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Cheap flights from Illinois to Washington, D.C. from $70

This is the cheapest one-way flight price found by a momondo user in the last 72 hours by searching for a flight from Illinois to Washington, D.C. departing on 1/24. 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

Enter your travel dates to find the best prices.
Multiple Airlines Logo
5:50 am - 3:27 pm
ORD
-
IAD
8h 37m1 stop
Multiple Airlines Logo
10:08 pm - 11:22 am
IAD
-
ORD
14h 14m2 stops
$157Multiple Airlines
Mon, Jan 12 - Mon, Jan 19
Frontier Logo
8:19 pm - 1:03 pm
MDW
-
IAD
15h 44m1 stop
Frontier Logo
10:08 pm - 7:27 am
IAD
-
MDW
10h 19m1 stop
$160Frontier
Thu, Jan 15 - Fri, Jan 16
Multiple Airlines Logo
6:57 pm - 1:03 pm
ORD
-
IAD
17h 06m1 stop
Multiple Airlines Logo
6:00 am - 12:08 pm
IAD
-
ORD
7h 08m1 stop
$160Multiple Airlines
Thu, Jan 15 - Sun, Jan 18
Frontier Logo
6:20 am - 4:28 pm
MDW
-
IAD
9h 08m1 stop
Frontier Logo
5:33 pm - 10:19 pm
IAD
-
MDW
5h 46m1 stop
$162Frontier
Thu, Jan 22 - Mon, Jan 26
Delta Logo
5:11 pm - 11:37 pm
MLI
-
IAD
5h 26m1 stop
Delta Logo
6:15 pm - 10:33 pm
IAD
-
MLI
5h 18m1 stop
$251Delta
Sat, Jan 10 - Tue, Jan 13
Delta Logo
12:00 pm - 5:17 pm
STL
-
IAD
4h 17m1 stop
Delta Logo
5:26 pm - 8:43 pm
IAD
-
STL
4h 17m1 stop
$251Delta
Tue, Jan 13 - Tue, Jan 20
United Airlines Logo
10:47 am - 4:00 pm
MLI
-
IAD
4h 13m1 stop
United Airlines Logo
5:17 pm - 9:36 pm
IAD
-
MLI
5h 19m1 stop
$253United Airlines
Thu, Jan 15 - Mon, Jan 19
American Airlines Logo
10:17 am - 5:16 pm
STL
-
IAD
5h 59m1 stop
American Airlines Logo
11:34 am - 3:04 pm
IAD
-
STL
4h 30m1 stop
$255American Airlines
Tue, Jan 13 - Tue, Jan 20
American Airlines Logo
5:29 pm - 11:42 pm
PIA
-
IAD
5h 13m1 stop
American Airlines Logo
11:34 am - 4:59 pm
IAD
-
PIA
6h 25m1 stop
$259American Airlines
Sat, Jan 17 - Mon, Jan 26
United Airlines Logo
6:30 am - 11:46 am
PIA
-
IAD
4h 16m1 stop
United Airlines Logo
8:20 am - 12:38 pm
IAD
-
PIA
5h 18m1 stop
$269United Airlines
Thu, Jan 8 - Fri, Jan 16

United Airlines flights from Illinois to Washington, D.C. Dulles Intl Airport

Our best United Airlines deals on Illinois to Washington, D.C. Dulles Intl Airport flight tickets
United Airlines
Jan 17
ORD8:52 amChicago O'Hare Intl
1h 54m
IAD11:46 amWashington, D.C. Dulles Intl
Jan 18
IAD8:20 amWashington, D.C. Dulles Intl
2h 23m
ORD9:43 amChicago O'Hare Intl
$223
Find similar
United Airlines
Jan 13
ORD1:00 pmChicago O'Hare Intl
2h 00m
IAD4:00 pmWashington, D.C. Dulles Intl
Jan 20
IAD8:20 amWashington, D.C. Dulles Intl
2h 23m
ORD9:43 amChicago O'Hare Intl
$227
Find similar
United Airlines
Dec 25
STL9:55 amLambert-St Louis
5h 29m
1 stop
IAD4:24 pmWashington, D.C. Dulles Intl
Dec 31
IAD5:50 pmWashington, D.C. Dulles Intl
2h 32m
STL7:22 pmLambert-St Louis
$237
Find similar

Frontier flights from Illinois to Washington, D.C. Dulles Intl Airport

Our best Frontier deals on Illinois to Washington, D.C. Dulles Intl Airport flight tickets
Frontier
Jan 15
MDW8:19 pmChicago Midway
15h 44m
1 stop
IAD1:03 pmWashington, D.C. Dulles Intl
Jan 16
IAD10:08 pmWashington, D.C. Dulles Intl
10h 19m
1 stop
MDW7:27 amChicago Midway
$160
Find similar
Frontier
Jan 22
MDW6:20 amChicago Midway
9h 08m
1 stop
IAD4:28 pmWashington, D.C. Dulles Intl
Jan 26
IAD5:33 pmWashington, D.C. Dulles Intl
5h 46m
1 stop
MDW10:19 pmChicago Midway
$162
Find similar
Frontier
Jan 8
ORD8:27 pmChicago O'Hare Intl
10h 28m
1 stop
IAD7:55 amWashington, D.C. Dulles Intl
Jan 12
IAD6:00 amWashington, D.C. Dulles Intl
6h 35m
1 stop
ORD11:35 amChicago O'Hare Intl
$163
Find similar

momondo Fare Finder

 
Customize your flight search to find flights from Illinois to Washington, D.C. Dulles Intl Airport 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 December 16, 2025.
Use the filters below to find and compare flights from Illinois to Washington, D.C. Dulles Intl Airport that are best for you.

