$67 Find Cheap Flights from Washington Dulles Airport to Illinois - Compare and Save

This is the cheapest one-way flight price found by a KAYAK user in the last 72 hours by searching for a flight from Dulles Intl to Illinois departing on 8/30. Fares are subject to change and may not be available on all flights or dates of travel. Click the price to replicate the search for this deal.
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Cheap Flights from Dulles Intl to Illinois

Cheapest round-trip prices found by our users on KAYAK in the last 72 hours
Chicago
Chicago1 stop$196
Moline
Moline1 stop$271
Peoria
Peoria1 stop$306
Bloomington
Bloomington1 stop$319
Champaign
Champaign2 stops$291
Springfield
Springfield2 stops$511
St. Louis
St. Louis2 stops$244
Marion
Marion2 stops$785
Paducah
Paducah1 stop$304
Chicago
Chicago1 stop$196
Moline
Moline1 stop$271
Peoria
Peoria1 stop$306
Bloomington
Bloomington1 stop$319
Champaign
Champaign2 stops$291
Springfield
Springfield2 stops$511
St. Louis
St. Louis2 stops$244
Marion
Marion2 stops$785
Paducah
Paducah1 stop$304

Book Cheap Dulles Intl to Illinois Plane Tickets

 
Here are some of the best deals found on KAYAK recently from the most popular airlines for round-trip flights from Dulles Intl to Illinois that are departing in the next months. While these flights were available on KAYAK in the last 72 hours, prices and availability are subject to change and deals may expire.
Discover the best prices for you by selecting your travel dates on KAYAK.

Recent round-trip flight deals from Dulles Intl to Illinois

Thu, Sep 17 - Tue, Sep 22
Frontier Logo
7:50 am - 5:46 pm
IAD
-
MDW
10h 56m
1 stop
Frontier Logo
6:25 am - 5:18 pm
MDW
-
IAD
9h 53m
1 stop
$196Frontier
Mon, Nov 9 - Tue, Nov 10
Delta Logo
10:06 am - 2:38 pm
IAD
-
ORD
5h 32m
1 stop
Delta Logo
6:45 am - 2:05 pm
ORD
-
IAD
6h 20m
1 stop
$197Delta
Thu, Dec 10 - Mon, Dec 14
Delta Logo
10:06 am - 2:38 pm
IAD
-
ORD
5h 32m
1 stop
Delta Logo
3:49 pm - 9:36 pm
ORD
-
IAD
4h 47m
1 stop
$197Delta
Wed, Aug 19 - Mon, Aug 24
Frontier Logo
6:20 am - 8:08 pm
IAD
-
ORD
14h 48m
1 stop
Frontier Logo
7:05 am - 5:14 pm
ORD
-
IAD
9h 09m
1 stop
$198Frontier
Sat, Aug 22 - Sat, Aug 22
United Airlines Logo
8:20 am - 9:38 am
IAD
-
ORD
2h 18mnonstop
United Airlines Logo
2:30 pm - 5:37 pm
ORD
-
IAD
2h 07mnonstop
$203United Airlines
Thu, Oct 8 - Mon, Oct 12
United Airlines Logo
6:10 am - 7:25 am
IAD
-
ORD
2h 15mnonstop
United Airlines Logo
9:52 pm - 12:58 am
ORD
-
IAD
2h 06mnonstop
$214United Airlines
Mon, Sep 28 - Wed, Sep 30
American Airlines Logo
6:14 am - 9:29 am
IAD
-
STL
4h 15m
1 stop
American Airlines Logo
10:21 am - 5:31 pm
STL
-
IAD
6h 10m
1 stop
$257American Airlines
Mon, Sep 28 - Thu, Oct 1
American Airlines Logo
6:14 am - 9:29 am
IAD
-
STL
4h 15m
1 stop
American Airlines Logo
6:53 am - 11:56 am
STL
-
IAD
4h 03m
1 stop
$257American Airlines
Fri, Aug 21 - Sun, Aug 23
Multiple Airlines Logo
6:20 am - 5:22 pm
IAD
-
STL
12h 02m
1 stop
Multiple Airlines Logo
5:02 pm - 11:20 am
STL
-
IAD
17h 18m
2 stops
$270Multiple Airlines
Fri, Sep 4 - Mon, Sep 7
Multiple Airlines Logo
2:52 pm - 4:11 pm
IAD
-
STL
26h 19m
2 stops
Multiple Airlines Logo
4:23 pm - 10:07 am
STL
-
IAD
16h 44m
1 stop
$297Multiple Airlines
Booking Insights

