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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 16/9. Fares are subject to change and may not be available on all flights or dates of travel.
CHI — SEA
20 Jul — 27 Jul1
1 adult

Cheapflights Tip: The best prices from Chicago to Seattle/Tacoma Intl are usually found in February or September, booked 62 days in advance, depart on a Wednesday or Tuesday 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 15 July 2025.

Round-trip from

£136

One-way from

£71

Popular in

December

Cheapest in

February

Average price

£244
Alaska Airlines
  • Alaska Airlines
  • 6/9-6/9
  • Nonstop
  • 8h 42m total
  • Chicago to Seattle
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Hawaiian Airlines
  • Hawaiian Airlines
  • 16/9
  • Nonstop
  • 4h 32m total
  • Chicago to Seattle
Search Deals
Highest demand for flights based on searches. 5% potential increase in price (£8 potential increase over avg. return price).
Search Deals
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 July 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 15 July 2025.

Sat 6/910:00ORD - SEA
Nonstop4h 34mAlaska Airlines
Sat 6/915:59SEA - ORD
Nonstop4h 08mAlaska Airlines
Deal found 14/7£136
Sat 30/806:20ORD - SEA
Nonstop4h 30mHawaiian Airlines
Sat 6/917:55SEA - ORD
Nonstop4h 08mHawaiian Airlines
Deal found 15/7£137
Tue 23/916:10ORD - SEA
Nonstop4h 39mUnited Airlines
Tue 30/913:00SEA - ORD
1 stop8h 12mUnited Airlines
Deal found 14/7£145
Sat 23/815:10ORD - SEA
1 stop8h 20mSouthwest
Sat 30/808:10SEA - ORD
1 stop7h 45mSouthwest
Deal found 14/7£151
Wed 20/807:15ORD - SEA
Nonstop4h 30mDelta
Sun 24/807:10SEA - ORD
Nonstop4h 07mDelta
Deal found 14/7£169
Fri 29/806:50ORD - SEA
Nonstop4h 29mAmerican Airlines
Fri 5/915:00SEA - ORD
Nonstop4h 02mAmerican Airlines
Deal found 14/7£193
Thu 28/821:45ORD - SEA
1 stop18h 55mFrontier
Thu 4/906:12SEA - ORD
1 stop15h 47mFrontier
Deal found 14/7£206

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 15 July 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 6/9

10:00-12:34

Nonstop4h 34m

Seattle/Tacoma Intl

Sat 6/9

15:59-22:07

Nonstop4h 08m

£136

ChicagoSeattle

ORD - SEA

ORDSEA

Chicago O'Hare Intl

Sat 30/8

06:20-08:50

Nonstop4h 30m

Seattle/Tacoma Intl

Sat 6/9

17:55-00:03

Nonstop4h 08m

£137

ChicagoSeattle

ORD - SEA

ORDSEA

Chicago O'Hare Intl

Tue 23/9

16:10-18:49

Nonstop4h 39m

Seattle/Tacoma Intl

Tue 30/9

13:00-23:12

1 stop8h 12m

£145

ChicagoSeattle

ORD - SEA

ORDSEA

Chicago O'Hare Intl

Sat 23/8

15:10-21:30

1 stop8h 20m

Seattle/Tacoma Intl

Sat 30/8

08:10-17:55

1 stop7h 45m

£151

ChicagoSeattle

ORD - SEA

ORDSEA

Chicago O'Hare Intl

Wed 20/8

07:15-09:45

Nonstop4h 30m

Seattle/Tacoma Intl

Sun 24/8

07:10-13:17

Nonstop4h 07m

£169

ChicagoSeattle

ORD - SEA

ORDSEA

Chicago O'Hare Intl

Fri 29/8

06:50-09:19

Nonstop4h 29m

Seattle/Tacoma Intl

Fri 5/9

15:00-21:02

Nonstop4h 02m

£193

ChicagoSeattle

ORD - SEA

ORDSEA

Chicago O'Hare Intl

Thu 28/8

21:45-14:40

1 stop18h 55m

Seattle/Tacoma Intl

Thu 4/9

06:12-23:59

1 stop15h 47m

£206

ChicagoSeattle

ORD - SEA

ORDSEA

Chicago O'Hare Intl

Tue 16/9

17:45-20:17

Nonstop4h 32m

£71

ChicagoSeattle

ORD - SEA

ORDSEA

Chicago O'Hare Intl

Tue 9/9

06:00-13:03

1 stop9h 03m

£74

ChicagoSeattle

ORD - SEA

ORDSEA

Chicago O'Hare Intl

Sat 18/10

06:15-14:55

1 stop10h 40m

£77

Flights are sorted by cheapest return flights first.

