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$63+ Cheap flights from Illinois to Washington

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 1/7. Fares are subject to change and may not be available on all flights or dates of travel.
ORD — SEA
Jan 14 — Jan 211
Wed 1/14
Wed 1/21
1 adult, Economy
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Cheap flight deals from Illinois to Washington

Cheapest flights from Illinois to Washington
Explore the most affordable flight options available from Illinois to Washington. Find the lowest fares from popular airlines and budget airlines, with prices last updated on December 15, 2025.

This CheapOair deal was found by Cheapflights users on 12/14. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure CheapOair is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 12/247:43 pmSTL - SEA
1 stop18h 47mFrontier
Thu 1/11:25 pmSEA - STL
1 stop18h 37mFrontier
Deal found 12/14$255
This Delta deal was found by Cheapflights users on 12/12. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 12/315:59 pmMDW - GEG
1 stop7h 17mDelta
Tue 1/1312:55 pmGEG - MDW
1 stop7h 12mDelta
Deal found 12/12$255
This Delta deal was found by Cheapflights users on 12/14. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 12/256:00 amORD - GEG
1 stop6h 41mDelta
Thu 1/1512:55 pmGEG - ORD
1 stop9h 04mDelta
Deal found 12/14$272
This Delta deal was found by Cheapflights users on 12/12. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 12/315:59 pmMDW - GEG
1 stop7h 17mDelta
Sat 1/106:30 amGEG - MDW
1 stop7h 46mDelta
Deal found 12/12$272
This Delta deal was found by Cheapflights users on 12/12. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 12/315:59 pmMDW - GEG
1 stop7h 17mDelta
Mon 1/1212:55 pmGEG - MDW
1 stop7h 12mDelta
Deal found 12/12$275
This CheapOair deal was found by Cheapflights users on 12/14. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure CheapOair is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 12/2110:10 pmSTL - SEA
1 stop14h 01mFrontier
Mon 12/296:33 pmSEA - STL
1 stop24h 52mFrontier
Deal found 12/14$279
This Delta deal was found by Cheapflights users on 12/12. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 12/315:59 pmMDW - GEG
1 stop7h 17mDelta
Wed 1/146:30 amGEG - MDW
2 stops9h 04mDelta
Deal found 12/12$280
This Kiwi.com deal was found by Cheapflights users on 12/15. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 12/278:26 pmORD - SEA
1 stop22h 52mMultiple Airlines
Wed 12/315:49 pmSEA - ORD
Nonstop4h 10mMultiple Airlines
Deal found 12/15$286
This Southwest deal was found by Cheapflights users on 12/14. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 12/258:45 amMDW - SEA
1 stop9h 45mSouthwest
Wed 12/313:05 pmSEA - MDW
1 stop12h 00mSouthwest
Deal found 12/14$292
This Alaska Airlines deal was found by Cheapflights users on 12/13. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Alaska Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 12/296:00 amORD - SEA
Nonstop4h 45mAlaska Airlines
Fri 1/26:00 amSEA - ORD
Nonstop4h 13mAlaska Airlines
Deal found 12/13$297
This Southwest deal was found by Cheapflights users on 12/14. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 12/259:40 amMDW - SEA
1 stop11h 00mSouthwest
Mon 1/56:45 pmSEA - MDW
1 stop8h 20mSouthwest
Deal found 12/14$302
This United Airlines deal was found by Cheapflights users on 12/15. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 12/259:08 amORD - PDX
Nonstop4h 50mUnited Airlines
Wed 12/312:45 pmPDX - ORD
1 stop7h 14mUnited Airlines
Deal found 12/15$307

Find flight deals from Illinois to Washington

Keep the following information in mind while searching for Illinois to Washington flight deals. Data was last updated December 15, 2025.

Most accurate provider

CheapOair
3 stars

Most trusted provider

CheapOair
3 stars

Round-trip from

$167
(American Airlines)

One-way from

$63
(Trip.com)

Popular in

December

Cheapest in

February

Average price

$345

Good round-trip deal

$157 or less

Good one-way deal

$180 or less
Provider with most accurate pricing for Chicago (CHI)-Seattle/Tacoma Intl flight deals.
Search Deals
Provider most trusted by Cheapflights users for Chicago (CHI)-Seattle/Tacoma Intl flights.
Search Deals
From Illinois to Washington
Search Deals
One-way flight from Illinois to Washington
Search Deals
Highest demand for flights based on searches. 6% potential increase in price ($20 potential increase over avg. RT price).
Search Deals
Cheapest flight prices on average. 2% potential price decrease ($6 potential savings vs. average RT price).
Search Deals
Average for round-trip flights in December 2025
Search Deals
Price to beat on a round-trip flight from Illinois to Washington.
Search Deals
Price to beat on a one-way flight from Illinois to Washington.
Search Deals

Cheapflights Fare Finder

 
Customize your flight search to find flights from Illinois to Washington 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 2,558,603 searches. Data last updated December 15, 2025.
Use the filters below to find and compare flights from Illinois to Washington that are best for you.

