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Cheap flights from Chicago to Seattle from £74

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 10/3. Fares are subject to change and may not be available on all flights or dates of travel.
CHI — SEA
17 Mar — 24 Mar1
1 adult
1 adult, Economy, 0 bags
Cheapflights Tip: The best prices from Chicago to Seattle/Tacoma Intl are usually found in January or February, booked 31 days in advance, depart on a Tuesday or Wednesday and return on a Monday

Cheap flight deals from Chicago to Seattle

Enter your travel dates to find the best prices.

Cheapest flights from Chicago to Seattle
Explore the most affordable flight options available from Chicago to Seattle. Find the lowest fares from popular airlines and budget airlines, with prices last updated on 15 February 2026.

Sat 22/815:55
ORD
-
SEA
1 stop9h 04m
United Airlines
Sat 29/817:15
SEA
-
ORD
Nonstop4h 05m
United Airlines
Deal found 14/2£137
Thu 16/406:00
ORD
-
SEA
Nonstop4h 37m
Alaska Airlines
Sun 19/400:35
SEA
-
ORD
Nonstop4h 04m
Alaska Airlines
Deal found 11/2£143
Fri 24/406:00
ORD
-
SEA
Nonstop4h 32m
Alaska Airlines
Sun 26/417:42
SEA
-
ORD
Nonstop4h 17m
Alaska Airlines
Deal found 12/2£147
Wed 29/707:20
ORD
-
SEA
Nonstop4h 37m
Delta
Sat 8/807:20
SEA
-
ORD
Nonstop4h 10m
Delta
Deal found 14/2£150
Tue 17/307:00
ORD
-
SEA
Nonstop4h 51m
Alaska Airlines
Tue 17/312:56
SEA
-
ORD
1 stop23h 25m
Alaska Airlines
Deal found 12/2£152
Sat 6/621:15
ORD
-
SEA
Nonstop4h 44m
United Airlines
Sun 14/622:40
SEA
-
ORD
Nonstop4h 07m
United Airlines
Deal found 14/2£158
Sat 14/320:01
ORD
-
SEA
Nonstop4h 44m
United Airlines
Sat 28/307:00
SEA
-
ORD
Nonstop4h 06m
United Airlines
Deal found 14/2£159
Tue 3/307:00
ORD
-
SEA
Nonstop4h 51m
Alaska Airlines
Tue 10/310:30
SEA
-
ORD
1 stop11h 29m
Alaska Airlines
Deal found 11/2£163
Sat 14/320:01
ORD
-
SEA
Nonstop4h 44m
United Airlines
Tue 17/312:36
SEA
-
ORD
1 stop9h 02m
United Airlines
Deal found 14/2£164
Sat 21/320:01
ORD
-
SEA
Nonstop4h 44m
United Airlines
Wed 25/323:59
SEA
-
ORD
Nonstop3h 57m
United Airlines
Deal found 14/2£165
Sat 14/320:01
ORD
-
SEA
Nonstop4h 44m
United Airlines
Wed 25/323:59
SEA
-
ORD
1 stop8h 08m
United Airlines
Deal found 14/2£168
Mon 13/408:00
ORD
-
SEA
Nonstop4h 43m
Alaska Airlines
Sat 18/400:35
SEA
-
ORD
Nonstop4h 04m
Alaska Airlines
Deal found 12/2£169

Find flight deals from Chicago to Seattle

Discover tips and strategies to find the most affordable flight options for your journey from Chicago (CHI) to Seattle (SEA). 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 15 February 2026.

Round-trip from

£143

One-way from

£74

Popular in

June

Cheapest in

January

Average price

£172
Alaska Airlines
  • Alaska Airlines
  • 16/4-20/4
  • Nonstop
  • 8h 41m total
  • Chicago to Seattle
Search Deals
Alaska Airlines
  • Alaska Airlines
  • 9/3
  • Nonstop
  • 4h 51m total
  • Chicago to Seattle
Search Deals
Highest demand for flights based on searches. 10% potential increase in price (£16 potential increase over avg. return price).
Search Deals
Cheapest flight prices on average. 2% potential price decrease (£3 potential savings vs. average return price).
Search Deals
Average for round-trip flights in February 2026
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Cheapflights 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, Cheapflights users made 858,174 searches. Data last updated 15 February 2026.
Use the filters below to find and compare flights from Chicago to Seattle that are best for you.

