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Dulles Intl

$90+ Cheap flights from Illinois to Dulles Intl (IAD)

This is the cheapest one-way flight price found by a Cheapflights user in the last 72 hours by searching for a flight departing on 2/15. Fares are subject to change and may not be available on all flights or dates of travel.
ORD — IAD
Jan 22 — Jan 291
Wed 1/22
Wed 1/29
1 adult, Economy
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Cheap flight deals from Illinois to Dulles Intl

Discover tips and strategies to find the most affordable flight options for your journey from Illinois (USIL) to Dulles Intl (IAD). Learn about various techniques such as flexible date searches, comparing prices across and setting up price alerts. Use these methods to find the cheapest flights available for your travel needs. Data last updated January 17, 2025.

Round-trip from

$179
(United Airlines)

One-way from

$90
(United Airlines)
From Illinois to Washington, D.C. Dulles Intl
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One-way flight from Illinois to Washington, D.C. Dulles Intl
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Cheapest flights from Illinois to Dulles Intl
Explore the most affordable flight options available from Illinois to Dulles Intl. Find the lowest fares from popular airlines and budget airlines, with prices last updated on January 17, 2025.

This United Airlines deal was found by Cheapflights users on 1/15. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 2/121:15 pmORD - IAD
Nonstop1h 58mUnited Airlines
Sat 2/1512:38 pmIAD - ORD
Nonstop2h 18mUnited Airlines
Deal found 1/15$179
This Frontier deal was found by Cheapflights users on 1/15. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Frontier is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 2/128:12 amMDW - IAD
1 stop5h 27mFrontier
Sat 2/153:04 pmIAD - MDW
1 stop8h 47mFrontier
Deal found 1/15$180
This Frontier deal was found by Cheapflights users on 1/15. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Frontier is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 2/128:33 amORD - IAD
1 stop5h 06mFrontier
Sat 2/159:44 amIAD - ORD
1 stop7h 47mFrontier
Deal found 1/15$180
This KAYAK deal was found by Cheapflights users on 1/15. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure KAYAK is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 2/126:45 amORD - IAD
1 stop4h 03mDelta
Thu 2/1312:05 pmIAD - ORD
1 stop6h 42mDelta
Deal found 1/15$216
This Delta deal was found by Cheapflights users on 1/16. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 2/159:33 amMDW - IAD
1 stop5h 17mDelta
Tue 2/1810:03 amIAD - MDW
1 stop7h 17mDelta
Deal found 1/16$217
This United Airlines deal was found by Cheapflights users on 1/16. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 2/83:36 pmPIA - IAD
1 stop4h 25mUnited Airlines
Sun 2/165:25 pmIAD - PIA
1 stop5h 21mUnited Airlines
Deal found 1/16$224
This American Airlines deal was found by Cheapflights users on 1/15. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 1/313:28 pmMLI - IAD
1 stop6h 13mAmerican Airlines
Tue 2/49:11 amIAD - MLI
1 stop7h 52mAmerican Airlines
Deal found 1/15$229
This United Airlines deal was found by Cheapflights users on 1/16. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 2/82:55 pmSTL - IAD
1 stop5h 06mUnited Airlines
Sun 2/96:05 amIAD - STL
1 stop5h 42mUnited Airlines
Deal found 1/16$229
This Delta deal was found by Cheapflights users on 1/16. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 2/184:40 pmSTL - IAD
1 stop6h 40mDelta
Sun 2/236:00 amIAD - STL
1 stop4h 20mDelta
Deal found 1/16$233
This FlightHub deal was found by Cheapflights users on 1/16. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure FlightHub is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 3/105:24 pmSTL - IAD
1 stop22h 30mFrontier
Fri 3/144:10 pmIAD - STL
1 stop8h 39mFrontier
Deal found 1/16$240
This Delta deal was found by Cheapflights users on 1/16. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 2/145:05 pmMLI - IAD
1 stop6h 15mDelta
Fri 2/214:53 pmIAD - MLI
1 stop6h 33mDelta
Deal found 1/16$249
This Justfly.com deal was found by Cheapflights users on 1/16. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Justfly.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 4/207:05 pmORD - IAD
1 stop14h 38mMultiple Airlines
Mon 4/285:25 pmIAD - ORD
1 stop7h 14mMultiple Airlines
Deal found 1/16$253

Find flights from Illinois to Dulles Intl within your budget

Customize your flight search to find flights from Illinois to Dulles Intl 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, Cheapflights users made 2,558,603 searches. Data last updated January 17, 2025.

Fly from

Any airport

Fly to

Any airport

Route

Depart

Return

Price

ChicagoWashington, D.C.

ORD - IAD

ORDIAD

Chicago O'Hare Intl

Wed 2/12

1:15 pm-4:13 pm

Nonstop1h 58m

Washington, D.C. Dulles Intl

Sat 2/15

12:38 pm-1:56 pm

Nonstop2h 18m

$179

ChicagoWashington, D.C.

MDW - IAD

MDWIAD

Chicago Midway

Wed 2/12

8:12 am-2:39 pm

1 stop5h 27m

Washington, D.C. Dulles Intl

Sat 2/15

3:04 pm-10:51 pm

1 stop8h 47m

$180

ChicagoWashington, D.C.