KAYAK's insights & trends for Dulles Intl to Illinois flights

Get data-powered insights and trends into flights from Dulles Intl to Illinois to help you find the cheapest flights, the best time to fly and much more.

How much is a round-trip flight from Washington, D.C. Dulles Intl Airport to Illinois?

This analysis is based on the cheapest round-trip price found on KAYAK in the last 12 months by searching for a flight from Washington, D.C. Dulles Intl Airport to Illinois departing in August.

Flight prices are below average for this route right now.

Flights to Illinois from Washington, D.C. Dulles Intl Airport usually cost between $243 and $453 in August.
The lowest price found in the past 5 days was $197 on Delta (Aug 24-Aug 25).

What is the cheapest Washington, D.C. Dulles Intl Airport to Illinois flight route?

Data is based on round-trip flight searches on KAYAK over the past month.

The cheapest ticket to Illinois from Washington, D.C. Dulles Intl Airport found in the last 5 days was to Chicago, at $189 round-trip. The most popular route is from Washington, D.C. Dulles Intl Airport (IAD) to Chicago O'Hare Intl Airport (ORD), and the cheapest round-trip airline ticket found on this route in the last 5 days was $189.

What is the cheapest time of day to fly to Illinois?

The average price for all round-trip flights from Washington, D.C. Dulles Intl Airport to Illinois depending on the time of departure, clicked by users on KAYAK in the last 2 weeks.

The cheapest time of day to fly to Illinois is generally at night, when round-trip flights cost $435 on average. Morning departures are around 7% cheaper than evening flights, on average. The most expensive time of day to fly to Illinois is generally in the evening, which is peak travel time and where the average cost of a ticket is $501.

Can I save money by flying with a layover from Washington, D.C. Dulles Intl Airport to Illinois?

The average round-trip price for all non-stop flights, flights with one layover, and flights with two layovers for the route found by users searching on KAYAK in the last 2 weeks.

Yes, flying with a layover may cost you more time, but you can also save money on the route, with a 1 stop layover the cheapest option at $372 on average.

What is the cheapest month to fly from Washington, D.C. Dulles Intl Airport to Illinois?

To calculate monthly average prices, KAYAK takes all prices for each month over the last year for round-trip flights from Washington, D.C. Dulles Intl Airport to Illinois, removes the top 0.1% to account for outliers, and then takes the median of all values for each month.

The cheapest month for flights from Washington, D.C. Dulles Intl Airport to Illinois is September, when tickets cost $287 (return) on average. On the other hand, the most expensive months are March and January, when the average cost of round-trip tickets is $446 and $441 respectively.

What’s the cheapest day of the week to fly from Washington Dulles Airport to Illinois?

The average price of all round-trip flights from Washington, D.C. Dulles Intl Airport to Illinois clicked on KAYAK for each day over the last 12 months.

When flying from Washington Dulles Airport to Illinois, you should consider leaving on a Thursday and avoid Mondays if you are looking for the best rates. For your return to Washington Dulles Airport, you’ll find the best rates on Fridays and the most expensive ones on Tuesdays.

How far in advance should I book a flight from Washington, D.C. Dulles Intl Airport to Illinois?

To calculate weekly average prices, KAYAK takes all prices for each week before departure over the last year for round-trip flights from Washington, D.C. Dulles Intl Airport to Illinois, removes the top 0.1% to account for outliers, and then takes the average of all the values for each week.

