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Cheap flights from Washington to Illinois from $56

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 12/5. Fares may change, and may not be available for all flights or travel dates. Click the price to refresh the search for this deal.
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0 bags

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Cheap round-trip flights

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Multiple Airlines Logo
5:50 pm - 11:59 pmSEA-ORD
4h 09mnonstop
Multiple Airlines Logo
7:00 am - 12:30 pmORD-SEA
7h 30m1 stop
$178Multiple Airlines
Find Deal
mar., dic. 16 - lun., ene. 5
Frontier Logo
12:48 pm - 11:08 amSEA-MDW
20h 20m1 stop
Frontier Logo
6:15 am - 4:36 pmMDW-SEA
12h 21m1 stop
$178Frontier
Find Deal
sáb., dic. 6 - lun., dic. 8
American Airlines Logo
2:04 pm - 8:15 pmSEA-ORD
4h 11mnonstop
American Airlines Logo
7:36 pm - 10:20 pmORD-SEA
4h 44mnonstop
$179American Airlines
Find Deal
jue., ene. 15 - lun., ene. 19
Alaska Airlines Logo
12:25 am - 6:29 amSEA-ORD
4h 04mnonstop
Alaska Airlines Logo
3:35 pm - 6:22 pmORD-SEA
4h 47mnonstop
$182Alaska Airlines
Find Deal
vie., dic. 26 - mié., ene. 7
Alaska Airlines Logo
12:25 am - 6:29 amSEA-ORD
4h 04mnonstop
Alaska Airlines Logo
3:35 pm - 6:22 pmORD-SEA
4h 47mnonstop
$183Alaska Airlines
Find Deal
vie., dic. 26 - jue., ene. 8
United Airlines Logo
7:00 am - 12:36 pmGEG-ORD
3h 36mnonstop
United Airlines Logo
4:00 pm - 6:03 pmORD-GEG
4h 03mnonstop
$235United Airlines
Find Deal
mar., feb. 24 - sáb., feb. 28
Delta Logo
12:32 am - 8:40 amPDX-ORD
6h 08m1 stop
Delta Logo
7:20 am - 12:40 pmORD-PDX
7h 20m1 stop
$244Delta
Find Deal
mar., dic. 2 - mar., dic. 9
Delta Logo
11:53 am - 11:40 pmPDX-MDW
9h 47m1 stop
Delta Logo
12:50 pm - 7:35 pmMDW-PDX
8h 45m1 stop
$244Delta
Find Deal
jue., nov. 27 - mié., dic. 3
United Airlines Logo
4:02 pm - 11:59 pmGEG-ORD
5h 57m1 stop
United Airlines Logo
4:00 pm - 6:03 pmORD-GEG
4h 03mnonstop
$245United Airlines
Find Deal
mar., feb. 24 - sáb., feb. 28
American Airlines Logo
12:41 am - 10:36 amSEA-STL
7h 55m1 stop
American Airlines Logo
7:38 am - 2:05 pmSTL-SEA
8h 27m1 stop
$259American Airlines
Find Deal
mar., dic. 2 - mié., dic. 10

United Airlines flights from State of Washington to Illinois

Our best United Airlines deals on State of Washington to Illinois flight tickets
United Airlines
Feb 24
GEG7:00 amSpokane
3h 36m
ORD12:36 pmChicago O'Hare Intl
Feb 28
ORD4:00 pmChicago O'Hare Intl
4h 03m
GEG6:03 pmSpokane
$235
Find similar
United Airlines
Jan 20
PDX1:24 pmPortland
5h 51m
1 stop
ORD9:15 pmChicago O'Hare Intl
Jan 22
ORD6:29 pmChicago O'Hare Intl
8h 10m
1 stop
PDX12:39 amPortland
$242
Find similar
United Airlines
Feb 24
GEG4:02 pmSpokane
5h 57m
1 stop
ORD11:59 pmChicago O'Hare Intl
Feb 28
ORD4:00 pmChicago O'Hare Intl
4h 03m
GEG6:03 pmSpokane
$245
Find similar

Delta flights from State of Washington to Illinois

Our best Delta deals on State of Washington to Illinois flight tickets
Delta
Jan 9
SEA7:10 amSeattle/Tacoma Intl
4h 12m
ORD1:22 pmChicago O'Hare Intl
Jan 13
ORD12:30 pmChicago O'Hare Intl
6h 15m
1 stop
SEA4:45 pmSeattle/Tacoma Intl
$197
Find similar
Delta
Dec 11
SEA7:20 amSeattle/Tacoma Intl
4h 13m
ORD1:33 pmChicago O'Hare Intl
Dec 15
ORD5:07 pmChicago O'Hare Intl
7h 18m
1 stop
SEA10:25 pmSeattle/Tacoma Intl
$207
Find similar
Delta
Jan 10
SEA5:25 amSeattle/Tacoma Intl
5h 51m
1 stop
ORD1:16 pmChicago O'Hare Intl
Jan 16
ORD1:55 pmChicago O'Hare Intl
9h 54m
1 stop
SEA9:49 pmSeattle/Tacoma Intl
$217
Find similar

