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

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 Illinois to Washington Dulles Airport.

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

KAYAK’s flight Price Forecast tool uses historical data to determine whether the price for a flight to Washington Dulles Airport from 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 Illinois to Washington Dulles Airport?

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 to Washington Dulles Airport with an airline and back to Illinois with another airline.

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

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 to Washington Dulles Airport from Illinois up to 3 days before/after your preferred dates. You can then pick the flights that suit you best.

$61 CHEAP FLIGHTS from Illinois to Washington Dulles (IAD)

Save 21% or more on flights. Compare deals from all over the web.

Never overpay with our price tracking tools.

Filter searches by price, airline and more to find your best flights.

Flight Deals

Cheap Flights from Illinois to Dulles Intl

Discover the best prices for you by selecting your travel dates on KAYAK.

Round-trip

One-way

Last minute

Direct

Recent round-trip flight deals from Illinois to Dulles Intl

Sat, Oct 3 - Mon, Oct 5

6:25 am - 5:18 pmMDW Chicago Midway-IAD Washington, D.C. Dulles Intl

9h 53m1 stop Atlanta Hartsfield-Jackson

7:50 am - 5:51 pmIAD Washington, D.C. Dulles Intl-MDW Chicago Midway

11h 01m1 stop Atlanta Hartsfield-Jackson

$179Frontier

Sat, Oct 10 - Mon, Oct 19

6:21 am - 5:13 pmMDW Chicago Midway-IAD Washington, D.C. Dulles Intl

9h 52m1 stop Atlanta Hartsfield-Jackson

9:06 pm - 11:43 pmIAD Washington, D.C. Dulles Intl-MDW Chicago Midway

27h 37m1 stop Atlanta Hartsfield-Jackson

$183Frontier

Mon, Dec 7 - Thu, Dec 17

6:05 pm - 11:23 pmSTL Lambert-St Louis-IAD Washington, D.C. Dulles Intl

4h 18m1 stop Detroit Metropolitan Wayne County

6:00 am - 9:23 amIAD Washington, D.C. Dulles Intl-STL Lambert-St Louis

4h 23m1 stop Detroit Metropolitan Wayne County

$237Delta

Thu, Dec 10 - Sat, Dec 12

6:00 am - 11:39 amSTL Lambert-St Louis-IAD Washington, D.C. Dulles Intl

4h 39m1 stop Atlanta Hartsfield-Jackson

6:00 am - 9:23 amIAD Washington, D.C. Dulles Intl-STL Lambert-St Louis

4h 23m1 stop Detroit Metropolitan Wayne County

$237Delta

Thu, Oct 29 - Sat, Oct 31

5:00 am - 11:52 amSTL Lambert-St Louis-IAD Washington, D.C. Dulles Intl

5h 52m1 stop Chicago O'Hare Intl

8:23 am - 12:12 pmIAD Washington, D.C. Dulles Intl-STL Lambert-St Louis

4h 49m1 stop Chicago O'Hare Intl

$237United Airlines

Mon, Oct 5 - Wed, Oct 7

3:11 pm - 9:11 pmSTL Lambert-St Louis-IAD Washington, D.C. Dulles Intl

5h 00m1 stop Chicago O'Hare Intl

8:20 am - 12:13 pmIAD Washington, D.C. Dulles Intl-STL Lambert-St Louis

4h 53m1 stop Chicago O'Hare Intl

$237United Airlines

Wed, Oct 21 - Tue, Oct 27

9:51 am - 10:17 amPIA Greater Peoria-IAD Washington, D.C. Dulles Intl

23h 26m1 stop Orlando Sanford Intl

11:16 am - 9:01 amIAD Washington, D.C. Dulles Intl-PIA Greater Peoria

22h 45m1 stop Orlando

$257Multiple Airlines

Sun, Oct 18 - Tue, Oct 27

3:04 pm - 12:07 pmPIA Greater Peoria-IAD Washington, D.C. Dulles Intl

20h 03m1 stop Valparaiso Destin-Ft Walton Beach

11:16 am - 9:01 amIAD Washington, D.C. Dulles Intl-PIA Greater Peoria

22h 45m1 stop Orlando

$258Multiple Airlines

Tue, Oct 13 - Thu, Oct 15

3:30 pm - 8:46 pmSTL Lambert-St Louis-IAD Washington, D.C. Dulles Intl

4h 16m1 stop Charlotte Douglas

5:01 am - 8:37 amIAD Washington, D.C. Dulles Intl-STL Lambert-St Louis

4h 36m1 stop Charlotte Douglas

$275American Airlines

Sat, Nov 14 - Thu, Nov 19

6:00 am - 11:17 amSTL Lambert-St Louis-IAD Washington, D.C. Dulles Intl

4h 17m1 stop Charlotte Douglas

1:24 pm - 7:08 pmIAD Washington, D.C. Dulles Intl-STL Lambert-St Louis

6h 44m1 stop Charlotte Douglas

