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$85+ 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 7/29. Fares are subject to change and may not be available on all flights or dates of travel.
ORD — SEA
May 4 — May 111
Sun 5/4
Sun 5/11
1 adult, Economy
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Cheap flight deals from Illinois to Washington

Keep the following information in mind while searching for Illinois to Washington flight deals. Data was last updated April 29, 2025.

Most accurate provider

FlightHub
3 stars

Most trusted provider

eDreams
3 stars

Round-trip from

$169
(Delta)

One-way from

$85
(Southwest)

Popular in

July

Cheapest in

February

Average price

$249

Good round-trip deal

$209 or less

Good one-way deal

$89 or less
Provider with most accurate pricing for Chicago (CHI)-Seattle/Tacoma Intl flight deals.
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Provider most trusted by Cheapflights users for Chicago (CHI)-Seattle/Tacoma Intl flights.
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From Illinois to Washington
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One-way flight from Illinois to Washington
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Highest demand for flights based on searches. 16% potential increase in price ($56 potential increase over avg. RT price).
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Cheapest flight prices on average. 2% potential price decrease ($7 potential savings vs. average RT price).
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Average for round-trip flights in April 2025
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Price to beat on a round-trip flight from Illinois to Washington.
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Price to beat on a one-way flight from Illinois to Washington.
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Find 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 April 29, 2025.

This Delta deal was found by Cheapflights users on 4/29. 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 7/27:09 amORD - SEA
Nonstop4h 36mDelta
Tue 7/157:10 amSEA - ORD
Nonstop4h 07mDelta
Deal found 4/29$169
This Expedia deal was found by Cheapflights users on 4/28. 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 Expedia is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 5/176:00 amORD - SEA
Nonstop4h 27mMultiple Airlines
Fri 5/303:20 pmSEA - ORD
1 stop12h 05mMultiple Airlines
Deal found 4/28$172
This Kiwi.com deal was found by Cheapflights users on 4/28. 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 5/176:00 amORD - SEA
Nonstop4h 27mHawaiian Airlines
Tue 8/1912:59 amSEA - ORD
Nonstop4h 04mHawaiian Airlines
Deal found 4/28$173
This United Airlines deal was found by Cheapflights users on 4/28. 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.
Tue 8/197:10 amORD - SEA
Nonstop4h 33mUnited Airlines
Tue 8/267:05 amSEA - ORD
1 stop8h 05mUnited Airlines
Deal found 4/28$175
This Cheapflightsfares deal was found by Cheapflights users on 4/29. 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 Cheapflightsfares is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 5/811:50 amORD - SEA
1 stop14h 20mSpirit Airlines
Tue 5/203:20 pmSEA - ORD
1 stop12h 05mSpirit Airlines
Deal found 4/29$176
This Southwest deal was found by Cheapflights users on 4/28. 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.
Sat 6/149:40 pmMDW - SEA
Nonstop4h 35mSouthwest
Tue 6/2410:55 pmSEA - MDW
Nonstop4h 05mSouthwest
Deal found 4/28$189
This Alaska Airlines deal was found by Cheapflights users on 4/28. 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.
Sat 5/176:00 amORD - SEA
Nonstop4h 27mAlaska Airlines
Sun 5/2510:10 amSEA - ORD
1 stop11h 46mAlaska Airlines
Deal found 4/28$189
This Delta deal was found by Cheapflights users on 4/28. 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.
Mon 7/77:15 pmSTL - SEA
1 stop6h 44mDelta
Tue 7/2211:59 pmSEA - STL
1 stop6h 35mDelta
Deal found 4/28$189
This Southwest deal was found by Cheapflights users on 4/28. 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.
Mon 7/146:15 pmSTL - SEA
1 stop8h 35mSouthwest
Wed 7/1610:40 pmSEA - STL
2 stops10h 55mSouthwest
Deal found 4/28$194
This Delta deal was found by Cheapflights users on 4/28. 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.
Sat 6/148:27 amORD - GEG
1 stop6h 50mDelta
Sat 6/286:50 amGEG - ORD
1 stop6h 13mDelta
Deal found 4/28$195
This Flightnetwork deal was found by Cheapflights users on 4/28. 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 Flightnetwork is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 5/312:44 pmMDW - SEA
1 stop11h 53mFrontier
Sat 6/76:25 amSEA - MDW
1 stop12h 28mFrontier
Deal found 4/28$197
This American Airlines deal was found by Cheapflights users on 4/29. 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 American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 6/47:35 amORD - SEA
Nonstop4h 40mAmerican Airlines
Mon 6/912:05 amSEA - ORD
Nonstop4h 00mAmerican Airlines
Deal found 4/29$200

