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Cheap flights from Washington to Illinois from $60

This is the cheapest one-way flight price found by a momondo user in the last 72 hours by searching for a flight from Washington to Illinois departing on 3/6. Fares may change, and may not be available for all flights or travel dates. Click the price to refresh the search for this deal.
1 adult
0 bags

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Find the cheapest flights from Washington to Illinois

Cheap round-trip flights

Enter your travel dates to find the best prices.
American Airlines Logo
12:59 am - 11:01 am
SEA
-
STL
8h 02m
1 stop
American Airlines Logo
6:37 pm - 12:24 am
STL
-
SEA
7h 47m
1 stop
$159American Airlines
Mon, Mar 2 - Tue, Mar 10
American Airlines Logo
12:07 am - 6:23 am
SEA
-
ORD
4h 16mnonstop
American Airlines Logo
8:20 pm - 11:04 pm
ORD
-
SEA
4h 44mnonstop
$162American Airlines
Fri, Feb 27 - Sat, Mar 7
United Airlines Logo
7:00 am - 1:06 pm
SEA
-
ORD
4h 06mnonstop
United Airlines Logo
4:20 pm - 7:03 pm
ORD
-
SEA
4h 43mnonstop
$163United Airlines
Sat, Feb 28 - Sat, Mar 7
Delta Logo
3:35 pm - 11:14 pm
SEA
-
STL
5h 39m
1 stop
Delta Logo
5:00 pm - 10:01 pm
STL
-
SEA
7h 01m
1 stop
$177Delta
Fri, Apr 17 - Sat, Apr 25
Alaska Airlines Logo
5:55 pm - 11:56 pm
SEA
-
ORD
4h 01mnonstop
Alaska Airlines Logo
3:07 pm - 10:39 pm
ORD
-
SEA
9h 32m
1 stop
$181Alaska Airlines
Sat, Feb 28 - Sat, Mar 7
Alaska Airlines Logo
10:22 am - 4:33 pm
SEA
-
ORD
4h 11mnonstop
Alaska Airlines Logo
3:07 pm - 11:40 pm
ORD
-
SEA
10h 33m
1 stop
$187Alaska Airlines
Sat, Feb 28 - Sat, Mar 7
Southwest Logo
6:00 am - 1:55 pm
SEA
-
MDW
5h 55m
1 stop
Southwest Logo
6:20 pm - 10:55 pm
MDW
-
SEA
6h 35m
1 stop
$192Southwest
Sat, Mar 7 - Sat, Mar 14
Delta Logo
11:25 am - 9:52 pm
PSC
-
ORD
8h 27m
1 stop
Delta Logo
7:10 pm - 11:29 pm
ORD
-
PSC
6h 19m
1 stop
$197Delta
Sat, Mar 7 - Tue, Mar 10
Southwest Logo
7:05 am - 1:10 pm
SEA
-
MDW
4h 05mnonstop
Southwest Logo
9:40 pm - 12:15 am
MDW
-
SEA
4h 35mnonstop
$197Southwest
Sat, Feb 28 - Sat, Mar 7
United Airlines Logo
2:24 pm - 10:59 pm
PDX
-
STL
6h 35m
1 stop
United Airlines Logo
5:59 pm - 10:54 pm
STL
-
PDX
6h 55m
1 stop
$232United Airlines
Sat, May 2 - Wed, May 6

Alaska Airlines flights from State of Washington to Illinois

Our best Alaska Airlines deals on State of Washington to Illinois flight tickets
Alaska Airlines
Feb 28
SEA5:55 pmSeattle/Tacoma Intl
4h 01m
ORD11:56 pmChicago O'Hare Intl
Mar 7
ORD3:07 pmChicago O'Hare Intl
9h 32m
1 stop
SEA10:39 pmSeattle/Tacoma Intl
$181
Alaska Airlines
Mar 3
SEA7:55 amSeattle/Tacoma Intl
3h 56m
STL1:51 pmLambert-St Louis
Mar 10
STL7:00 amLambert-St Louis
4h 42m
SEA9:42 amSeattle/Tacoma Intl
$197
Alaska Airlines
Feb 26
SEA6:07 pmSeattle/Tacoma Intl
3h 52m
STL11:59 pmLambert-St Louis
Feb 28
STL2:47 pmLambert-St Louis
4h 39m
SEA5:26 pmSeattle/Tacoma Intl
$207

