$59 Find Cheap Flights from Washington Dulles Airport to Illinois

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 6/2. 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.
1 adult
1 adult, Economy, 0 bags

KAYAK searches hundreds of travel sites at once for deals on flights to Illinois

 
These are the airlines KAYAK users have selected most often from within our search results in flight searches from Washington, D.C. to Illinois, as well as popular online travel agencies
These are the airlines KAYAK users have selected most often from within our search results in flight searches from Washington, D.C. to Illinois, as well as popular online travel agencies
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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$221
Moline
Moline1 stop$261
Peoria
Peoria1 stop$242
Bloomington
Bloomington1 stop$339
Champaign
Champaign1 stop$430
Springfield
Springfield2 stops$407
St. Louis
St. Louisnonstop$261
Marion
Marion2 stops$1,148
Paducah
Paducah1 stop$294
Chicago
Chicago1 stop$221
Moline
Moline1 stop$261
Peoria
Peoria1 stop$242
Bloomington
Bloomington1 stop$339
Champaign
Champaign1 stop$430
Springfield
Springfield2 stops$407
St. Louis
St. Louisnonstop$261
Marion
Marion2 stops$1,148
Paducah
Paducah1 stop$294

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

Mon, May 18 - Tue, May 26
Multiple Airlines Logo
7:27 pm - 11:13 pm
IAD
-
ORD
28h 46m
1 stop
Multiple Airlines Logo
4:06 pm - 5:27 pm
ORD
-
IAD
24h 21m
2 stops
$221Multiple Airlines
Fri, May 15 - Mon, May 18
Frontier Logo
11:12 am - 10:02 pm
IAD
-
MDW
11h 50m
1 stop
Frontier Logo
12:04 pm - 11:09 pm
MDW
-
IAD
10h 05m
1 stop
$222Frontier
Thu, May 14 - Mon, May 18
Frontier Logo
11:07 am - 7:51 pm
IAD
-
ORD
9h 44m
1 stop
Frontier Logo
1:59 pm - 11:09 pm
ORD
-
IAD
8h 10m
1 stop
$223Frontier
Sat, May 23 - Tue, May 26
Delta Logo
4:24 pm - 9:46 pm
IAD
-
ORD
6h 22m
1 stop
Delta Logo
6:07 am - 12:18 pm
ORD
-
IAD
5h 11m
1 stop
$228Delta
Wed, Jun 3 - Thu, Jun 4
Delta Logo
5:33 pm - 9:09 pm
IAD
-
MDW
4h 36m
1 stop
Delta Logo
6:23 am - 2:10 pm
MDW
-
IAD
6h 47m
1 stop
$228Delta
Mon, May 25 - Wed, May 27
United Airlines Logo
9:00 am - 10:27 am
IAD
-
STL
2h 27mnonstop
United Airlines Logo
5:29 pm - 12:59 am
STL
-
IAD
6h 30m
1 stop
$261United Airlines
Sat, May 23 - Tue, May 26
United Airlines Logo
5:55 pm - 7:26 pm
IAD
-
STL
2h 31mnonstop
United Airlines Logo
5:29 pm - 12:59 am
STL
-
IAD
6h 30m
1 stop
$272United Airlines
Fri, May 29 - Fri, Jun 5
American Airlines Logo
6:18 am - 11:54 am
IAD
-
PIA
6h 36m
1 stop
American Airlines Logo
12:24 pm - 12:13 am
PIA
-
IAD
10h 49m
2 stops
$316American Airlines
Thu, May 14 - Tue, May 19
American Airlines Logo
8:11 pm - 11:52 pm
IAD
-
PIA
4h 41m
1 stop
American Airlines Logo
5:39 pm - 11:06 pm
PIA
-
IAD
4h 27m
1 stop
$339American Airlines
Sun, Jun 14 - Sun, Jun 21
Allegiant Air Logo
6:20 pm - 8:50 am
IAD
-
PIA
15h 30m
1 stop
Allegiant Air Logo
9:31 am - 2:29 pm
PIA
-
IAD
27h 58m
2 stops
$382Allegiant Air
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 May.

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 72 hours was to Chicago, at $272 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 72 hours was $272.

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 $419 on average. On average, there is no price difference when choosing to fly in the morning or the evening on this flight route. 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 $458.

