Find flights
Deals
When to book
FAQs

Cheap flights from Chicago to Seattle from £88

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 18/3. Fares are subject to change and may not be available on all flights or dates of travel.
CHI — SEA
22 Mar — 29 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 20 February 2026.

Tue 17/307:00
ORD
-
SEA
Nonstop4h 51m
Alaska Airlines
Tue 17/312:56
SEA
-
ORD
1 stop9h 03m
Alaska Airlines
Deal found 18/2£143
Tue 21/416:10
ORD
-
SEA
1 stop31h 35m
Alaska Airlines
Wed 22/400:29
SEA
-
ORD
Nonstop4h 11m
Alaska Airlines
Deal found 17/2£150
Wed 29/408:50
ORD
-
SEA
1 stop14h 55m
Alaska Airlines
Wed 29/400:29
SEA
-
ORD
Nonstop4h 11m
Alaska Airlines
Deal found 19/2£154
Sat 25/408:50
ORD
-
SEA
1 stop14h 55m
Alaska Airlines
Sat 25/400:29
SEA
-
ORD
Nonstop4h 11m
Alaska Airlines
Deal found 18/2£170
Tue 21/419:24
ORD
-
SEA
Nonstop4h 41m
Alaska Airlines
Tue 21/400:29
SEA
-
ORD
Nonstop4h 11m
Alaska Airlines
Deal found 18/2£171
Tue 21/407:15
ORD
-
SEA
Nonstop4h 49m
Delta
Wed 29/410:35
SEA
-
ORD
Nonstop4h 04m
Delta
Deal found 19/2£174
Tue 17/320:01
ORD
-
SEA
Nonstop4h 44m
United Airlines
Tue 24/312:36
SEA
-
ORD
1 stop9h 02m
United Airlines
Deal found 17/2£179
Tue 21/414:09
ORD
-
SEA
1 stop9h 15m
Alaska Airlines
Fri 24/400:29
SEA
-
ORD
Nonstop4h 11m
Alaska Airlines
Deal found 19/2£182
Thu 23/408:50
ORD
-
SEA
1 stop14h 55m
Alaska Airlines
Thu 23/400:29
SEA
-
ORD
Nonstop4h 11m
Alaska Airlines
Deal found 17/2£183
Wed 22/406:00
ORD
-
SEA
Nonstop4h 32m
Alaska Airlines
Wed 29/409:07
SEA
-
ORD
1 stop7h 56m
Alaska Airlines
Deal found 19/2£186
Tue 24/319:24
ORD
-
SEA
Nonstop4h 41m
Alaska Airlines
Tue 24/300:35
SEA
-
ORD
Nonstop4h 04m
Alaska Airlines
Deal found 19/2£186

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 20 February 2026.

Round-trip from

£143

One-way from

£88

Popular in

June

Cheapest in

January

Average price

£175
Alaska Airlines
  • Alaska Airlines
  • 17/3-17/3
  • 1 total stop
  • 13h 54m total
  • Chicago to Seattle
Search Deals
Delta
  • Delta
  • 29/4
  • Nonstop
  • 4h 43m total
  • Chicago to Seattle
Search Deals
Highest demand for flights based on searches. 9% potential increase in price (£15 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
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 20 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

Sat 25/4

08:50-21:45

1 stop14h 55m

Seattle/Tacoma Intl

Sat 25/4

00:29-06:40

Nonstop4h 11m

£172

ChicagoSeattle

ORD - SEA

ORDSEA

Chicago O'Hare Intl

Wed 6/5

19:59-22:42

Nonstop4h 43m

Seattle/Tacoma Intl

Tue 12/5

23:48-05:49

Nonstop4h 01m

£174

ChicagoSeattle

ORD - SEA

ORDSEA

Chicago O'Hare Intl

Tue 17/3

15:07-23:40

1 stop10h 33m

Seattle/Tacoma Intl

Tue 24/3

00:35-06:39

Nonstop4h 04m

£182

ChicagoSeattle

ORD - SEA

ORDSEA

Chicago O'Hare Intl

Wed 18/3

07:25-10:05

Nonstop4h 40m

Seattle/Tacoma Intl

Mon 23/3

23:59-21:26

1 stop19h 27m

£192

ChicagoSeattle

ORD - SEA

ORDSEA

Chicago O'Hare Intl

Sat 7/3

07:40-10:25

Nonstop4h 45m

Seattle/Tacoma Intl

Tue 10/3

18:45-00:39

Nonstop3h 54m

£197

ChicagoSeattle

ORD - SEA

ORDSEA

Chicago O'Hare Intl

Tue 5/5

07:15-10:04

Nonstop4h 49m

Seattle/Tacoma Intl

Tue 26/5

17:47-23:59

Nonstop4h 12m

£197

ChicagoSeattle

ORD - SEA

ORDSEA

Chicago O'Hare Intl

Wed 11/3

15:07-22:39

1 stop9h 32m

Seattle/Tacoma Intl

Wed 18/3

09:07-15:14

Nonstop4h 07m

£197

ChicagoSeattle

ORD - SEA

ORDSEA

Chicago O'Hare Intl

Thu 16/4

06:25-23:54

1 stop19h 29m

Seattle/Tacoma Intl

Tue 21/4

10:35-16:39

Nonstop4h 04m

£200

ChicagoSeattle

ORD - SEA

ORDSEA

Chicago O'Hare Intl

Fri 8/5

21:15-23:57

Nonstop4h 42m

Seattle/Tacoma Intl

Tue 12/5

13:21-23:29

1 stop8h 08m

£204

ChicagoSeattle

ORD - SEA

ORDSEA

Chicago O'Hare Intl

Tue 5/5

08:50-17:32

1 stop10h 42m

Seattle/Tacoma Intl

Sun 24/5

17:42-23:59

Nonstop4h 17m

£204

Flights are sorted by cheapest return flights first.

Deals found on 19/2

Showing 1-10 of 21 results
1
2
3

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 18 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 £84). Flying from Chicago to Seattle in December is currently the most expensive (average of £132). 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 20 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 20 February 2026.

The most flights from CHI to SEA are scheduled on a Thursday (42 on average). You will have fewer flight options on Saturday, which is when the least amount of flights are scheduled (27 on average).

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

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 33 inbound flights from Chicago per day.

  • How long is the flight from Chicago to Seattle?

    Departing from Chicago to Seattle will take you 4h 40m. The distance between Chicago and Seattle is about 1715 mi. Both multi-stop and direct flights can be found to your destination and back.

  • 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 (82%), Austrian Airlines (77%) and Lufthansa (74%).

  • 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 £84). Flying from Chicago to Seattle in December is currently the most expensive (average of £132). 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

Toggle through the tabs below to find thousands of options on Cheapflights for your next trip.

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

Find the best flight deals on Cheapflights, where travellers can enjoy low prices and a wide availability of flights to their desired destinations.

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

900+ travel sites are searched through when a user searches for a flight using Cheapflights. From the search interface, users can use filters to choose airlines, airports, flight times, cabin classes and more to their preference. Book your flight to Seattle from Chicago today with Cheapflights!

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!

100% Free

Cheapflights is completely free to use, so you can start saving the moment you arrive.

Book with Flexibility

Our users can plan ahead with confidence and find flights with no change fees

Travel Smart

Millions of people come to us for their flight needs every year. We help make travel planning easy by providing useful insights and data-driven graphs that can inform your decisions.