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 April 29, 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

ORD - SEA

ORDSEA

Chicago O'Hare Intl

Wed 7/2

7:09 am-9:45 am

Nonstop4h 36m

Seattle/Tacoma Intl

Tue 7/15

7:10 am-1:17 pm

Nonstop4h 07m

$169

ChicagoSeattle

ORD - SEA

ORDSEA

Chicago O'Hare Intl

Sat 5/17

6:00 am-8:27 am

Nonstop4h 27m

Seattle/Tacoma Intl

Fri 5/30

3:20 pm-5:25 am

1 stop12h 05m

$172

ChicagoSeattle

ORD - SEA

ORDSEA

Chicago O'Hare Intl

Sat 5/17

6:00 am-8:27 am

Nonstop4h 27m

Seattle/Tacoma Intl

Tue 8/19

12:59 am-7:03 am

Nonstop4h 04m

$173

ChicagoSeattle

ORD - SEA

ORDSEA

Chicago O'Hare Intl

Tue 8/19

7:10 am-9:43 am

Nonstop4h 33m

Seattle/Tacoma Intl

Tue 8/26

7:05 am-5:10 pm

1 stop8h 05m

$175

ChicagoSeattle

MDW - SEA

MDWSEA

Chicago Midway

Sat 6/14

9:40 pm-12:15 am

Nonstop4h 35m

Seattle/Tacoma Intl

Tue 6/24

10:55 pm-5:00 am

Nonstop4h 05m

$189

ChicagoSeattle

ORD - SEA

ORDSEA

Chicago O'Hare Intl

Sat 5/17

6:00 am-8:27 am

Nonstop4h 27m

Seattle/Tacoma Intl

Sun 5/18

9:00 am-11:56 pm

1 stop12h 56m

$189

St. LouisSeattle

STL - SEA

STLSEA

Lambert-St Louis

Mon 7/7

7:15 pm-11:59 pm

1 stop6h 44m

Seattle/Tacoma Intl

Thu 7/17

6:00 am-4:42 pm

1 stop8h 42m

$189

ChicagoSeattle

ORD - SEA

ORDSEA

Chicago O'Hare Intl

Wed 5/28

11:50 am-12:10 am

1 stop14h 20m

Seattle/Tacoma Intl

Wed 6/4

3:20 pm-5:25 am

1 stop12h 05m

$193

St. LouisSeattle

STL - SEA

STLSEA

Lambert-St Louis

Mon 7/14

6:15 pm-12:50 am

1 stop8h 35m

Seattle/Tacoma Intl

Wed 7/16

10:40 pm-11:35 am

2 stops10h 55m

$194

ChicagoSpokane

ORD - GEG

ORDGEG

Chicago O'Hare Intl

Sat 6/14

8:27 am-1:17 pm

1 stop6h 50m

Spokane

Sat 6/28

6:50 am-3:03 pm

1 stop6h 13m

$195

Flights are sorted by cheapest round-trip flights first.

Deals found on 4/28

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, January is the cheapest month in which you can book a flight from Illinois to State of Washington (average of $238). Flying from Illinois to State of Washington in July is currently the most expensive (average of $405). 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 April 29, 2025.

Regardless of the time of day you decide to fly, the ticket price will remain around the same. Book flights from Illinois to State of Washington as you normally would.

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 April 29, 2025.

The most flights from USIL to USWA are scheduled on a Tuesday (56 on average). You will have fewer flight options on Saturday, which is when the least amount of flights are scheduled (22 on average).

Rainfall in Washington by month

Plan your trip to Washington by taking into account the average rainfall totals by month.

In terms of precipitation, rainfall in State of Washington ranges from 0.7 - 6.6 inches per month. November is typically the wettest month, when rainfall can reach 6.6 in. July is typically the driest time to visit State of Washington when rainfall is around 0.7 in.