Hawaiian Airlines flights from State of Washington to Illinois

Our best Hawaiian Airlines deals on State of Washington to Illinois flight tickets
Hawaiian Airlines
Feb 28
SEA8:00 amSeattle/Tacoma Intl
4h 11m
ORD2:11 pmChicago O'Hare Intl
Mar 7
ORD7:00 amChicago O'Hare Intl
4h 51m
SEA9:51 amSeattle/Tacoma Intl
$185
Hawaiian Airlines
Mar 3
SEA10:22 amSeattle/Tacoma Intl
4h 11m
ORD4:33 pmChicago O'Hare Intl
Mar 10
ORD7:00 amChicago O'Hare Intl
4h 51m
SEA9:51 amSeattle/Tacoma Intl
$187
Hawaiian Airlines
Feb 28
SEA5:55 pmSeattle/Tacoma Intl
4h 01m
ORD11:56 pmChicago O'Hare Intl
Mar 7
ORD3:07 pmChicago O'Hare Intl
10h 33m
1 stop
SEA11:40 pmSeattle/Tacoma Intl
$190

momondo Fare Finder

 
Customize your flight search to find flights from State of Washington to Illinois 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, momondo users made 832,500 searches. Data last updated February 4, 2026.
Use the filters below to find and compare flights from Washington to Illinois that are best for you.

Fly from

Fly to

Route

Depart

Return

Price

SeattleSt. Louis

SEA - STL

SEASTL

Seattle/Tacoma Intl

Mon 3/2

12:59 am-11:01 am

1 stop8h 02m

Lambert-St Louis

Tue 3/10

6:37 pm-12:24 am

1 stop7h 47m

$159

SeattleChicago

SEA - ORD

SEAORD

Seattle/Tacoma Intl

Fri 2/27

12:07 am-6:23 am

Nonstop4h 16m

Chicago O'Hare Intl

Sat 3/7

8:20 pm-11:04 pm

Nonstop4h 44m

$162

SeattleChicago

SEA - ORD

SEAORD

Seattle/Tacoma Intl

Sat 2/28

7:00 am-1:06 pm

Nonstop4h 06m

Chicago O'Hare Intl

Sat 3/7

4:20 pm-7:03 pm

Nonstop4h 43m

$163

SeattleSt. Louis

SEA - STL

SEASTL

Seattle/Tacoma Intl

Fri 4/17

3:35 pm-11:14 pm

1 stop5h 39m

Lambert-St Louis

Sat 4/25

5:00 pm-10:01 pm

1 stop7h 01m

$177

SeattleChicago

SEA - ORD

SEAORD

Seattle/Tacoma Intl

Sat 2/28

5:55 pm-11:56 pm

Nonstop4h 01m

Chicago O'Hare Intl

Sat 3/7

3:07 pm-10:39 pm

1 stop9h 32m

$181

SeattleChicago

SEA - ORD

SEAORD

Seattle/Tacoma Intl

Sat 2/28

10:22 am-4:33 pm

Nonstop4h 11m

Chicago O'Hare Intl

Sat 3/7

3:07 pm-11:40 pm

1 stop10h 33m

$187

SeattleChicago

SEA - MDW

SEAMDW

Seattle/Tacoma Intl

Sat 3/7

6:00 am-1:55 pm

1 stop5h 55m

Chicago Midway

Sat 3/14

6:20 pm-10:55 pm

1 stop6h 35m

$192

PascoChicago

PSC - ORD

PSCORD

Pasco Tri Cities

Sat 3/7

11:25 am-9:52 pm

1 stop8h 27m

Chicago O'Hare Intl

Tue 3/10

7:10 pm-11:29 pm

1 stop6h 19m

$197

SeattleChicago

SEA - MDW

SEAMDW

Seattle/Tacoma Intl

Sat 2/28

7:05 am-1:10 pm

Nonstop4h 05m

Chicago Midway

Sat 3/7

9:40 pm-12:15 am

Nonstop4h 35m

$197

PortlandSt. Louis

PDX - STL

PDXSTL

Portland

Sat 5/2

2:24 pm-10:59 pm

1 stop6h 35m

Lambert-St Louis

Wed 5/6

5:59 pm-10:54 pm

1 stop6h 55m

$232

Flights are sorted by cheapest round-trip flights first.

Showing 1-10 of 20 resultsSorted by cheapest first
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See travel insights to Illinois from

How to get the cheapest flight ticket from State of Washington to Illinois

Look no further. We've gone through all the searches for this route on momondo so you have the important information and insights to find the cheapest flight ticket for your trip

What is the cheapest month to fly to Illinois?

The cheapest month to fly to Illinois from State of Washington is in February. Flight prices, which tend to average around $245, are often lower during this time because this is during the off-season. If you aren’t able to travel to Illinois during the month of February, then flying in April is also cheap. Prices for this month can be found on momondo for an average of $273.

What is the cheapest day to depart on your flight to Illinois?

The cheapest day to depart from State of Washington to Illinois is on a Wednesday when prices can be found for as low as $390. Flights from State of Washington to Illinois on a Sunday will generally be more expensive and average around $487. Keep in mind that these prices on both days could fluctuate depending on the season and the demand.

