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.

$57 CHEAP FLIGHTS from Illinois 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.

Thu, Dec 3 - Mon, Dec 14

10:53 am - 2:00 pmORD Chicago O'Hare Intl-BWI Baltimore/Washington

2h 07mnonstop

5:50 pm - 7:14 pmBWI Baltimore/Washington-ORD Chicago O'Hare Intl

2h 24mnonstop

$112Frontier

Fri, Oct 23 - Sun, Nov 1

6:00 am - 9:03 amORD Chicago O'Hare Intl-BWI Baltimore/Washington

2h 03mnonstop

9:53 am - 11:23 amBWI Baltimore/Washington-ORD Chicago O'Hare Intl

2h 30mnonstop

$114Frontier

Sat, Oct 3 - Tue, Oct 6

7:30 am - 10:30 amORD Chicago O'Hare Intl-BWI Baltimore/Washington

2h 00mnonstop

6:29 am - 7:50 amBWI Baltimore/Washington-ORD Chicago O'Hare Intl

2h 21mnonstop

$182United Airlines

Sat, Oct 3 - Tue, Oct 6

6:00 am - 11:59 amORD Chicago O'Hare Intl-DCA Washington, D.C. Reagan-National

4h 59m1 stop Newark

6:30 am - 7:44 amDCA Washington, D.C. Reagan-National-ORD Chicago O'Hare Intl

2h 14mnonstop

$188United Airlines

Wed, Dec 9 - Mon, Dec 14

7:18 pm - 12:42 amSTL Lambert-St Louis-IAD Washington, D.C. Dulles Intl

4h 24m1 stop Atlanta Hartsfield-Jackson

10:11 am - 1:28 pmIAD Washington, D.C. Dulles Intl-STL Lambert-St Louis

4h 17m1 stop Atlanta Hartsfield-Jackson

$237Delta

Sat, Dec 12 - Thu, Dec 17

2:33 pm - 8:12 pmSTL Lambert-St Louis-IAD Washington, D.C. Dulles Intl

4h 39m1 stop Atlanta Hartsfield-Jackson

10:11 am - 1:28 pmIAD Washington, D.C. Dulles Intl-STL Lambert-St Louis

4h 17m1 stop Atlanta Hartsfield-Jackson

$237Delta

Thu, Oct 8 - Thu, Oct 15

4:20 pm - 10:55 pmSTL Lambert-St Louis-DCA Washington, D.C. Reagan-National

5h 35m1 stop Atlanta Hartsfield-Jackson

7:55 am - 12:15 pmDCA Washington, D.C. Reagan-National-STL Lambert-St Louis

5h 20m1 stop Chicago Midway

$237Southwest

Thu, Oct 1 - Mon, Oct 5

5:00 am - 12:25 pmSTL Lambert-St Louis-DCA Washington, D.C. Reagan-National

6h 25m1 stop Tampa

1:05 pm - 7:05 pmDCA Washington, D.C. Reagan-National-STL Lambert-St Louis

7h 00m1 stop Houston Hobby

$237Southwest

Tue, Oct 6 - Fri, Oct 9

5:08 pm - 8:18 pmSTL Lambert-St Louis-DCA Washington, D.C. Reagan-National

2h 10mnonstop

6:55 pm - 8:32 pmDCA Washington, D.C. Reagan-National-STL Lambert-St Louis

2h 37mnonstop

$246American Airlines

Fri, Oct 2 - Mon, Oct 5

6:00 am - 9:19 amSTL Lambert-St Louis-DCA Washington, D.C. Reagan-National

2h 19mnonstop

2:25 pm - 3:57 pmDCA Washington, D.C. Reagan-National-STL Lambert-St Louis

2h 32mnonstop

$246American Airlines

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

Thu, Sep 10 - Sat, Sep 12

6:20 am - 9:25 amORD Chicago O'Hare Intl-BWI Baltimore/Washington

2h 05mnonstop

8:45 pm - 10:02 pmBWI Baltimore/Washington-ORD Chicago O'Hare Intl

2h 17mnonstop

$167Frontier

Sat, Sep 12 - Tue, Sep 22

4:30 pm - 7:46 pmORD Chicago O'Hare Intl-BWI Baltimore/Washington

2h 16mnonstop

6:38 am - 11:51 amBWI Baltimore/Washington-ORD Chicago O'Hare Intl

