How does KAYAK find such low prices on flights from Illinois to Washington, D.C.?

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, D.C.. Visit our flight page for the latest deals!>/a>

How does KAYAK's flight Price Forecast tool help me choose the right time to buy my flight ticket from Illinois to Washington, D.C.?

KAYAK’s flight Price Forecast tool uses historical data to determine whether the price for a flight to Washington, D.C. from Illinois is likely to change within 7 days, so travelers know whether to wait or book now. Visit our flight page for the latest deals!>/a>

What is the Hacker Fare option on flights from Illinois to Washington, D.C.?

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, D.C. with an airline and back to Illinois with another airline. Visit our flight page for the latest deals!>/a>

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

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, D.C. from Illinois up to 3 days before/after your preferred dates. You can then pick the flights that suit you best. Visit our flight page for the latest deals!>/a>

$63 CHEAP FLIGHTS from Illinois to Washington, D.C.

KAYAK searches hundreds of travel sites at once for deals on flights to Washington, D.C.

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Flight Deals

Cheap Flights from Illinois to Washington, D.C.

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 Washington, D.C.

Tue, May 26 - Tue, Jun 2

6:33 pm - 7:43 am

STL

BWI

12h 10m

1 stop

8:52 am - 5:33 pm

BWI

STL

9h 41m

1 stop

$124Frontier

Tue, May 26 - Tue, Jun 2

6:33 pm - 7:43 am

STL

BWI

12h 10m

1 stop

8:52 am - 5:33 pm

BWI

STL

9h 41m

1 stop

$126Frontier

Tue, Jun 9 - Tue, Jun 16

7:35 pm - 10:25 pm

MDW

BWI

1h 50mnonstop

8:30 pm - 9:35 pm

BWI

MDW

2h 05mnonstop

$177Southwest

Tue, May 26 - Wed, May 27

2:25 pm - 5:33 pm

ORD

BWI

2h 08mnonstop

7:05 pm - 8:29 pm

BWI

ORD

2h 24mnonstop

$177United Airlines

Fri, May 15 - Mon, May 18

5:05 am - 5:07 pm

ORD

BWI

11h 02m

1 stop

11:32 am - 12:54 pm

BWI

ORD

2h 22mnonstop

$182Multiple Airlines

Wed, May 27 - Wed, Jun 3

12:50 pm - 5:25 pm

MDW

BWI

3h 35m

1 stop

6:30 am - 7:35 am

BWI

MDW

2h 05mnonstop

$183Southwest

Wed, May 13 - Wed, May 20

12:04 pm - 8:35 am

MDW

BWI

19h 31m

2 stops

8:52 am - 10:02 pm

BWI

MDW

14h 10m

1 stop

$184Multiple Airlines

Tue, May 19 - Sat, Jun 20

9:01 pm - 11:57 pm

ORD

DCA

1h 56mnonstop

5:00 am - 9:02 am

DCA

ORD

5h 02m

1 stop

$217American Airlines

Tue, May 19 - Sat, May 23

7:51 am - 10:59 am

ORD

DCA

2h 08mnonstop

5:00 am - 9:02 am

DCA

ORD

5h 02m

1 stop

$218American Airlines

Tue, May 19 - Wed, Jun 3

7:45 am - 2:14 pm

STL

DCA

5h 29m

1 stop

11:57 am - 3:46 pm

DCA

STL

4h 49m

1 stop

$257United Airlines

Useful Info

Low season	February
High season	May
Cheapest flight	$63

Best time to beat the crowds with an average 8% drop in price.

Most popular time to fly with an average 6% increase in price.

Flight from St. Louis to Washington Dulles Airport

How does KAYAK find such low prices on flights from Illinois to Washington, D.C.?
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, D.C..
How does KAYAK's flight Price Forecast tool help me choose the right time to buy my flight ticket from Illinois to Washington, D.C.?
KAYAK’s flight Price Forecast tool uses historical data to determine whether the price for a flight to Washington, D.C. 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, D.C.?
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, D.C. 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, D.C.?
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, D.C. from Illinois up to 3 days before/after your preferred dates. You can then pick the flights that suit you best.

Linthicum Heights

Hanover

Springfield

Gaithersburg

Towson

Oxon Hill

Owings Mills

Greenbelt

Glen Burnie

Edgewood

Ellicott City

Colonial Beach

Pikesville

Camp Springs

Hunt Valley

Lutherville Timonium

Westminster

Chesapeake Beach

Stevensville

Hyattsville

Everything you need to know for your flight to Washington, D.C.

Cabin class

Complete your trip

Direct Flights

Flights to other cities

Origins

Other airports

Return flight deals

Cabin class types available on flights to Illinois

First Class flights to Washington, D.C.from $489

Business Class flights to Washington, D.C.from $462

Premium Economy Class flights to Washington, D.C.from $529

Economy Class flights to Washington, D.C.from $135

$63 Find Cheap Flights from Illinois to Washington, D.C.

KAYAK searches hundreds of travel sites at once for deals on flights to Washington, D.C.

Cheap Flights from Illinois to Washington, D.C.

Recent round-trip flight deals from Illinois to Washington, D.C.

Recent one-way flight deals from Illinois to Washington, D.C.

Recent last minute flight deals from Illinois to Washington, D.C.

Recent direct flight deals from Illinois to Washington, D.C.

Good to know

FAQs for booking flights from Illinois to Washington, D.C.

How does KAYAK find such low prices on flights from Illinois to Washington, D.C.?

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, D.C..

How does KAYAK's flight Price Forecast tool help me choose the right time to buy my flight ticket from Illinois to Washington, D.C.?

KAYAK’s flight Price Forecast tool uses historical data to determine whether the price for a flight to Washington, D.C. 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, D.C.?

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, D.C. 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, D.C.?

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, D.C. from Illinois up to 3 days before/after your preferred dates. You can then pick the flights that suit you best.

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

Everything you need to know for your flight to Washington, D.C.

Cabin class types available on flights to Illinois

Complete your trip to Washington, D.C. with a hotel stay or car rental

Find direct flights for Washington, D.C.

Flights to other popular destinations

Flights from domestic origins to Washington, D.C.

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

Find deals for your return flight