What is the cheapest time of day to depart on your flight to Illinois?

Our most recent data shows that the best time of day to fly to Illinois is in the afternoon. Flights from State of Washington to Illinois during this time can be as low as $291. Flights in the morning are often more expensive with an average ticket price of $440.

What is the cheapest Washington to Illinois flight route?

Fly from Seattle/Tacoma Intl to Chicago Midway for the best Washington - Illinois flight prices

How far in advance should I book a flight to Illinois?

You are more likely to see cheaper flights to Illinois from State of Washington when booking weeks ahead of your departure date. In general, you can expect to find flights to Illinois for around $299 when searching weeks out. However, flight prices might be lower outside of this timeframe. For example, people recently found flights to Illinois from State of Washington for as low as $253 on momondo.

What cabin class options are available on Washington to Illinois flights?

There are 4 cabin classes available to choose from on Washington to Illinois flights. Cabin price and availability will vary by airline so perform a search above to find the right deals for you.

Can stopping save me money on State of Washington to Illinois flights?

No. A direct flight is the cheapest option for a flight between State of Washington to Illinois.

Cheap State of Washington to Illinois flight deals and tips

Find info about flight duration, direct flights, and airports for your flight from State of Washington to Illinois

Best Price Found

$158

Fastest flight time

3h 30m

Direct flights

Every day

Airports in Illinois

98 airports
The best one-way flight to Illinois from State of Washington in the past 72 hours is $158. The best round-trip flight deal from State of Washington to Illinois found on momondo in the last 72 hours is $292.
The fastest flight from State of Washington to Illinois takes 3h 30m
Direct flights go from State of Washington to Illinois every day.
There are 98 airports in Illinois. From State of Washington there are direct flights to Chicago O'Hare Intl (ORD), Chicago Midway (MDW), Lambert-St Louis (STL).
Search flight deals

  • When did momondo last update prices for flights from Washington to Illinois?

    Prices for flights from Washington to Illinois are refreshed on a daily basis.

  • How many operators does momondo search for flights from Washington to Illinois?

  • How old do you have to be to fly from Washington to Illinois?

    The minimum age a child must be to fly alone is five but airlines that offer an unaccompanied minor (UNMR) service will have their own age restrictions, including rules around flight length, timings, and stopovers. We always recommend checking with the individual airline you are booking with to travel from Washington to Illinois.

  • What documentation or ID do you need to fly to Illinois?

    The required travel and health documents for your Illinois trip may vary depending on your itinerary and personal circumstances. As a general rule, you should carry multiple documents, including a national ID card or driver's license and a passport valid for six months after your intended arrival at Illinois. We recommend that you seek guidance from your airline or a reliable third party such as IATA.

  • What is the most popular plane model from State of Washington to Illinois?

Best airlines flying from State of Washington to Illinois

Compare and see reviews for airlines that fly from State of Washington to Illinois with momondo
Airline
Rating
Free Cancellation
Price
DeltaPriceFrom $97Free CancellationRating
7.9
8,146 reviews
Search Delta flights
Hawaiian AirlinesPriceFrom $114Free CancellationRating
7.8
2,831 reviews
Search Hawaiian Airlines flights
FrontierPriceFrom $137Free CancellationRating
5.7
3,052 reviews
Search Frontier flights
United AirlinesPriceFrom $155Free CancellationRating
7.4
9,236 reviews
Search United Airlines flights
Alaska AirlinesPriceFrom $169Free CancellationRating
8.0
11,839 reviews
Search Alaska Airlines flights
American AirlinesPriceFrom $177Free CancellationRating
7.2
11,222 reviews
Search American Airlines flights
SouthwestPriceFrom $184Free CancellationRating
8.0
4,274 reviews
Search Southwest flights

Why use momondo?

Why should I use momondo to find a flight deal from Washington to Illinois?

It is quick and easy to find Washington to Illinois flights on momondo. We search and return numerous flight options from various airlines and agents. You can then use our filters to narrow your search until you have found the most convenient flight to Illinois that suits you.

Can I find flights from Washington to Illinois with flexible booking policies on momondo?

momondo does allow users to show only those flights to Illinois from Washington which offer a flexible booking policy as well as other useful filters and features.

How can momondo help me find flights from Washington to Illinois?

Once you have performed a search in the form on the page, momondo provides useful filters and insights. We can show you the cheapest days and times to fly as well as help filter your options to help you make an informed choice when booking flights to Illinois from Washington.

I’m not ready to book a flight from Washington to Illinois right now. Can momondo alert me if prices change?

If you are simply researching potential flights to Illinois, momondo offers a useful price alert feature which will track prices for flights to Illinois from Washington and alert you when they change.

An easier way to manage your Illinois trip

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