Deals found on 14/7

Showing 1-10 of 14 results
1
2

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 11 July 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 15 July 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 afternoon, which can drop the price by up to 39% versus a flight at midday.

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 15 July 2025.

The most flights from CHI to SEA are scheduled on a Monday (79 on average). You will have fewer flight options on Tuesday, which is when the least amount of flights are scheduled (39 on average).

Reviews of airlines servicing Seattle

Get insights into the airlines that provide service to Seattle. Read reviews, discover amenities, and learn about the overall travel experience offered by airlines. Use this information to make informed decisions when choosing an airline for your flight to Seattle. Reviews last updated 15 July 2025.
Read through reviews of airlines operating flights from Chicago to Seattle, such as Alaska Airlines, Southwest, andDelta. Reviews also offer insight into each airline's entertainment options, comfort, food, crew/service, and boarding process.
Alaska Airlines
8.0
Very Good
10,000 reviews
Check prices

Entertainment

7.1

Overall

8.0

Crew

8.5

Boarding

8.1

Comfort

7.8

Food

7.1

Reviews

1 / 20
10.0
Excellent

Anonymous,Jul 2025

EUG - SEA

Mobility support was fabulous No flight entertainment that I was aware of.
Alaska Airlines
8.0
Very Good
10,000 reviews
Alaska Airlines
8.0
Very Good
10,000 reviews
Check prices

Entertainment

7.1

Overall

8.0

Crew

8.5

Boarding

8.1

Comfort

7.8

Food

7.1

Reviews

1 / 20
10.0
Excellent

Anonymous,Jul 2025

EUG - SEA

Mobility support was fabulous No flight entertainment that I was aware of.
Southwest
8.0
Very Good
4,242 reviews
Alaska Airlines
8.0
Very Good
10,000 reviews
Check prices

Entertainment

7.1

Overall

8.0

Crew

8.5

Boarding

8.1

Comfort

7.8

Food

7.1

Reviews

1 / 20
10.0
Excellent

Anonymous,Jul 2025

EUG - SEA

Mobility support was fabulous No flight entertainment that I was aware of.
Delta
8.0
Very Good
7,956 reviews
Alaska Airlines
8.0
Very Good
10,000 reviews
Check prices

Entertainment

7.1

Overall

8.0

Crew

8.5

Boarding

8.1

Comfort

7.8

Food

7.1

Reviews

1 / 20
10.0
Excellent

Anonymous,Jul 2025

EUG - SEA

Mobility support was fabulous No flight entertainment that I was aware of.
Hawaiian Airlines
7.8
Good
2,571 reviews
Alaska Airlines
8.0
Very Good
10,000 reviews
Check prices

Entertainment

7.1

Overall

8.0

Crew

8.5

Boarding

8.1

Comfort

7.8

Food

7.1

Reviews

1 / 20
10.0
Excellent

Anonymous,Jul 2025

EUG - SEA

Mobility support was fabulous No flight entertainment that I was aware of.
United Airlines
7.4
Good
8,858 reviews
Alaska Airlines
8.0
Very Good
10,000 reviews
Check prices

Entertainment

7.1

Overall

8.0

Crew

8.5

Boarding

8.1

Comfort

7.8

Food

7.1

Reviews

1 / 20
10.0
Excellent

Anonymous,Jul 2025

EUG - SEA

Mobility support was fabulous No flight entertainment that I was aware of.

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 61 inbound flights from Chicago per day.

  • What are the cheapest airlines flying from Chicago to Seattle round-trip?

    According to our current data, Alaska Airlines (£136), Hawaiian Airlines (£140), and United Airlines (£145) offers the cheapest pricing from Chicago to Seattle. Alaska Airlines is currently priced 33% below the average price you’ll pay for this route.

  • 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 Hawaiian Airlines. You may also be able to find cheap deals on United Airlines and Southwest, with prices starting from £74 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 Austrian Airlines (85%), Brussels Airlines (83%) and Air France (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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