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Cheap flights from Chicago to Seattle from £133

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 22/9. Fares are subject to change and may not be available on all flights or dates of travel.
CHI — SEA
11 Jul — 18 Jul1
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 29 days in advance, depart on a Tuesday or Monday 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 11 June 2026.

Sun 11/1007:00
ORD
-
SEA
Nonstop4h 45m
Delta
Wed 21/1017:45
SEA
-
ORD
Nonstop4h 01m
Delta
Deal found 8/6£265
Tue 30/617:55
ORD
-
SEA
Nonstop4h 40m
Delta
Thu 9/717:40
SEA
-
ORD
Nonstop3h 58m
Delta
Deal found 10/6£265
Thu 2/706:55
ORD
-
SEA
Nonstop4h 36m
Delta
Tue 7/717:40
SEA
-
ORD
Nonstop3h 58m
Delta
Deal found 10/6£266
Thu 2/713:00
ORD
-
SEA
Nonstop4h 43m
Delta
Sat 11/707:20
SEA
-
ORD
Nonstop4h 08m
Delta
Deal found 10/6£267
Fri 3/717:42
ORD
-
SEA
Nonstop4h 39m
Alaska Airlines
Fri 3/723:26
SEA
-
ORD
1 stop16h 53m
Alaska Airlines
Deal found 9/6£268
Fri 4/914:18
ORD
-
SEA
1 stop11h 22m
Alaska Airlines
Mon 7/907:40
SEA
-
ORD
1 stop9h 41m
Alaska Airlines
Deal found 11/6£268
Wed 29/706:20
ORD
-
SEA
1 stop10h 05m
Alaska Airlines
Wed 5/800:17
SEA
-
ORD
Nonstop4h 03m
Alaska Airlines
Deal found 8/6£269
Sat 8/820:20
ORD
-
SEA
Nonstop4h 44m
Alaska Airlines
Sun 16/807:26
SEA
-
ORD
1 stop14h 10m
Alaska Airlines
Deal found 9/6£270
Sat 5/914:22
ORD
-
SEA
1 stop6h 29m
Alaska Airlines
Sun 13/917:51
SEA
-
ORD
Nonstop4h 08m
Alaska Airlines
Deal found 8/6£272
Tue 7/720:20
ORD
-
SEA
Nonstop4h 44m
Alaska Airlines
Wed 15/706:21
SEA
-
ORD
1 stop10h 36m
Alaska Airlines
Deal found 10/6£273
Sat 27/620:05
ORD
-
SEA
Nonstop4h 44m
Alaska Airlines
Wed 1/721:28
SEA
-
ORD
1 stop5h 32m
Alaska Airlines
Deal found 7/6£274
Wed 5/806:00
ORD
-
SEA
Nonstop4h 38m
Alaska Airlines
Wed 5/800:17
SEA
-
ORD
Nonstop4h 03m
Alaska Airlines
Deal found 11/6£274

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 11 June 2026.

Round-trip from

£265

One-way from

£133

Popular in

June

Cheapest in

January

Average price

£297

Good round-trip deal

£324 or less

Good one-way deal

£503 or less
Delta
  • Delta
  • 11/10-19/10
  • Nonstop
  • 8h 49m total
  • Chicago to Seattle
Search Deals
Delta
  • Delta
  • 30/6
  • Nonstop
  • 4h 36m total
  • Chicago to Seattle
Search Deals
Highest demand for flights based on searches. 20% potential increase in price (£42 potential increase over avg. return price).
Search Deals
Cheapest flight prices on average. 3% potential price decrease (£5 potential savings vs. average return price).
Search Deals
Average for round-trip flights in June 2026
Search Deals
Price to beat on a round-trip flight from Chicago (CHI) to Seattle/Tacoma Intl.
Search Deals
Price to beat on a one-way flight from Chicago (CHI) to Seattle/Tacoma Intl.
Search Deals

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 11 June 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