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 $366 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 January, when tickets cost $38 (return) on average. On the other hand, the most expensive months are March and February, when the average cost of round-trip tickets is $197 and $138 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 Friday 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 Sundays.

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 56% compared to booking last minute. For the absolute cheapest price, our data suggests you should book 17 weeks before departure.

Good to know

Low seasonFebruary
Cheapest flight$59
Best time to beat the crowds with an average 13% drop in price.
Most popular time to fly and prices are also 20% lower on average.
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.
7.9
DeltaOverall score based on 8464 reviews
7.2Food
8.1Boarding
8.5Crew
7.9Comfort
7.8Entertainment
Airline reviews

Seats in Delta Main are unbelievably close to the seat in front of. Hard to get a backpack under the seat.

8.0 ExcellentMatthew, May 2026
OKC - ATL
Read more Delta reviews

Seats in Delta Main are unbelievably close to the seat in front of. Hard to get a backpack under the seat.

The agent at check in and at the gate were less than thrilled to be at work. I'm not a fan of Kayak's placement on the plane. I got put in the middle seat and none of my preferences were used.

In ATL they have two sets of departure screens. Follow what is on your airline's departure board - the ATL Airport Authority departure board had completely incorrect details about the gate assignment for my flight, which would have made me miss boarding.

Flight was delayed it was hot while sitting on the plane, one engine was working on the plane until they had to do some jimmy rigging down the runway in order for the other engine to charge up. It was ridiculous

The flight was very good and the staff was very friendly and helpful!

The only thing I would say is we tried to get on a standby earlier flight, but with our fair we couldn’t. That seems senseless to leave with open seats..

Very easy to use and convenient, you can perform any action within the same portal

In a world of delays, Delta was on time both ways! Boarding was fast and efficient. Staff was friendly. AND wifi worked.

WiFi didn’t work. Flight delayed 3 hours Crew members were illiterate Seat lean back did not work.

Flight was delayed, we could have been notified earlier and in a consistent manner. App was not refreshing for another passenger to get the latest flight status. We could have stayed and waited at the hotel instead of waiting at the airport had we known the flight was going to delayed for more than 5 hours. The toilet is too tight, and needs to be cleaned more frequently (every hour). The entertainment screen froze, the touch screen not responding to touch. We were upgraded to comfort, it is more comfortable than regular economy seats.

Vegetarian selection could be better. Bread was too hard to chew.

Crew was friendly and competent. Food, wine, and entertainment were excellent except the raw tuna on the flight to Split. Recommend against serving that - at least as the only option. Many medical conditions do not allow people to eat raw fish.

After arriving in Chicago, we were taxiing for 1.5 hours with infrequent and untruthful updates about the amount of time it would take to arrive at the gate. Minimally, the team could have provided timing expectations that were more truthful, especially one their original expectations were not met.

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.

Wonderful. Quick boarding. Early departure and we arrived 30 minutes early at our destination. Unfortunately, when you arrive early, there is still a departing aircraft at our gate. We had to park for 30 minutes until the gate was clear. So our early arrival was not really early at the gate. Otherwise it was a quick and smooth flight. Appreciated the efficiency.

Wifi took a while to kick in and we had a maintenance issue that took over 40 mins at the gate in Washington before pulling back

Very good. Because of the delays with my previous flight, I missed my connection, but I was able to book another flight through the United app easily.

Was happy we finally got upgraded in 1st class. The seat getting old. The cushiness need some improvement.

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

Plane was hot and miserable and the crew was rude!

12 hour delay required getting on and off plane 3 times - would have at least liked to have been offered a snack or drink

They didn’t offer a water, even after I asked

They switched our terminal 3 times and we were delayed for four plus hours!!!

It was an early flight and most people napped/slept and the crew let us which was nice.

The crew acted like they had never done this and kept barking passive aggressive orders at people. + the security line + the delay + sitting on the tarmac for 2 hours + none of the apps or signage updating with correct times

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

My flight was originally from SAT to MCO connecting from MCO to ORD. We got diverted to ATL and than Frontier staff there was sooo un helpful first they said they couldn’t give us any accommodation since our flight first got delayed that cancelled and now it’s 221am and I am still in ATL since they said they need to create a new flight my final destination is ORD and I have been delayed twice and cancelled. With no real help the frontier app didn’t work no email updates over all such a horrible experience

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

Information on your arrival and departure airports