$275American Airlines

Recent last minute flight deals from Illinois to Dulles Intl

Wed, Sep 16 - Wed, Oct 21

6:20 am - 5:18 pmORD Chicago O'Hare Intl-IAD Washington, D.C. Dulles Intl

9h 58m1 stop Atlanta Hartsfield-Jackson

12:30 pm - 7:07 pmIAD Washington, D.C. Dulles Intl-ORD Chicago O'Hare Intl

7h 37m1 stop Dallas/Fort Worth

$255Frontier

Sat, Sep 19 - Sat, Oct 3

3:50 pm - 10:27 amORD Chicago O'Hare Intl-IAD Washington, D.C. Dulles Intl

17h 37m1 stop Orlando

9:33 am - 10:59 pmIAD Washington, D.C. Dulles Intl-ORD Chicago O'Hare Intl

14h 26m1 stop Orlando

$255Frontier

Wed, Sep 16 - Tue, Sep 22

5:16 pm - 12:41 amMLI Moline Quad-City-IAD Washington, D.C. Dulles Intl

6h 25m1 stop Atlanta Hartsfield-Jackson

10:15 am - 4:22 pmIAD Washington, D.C. Dulles Intl-MLI Moline Quad-City

7h 07m1 stop Atlanta Hartsfield-Jackson

$357Delta

Tue, Sep 15 - Sat, Sep 19

5:16 pm - 12:41 amMLI Moline Quad-City-IAD Washington, D.C. Dulles Intl

6h 25m1 stop Atlanta Hartsfield-Jackson

6:07 pm - 10:30 pmIAD Washington, D.C. Dulles Intl-MLI Moline Quad-City

5h 23m1 stop Atlanta Hartsfield-Jackson

$357Delta

Wed, Sep 16 - Sat, Sep 19

10:42 am - 4:01 pmMLI Moline Quad-City-IAD Washington, D.C. Dulles Intl

4h 19m1 stop Chicago O'Hare Intl

6:15 am - 10:07 amIAD Washington, D.C. Dulles Intl-MLI Moline Quad-City

4h 52m1 stop Chicago O'Hare Intl

$357United Airlines

Sun, Sep 20 - Mon, Sep 21

7:11 am - 8:09 pmORD Chicago O'Hare Intl-IAD Washington, D.C. Dulles Intl

11h 58m1 stop Fort Lauderdale

6:36 pm - 10:59 pmIAD Washington, D.C. Dulles Intl-ORD Chicago O'Hare Intl

29h 23m2 stops Blountville Tri Cities TN/VA Orlando

$367Multiple Airlines

Sun, Sep 20 - Mon, Sep 21

7:11 am - 8:09 pmORD Chicago O'Hare Intl-IAD Washington, D.C. Dulles Intl

11h 58m1 stop Fort Lauderdale

6:36 pm - 10:59 pmIAD Washington, D.C. Dulles Intl-ORD Chicago O'Hare Intl

29h 23m2 stops Blountville Tri Cities TN/VA Orlando

$375Multiple Airlines

Tue, Sep 15 - Wed, Oct 14

10:50 am - 1:55 pmORD Chicago O'Hare Intl-IAD Washington, D.C. Dulles Intl

2h 05mnonstop

5:20 pm - 6:41 pmIAD Washington, D.C. Dulles Intl-ORD Chicago O'Hare Intl

2h 21mnonstop

$398United Airlines

Tue, Sep 15 - Wed, Sep 30

6:18 am - 12:11 pmPIA Greater Peoria-IAD Washington, D.C. Dulles Intl

4h 53m1 stop Charlotte Douglas

6:15 pm - 10:57 pmIAD Washington, D.C. Dulles Intl-PIA Greater Peoria

5h 42m1 stop Charlotte Douglas

$422American Airlines

Tue, Sep 15 - Mon, Oct 5

4:27 pm - 10:51 pmPIA Greater Peoria-IAD Washington, D.C. Dulles Intl

5h 24m1 stop Charlotte Douglas

7:15 pm - 11:56 pmIAD Washington, D.C. Dulles Intl-PIA Greater Peoria

5h 41m1 stop Charlotte Douglas

$422American Airlines

Recent direct flight deals from Illinois to Dulles Intl

Mon, Nov 9 - Sat, Nov 14

8:00 am - 11:10 amSTL Lambert-St Louis-IAD Washington, D.C. Dulles Intl

2h 10mnonstop

8:40 am - 10:12 amIAD Washington, D.C. Dulles Intl-STL Lambert-St Louis

2h 32mnonstop

$255United Airlines

Tue, Oct 6 - Sat, Oct 10

8:30 am - 11:46 amSTL Lambert-St Louis-IAD Washington, D.C. Dulles Intl

2h 16mnonstop

5:55 pm - 7:21 pmIAD Washington, D.C. Dulles Intl-STL Lambert-St Louis

2h 26mnonstop

$277United Airlines

Wed, Nov 11 - Sat, Nov 14

1:00 pm - 4:09 pmSTL Lambert-St Louis-IAD Washington, D.C. Dulles Intl

2h 09mnonstop

8:40 am - 10:12 amIAD Washington, D.C. Dulles Intl-STL Lambert-St Louis

2h 32mnonstop

$297United Airlines

Mon, Nov 9 - Sat, Nov 14

1:00 pm - 4:09 pmSTL Lambert-St Louis-IAD Washington, D.C. Dulles Intl

2h 09mnonstop

8:40 am - 10:12 amIAD Washington, D.C. Dulles Intl-STL Lambert-St Louis

2h 32mnonstop

$297United Airlines

Tue, Nov 10 - Sat, Nov 14

1:00 pm - 4:09 pmSTL Lambert-St Louis-IAD Washington, D.C. Dulles Intl

2h 09mnonstop

8:40 am - 10:12 amIAD Washington, D.C. Dulles Intl-STL Lambert-St Louis

2h 32mnonstop

$297United Airlines

Tue, Oct 6 - Thu, Oct 8