ORD - IAD

ORDIAD

Chicago O'Hare Intl

Wed 2/12

8:33 am-2:39 pm

1 stop5h 06m

Washington, D.C. Dulles Intl

Sat 2/15

9:44 am-4:31 pm

1 stop7h 47m

$180

ChicagoWashington, D.C.

ORD - IAD

ORDIAD

Chicago O'Hare Intl

Wed 2/12

6:45 am-11:48 am

1 stop4h 03m

Washington, D.C. Dulles Intl

Thu 2/13

12:05 pm-5:47 pm

1 stop6h 42m

$216

ChicagoWashington, D.C.

MDW - IAD

MDWIAD

Chicago Midway

Sat 2/15

9:33 am-3:50 pm

1 stop5h 17m

Washington, D.C. Dulles Intl

Tue 2/18

10:03 am-4:20 pm

1 stop7h 17m

$217

PeoriaWashington, D.C.

PIA - IAD

PIAIAD

Greater Peoria

Sat 2/8

3:36 pm-9:01 pm

1 stop4h 25m

Washington, D.C. Dulles Intl

Sun 2/16

5:25 pm-9:46 pm

1 stop5h 21m

$224

MolineWashington, D.C.

MLI - IAD

MLIIAD

Moline Quad-City

Fri 1/31

3:28 pm-10:41 pm

1 stop6h 13m

Washington, D.C. Dulles Intl

Tue 2/4

9:11 am-4:03 pm

1 stop7h 52m

$229

St. LouisWashington, D.C.

STL - IAD

STLIAD

Lambert-St Louis

Sat 2/8

2:55 pm-9:01 pm

1 stop5h 06m

Washington, D.C. Dulles Intl

Sun 2/9

6:05 am-10:47 am

1 stop5h 42m

$229

St. LouisWashington, D.C.

STL - IAD

STLIAD

Lambert-St Louis

Tue 2/18

4:40 pm-12:20 am

1 stop6h 40m

Washington, D.C. Dulles Intl

Sun 2/23

6:00 am-9:20 am

1 stop4h 20m

$233

St. LouisWashington, D.C.

STL - IAD

STLIAD

Lambert-St Louis

Mon 3/10

5:24 pm-4:54 pm

1 stop22h 30m

Washington, D.C. Dulles Intl

Fri 3/14

4:10 pm-11:49 pm

1 stop8h 39m

$240

Flights are sorted by cheapest round-trip flights first.

Deals found on 1/15

Showing 1-10 of 46 results
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Best time to book a flight from Illinois to Dulles Intl

Have a flexible travel schedule? Discover the best time to fly to Dulles Intl from Illinois with our price prediction graph.
Estimated round-trip price
Rates are based on past data. Find the cheapest month and day to book your flight based on your travel requirements, then search for cheap deals.

Travel insights for flights from Illinois to Dulles Intl

Get recent, data-driven insights about flights from Illinois to Dulles Intl including ideal travel times, pricing trends, and more.

What is the cheapest month to book a flight from Illinois to Washington, D.C. Dulles Intl Airport?

Currently, August is the cheapest month in which you can book a flight from Illinois to Washington, D.C. Dulles Intl Airport (average of $309). Flying from Illinois to Washington, D.C. Dulles Intl Airport in June is currently the most expensive (average of $389). There are several factors that can impact the price of a flight, so comparing airlines, departure airports and flight times can provide users with more options.

What is the cheapest time of day to fly from IL to IAD?

Find hourly flight availability from Illinois to Dulles Intl. Discover flight options and departure times throughout the day, allowing you to choose a departure time that suits your schedule. Data last updated January 17, 2025.

Regardless of the time of day you decide to fly, the ticket price will remain around the same. Book flights from Illinois to Washington, D.C. Dulles Intl Airport as you normally would.

Weekly flight availability from Illinois to Washington, D.C. Dulles Intl Airport

Explore weekly flight availability from Illinois to Dulles Intl. Discover flights operating on different days of the week, giving you the flexibility to choose a travel day that best fits your plans. Compare info to find the most convenient option for your journey. Data last updated January 17, 2025.

The most flights from USIL to IAD are scheduled on a Thursday (20 on average). You will have fewer flight options on Friday, which is when the least amount of flights are scheduled (3 on average).

Rainfall in Dulles Intl by month

Plan your trip to Dulles Intl by taking into account the average rainfall totals by month.

In terms of precipitation, rainfall in Washington, D.C. Dulles Intl Airport ranges from 2.6 - 4.0 inches per month. May is typically the wettest month, when rainfall can reach 4.0 in. February is typically the driest time to visit Washington, D.C. Dulles Intl Airport when rainfall is around 2.6 in.

Temperature in Dulles Intl by month

Plan your trip to Dulles Intl by taking into account the average temperature totals by month.

If weather is an important factor for your trip to Washington, D.C. Dulles Intl Airport, use this chart to help with planning. For those seeking warmer temperatures, July is the ideal time of year to visit, when temperatures reach an average of 80.6 F. Travelers looking to avoid the cold should look outside of January, when temperatures are typically at their lowest (around 35.6 F).