Fly from

Chicago

Fly to

Seattle

Route

Depart

Return

Price

ChicagoSeattle

ORD - SEA

ORDSEA

Chicago O'Hare Intl

Tue 24/3

08:00-10:43

Nonstop4h 43m

Seattle/Tacoma Intl

Wed 1/4

17:49-23:59

Nonstop4h 10m

£172

ChicagoSeattle

ORD - SEA

ORDSEA

Chicago O'Hare Intl

Tue 31/3

13:59-16:37

Nonstop4h 38m

Seattle/Tacoma Intl

Tue 7/4

23:59-05:59

Nonstop4h 00m

£172

ChicagoSeattle

ORD - SEA

ORDSEA

Chicago O'Hare Intl

Wed 29/4

12:46-15:20

Nonstop4h 34m

Seattle/Tacoma Intl

Sat 2/5

07:15-13:23

Nonstop4h 08m

£172

ChicagoSeattle

ORD - SEA

ORDSEA

Chicago O'Hare Intl

Wed 29/4

06:00-08:32

Nonstop4h 32m

Seattle/Tacoma Intl

Tue 5/5

13:28-19:52

Nonstop4h 24m

£172

ChicagoSeattle

ORD - SEA

ORDSEA

Chicago O'Hare Intl

Tue 17/3

15:54-18:40

Nonstop4h 46m

Seattle/Tacoma Intl

Tue 24/3

00:35-06:39

Nonstop4h 04m

£172

ChicagoSeattle

ORD - SEA

ORDSEA

Chicago O'Hare Intl

Wed 29/4

06:00-08:32

Nonstop4h 32m

Seattle/Tacoma Intl

Sat 2/5

09:07-19:03

1 stop7h 56m

£183

ChicagoSeattle

ORD - SEA

ORDSEA

Chicago O'Hare Intl

Fri 6/3

15:07-22:39

1 stop9h 32m

Seattle/Tacoma Intl

Mon 9/3

06:00-12:01

Nonstop4h 01m

£189

ChicagoSeattle

ORD - SEA

ORDSEA

Chicago O'Hare Intl

Mon 23/3

06:00-08:37

Nonstop4h 37m

Seattle/Tacoma Intl

Mon 30/3

00:35-06:39

Nonstop4h 04m

£194

ChicagoSeattle

ORD - SEA

ORDSEA

Chicago O'Hare Intl

Wed 29/4

20:48-23:29

Nonstop4h 41m

Seattle/Tacoma Intl

Sun 3/5

17:42-23:59

Nonstop4h 17m

£194

ChicagoSeattle

ORD - SEA

ORDSEA

Chicago O'Hare Intl

Thu 30/4

20:48-23:29

Nonstop4h 41m

Seattle/Tacoma Intl

Sat 9/5

17:42-23:59

Nonstop4h 17m

£194

Flights are sorted by cheapest return flights first.

Deals found on 12/2

Showing 1-10 of 23 results
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Best time to book a flight from Chicago to Seattle

Have a flexible travel schedule? Discover the best time to fly to Seattle from Chicago with our price prediction graph.
Estimated return 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 Chicago to Seattle

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

Use this chart to determine the optimal time to book a return flight from Chicago to Seattle. Price data was last updated on 13 February 2026.

Booking 31 days in advance of your planned departure date is, on average, the best time to get cheap flights from Chicago to Seattle. The general trend is that the closer you book to the departure date, the more expensive your flight will be.

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

Currently, October is the cheapest month in which you can book a flight from Chicago to Seattle (average of £83). Flying from Chicago to Seattle in December is currently the most expensive (average of £130). 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 CHI to SEA?

Find hourly flight availability from Chicago to Seattle. Discover flight options and departure times throughout the day, allowing you to choose a departure time that suits your schedule. Data last updated 15 February 2026.

When flying from Chicago to Seattle, the time of day you fly usually plays a role in the price. Save by searching for a flight in the evening, which can drop the price by up to 51% versus a flight in the morning.

Weekly flight availability from Chicago to Seattle

Explore weekly flight availability from Chicago to Seattle. 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 15 February 2026.

The most flights from CHI to SEA are scheduled on a Friday (44 on average). You will have fewer flight options on Monday, which is when the least amount of flights are scheduled (28 on average).

Related info for your journey

Find useful and relevant information for your journey from Chicago to Seattle. 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 into for flights to Seattle from Chicago?

    Seattle/Tacoma Intl (SEA), located 11.4 mi from the city center, is the airport you fly into when you book flights from Chicago to Seattle. 0 airlines have flights to Seattle/Tacoma Intl from Chicago on a regular basis. Booking flights from Chicago to Seattle/Tacoma Intl should not be difficult; the airport handles an average of 32 inbound flights from Chicago per day.

  • How long is the flight from Chicago to Seattle?

    Departing from Chicago to Seattle will take you 4h 34m. The distance between Chicago and Seattle is about 1715 mi. Generally, flights for this route are direct.

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

    The top 3 most reliable airlines when flying from Chicago to Seattle are Brussels Airlines (81%), United Airlines (67%) and Korean Air (66%).

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

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

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

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

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

    Yes. Cheapflights offers flight deals from Chicago to Seattle 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 Chicago to Seattle?

    Currently, October is the cheapest month in which you can book a flight from Chicago to Seattle (average of £83). Flying from Chicago to Seattle in December is currently the most expensive (average of £130). 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

Travelling to a place near Seattle?

Book flights to Seattle if you plan to visit one of these locations
Tacoma
Federal Way
SeaTac

Browse thousands of different options on Cheapflights for your next trip

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Alternative routes for Chicago to Seattle

See prices for flight routes from nearby airports that may be better suited for you.
O'Hare Intl to Seattle flights

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How does Cheapflights help users find flights from Chicago to Seattle?

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Why should you use Cheapflights to find cheap flight tickets from Chicago to Seattle?

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Can Cheapflights find flights from Chicago to Seattle with no change fees?

Yes, we can. To see specific flights from Chicago to Seattle with no change fees, users can toggle flexible booking options after using the search form above to find flights.

Can Cheapflights notify me if prices for flights from Chicago to Seattle become cheaper?

Yes, and it’s super simple to set up. Click the bell icon next to the flight deals above and provide a valid email address to enable Price Alerts. That’s it!

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