To get a below average price on the flight from Washington, D.C. Dulles Intl Airport to Illinois, you should book around 4 weeks before departure, which saves you about 51% compared to booking last minute. For the absolute cheapest price, our data suggests you should book 17 weeks before departure.

Good to know

Low season

February

Cheapest flight

$67
Best time to beat the crowds with an average 15% drop in price.
Most popular time to fly with an average 21% increase in price.
Flight from Washington Dulles Airport to St. Louis

FAQs - booking Illinois flights

  • How does KAYAK find such low prices on flights from Washington Dulles Airport to Illinois?

    KAYAK is a travel search engine. That means we look across the web to find the best prices we can find for our users. With over 2 billion flight queries processed yearly, we are able to display a variety of prices and options on flights from Washington Dulles Airport to Illinois.

  • How does KAYAK's flight Price Forecast tool help me choose the right time to buy my flight ticket from Washington Dulles Airport to Illinois?

    KAYAK’s flight Price Forecast tool uses historical data to determine whether the price for a flight from Washington Dulles Airport to Illinois is likely to change within 7 days, so travelers know whether to wait or book now.

  • What is the Hacker Fare option on flights from Washington Dulles Airport to Illinois?

    Hacker Fares allow you to combine one-way tickets in order to save you money over a traditional round-trip ticket. You could then fly from Washington Dulles Airport to Illinois with an airline and back with another airline.

  • What is KAYAK's "flexible dates" feature and why should I care when looking for a flight from Washington Dulles Airport to Illinois?

    Sometimes travel dates aren't set in stone. If your preferred travel dates have some wiggle room, flexible dates will show you all the options when flying from Washington Dulles Airport to Illinois up to 3 days before/after your preferred dates. You can then pick the flights that suit you best.

Reviews of the top 3 airlines serving from Dulles Intl to Illinois

 
See real verified KAYAK customer reviews for airlines flying from Washington, D.C. to Illinois. Airline scores are aggregated from all reviews left by passengers on KAYAK after flying with an airline. KAYAK doesn’t show reviews that are older than 5 years. Learn how KAYAK collects reviews.
Need help choosing which airline to fly with from Dulles Intl to Illinois? KAYAK airline reviews give an overall score for each airline based on loads of factors, including comfort, boarding, in-flight entertainment and more, to make your decision easier. See airline scores according to verified KAYAK customer reviews.
7.8
DeltaOverall score based on 8498 reviews
7.8Comfort
8.1Boarding
7.2Food
7.8Entertainment
8.5Crew
Airline reviews

Flight was delayed for about an hour but overall good experience

8.0 ExcellentNana, Jul 2026
DCA - ATL
Read more Delta reviews

Flight was delayed for about an hour but overall good experience

It was as good as it could be. Flying is not a pleasant experience these days.

The gentleman at the gate I think his name is RIE was exceptional

This flight was no comparison to our prior flight. I'm thinking it all has to do with the age of the aircraft.

2 of the seats in row 31 the entertainment system was not working, and one seat the tray table did not go all the way down. Flight arrived early and departed on time which was great.

Waited at the usual crowded gate at DCA where one ends up standing up because there aren't enough seats.

Delayed take-off. Very small plane so very scary with lots of bumps during the flight. Would never fly Delta on short flights in small 80 seaters plane again! Felt relieved when landed.

Inexpensive, got an exit row aisle aeat with no middle passenger, bought a great breakfast sandwich, flight comfortable & arrived ahead of schedule.

I wouldn't say I liked being forced to check my small roller bag at the gate; too many people had bags and were in a higher boarding group.

715PM departure was 2.5 hours late. Received hotel & food voucher but after we already booked a room. Entire team just seemed like they were 2-3 steps behind in execution, and notifcations.