6h 13m1 stop Atlanta Hartsfield-Jackson

$239Frontier

Tue, Sep 15 - Wed, Sep 16

7:30 am - 10:30 amORD Chicago O'Hare Intl-BWI Baltimore/Washington

2h 00mnonstop

6:05 am - 7:26 amBWI Baltimore/Washington-ORD Chicago O'Hare Intl

2h 21mnonstop

$258United Airlines

Tue, Sep 15 - Thu, Sep 17

10:49 am - 1:58 pmORD Chicago O'Hare Intl-BWI Baltimore/Washington

2h 09mnonstop

12:10 pm - 1:31 pmBWI Baltimore/Washington-ORD Chicago O'Hare Intl

2h 21mnonstop

$312United Airlines

Sat, Sep 12 - Sat, Oct 3

6:00 am - 12:49 pmPIA Greater Peoria-BWI Baltimore/Washington

5h 49m1 stop Chicago O'Hare Intl

11:23 am - 4:58 pmBWI Baltimore/Washington-PIA Greater Peoria

6h 35m1 stop Chicago O'Hare Intl

$338American Airlines

Sat, Sep 12 - Mon, Sep 14

6:58 am - 10:07 amORD Chicago O'Hare Intl-BWI Baltimore/Washington

2h 09mnonstop

11:23 am - 12:40 pmBWI Baltimore/Washington-ORD Chicago O'Hare Intl

2h 17mnonstop

$368American Airlines

Wed, Sep 16 - Fri, Sep 18

6:00 am - 3:34 pmORD Chicago O'Hare Intl-IAD Washington, D.C. Dulles Intl

8h 34m1 stop Dallas/Fort Worth

6:46 pm - 10:59 pmIAD Washington, D.C. Dulles Intl-ORD Chicago O'Hare Intl

29h 13m2 stops Blountville Tri Cities TN/VA Orlando

$376Multiple Airlines

Wed, Sep 16 - Fri, Oct 23

6:00 am - 3:34 pmORD Chicago O'Hare Intl-IAD Washington, D.C. Dulles Intl

8h 34m1 stop Dallas/Fort Worth

6:36 pm - 7:51 amIAD Washington, D.C. Dulles Intl-ORD Chicago O'Hare Intl

14h 15m2 stops Blountville Tri Cities TN/VA Orlando

$377Multiple Airlines

Mon, Sep 14 - Mon, Sep 28

9:00 am - 11:55 amMDW Chicago Midway-BWI Baltimore/Washington

1h 55mnonstop

6:30 am - 7:30 amBWI Baltimore/Washington-MDW Chicago Midway

2h 00mnonstop

$390Southwest

Mon, Sep 14 - Mon, Sep 28

2:35 pm - 7:45 pmMDW Chicago Midway-BWI Baltimore/Washington

4h 10m1 stop Myrtle Beach Intl

6:30 am - 7:30 amBWI Baltimore/Washington-MDW Chicago Midway

2h 00mnonstop

$396Southwest

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

Thu, Dec 3 - Mon, Dec 14

10:53 am - 2:00 pmORD Chicago O'Hare Intl-BWI Baltimore/Washington

2h 07mnonstop

5:50 pm - 7:14 pmBWI Baltimore/Washington-ORD Chicago O'Hare Intl

2h 24mnonstop

$112Frontier

Fri, Oct 23 - Sun, Nov 1

6:00 am - 9:03 amORD Chicago O'Hare Intl-BWI Baltimore/Washington

2h 03mnonstop

9:53 am - 11:23 amBWI Baltimore/Washington-ORD Chicago O'Hare Intl

2h 30mnonstop

$114Frontier

Thu, Dec 3 - Thu, Dec 17

10:53 am - 2:00 pmORD Chicago O'Hare Intl-BWI Baltimore/Washington

2h 07mnonstop

6:12 pm - 7:36 pmBWI Baltimore/Washington-ORD Chicago O'Hare Intl

2h 24mnonstop

$116Frontier

Sat, Oct 3 - Tue, Oct 6

7:30 am - 10:30 amORD Chicago O'Hare Intl-BWI Baltimore/Washington

2h 00mnonstop

6:29 am - 7:50 amBWI Baltimore/Washington-ORD Chicago O'Hare Intl

2h 21mnonstop

$182United Airlines

Sat, Oct 3 - Tue, Oct 6

7:45 pm - 10:59 pmORD Chicago O'Hare Intl-BWI Baltimore/Washington