Fly from

Illinois

Fly to

Washington

Route

Depart

Return

Price

ChicagoSeattle

MDW - SEA

MDWSEA

Chicago Midway

Tue 1/6

10:35 am-1:15 pm

Nonstop4h 40m

Seattle/Tacoma Intl

Sun 1/11

6:35 am-12:35 pm

Nonstop4h 00m

$177

ChicagoSeattle

ORD - SEA

ORDSEA

Chicago O'Hare Intl

Thu 1/8

1:20 pm-4:01 pm

Nonstop4h 41m

Seattle/Tacoma Intl

Mon 1/12

10:58 am-5:05 pm

Nonstop4h 07m

$177

ChicagoSeattle

ORD - SEA

ORDSEA

Chicago O'Hare Intl

Fri 2/13

1:00 pm-3:46 pm

Nonstop4h 46m

Seattle/Tacoma Intl

Sun 2/15

7:55 am-2:05 pm

Nonstop4h 10m

$177

ChicagoSeattle

MDW - SEA

MDWSEA

Chicago Midway

Thu 1/22

10:35 am-1:15 pm

Nonstop4h 40m

Seattle/Tacoma Intl

Sun 1/25

6:35 am-12:35 pm

Nonstop4h 00m

$177

ChicagoSeattle

ORD - SEA

ORDSEA

Chicago O'Hare Intl

Sat 1/31

3:35 pm-6:14 pm

Nonstop4h 39m

Seattle/Tacoma Intl

Mon 2/2

2:10 pm-8:17 pm

Nonstop4h 07m

$177

ChicagoSeattle

ORD - SEA

ORDSEA

Chicago O'Hare Intl

Wed 1/7

6:06 pm-8:56 pm

Nonstop4h 50m

Seattle/Tacoma Intl

Sun 1/18

8:30 am-2:38 pm

Nonstop4h 08m

$177

ChicagoSeattle

MDW - SEA

MDWSEA

Chicago Midway

Sun 1/11

8:05 am-10:50 am

Nonstop4h 45m

Seattle/Tacoma Intl

Sun 1/18

6:45 am-12:40 pm

Nonstop3h 55m

$177

ChicagoSeattle

ORD - SEA

ORDSEA

Chicago O'Hare Intl

Thu 1/15

6:06 pm-8:56 pm

Nonstop4h 50m

Seattle/Tacoma Intl

Sun 1/18

8:30 am-2:38 pm

Nonstop4h 08m

$177

ChicagoSeattle

ORD - SEA

ORDSEA

Chicago O'Hare Intl

Fri 2/20

4:20 pm-7:03 pm

Nonstop4h 43m

Seattle/Tacoma Intl

Mon 2/23

7:00 am-1:06 pm

Nonstop4h 06m

$177

ChicagoSeattle

ORD - SEA

ORDSEA

Chicago O'Hare Intl

Mon 1/12

1:20 pm-4:01 pm

Nonstop4h 41m

Seattle/Tacoma Intl

Mon 1/26

12:57 pm-12:28 am

1 stop9h 31m

$183

Flights are sorted by cheapest round-trip flights first.

Deals found on 12/14

Showing 1-10 of 60 results
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Best time to book a flight from Illinois to Washington

Have a flexible travel schedule? Discover the best time to fly to Washington from Illinois with our price prediction graph.
Estimated round-trip 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 Illinois to Washington

What is the cheapest month to book a flight from Illinois to State of Washington?

Currently, September is the cheapest month in which you can book a flight from Illinois to State of Washington (average of $113). Flying from Illinois to State of Washington in December is currently the most expensive (average of $185). 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 IL to WA?

Find hourly flight availability from Illinois to Washington. Discover flight options and departure times throughout the day, allowing you to choose a departure time that suits your schedule. Data last updated December 15, 2025.

It’s typically best to fly out from Illinois to State of Washington in the evening. Doing so could potentially save you 32% on the flight price compared to flying in the morning, which is usually more expensive.

What is the cheapest day to fly from Illinois to State of Washington?

Use this chart to determine the cheapest time to fly round-trip from Illinois to Washington. Price data was last updated on December 16, 2024.

Travelers seeking maximum savings on their Illinois to State of Washington flight should consider departing on Friday afternoons when fares are most often at their lowest. Sunday evenings flights should be avoided if possible as fares are typically the most expensive at this time.

Weekly flight availability from Illinois to State of Washington

Explore weekly flight availability from Illinois to Washington. 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 December 15, 2025.

The most flights from USIL to USWA are scheduled on a Monday (43 on average). You will have fewer flight options on Thursday, which is when the least amount of flights are scheduled (2 on average).