Fly from

Fly to

Route

Depart

Return

Price

ChicagoWashington, D.C.

ORD - IAD

ORDIAD

Chicago O'Hare Intl

Mon 1/12

5:50 am-3:27 pm

1 stop8h 37m

Washington, D.C. Dulles Intl

Mon 1/19

10:08 pm-11:22 am

2 stops14h 14m

$157

ChicagoWashington, D.C.

MDW - IAD

MDWIAD

Chicago Midway

Thu 1/15

8:19 pm-1:03 pm

1 stop15h 44m

Washington, D.C. Dulles Intl

Fri 1/16

10:08 pm-7:27 am

1 stop10h 19m

$160

ChicagoWashington, D.C.

ORD - IAD

ORDIAD

Chicago O'Hare Intl

Thu 1/15

6:57 pm-1:03 pm

1 stop17h 06m

Washington, D.C. Dulles Intl

Sun 1/18

6:00 am-12:08 pm

1 stop7h 08m

$160

ChicagoWashington, D.C.

MDW - IAD

MDWIAD

Chicago Midway

Thu 1/22

6:20 am-4:28 pm

1 stop9h 08m

Washington, D.C. Dulles Intl

Mon 1/26

5:33 pm-10:19 pm

1 stop5h 46m

$162

MolineWashington, D.C.

MLI - IAD

MLIIAD

Moline Quad-City

Sat 1/10

5:11 pm-11:37 pm

1 stop5h 26m

Washington, D.C. Dulles Intl

Tue 1/13

6:15 pm-10:33 pm

1 stop5h 18m

$251

St. LouisWashington, D.C.

STL - IAD

STLIAD

Lambert-St Louis

Tue 1/13

12:00 pm-5:17 pm

1 stop4h 17m

Washington, D.C. Dulles Intl

Tue 1/20

5:26 pm-8:43 pm

1 stop4h 17m

$251

MolineWashington, D.C.

MLI - IAD

MLIIAD

Moline Quad-City

Thu 1/15

10:47 am-4:00 pm

1 stop4h 13m

Washington, D.C. Dulles Intl

Mon 1/19

5:17 pm-9:36 pm

1 stop5h 19m

$253

St. LouisWashington, D.C.

STL - IAD

STLIAD

Lambert-St Louis

Tue 1/13

10:17 am-5:16 pm

1 stop5h 59m

Washington, D.C. Dulles Intl

Tue 1/20

11:34 am-3:04 pm

1 stop4h 30m

$255

PeoriaWashington, D.C.

PIA - IAD

PIAIAD

Greater Peoria

Sat 1/17

5:29 pm-11:42 pm

1 stop5h 13m

Washington, D.C. Dulles Intl

Mon 1/26

11:34 am-4:59 pm

1 stop6h 25m

$259

PeoriaWashington, D.C.

PIA - IAD

PIAIAD

Greater Peoria

Thu 1/8

6:30 am-11:46 am

1 stop4h 16m

Washington, D.C. Dulles Intl

Fri 1/16

8:20 am-12:38 pm

1 stop5h 18m

$269

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 Washington, D.C. from

How to get the cheapest flight ticket from Illinois to Washington, D.C. Dulles Intl Airport

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 Washington, D.C. Dulles Intl Airport?

In general, August is the cheapest month to fly from Illinois to Washington, D.C. Dulles Intl Airport. Due to it being the ‘off-season’ during this time, you can expect flight prices to be around $229. If you aren’t able to travel to Washington, D.C. Dulles Intl Airport during the month of August, then flying in September is also cheap. Prices for this month can be found on momondo for an average of $238.

What is the cheapest day to depart on your flight to Washington, D.C. Dulles Intl Airport?

Our data shows that Friday is the least expensive day to fly to Washington, D.C. Dulles Intl Airport. Tickets to fly out on this day can be as low as $590. When flying out on a Sunday, the most expensive travel day of the week, you can expect to see flight prices from Illinois to Washington, D.C. Dulles Intl Airport for around $807.

What is the cheapest time of day to depart on your flight to Washington, D.C. Dulles Intl Airport?