2h 14mnonstop

9:09 am - 10:29 amBWI Baltimore/Washington-ORD Chicago O'Hare Intl

2h 20mnonstop

$196United Airlines

Tue, Oct 6 - Fri, Oct 9

5:08 pm - 8:18 pmSTL Lambert-St Louis-DCA Washington, D.C. Reagan-National

2h 10mnonstop

6:55 pm - 8:32 pmDCA Washington, D.C. Reagan-National-STL Lambert-St Louis

2h 37mnonstop

$246American Airlines

Fri, Oct 2 - Mon, Oct 5

6:00 am - 9:19 amSTL Lambert-St Louis-DCA Washington, D.C. Reagan-National

2h 19mnonstop

2:25 pm - 3:57 pmDCA Washington, D.C. Reagan-National-STL Lambert-St Louis

2h 32mnonstop

$246American Airlines

Fri, Oct 2 - Tue, Oct 6

3:55 pm - 6:55 pmSTL Lambert-St Louis-DCA Washington, D.C. Reagan-National

2h 00mnonstop

8:00 am - 9:25 amDCA Washington, D.C. Reagan-National-STL Lambert-St Louis

2h 25mnonstop

$246Southwest

Fri, Oct 2 - Mon, Oct 5

7:50 pm - 10:50 pmSTL Lambert-St Louis-DCA Washington, D.C. Reagan-National

2h 00mnonstop

6:50 pm - 8:15 pmDCA Washington, D.C. Reagan-National-STL Lambert-St Louis

2h 25mnonstop

$246Southwest

Thu, Oct 15 - Sun, Oct 18

4:50 pm - 7:59 pmORD Chicago O'Hare Intl-DCA Washington, D.C. Reagan-National

2h 09mnonstop

4:59 pm - 6:25 pmDCA Washington, D.C. Reagan-National-ORD Chicago O'Hare Intl

2h 26mnonstop

$8,649Alaska Airlines

Useful Info

Low season	February
High season	October
Cheapest flight	$57

Best time to beat the crowds with an average 20% drop in price.

Most popular time to fly and prices are also 1% lower on average.

Flight from St. Louis to Baltimore

IndivarFlew with American Airlines-Aug 2026

For a work trips, consider booking an Airline with multiple daily flights in case you might want standby for an earlier return flight.

UzomaFlew with American Airlines-Jan 2024

ORD and DCA are nice airports with plenty of space. ORD is always busy so allow ample time to drive there, drop your bag, and go through security if you don't have TSA pre check.

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

Chesapeake Beach

Camp Springs

Ellicott City

Pikesville

Hunt Valley

Colonial Beach

Lutherville Timonium

Capitol Heights

Westminster

Stevensville

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$57 Find Cheap Flights from Illinois to Washington, D.C. - Compare and Save

Cheap Flights from Illinois to Washington, D.C.

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

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

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Flights from Illinois to Washington, D.C.: the best tips from KAYAK users

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

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

More options for your flight to Washington, D.C.

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

Cabin class types available on flights to Illinois

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

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