Reviews of airlines servicing Washington

Get insights into the airlines that provide service to Washington. 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 Washington. Reviews last updated December 15, 2025.
See what other customers who have flown with Alaska Airlines, Delta, and Hawaiian Airlines from Illinois to Washington have to say. Users have also rated airlines in terms of entertainment options, comfort, food, crew/service, and boarding process.
Alaska Airlines
8.0
Very good
11,451 reviews

Entertainment

7.0

Food

7.1

Crew

8.5

Overall

8.0

Boarding

8.1

Comfort

7.8

Reviews

1 / 20
10.0
Excellent

Anonymous,Dec 2025

SJC - SEA

The flight was great. Don’t have to make it better. Everything was OK.
Alaska Airlines
8.0
Very good
11,451 reviews
Alaska Airlines
8.0
Very good
11,451 reviews

Entertainment

7.0

Food

7.1

Crew

8.5

Overall

8.0

Boarding

8.1

Comfort

7.8

Reviews

1 / 20
10.0
Excellent

Anonymous,Dec 2025

SJC - SEA

The flight was great. Don’t have to make it better. Everything was OK.
Delta
7.9
Good
8,007 reviews
Alaska Airlines
8.0
Very good
11,451 reviews

Entertainment

7.0

Food

7.1

Crew

8.5

Overall

8.0

Boarding

8.1

Comfort

7.8

Reviews

1 / 20
10.0
Excellent

Anonymous,Dec 2025

SJC - SEA

The flight was great. Don’t have to make it better. Everything was OK.
Hawaiian Airlines
7.8
Good
2,819 reviews
Alaska Airlines
8.0
Very good
11,451 reviews

Entertainment

7.0

Food

7.1

Crew

8.5

Overall

8.0

Boarding

8.1

Comfort

7.8

Reviews

1 / 20
10.0
Excellent

Anonymous,Dec 2025

SJC - SEA

The flight was great. Don’t have to make it better. Everything was OK.
United Airlines
7.4
Good
9,092 reviews
Alaska Airlines
8.0
Very good
11,451 reviews

Entertainment

7.0

Food

7.1

Crew

8.5

Overall

8.0

Boarding

8.1

Comfort

7.8

Reviews

1 / 20
10.0
Excellent

Anonymous,Dec 2025

SJC - SEA

The flight was great. Don’t have to make it better. Everything was OK.
American Airlines
7.2
Good
11,052 reviews
Alaska Airlines
8.0
Very good
11,451 reviews

Entertainment

7.0

Food

7.1

Crew

8.5

Overall

8.0

Boarding

8.1

Comfort

7.8

Reviews

1 / 20
10.0
Excellent

Anonymous,Dec 2025

SJC - SEA

The flight was great. Don’t have to make it better. Everything was OK.

Related info for your journey

Find useful and relevant information for your journey from Illinois to Washington. Access travel guides, tips, and recommendations to enhance your travel experience. Get information about local attractions, weather, transportation options, and more.

  • How long is the flight from Illinois to State of Washington?

    Airlines like Southwest, United Airlines, and Alaska Airlines fly from Illinois to State of Washington in about 4h 40m. The time it takes to get you to your destination is usually consistent. Illinois and State of Washington are separated by a distance of 1728 mi. Most flights are nonstop.

  • What are the cheapest airlines to fly from Illinois to State of Washington one-way?

    To fly one-way, consider booking your trip with MIAT Mongolian, which is currently one of the cheapest options available, starting at $530. Korean Air flights start at $572 while deals on Turkish Airlines start at $669 one-way.

  • Can I find deals for flights from Illinois to Washington that include hotel bookings?

    Yes. In addition to deals on Illinois to Washington flights, Cheapflights offers vacation packages that include both flights and hotel.

  • How can I find direct flights from Illinois to Washington?

    After entering your origin and destination, apply the non-stop filter on the search result page to find direct flights from Illinois to Washington.

  • Can I find deals for business class flights from Illinois to Washington?

    Yes. Cheapflights offers flight deals from Illinois to Washington 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 Illinois to State of Washington?

    Currently, September is the cheapest month in which you can book a flight from Illinois to State of Washington (average of $113). Flying from Illinois to State of Washington in December is currently the most expensive (average of $185). 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

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Alternative routes for Illinois to Washington

See prices for flight routes from nearby airports that may be better suited for you.
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Top 8 airlines flying from Illinois to Washington

Discover the top 8 airlines that operate flights from Illinois to Washington. Compare their services, reliability, and customer satisfaction ratings to choose the airline that best suits your travel preferences and needs. Over the last 7 days, Cheapflights users made 2,558,603 searches. Data last updated December 15, 2025.
AirlineCheapestAverageFlexibilityOn-time
Hawaiian AirlinesCheapest$91Average$251FlexibilityNo cancel feeOn-time85%
Spirit AirlinesCheapest$105Average$202FlexibilityNo cancel feeOn-time65%
DeltaCheapest$120Average$304FlexibilityNo cancel feeOn-timeN/A
FrontierCheapest$142Average$264FlexibilityNo cancel feeOn-time62%
Alaska AirlinesCheapest$169Average$438FlexibilityNo cancel feeOn-time75%
American AirlinesCheapest$175Average$456FlexibilityNo cancel feeOn-time71%
United AirlinesCheapest$177Average$446FlexibilityNo cancel feeOn-time69%
SouthwestCheapest$189Average$440FlexibilityNo cancel feeOn-time63%

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