10:54 am - 1:59 pmORD Chicago O'Hare Intl-IAD Washington, D.C. Dulles Intl

2h 05mnonstop

10:18 pm - 11:32 pmIAD Washington, D.C. Dulles Intl-ORD Chicago O'Hare Intl

2h 14mnonstop

$299United Airlines

Wed, Oct 28 - Wed, Nov 4

8:50 am - 11:52 amORD Chicago O'Hare Intl-IAD Washington, D.C. Dulles Intl

2h 02mnonstop

5:29 pm - 6:54 pmIAD Washington, D.C. Dulles Intl-ORD Chicago O'Hare Intl

2h 25mnonstop

$299United Airlines

Wed, Sep 30 - Thu, Oct 1

10:54 am - 1:59 pmORD Chicago O'Hare Intl-IAD Washington, D.C. Dulles Intl

2h 05mnonstop

10:18 pm - 11:32 pmIAD Washington, D.C. Dulles Intl-ORD Chicago O'Hare Intl

2h 14mnonstop

$299United Airlines

Sat, Oct 3 - Mon, Oct 5

10:54 am - 1:59 pmORD Chicago O'Hare Intl-IAD Washington, D.C. Dulles Intl

2h 05mnonstop

8:20 am - 9:38 amIAD Washington, D.C. Dulles Intl-ORD Chicago O'Hare Intl

2h 18mnonstop

$299United Airlines

Sat, Oct 10 - Mon, Oct 19

9:45 pm - 12:50 amORD Chicago O'Hare Intl-IAD Washington, D.C. Dulles Intl

2h 05mnonstop

6:10 am - 7:25 amIAD Washington, D.C. Dulles Intl-ORD Chicago O'Hare Intl

2h 15mnonstop

$299United Airlines

Useful Info

Low season	January
High season	October
Cheapest flight	$61

Best time to beat the crowds with an average 4% drop in price.

Most popular time to fly and prices are also 12% lower on average.

Flight from St. Louis to Washington Dulles Airport

How does KAYAK find such low prices on flights from Illinois to Washington Dulles Airport?
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 Illinois to Washington Dulles Airport.
How does KAYAK's flight Price Forecast tool help me choose the right time to buy my flight ticket from Illinois to Washington Dulles Airport?
KAYAK’s flight Price Forecast tool uses historical data to determine whether the price for a flight to Washington Dulles Airport from 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 Illinois to Washington Dulles Airport?
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 to Washington Dulles Airport with an airline and back to Illinois with another airline.
What is KAYAK's "flexible dates" feature and why should I care when looking for a flight from Illinois to Washington Dulles Airport?
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 to Washington Dulles Airport from Illinois up to 3 days before/after your preferred dates. You can then pick the flights that suit you best.

Winchester

Linthicum Heights

Hanover

Springfield

Gaithersburg

Towson

Martinsburg

Oxon Hill

Owings Mills

Charles Town

Greenbelt

Glen Burnie

Edgewood

Chesapeake Beach

Camp Springs

Ellicott City

Pikesville

Hunt Valley

Colonial Beach

Capitol Heights

More options for your flight to Dulles Intl

Add a hotel or car rental

Airports

Cabin class

Direct Flights

Origins

Other airports

Other destinations

Return flight

Complete your trip to Dulles Intl with a hotel stay or car rental

Car rentals in Washington, D.C.

Hotels in Washington, D.C.

Vacations in Washington, D.C.

IAD

$61 Find Cheap Flights from Illinois to Washington Dulles Airport - Compare and Save

Cheap Flights from Illinois to Dulles Intl

Recent round-trip flight deals from Illinois to Dulles Intl

Recent one-way flight deals from Illinois to Dulles Intl

Recent last minute flight deals from Illinois to Dulles Intl

Recent direct flight deals from Illinois to Dulles Intl

Good to know

Low season

High season

Cheapest flight

FAQs for booking Illinois to Washington Dulles Airport flights

Traveling to a place near Dulles Intl?

More options for your flight to Dulles Intl

Complete your trip to Dulles Intl with a hotel stay or car rental

Information on your arrival and departure airports

Cabin class types available on flights to Dulles Intl

Find direct flights for Dulles Intl

Flights from domestic origins to Illinois

Choose which airport to fly into in Washington, D.C.

Flights to other popular destinations

Find deals for your return flight