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Cheap flights from Chicago to Seattle from £73

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 17/1. Fares are subject to change and may not be available on all flights or dates of travel.
CHI — SEA
18 Oct — 25 Oct1
1 adult
1 adult, Economy

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 18 September 2025.

Round-trip from

£128

One-way from

£73

Popular in

December

Cheapest in

February

Average price

£182

Good one-way deal

£96 or less
Delta
  • Delta
  • 18/10-21/10
  • 2 total stops
  • 13h 42m total
  • Chicago to Seattle
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Southwest
  • Southwest
  • 17/1
  • 1 total stop
  • 9h 20m total
  • Chicago to Seattle
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Highest demand for flights based on searches. 6% potential increase in price (£9 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 September 2025
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Price to beat on a one-way flight from Chicago (CHI) to Seattle/Tacoma Intl.
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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 18 September 2025.

Sat 18/1016:56ORD - SEA
1 stop7h 07mDelta
Tue 21/1023:15SEA - ORD
1 stop6h 35mDelta
Deal found 17/9£128
Tue 28/1008:00ORD - SEA
Nonstop4h 44mAlaska Airlines
Tue 28/1014:03SEA - ORD
1 stop7h 56mAlaska Airlines
Deal found 16/9£131
Wed 15/1016:10ORD - SEA
Nonstop4h 39mUnited Airlines
Thu 16/1016:47SEA - ORD
Nonstop4h 00mUnited Airlines
Deal found 16/9£133
Wed 19/1107:47ORD - SEA
Nonstop4h 53mDelta
Sat 22/1117:51SEA - ORD
Nonstop4h 07mDelta
Deal found 16/9£133
Tue 21/1008:20ORD - SEA
1 stop15h 12mAlaska Airlines
Tue 21/1000:17SEA - ORD
Nonstop4h 07mAlaska Airlines
Deal found 16/9£136
Fri 10/1007:10ORD - SEA
Nonstop4h 33mUnited Airlines
Sun 12/1016:47SEA - ORD
Nonstop4h 00mUnited Airlines
Deal found 16/9£136
Sat 18/1007:05ORD - SEA
1 stop7h 02mFrontier
Sat 25/1020:43SEA - ORD
1 stop10h 53mFrontier
Deal found 16/9£138
Sat 1/1110:00ORD - SEA
Nonstop4h 39mMultiple Airlines
Sat 8/1112:58SEA - ORD
1 stop8h 31mMultiple Airlines
Deal found 17/9£140
Wed 15/1006:15ORD - SEA
1 stop7h 47mUnited Airlines
Sat 18/1016:47SEA - ORD
Nonstop4h 00mUnited Airlines
Deal found 16/9£141
Fri 31/1015:25ORD - SEA
Nonstop4h 39mHawaiian Airlines
Tue 4/1118:15SEA - ORD
Nonstop4h 09mHawaiian Airlines
Deal found 17/9£142
Thu 16/1007:37ORD - SEA
Nonstop4h 38mDelta
Thu 23/1007:25SEA - ORD
Nonstop4h 05mDelta
Deal found 16/9£144
Wed 8/1008:45ORD - SEA
Nonstop4h 46mUnited Airlines
Mon 13/1007:00SEA - ORD
Nonstop4h 15mUnited Airlines
Deal found 16/9£147

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 18 September 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

Sat 18/10

16:56-22:03

1 stop7h 07m

Seattle/Tacoma Intl

Tue 21/10

23:15-07:50

1 stop6h 35m

£128

ChicagoSeattle

ORD - SEA

ORDSEA

Chicago O'Hare Intl

Wed 15/10

16:10-18:49

Nonstop4h 39m

Seattle/Tacoma Intl

Thu 16/10

16:47-22:47

Nonstop4h 00m

£133

ChicagoSeattle

ORD - SEA

ORDSEA

Chicago O'Hare Intl

Tue 25/11

06:00-08:37

Nonstop4h 37m

Seattle/Tacoma Intl

Thu 27/11

10:53-17:06

Nonstop4h 13m

£142

ChicagoSeattle

ORD - SEA

ORDSEA

Chicago O'Hare Intl

Fri 31/10

17:53-20:35

Nonstop4h 42m

Seattle/Tacoma Intl

Tue 4/11

18:15-00:24

Nonstop4h 09m

£142

ChicagoSeattle

ORD - SEA

ORDSEA

Chicago O'Hare Intl

Thu 16/10

07:37-10:15

Nonstop4h 38m

Seattle/Tacoma Intl

Thu 23/10

07:25-13:30

Nonstop4h 05m

£144

ChicagoSeattle

ORD - SEA

ORDSEA

Chicago O'Hare Intl

Tue 28/10

10:00-12:39

Nonstop4h 39m

Seattle/Tacoma Intl

Tue 28/10

15:31-21:40

Nonstop4h 09m

£149

ChicagoSeattle

ORD - SEA

ORDSEA

Chicago O'Hare Intl

Sat 18/10

06:00-08:27

Nonstop4h 27m

Seattle/Tacoma Intl

Tue 21/10

17:50-23:59

Nonstop4h 09m

£153

ChicagoSeattle

ORD - SEA

ORDSEA

Chicago O'Hare Intl

Tue 4/11

10:00-12:39

Nonstop4h 39m

Seattle/Tacoma Intl

Mon 10/11

00:20-06:22

Nonstop4h 02m

£153

ChicagoSeattle

ORD - SEA

ORDSEA

Chicago O'Hare Intl

Wed 15/10

06:00-08:27

Nonstop4h 27m

Seattle/Tacoma Intl

Wed 15/10

17:50-23:59

Nonstop4h 09m

£153

ChicagoSeattle

ORD - SEA

ORDSEA

Chicago O'Hare Intl

Thu 27/11

12:59-15:47

Nonstop4h 48m

Seattle/Tacoma Intl

Fri 28/11

00:25-06:28

Nonstop4h 03m

£157

Flights are sorted by cheapest return flights first.

Deals found on 16/9

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 12 September 2025.

Booking 62 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 18 September 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 38% 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 18 September 2025.

The most flights from CHI to SEA are scheduled on a Tuesday (59 on average). You will have fewer flight options on Saturday, which is when the least amount of flights are scheduled (38 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 51 inbound flights from Chicago per day.

  • How long is the flight from Chicago to Seattle?

    Departing from Chicago to Seattle will take you 4h 37m. 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?

    £77 is the cheapest one-way deal found within the past few days, from Alaska Airlines. You may also be able to find cheap deals on United Airlines and Delta, with prices starting from £77 and £77, 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 (88%), Delta (82%) and KLM (75%).

  • What are the cheapest flights from Chicago to Seattle?

    While on average a flight from Chicago to Seattle is generally £96, our data shows the cheapest flight currently is £95. When looking at the most popular route, (Chicago O'Hare Intl - Seattle/Tacoma Intl), you can expect to pay £152 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 £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

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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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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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