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 noviembre 17, 2025.
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

SeattleChicago

SEA - ORD

SEAORD

Seattle/Tacoma Intl

mar. 12/16

5:50 pm-11:59 pm

Nonstop4h 09m

Chicago O'Hare Intl

lun. 1/5

7:00 am-12:30 pm

1 stop7h 30m

$178

SeattleChicago

SEA - MDW

SEAMDW

Seattle/Tacoma Intl

sáb. 12/6

12:48 pm-11:08 am

1 stop20h 20m

Chicago Midway

lun. 12/8

6:15 am-4:36 pm

1 stop12h 21m

$178

SeattleChicago

SEA - ORD

SEAORD

Seattle/Tacoma Intl

jue. 1/15

2:04 pm-8:15 pm

Nonstop4h 11m

Chicago O'Hare Intl

lun. 1/19

7:36 pm-10:20 pm

Nonstop4h 44m

$179

SeattleChicago

SEA - ORD

SEAORD

Seattle/Tacoma Intl

vie. 12/26

12:25 am-6:29 am

Nonstop4h 04m

Chicago O'Hare Intl

mié. 1/7

3:35 pm-6:22 pm

Nonstop4h 47m

$182

SeattleChicago

SEA - ORD

SEAORD

Seattle/Tacoma Intl

vie. 12/26

12:25 am-6:29 am

Nonstop4h 04m

Chicago O'Hare Intl

jue. 1/8

3:35 pm-6:22 pm

Nonstop4h 47m

$183

SpokaneChicago

GEG - ORD

GEGORD

Spokane

mar. 2/24

7:00 am-12:36 pm

Nonstop3h 36m

Chicago O'Hare Intl

sáb. 2/28

4:00 pm-6:03 pm

Nonstop4h 03m

$235

PortlandChicago

PDX - ORD

PDXORD

Portland

mar. 12/2

12:32 am-8:40 am

1 stop6h 08m

Chicago O'Hare Intl

mar. 12/9

7:20 am-12:40 pm

1 stop7h 20m

$244

PortlandChicago

PDX - MDW

PDXMDW

Portland

jue. 11/27

11:53 am-11:40 pm

1 stop9h 47m

Chicago Midway

mié. 12/3

12:50 pm-7:35 pm

1 stop8h 45m

$244

SpokaneChicago

GEG - ORD

GEGORD

Spokane

mar. 2/24

4:02 pm-11:59 pm

1 stop5h 57m

Chicago O'Hare Intl

sáb. 2/28

4:00 pm-6:03 pm

Nonstop4h 03m

$245

SeattleSt. Louis

SEA - STL

SEASTL

Seattle/Tacoma Intl

mar. 12/2

12:41 am-10:36 am

1 stop7h 55m

Lambert-St Louis

mié. 12/10

7:38 am-2:05 pm

1 stop8h 27m

$259

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 January. Flight prices, which tend to average around $229, 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 January, then flying in February is also cheap. Prices for this month can be found on momondo for an average of $267.

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 $395. Flights from State of Washington to Illinois on a Sunday will generally be more expensive and average around $494. 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 $290. Flights in the morning are often more expensive with an average ticket price of $453.

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 $308 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 $258 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?

You could potentially save up to 32% on your flight if you consider stops on a State of Washington to Illinois flight.

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

$168

Fastest flight time

3h 36m

Direct flights

Every day

Airports in Illinois

3 airports
The best one-way flight to Illinois from State of Washington in the past 72 hours is $168. The best round-trip flight deal from State of Washington to Illinois found on momondo in the last 72 hours is $312.
The fastest flight from State of Washington to Illinois takes 3h 36m
Direct flights go from State of Washington to Illinois every day.
There are 3 airports near Illinois: 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
Spirit AirlinesPriceFrom $107Free CancellationRating
6.3
8,144 reviews
Search Spirit Airlines flights
Hawaiian AirlinesPriceFrom $121Free CancellationRating
7.8
2,809 reviews
Search Hawaiian Airlines flights
DeltaPriceFrom $124Free CancellationRating
7.9
8,006 reviews
Search Delta flights
FrontierPriceFrom $137Free CancellationRating
5.8
3,106 reviews
Search Frontier flights
United AirlinesPriceFrom $167Free CancellationRating
7.4
9,014 reviews
Search United Airlines flights
Alaska AirlinesPriceFrom $177Free CancellationRating
8.0
11,309 reviews
Search Alaska Airlines flights
SouthwestPriceFrom $179Free CancellationRating
8.0
4,244 reviews
Search Southwest flights
American AirlinesPriceFrom $181Free CancellationRating
7.2
11,046 reviews
Search American Airlines 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.

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mié. 12/17
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