O'Hare Intl
£145

Southwest flights from Chicago to Seattle

Our best Southwest deals on Chicago to Seattle flight tickets
Southwest
13 Mar
ORD19:20Chicago O'Hare Intl
8h 20m
1 stop
SEA01:40Seattle/Tacoma Intl
16 Mar
SEA07:50Seattle/Tacoma Intl
14h 05m
1 stop
ORD23:55Chicago O'Hare Intl
£151
Southwest
28 Feb
ORD17:15Chicago O'Hare Intl
7h 35m
1 stop
SEA22:50Seattle/Tacoma Intl
7 Mar
SEA13:20Seattle/Tacoma Intl
8h 35m
1 stop
ORD23:55Chicago O'Hare Intl
£164
Southwest
14 Mar
ORD19:20Chicago O'Hare Intl
8h 05m
1 stop
SEA01:25Seattle/Tacoma Intl
17 Mar
SEA07:00Seattle/Tacoma Intl
13h 55m
1 stop
ORD22:55Chicago O'Hare Intl
£189

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 20 January 2026.
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 5/3

17:29-20:16

Nonstop4h 47m

Seattle/Tacoma Intl

Tue 24/3

17:49-23:59

Nonstop4h 10m

£132

ChicagoSeattle

ORD - SEA

ORDSEA

Chicago O'Hare Intl

Wed 11/2

08:50-11:32

Nonstop4h 42m

Seattle/Tacoma Intl

Wed 18/2

12:32-23:26

1 stop8h 54m

£136

ChicagoSeattle

ORD - SEA

ORDSEA

Chicago O'Hare Intl

Thu 12/3

07:00-09:51

Nonstop4h 51m

Seattle/Tacoma Intl

Mon 16/3

21:40-13:11

1 stop13h 31m

£139

ChicagoSeattle

ORD - SEA

ORDSEA

Chicago O'Hare Intl

Sat 14/3

16:20-19:03

Nonstop4h 43m

Seattle/Tacoma Intl

Sat 21/3

23:59-05:56

Nonstop3h 57m

£140

ChicagoSeattle

ORD - SEA

ORDSEA

Chicago O'Hare Intl

Mon 16/3

20:01-22:45

Nonstop4h 44m

Seattle/Tacoma Intl

Fri 20/3

23:59-05:56

Nonstop3h 57m

£145

ChicagoSeattle

ORD - SEA

ORDSEA

Chicago O'Hare Intl

Fri 13/2

16:20-19:03

Nonstop4h 43m

Seattle/Tacoma Intl

Sun 15/2

07:00-13:06

Nonstop4h 06m

£146

ChicagoSeattle

ORD - SEA

ORDSEA

Chicago O'Hare Intl

Wed 4/3

15:07-23:40

1 stop10h 33m

Seattle/Tacoma Intl

Sun 22/3

00:35-06:39

Nonstop4h 04m

£147

ChicagoSeattle

ORD - SEA

ORDSEA

Chicago O'Hare Intl

Fri 13/3

19:20-01:40

1 stop8h 20m

Seattle/Tacoma Intl

Mon 16/3

07:50-23:55

1 stop14h 05m

£151

ChicagoSeattle

ORD - SEA

ORDSEA

Chicago O'Hare Intl

Thu 12/3

12:54-19:28

1 stop8h 34m

Seattle/Tacoma Intl

Sun 22/3

23:59-05:56

Nonstop3h 57m

£154

ChicagoSeattle

ORD - SEA

ORDSEA

Chicago O'Hare Intl

Sat 7/2

15:35-18:14

Nonstop4h 39m

Seattle/Tacoma Intl

Mon 9/2

12:35-23:14

1 stop8h 39m

£157

Flights are sorted by cheapest return flights first.

Showing 1-10 of 20 resultsSorted by cheapest first
1
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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 £160, are often lower during this time because this is during the off-season. The month of January is another great option to travel to Seattle, with average flight prices from Chicago averaging around £177.

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 £185. 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 £482.

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 £218. 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 £370.

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 weeks ahead of your departure date. In general, you can expect to find flights to Seattle for around £207 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 £181 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 January 2026, prices for Chicago to Seattle flights are approximately 5% cheaper 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

Fastest flight time

4h 41m

Direct flights

Every day

Airports in Seattle

1 airport
The fastest flight from Chicago to Seattle takes 4h 41m
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

  • 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 41m.

  • 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
SeaTac
Tukwila

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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