My flight was delayed so bad i missed u it so i just said never mind

Delayed 2 hours while stuck on the aircraft. If the luggage was properly loaded the first time we probably wouldn’t have been delayed at all

Onboard staff was courteous, helpful, responsive and friendly. The boarding process was disorganized, poorly communicated, and disheveled. Gate agents were yelling instead of using the PA system, didn’t communicate the timing delay of our flight, and created an atmosphere of chaos rather than order and communication. As far as I know, there was no reason for their. I would hate to see how it operated under extreme conditions. I’ve never seen United Airlines operations in such a state.

The flight did not have its customary snacks during the flight. Apparently they were never loaded on the plane.

Like: departed and arrived on time. Unlike: Food options for purchase allways bad, 1 of 2 of the crew members not very friendly at all. Seats and leg room aweful. At this point I am thinking on switching to AA.

United didn’t even try to hold the flight for me. They knew I had a tight connection and when I arrived at the gate less than 10 mins after final boarding the flight had already gone. The gate agent wasn’t even notified that I was on my way. She was told I wasn’t at the airport

Good quick flight on a small but comfortable plane. I'm 6'3 and had plenty of space.

The flight was delayed so we were dead tired, and after that the turbulence was horrible. I was very scared.

Better WiFi. I cannot understand that in 2025, United is so behind on a technology that is now a necessity and still painfully unreliable, slow and keeps disconnecting.

Almost 2 hour delay in boarding with all standing ready to board at original time. No explanation given.

Flight was scheduled at 9:40pm. Got delayed to 10 am, the next day. crazy

The bag check, flight check-in, and onboard experience convinced my wife and me that we will actively go out of our way to avoid flying Frontier Airlines in the future. At bag check, we were informed that check-in could only be completed via the Frontier mobile app. Unfortunately, the app was extremely frustrating—sending us through repetitive, confusing loops that repeatedly forced us to decline add-on services with nearly every click. While most airline apps upsell, this one felt intentionally exhausting. As the process dragged on, we became genuinely concerned that my phone battery would die before check-in could be completed. We approached the bag check staff—who were standing together talking—and explained both our frustration and our predicament. They laughed. Later, my wife described the interaction as “gaslighting,” which felt accurate. We were then informed it would cost $25 per person simply to have our boarding passes printed. From that point forward, the tone of the experience was consistently hostile. The bag check employees were condescending and combative, behaving more like bullies than customer service staff. Unfortunately, that same attitude continued onboard. One flight attendant argued with me when I attempted to stow my backpack in the overhead bin. I explained that we had each paid $75 to check our bags specifically so we would not need to use carry-on space and could have adequate legroom. She demanded to see my ticket, pointed out that it said “no carry-on”—which I acknowledged—and I reiterated that this was precisely why we paid to check our bags. Her response was, “I don’t make the rules.” She then walked away, but not before asking if I “truly wanted to fly back to Chicago today?”—an unnecessary and unmistakable threat. It is also worth noting that despite booking our tickets together in the same transaction, we were not seated together. Upon our return to Chicago—where we could once again sit together—we compared onboard experiences. We both remarked on how unhappy the flight attendants appeared and how each of us was separately asked whether we would like to purchase a beverage. We declined. At no point was water mentioned as an option, leaving us with the clear impression that even water came at a cost—or that complimentary water, if available at all, was deliberately left unmentioned. Overall, the experience was shocking and deeply disappointing, but it was also a profound learning experience—one we will not forget and will not repeat. -Steve

More inflight connection. And leg space is horrible. And the paying for baggage I'd ridiculous!!!

Frontier Airlines was AWFUL. I was an hour early for my flight and the lady refused to check me in. I had to purchase a whole new ticket with a different airline.

I missed a flight because of a delay. I had to buy a new ticket through Southwest.

Bag should not be so much money. This is how Frontier takes advantage of customers

Frontier is definitely a good option for people traveling light or on a budget - just remember to bring your own entertainment and your own headphones if you need them.

Never offer anything to drink ☹️ Flight delayed gate moved poor communication

It’s a cheap airline. I wish they had better seats.

Seats are cramped and very uncomfortable. You have to pay for everything and it is too expensive.

Everything you need to know for your flight from Dulles Intl to Illinois

Information on your arrival and departure airports