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Cheap flights from Chicago to Seattle from £71

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 20/9. Fares are subject to change and may not be available on all flights or dates of travel.
CHI — SEA
26 Aug — 2 Sep1
1 adult

Cheapflights Tip: The best prices from Chicago to Seattle/Tacoma Intl are usually found in February or April, booked 62 days in advance, depart on a Tuesday or Wednesday and return on a Tuesday

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 August 2025.

Round-trip from

£130

One-way from

£71

Popular in

December

Cheapest in

February

Average price

£215
Alaska Airlines
  • Alaska Airlines
  • 3/12-3/12
  • 1 total stop
  • 18h 31m total
  • Chicago to Seattle
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Delta
  • Delta
  • 20/9
  • Nonstop
  • 4h 35m total
  • Chicago to Seattle
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Highest demand for flights based on searches. 5% potential increase in price (£8 potential increase over avg. return price).
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Cheapest flight prices on average. 3% potential price decrease (£5 potential savings vs. average return price).
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Average for round-trip flights in August 2025
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Find flight deals from Chicago to Seattle

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 August 2025.

Wed 3/1209:15ORD - SEA
1 stop14h 28mAlaska Airlines
Wed 3/1200:18SEA - ORD
Nonstop4h 03mAlaska Airlines
Deal found 19/8£130
Sun 31/807:15ORD - SEA
Nonstop4h 30mDelta
Sat 6/917:50SEA - ORD
Nonstop4h 01mDelta
Deal found 21/8£133
Wed 29/1010:00ORD - SEA
Nonstop4h 39mAlaska Airlines
Wed 29/1015:31SEA - ORD
Nonstop4h 09mAlaska Airlines
Deal found 20/8£136
Sat 6/918:13ORD - SEA
Nonstop4h 37mDelta
Tue 16/917:55SEA - ORD
Nonstop4h 00mDelta
Deal found 21/8£137
Sat 18/1006:00ORD - SEA
Nonstop4h 27mHawaiian Airlines
Sat 25/1017:55SEA - ORD
Nonstop4h 11mHawaiian Airlines
Deal found 19/8£138
Sat 18/1006:00ORD - SEA
Nonstop4h 27mAlaska Airlines
Fri 24/1000:17SEA - ORD
Nonstop4h 07mAlaska Airlines
Deal found 21/8£138
Sat 13/907:10ORD - SEA
Nonstop4h 35mDelta
Sat 20/917:59SEA - ORD
Nonstop4h 00mDelta
Deal found 19/8£141
Sat 25/1015:50ORD - SEA
1 stop9h 16mAlaska Airlines
Fri 31/1015:31SEA - ORD
Nonstop4h 09mAlaska Airlines
Deal found 19/8£144
Wed 1/1016:10ORD - SEA
Nonstop4h 39mUnited Airlines
Tue 7/1013:00SEA - ORD
1 stop8h 12mUnited Airlines
Deal found 20/8£145
Thu 4/1215:05ORD - SEA
1 stop8h 38mAlaska Airlines
Thu 4/1200:18SEA - ORD
Nonstop4h 03mAlaska Airlines
Deal found 19/8£150
Wed 22/1008:20ORD - SEA
1 stop15h 12mAlaska Airlines
Wed 22/1000:17SEA - ORD
Nonstop4h 07mAlaska Airlines
Deal found 20/8£152

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 August 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

Wed 3/12

09:15-21:43

1 stop14h 28m

Seattle/Tacoma Intl

Wed 3/12

00:18-06:21

Nonstop4h 03m

£130

ChicagoSeattle

ORD - SEA

ORDSEA

Chicago O'Hare Intl

Sun 31/8

07:15-09:45

Nonstop4h 30m

Seattle/Tacoma Intl

Sat 6/9

17:50-23:51

Nonstop4h 01m

£133

ChicagoSeattle

ORD - SEA

ORDSEA

Chicago O'Hare Intl

Sat 25/10

10:05-12:45

Nonstop4h 40m

Seattle/Tacoma Intl

Fri 31/10

15:31-21:40

Nonstop4h 09m

£137

ChicagoSeattle

ORD - SEA

ORDSEA

Chicago O'Hare Intl

Thu 27/11

07:30-10:17

Nonstop4h 47m

Seattle/Tacoma Intl

Tue 9/12

07:20-13:28

Nonstop4h 08m

£137

ChicagoSeattle

ORD - SEA

ORDSEA

Chicago O'Hare Intl

Sat 6/9

18:13-20:50

Nonstop4h 37m

Seattle/Tacoma Intl

Sat 20/9

17:59-23:59

Nonstop4h 00m

£137

ChicagoSeattle

ORD - SEA

ORDSEA

Chicago O'Hare Intl

Sat 6/9

18:13-20:50

Nonstop4h 37m

Seattle/Tacoma Intl

Wed 17/9

17:55-23:55

Nonstop4h 00m

£137

ChicagoSeattle

ORD - SEA

ORDSEA

Chicago O'Hare Intl

Sat 6/9

18:13-20:50

Nonstop4h 37m

Seattle/Tacoma Intl

Tue 16/9

17:55-23:55

Nonstop4h 00m

£137

ChicagoSeattle

ORD - SEA

ORDSEA

Chicago O'Hare Intl

Wed 3/9

07:15-09:45

Nonstop4h 30m

Seattle/Tacoma Intl

Sat 13/9

17:59-23:59

Nonstop4h 00m

£137

ChicagoSeattle

ORD - SEA

ORDSEA

Chicago O'Hare Intl

Tue 7/10

08:00-10:40

Nonstop4h 40m

Seattle/Tacoma Intl

Tue 14/10

17:50-23:59

Nonstop4h 09m

£141

ChicagoSeattle

ORD - SEA

ORDSEA

Chicago O'Hare Intl

Sat 27/9

13:08-15:45

Nonstop4h 37m

£71

Flights are sorted by cheapest return flights first.

Deals found on 20/8

Showing 1-10 of 19 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 8 August 2025.

Booking 52 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, January is the cheapest month in which you can book a flight from Chicago to Seattle (average of £622). Flying from Chicago to Seattle in July is currently the most expensive (average of £946). 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 August 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 at midday, which can drop the price by up to 27% 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 21 August 2025.

The most flights from CHI to SEA are scheduled on a Thursday (70 on average). You will have fewer flight options on Saturday, which is when the least amount of flights are scheduled (29 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 46 inbound flights from Chicago per day.

  • How long is the flight from Chicago to Seattle?

    Departing from Chicago to Seattle will take you 4h 30m. 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 cheapest airlines to fly from Chicago to Seattle one-way?

    £71 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 Hawaiian Airlines and Delta, with prices starting from £71 and £71, respectively.

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

    The top 3 most reliable airlines when flying from Chicago to Seattle are Air France (87%), Delta (86%) and KLM (83%).

  • 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 £622). Flying from Chicago to Seattle in July is currently the most expensive (average of £946). 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

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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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.

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