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Cheap flights from Chicago to Seattle from £68

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 27/11. Fares are subject to change and may not be available on all flights or dates of travel.
CHI — SEA
21 Dec — 28 Dec1
1 adult
1 adult, Economy, 0 bags

Cheapflights Tip: The best prices from Chicago to Seattle/Tacoma Intl are usually found in February or April, booked 85 days in advance, depart on a Wednesday or Thursday and return on a Monday

Cheap 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 21 November 2025.

Round-trip from

£135

One-way from

£68

Popular in

December

Cheapest in

February

Average price

£218

Good round-trip deal

£379 or less
Delta
  • Delta
  • 9/1-16/1
  • Nonstop
  • 8h 43m total
  • Chicago to Seattle
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United Airlines
  • United Airlines
  • 27/11
  • Nonstop
  • 4h 40m total
  • Chicago to Seattle
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Highest demand for flights based on searches. 6% potential increase in price (£12 potential increase over avg. return price).
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Cheapest flight prices on average. 2% potential price decrease (£4 potential savings vs. average return price).
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Average for round-trip flights in November 2025
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Price to beat on a round-trip flight from Chicago (CHI) to Seattle/Tacoma Intl.
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Find 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 21 November 2025.

Wed 24/1218:08ORD - SEA
Nonstop4h 50mAlaska Airlines
Wed 31/1217:49SEA - ORD
Nonstop4h 10mAlaska Airlines
Deal found 19/11£135
Sat 6/1214:10ORD - SEA
Nonstop4h 42mDelta
Mon 8/1217:55SEA - ORD
Nonstop4h 04mDelta
Deal found 19/11£137
Fri 12/1214:14ORD - SEA
Nonstop4h 46mDelta
Tue 16/1217:55SEA - ORD
Nonstop4h 04mDelta
Deal found 19/11£138
Wed 3/1207:50ORD - SEA
Nonstop4h 51mDelta
Tue 9/1211:50SEA - ORD
1 stop6h 45mDelta
Deal found 19/11£138
Thu 11/1213:35ORD - SEA
1 stop7h 01mDelta
Tue 16/1206:00SEA - ORD
1 stop6h 59mDelta
Deal found 19/11£140
Thu 18/1219:55ORD - SEA
Nonstop4h 52mUnited Airlines
Fri 16/107:00SEA - ORD
Nonstop4h 08mUnited Airlines
Deal found 19/11£143
Mon 8/1218:10ORD - SEA
Nonstop4h 40mDelta
Fri 12/1207:20SEA - ORD
Nonstop4h 13mDelta
Deal found 19/11£144
Wed 10/1217:51ORD - SEA
Nonstop4h 44mAlaska Airlines
Wed 10/1200:18SEA - ORD
Nonstop4h 03mAlaska Airlines
Deal found 19/11£146
Fri 12/1217:42ORD - SEA
1 stop8h 42mDelta
Mon 15/1223:15SEA - ORD
1 stop6h 49mDelta
Deal found 19/11£153

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 21 November 2025.
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

Fri 9/1

07:30-10:15

Nonstop4h 45m

Seattle/Tacoma Intl

Fri 16/1

17:55-23:53

Nonstop3h 58m

£135

ChicagoSeattle

ORD - SEA

ORDSEA

Chicago O'Hare Intl

Thu 5/2

08:00-10:46

Nonstop4h 46m

Seattle/Tacoma Intl

Sun 8/2

08:30-14:38

Nonstop4h 08m

£135

ChicagoSeattle

ORD - SEA

ORDSEA

Chicago O'Hare Intl

Mon 2/3

14:20-17:00

Nonstop4h 40m

Seattle/Tacoma Intl

Fri 6/3

17:58-23:55

Nonstop3h 57m

£135

ChicagoSeattle

ORD - SEA

ORDSEA

Chicago O'Hare Intl

Sat 14/2

15:54-18:40

Nonstop4h 46m

Seattle/Tacoma Intl

Wed 18/2

17:55-23:56

Nonstop4h 01m

£135

ChicagoSeattle

ORD - SEA

ORDSEA

Chicago O'Hare Intl

Sat 6/12

14:10-16:52

Nonstop4h 42m

Seattle/Tacoma Intl

Mon 8/12

17:55-23:59

Nonstop4h 04m

£137

ChicagoSeattle

ORD - SEA

ORDSEA

Chicago O'Hare Intl

Fri 27/2

19:59-22:43

Nonstop4h 44m

Seattle/Tacoma Intl

Mon 2/3

12:37-23:26

1 stop8h 49m

£140

ChicagoSeattle

ORD - SEA

ORDSEA

Chicago O'Hare Intl

Thu 5/2

06:50-14:21

1 stop9h 31m

Seattle/Tacoma Intl

Mon 9/2

23:10-09:41

1 stop8h 31m

£140

ChicagoSeattle

ORD - SEA

ORDSEA

Chicago O'Hare Intl

Thu 8/1

18:06-20:56

Nonstop4h 50m

Seattle/Tacoma Intl

Sun 11/1

21:45-13:10

1 stop13h 25m

£143

ChicagoSeattle

ORD - SEA

ORDSEA

Chicago O'Hare Intl

Fri 12/12

14:14-17:00

Nonstop4h 46m

Seattle/Tacoma Intl

Tue 16/12

07:20-13:33

Nonstop4h 13m

£151

ChicagoSeattle

ORD - SEA

ORDSEA

Chicago O'Hare Intl

Tue 6/1

14:20-17:00

Nonstop4h 40m

Seattle/Tacoma Intl

Fri 9/1

11:25-21:52

1 stop8h 27m

£151

Flights are sorted by cheapest return flights first.

Deals found on 20/11

Showing 1-10 of 22 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 14 November 2025.

Booking 85 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, November is the cheapest month in which you can book a flight from Chicago to Seattle (average of £86). Flying from Chicago to Seattle in December is currently the most expensive (average of £135). 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 21 November 2025.

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 54% 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 21 November 2025.

The most flights from CHI to SEA are scheduled on a Thursday (44 on average). You will have fewer flight options on Monday, which is when the least amount of flights are scheduled (13 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 21 inbound flights from Chicago per day.

  • How long is the flight from Chicago to Seattle?

    Departing from Chicago to Seattle will take you 4h 45m. The distance between Chicago and Seattle is about 1715 mi. Generally, flights for this route are direct.

  • What are the cheapest airlines to fly from Chicago to Seattle one-way?

    £68 is the cheapest one-way deal found within the past few days, from United Airlines. You may also be able to find cheap deals on Delta and Southwest, with prices starting from £70 and £75, respectively.

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

    The top 3 most reliable airlines when flying from Chicago to Seattle are United Airlines (89%), Air France (88%) and American Airlines (81%).

  • What are the cheapest flights from Chicago to Seattle?

    While on average a flight from Chicago to Seattle is generally £990, our data shows the cheapest flight currently is £253. When looking at the most popular route, (Chicago O'Hare Intl - Seattle/Tacoma Intl), you can expect to pay £225 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, November is the cheapest month in which you can book a flight from Chicago to Seattle (average of £86). Flying from Chicago to Seattle in December is currently the most expensive (average of £135). 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
Leavenworth
Bothell
SeaTac

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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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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.

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