Temperature in Washington by month

Plan your trip to Washington by taking into account the average temperature totals by month.

If weather is an important factor for your trip to State of Washington, use this chart to help with planning. For those seeking warmer temperatures, July is the ideal time of year to visit, when temperatures reach an average of 66.2 F. Travelers looking to avoid the cold should look outside of December, when temperatures are typically at their lowest (around 41.0 F).

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 April 29, 2025.
Peruse reviews from past customers who have flown with Alaska Airlines, Southwest and Delta from Illinois to Washington to help guide your decision. In addition to providing an overall rating, users have also rated airlines in terms of entertainment options, comfort, food, crew/service, and boarding process.
Alaska Airlines
8.0
Very good
9,961 reviews

Boarding

8.2

Crew

8.5

Comfort

7.9

Entertainment

7.1

Food

7.1

Overall

8.0

Reviews

1 / 20
10.0
Excellent

James,Apr 2025

LAX - SFO

Good flight except the uncontrollable cold air from the ceiling.
Alaska Airlines
8.0
Very good
9,961 reviews
Alaska Airlines
8.0
Very good
9,961 reviews

Boarding

8.2

Crew

8.5

Comfort

7.9

Entertainment

7.1

Food

7.1

Overall

8.0

Reviews

1 / 20
10.0
Excellent

James,Apr 2025

LAX - SFO

Good flight except the uncontrollable cold air from the ceiling.
Southwest
8.0
Very good
4,295 reviews
Alaska Airlines
8.0
Very good
9,961 reviews

Boarding

8.2

Crew

8.5

Comfort

7.9

Entertainment

7.1

Food

7.1

Overall

8.0

Reviews

1 / 20
10.0
Excellent

James,Apr 2025

LAX - SFO

Good flight except the uncontrollable cold air from the ceiling.
Delta
8.0
Very good
7,929 reviews
Alaska Airlines
8.0
Very good
9,961 reviews

Boarding

8.2

Crew

8.5

Comfort

7.9

Entertainment

7.1

Food

7.1

Overall

8.0

Reviews

1 / 20
10.0
Excellent

James,Apr 2025

LAX - SFO

Good flight except the uncontrollable cold air from the ceiling.
Hawaiian Airlines
7.9
Good
2,402 reviews
Alaska Airlines
8.0
Very good
9,961 reviews

Boarding

8.2

Crew

8.5

Comfort

7.9

Entertainment

7.1

Food

7.1

Overall

8.0

Reviews

1 / 20
10.0
Excellent

James,Apr 2025

LAX - SFO

Good flight except the uncontrollable cold air from the ceiling.
United Airlines
7.4
Good
8,696 reviews
Alaska Airlines
8.0
Very good
9,961 reviews

Boarding

8.2

Crew

8.5

Comfort

7.9

Entertainment

7.1

Food

7.1

Overall

8.0

Reviews

1 / 20
10.0
Excellent

James,Apr 2025

LAX - SFO

Good flight except the uncontrollable cold air from the ceiling.

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.

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

    To fly one-way, consider booking your trip with Southwest, which is currently one of the cheapest options available, starting at $85. Delta flights start at $85 while deals on Spirit Airlines start at $87 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, January is the cheapest month in which you can book a flight from Illinois to State of Washington (average of $238). Flying from Illinois to State of Washington in July is currently the most expensive (average of $405). 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 April 29, 2025.
AirlineCheapestAverageFlexibilityOn-time
Hawaiian AirlinesCheapest$114Average$251FlexibilityNo cancel feeOn-time85%
FrontierCheapest$118Average$234FlexibilityNo cancel feeOn-time62%
Spirit AirlinesCheapest$120Average$237FlexibilityNo cancel feeOn-time65%
DeltaCheapest$147Average$385FlexibilityNo cancel feeOn-timeN/A
Alaska AirlinesCheapest$155Average$490FlexibilityNo cancel feeOn-time75%
United AirlinesCheapest$155Average$505FlexibilityNo cancel feeOn-time69%
American AirlinesCheapest$168Average$490FlexibilityNo cancel feeOn-time71%
SouthwestCheapest$199Average$467FlexibilityNo cancel feeOn-time63%

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