Flying to Washington, D.C. Dulles Intl Airport from Illinois in the morning is the least expensive time of day to depart. momondo users have found prices as low as $474 when looking at flights departing in the morning. If you have a flexible travel schedule, then try to avoid flying at noon when prices are $980 on average. Flights to Washington, D.C. Dulles Intl Airport from Illinois at noon are generally more expensive because this time of day is more convenient for travelers’ schedules.

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

Fly from Chicago O'Hare Intl to Washington, D.C. Dulles Intl for the best Illinois - Washington, D.C. Dulles Intl flight prices

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

You are more likely to see cheaper flights to Washington, D.C. Dulles Intl Airport from Illinois when booking weeks ahead of your departure date. In general, you can expect to find flights to Washington, D.C. Dulles Intl Airport for around $311 when searching weeks out. However, flight prices might be lower outside of this timeframe. For example, people recently found flights to Washington, D.C. Dulles Intl Airport from Illinois for as low as $254 on momondo.

What cabin class options are available on Illinois to Washington, D.C. Dulles Intl flights?

There are 4 cabin classes available to choose from on Illinois to Washington, D.C. Dulles Intl 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 Illinois to Washington, D.C. Dulles Intl Airport flights?

No. A direct flight is the cheapest option for a flight between Illinois to Washington, D.C. Dulles Intl Airport.

Cheap Illinois to Washington, D.C. Dulles Intl Airport flight deals and tips

Find info about flight duration, direct flights, and airports for your flight from Illinois to Washington, D.C. Dulles Intl Airport

Best Price Found

$211

Fastest flight time

1h 44m

Direct flights

Every day
The best one-way flight to Washington, D.C. Dulles Intl Airport from Illinois in the past 72 hours is $211. The best round-trip flight deal from Illinois to Washington, D.C. Dulles Intl Airport found on momondo in the last 72 hours is $662.
The fastest flight from Illinois to Washington, D.C. Dulles Intl Airport takes 1h 44m
Direct flights go from Illinois to Washington, D.C. Dulles Intl Airport every day.
Search flight deals

  • When did momondo last update prices for flights from Illinois to Washington, D.C. Dulles Intl Airport?

    Prices for flights from Illinois to Washington, D.C. Dulles Intl Airport were last updated today.

  • How many operators does momondo search for flights from Illinois to Washington, D.C. Dulles Intl Airport?

  • How old do you have to be to fly from Illinois to Washington, D.C. Dulles Intl Airport?

    The minimum age for a child to fly alone is five, but airlines that offer an unaccompanied minor (UNMR) service may have their own age limitations. Flight duration, scheduling, and layovers are among the considerations that may influence age limits. We recommend that you double-check with the airline you are booking with for travel from Illinois to Washington, D.C. Dulles Intl Airport.

  • What documentation or ID do you need to fly to Washington, D.C. Dulles Intl Airport?

    The travel and health documents required for your trip to Washington, D.C. Dulles Intl Airport can vary based on your itinerary and personal situation. As a rule, consider having multiple documents such as a national ID card or driver’s license, and a passport valid for six-months after you plan to arrive at Washington, D.C. Dulles Intl Airport. We always recommend checking with your airline or a trusted third party such as IATA to get advice.

  • What is the most popular plane model from Illinois to Washington, D.C. Dulles Intl Airport?

Best airlines flying from Illinois to Washington, D.C. Dulles Intl Airport

Compare and see reviews for airlines that fly from Illinois to Washington, D.C. Dulles Intl Airport with momondo
Airline
Rating
Free Cancellation
Price
FrontierPriceFrom $103Free CancellationRating
5.8
3,082 reviews
Search Frontier flights
United AirlinesPriceFrom $197Free CancellationRating
7.4
9,094 reviews
Search United Airlines flights
American AirlinesPriceFrom $258Free CancellationRating
7.2
11,047 reviews
Search American Airlines flights

Traveling to a place near Washington, D.C.?

Book flights to Washington, D.C. if you plan to visit one of these locations
Alexandria
National Harbor
Gettysburg
Arlington
Winchester
Woodbridge
Waldorf
Tysons
Laurel
Colonial Beach
Silver Spring
Fredericksburg
Towson
Harpers Ferry
Rockville
Gaithersburg
Reston
Manassas
Sterling
Fairfax

Why use momondo?

Why should I use momondo to find a flight deal from Illinois to Washington, D.C.?

It is quick and easy to find Illinois to Washington, D.C. 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 Washington, D.C. that suits you.

Can I find flights from Illinois to Washington, D.C. with flexible booking policies on momondo?

All flight searches from Illinois to Washington, D.C. on momondo can be filtered to show those which offer flexible booking policies.

How can momondo help me find flights from Illinois to Washington, D.C.?

Once all potential Illinois to Washington, D.C. flight options are in front of you, momondo lets you sort and filter flights based on preferences such as airline, price and flight times amongst many other options.

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

Yes momondo offers price alerts on flights to Washington, D.C. from Illinois. After performing a search on this page you should be able to see the price alert set up feature. Simply provide a valid email address and momondo will instantly alert you when prices change.

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