Cheap flights from Washington to Illinois from $55
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 7/16. 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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Spirit Airlines flights from State of Washington to Illinois
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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 $223, 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 September is also cheap. Prices for this month can be found on momondo for an average of $246.
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 $398. Flights from State of Washington to Illinois on a Sunday will generally be more expensive and average around $515. 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 $465.
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 $307 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 $252 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.
What is the cheapest airline that flies from Washington to Illinois?
Frontier, Spirit Airlines, and United Airlines are the most popular carriers operating from Washington to Illinois
What airlines fly to Illinois?
Alaska Airlines, Delta and United Airlines are the top three most popular airlines that fly to Illinois from State of Washington according to our data. Alaska Airlines is the first choice among our users, with 30% of people opting to fly with this airline when traveling to Illinois. Keep in mind that there are 8 different airlines that fly to Illinois on a routine basis, so you have a few additional options to choose from.
How many flights depart from State of Washington to Illinois on average per day?
101 flights are operational daily from State of Washington to Illinois as of June 2025. The most popular departure time for this route is 10:00AM, with 51% of flights per day taking off at noon.
How many flights depart from State of Washington to Illinois on average per week?
As of June 2025, 709 flights take off from State of Washington and land in Illinois each week. The most common flight departure day for this route is Thu, with 19% of weekly flights taking off on this day.
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
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?
The number of operators available for flights from Washington to Illinois is 8 as of June 2025.
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?
momondo data reveals that the most frequently booked plane model on the route from State of Washington to Illinois is Boeing 737-900 Passenger/BBJ3 (winglets), representing 17.51% of all bookings. The subsequent popular models are Boeing 737-800 at 14.29%, Boeing 737-800 Passenger/BBJ2 (winglets) at 11.80%, and Boeing 737 MAX 9 at 11.40%.
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 | ||
|---|---|---|---|---|---|
| PriceFrom $107 | Free Cancellation | Rating 6.3 8,088 reviews | |||
| PriceFrom $119 | Free Cancellation | Rating 7.8 2,522 reviews | |||
| PriceFrom $126 | Free Cancellation | Rating 8.0 7,963 reviews | |||
| PriceFrom $137 | Free Cancellation | Rating 5.9 3,296 reviews | |||
| PriceFrom $160 | Free Cancellation | Rating 7.4 8,838 reviews | |||
| PriceFrom $168 | Free Cancellation | Rating 8.0 10,000 reviews | |||
| PriceFrom $169 | Free Cancellation | Rating 7.2 10,000 reviews | |||
| PriceFrom $170 | Free Cancellation | Rating 8.0 4,276 reviews |
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.