Cheapest return flight
Fastest return journey

ChicagoSeattle

ORD - SEA

ORDSEA

Chicago O'Hare Intl

Wed 15/7

06:55-09:27

Nonstop4h 32m

Seattle/Tacoma Intl

Mon 20/7

17:40-23:38

Nonstop3h 58m

£265

ChicagoSeattle

ORD - SEA

ORDSEA

Chicago O'Hare Intl

Tue 7/7

20:20-23:04

Nonstop4h 44m

Seattle/Tacoma Intl

Mon 13/7

17:48-23:59

Nonstop4h 11m

£265

ChicagoSeattle

ORD - SEA

ORDSEA

Chicago O'Hare Intl

Mon 13/7

06:55-09:27

Nonstop4h 32m

Seattle/Tacoma Intl

Fri 17/7

17:40-23:38

Nonstop3h 58m

£265

ChicagoSeattle

ORD - SEA

ORDSEA

Chicago O'Hare Intl

Sat 1/8

20:20-23:04

Nonstop4h 44m

Seattle/Tacoma Intl

Sat 8/8

17:48-23:59

Nonstop4h 11m

£265

ChicagoSeattle

ORD - SEA

ORDSEA

Chicago O'Hare Intl

Wed 19/8

12:54-15:40

Nonstop4h 46m

Seattle/Tacoma Intl

Sun 23/8

17:35-23:29

Nonstop3h 54m

£265

ChicagoSeattle

ORD - SEA

ORDSEA

Chicago O'Hare Intl

Wed 26/8

18:54-21:43

Nonstop4h 49m

Seattle/Tacoma Intl

Sat 29/8

06:00-12:07

Nonstop4h 07m

£265

ChicagoSeattle

ORD - SEA

ORDSEA

Chicago O'Hare Intl

Thu 2/7

06:55-09:31

Nonstop4h 36m

Seattle/Tacoma Intl

Tue 7/7

17:40-23:38

Nonstop3h 58m

£265

ChicagoSeattle

ORD - SEA

ORDSEA

Chicago O'Hare Intl

Wed 8/7

06:55-09:27

Nonstop4h 32m

Seattle/Tacoma Intl

Wed 8/7

17:40-23:38

Nonstop3h 58m

£266

ChicagoSeattle

ORD - SEA

ORDSEA

Chicago O'Hare Intl

Tue 8/9

08:00-10:34

Nonstop4h 34m

Seattle/Tacoma Intl

Tue 15/9

08:41-19:21

1 stop8h 40m

£272

ChicagoSeattle

ORD - SEA

ORDSEA

Chicago O'Hare Intl

Thu 13/8

06:00-08:38

Nonstop4h 38m

Seattle/Tacoma Intl

Sun 16/8

23:26-13:13

1 stop11h 47m

£273

Flights are sorted by cheapest return flights first.

Deals found on 9/6

Showing 1-10 of 24 resultsSorted by cheapest first
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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

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

Currently, January is the cheapest month in which you can book a flight from Chicago to Seattle (average of £66). Flying from Chicago to Seattle in February is currently the most expensive (average of £478). 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 11 June 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 morning, which can drop the price by up to 41% versus a flight in the afternoon.

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 11 June 2026.

The most flights from CHI to SEA are scheduled on a Thursday (61 on average). You will have fewer flight options on Saturday, which is when the least amount of flights are scheduled (33 on average).

How much does it cost for a return flight from Chicago to Seattle?

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

Booking 90 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.

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 45 inbound flights from Chicago per day.

  • How long is the flight from Chicago to Seattle?

    Departing from Chicago to Seattle will take you 4h 32m. 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 Korean Air (83%), Avianca (82%) and Alaska Airlines (81%).

  • What are the cheapest flights from Chicago to Seattle?

    While on average a flight from Chicago to Seattle is generally £415, our data shows the cheapest flight currently is £228. When looking at the most popular route, (Chicago O'Hare Intl - Seattle/Tacoma Intl), you can expect to pay £234 for that flight.

  • 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, January is the cheapest month in which you can book a flight from Chicago to Seattle (average of £66). Flying from Chicago to Seattle in February is currently the most expensive (average of £478). 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

Fly with Cheapflights

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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?

Cheapflights taps into our reliable network of hundreds of airlines and travel agencies to find the best deals for flights from Chicago to Seattle for you. Better yet — we are completely free to use.

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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