Reviews of airlines servicing Dulles Intl

Get insights into the airlines that provide service to Dulles Intl. Read reviews, discover amenities, and learn about the overall travel experience offered by airlines. Use this information to make informed decisions when choosing an airline for your flight to Dulles Intl. Reviews last updated January 17, 2025.
See what other customers who have flown with United Airlines, Delta and American Airlines from Illinois to Washington, D.C. have to say. Users have also rated airlines in terms of entertainment options, comfort, food, crew/service, and boarding process.
Delta
8.0
Very good
8,511 reviews

Boarding

8.2

Food

7.3

Overall

8.0

Entertainment

7.9

Comfort

8.0

Crew

8.6

Reviews

1 / 10

Delta has consistently been the best U.S. airline for my travels and this flight was no exception

Delta
8.0
Very good
8,511 reviews
Delta
8.0
Very good
8,511 reviews

Boarding

8.2

Food

7.3

Overall

8.0

Entertainment

7.9

Comfort

8.0

Crew

8.6

Reviews

1 / 10

Delta has consistently been the best U.S. airline for my travels and this flight was no exception

United Airlines
7.4
Good
8,965 reviews
Delta
8.0
Very good
8,511 reviews

Boarding

8.2

Food

7.3

Overall

8.0

Entertainment

7.9

Comfort

8.0

Crew

8.6

Reviews

1 / 10

Delta has consistently been the best U.S. airline for my travels and this flight was no exception

Allegiant Air
7.4
Good
801 reviews
Delta
8.0
Very good
8,511 reviews

Boarding

8.2

Food

7.3

Overall

8.0

Entertainment

7.9

Comfort

8.0

Crew

8.6

Reviews

1 / 10

Delta has consistently been the best U.S. airline for my travels and this flight was no exception

American Airlines
7.2
Good
10,000 reviews
Delta
8.0
Very good
8,511 reviews

Boarding

8.2

Food

7.3

Overall

8.0

Entertainment

7.9

Comfort

8.0

Crew

8.6

Reviews

1 / 10

Delta has consistently been the best U.S. airline for my travels and this flight was no exception

Sun Country Air
7.0
Good
384 reviews
Delta
8.0
Very good
8,511 reviews

Boarding

8.2

Food

7.3

Overall

8.0

Entertainment

7.9

Comfort

8.0

Crew

8.6

Reviews

1 / 10

Delta has consistently been the best U.S. airline for my travels and this flight was no exception

Related info for your journey

Find useful and relevant information for your journey from Illinois to Dulles Intl. Access travel guides, tips, and recommendations to enhance your travel experience. Get information about local attractions, weather, transportation options, and more.

  • What are the cheapest airlines to fly from Illinois to Washington, D.C. Dulles Intl Airport one-way?

    To fly one-way, consider booking your trip with United Airlines, which is currently one of the cheapest options available, starting at $90. Frontier flights start at $95 while deals on Delta start at $109 one-way.

  • What are the most popular routes from Illinois to Washington, D.C. Dulles Intl Airport?

    The most popular flight routes from Illinois to Washington, D.C. Dulles Intl Airport are Chicago O'Hare Intl - Washington, D.C. Dulles Intl, Chicago Midway - Washington, D.C. Dulles Intl and Lambert-St Louis - Washington, D.C. Dulles Intl.

  • What are the most reliable airlines from Illinois to Washington, D.C. Dulles Intl Airport?

    The top 3 most reliable airlines when flying from Illinois to Washington, D.C. Dulles Intl Airport are Air China (94%), Air Canada (84%) and Copa Airlines (82%).

  • What are the cheapest flights from Illinois to Washington, D.C. Dulles Intl Airport?

    The cheapest flight price from Illinois to Washington, D.C. Dulles Intl Airport is $118. On average you can expect to pay $925. The most popular route, (Chicago O'Hare Intl - Washington, D.C. Dulles Intl), can usually be booked for $139.

  • Can I find deals for flights from Illinois to Dulles Intl that include hotel bookings?

    Yes. In addition to deals on Illinois to Dulles Intl flights, Cheapflights offers vacation packages that include both flights and hotel.

  • How can I find direct flights from Illinois to Dulles Intl?

    After entering your origin and destination, apply the non-stop filter on the search result page to find direct flights from Illinois to Dulles Intl.

  • Can I find deals for business class flights from Illinois to Dulles Intl?

    Yes. Cheapflights offers flight deals from Illinois to Dulles Intl by cabin class. In addition to browsing deals, you can also filter by cabin class on the search results page after making a search.

  • What is the cheapest month to book a flight from Illinois to Washington, D.C. Dulles Intl Airport?

    Currently, August is the cheapest month in which you can book a flight from Illinois to Washington, D.C. Dulles Intl Airport (average of $309). Flying from Illinois to Washington, D.C. Dulles Intl Airport in June is currently the most expensive (average of $389). There are several factors that can impact the price of a flight, so comparing airlines, departure airports and flight times can provide users with more options.

See more FAQs

Traveling to a place near Illinois?

Book flights to Illinois if you plan to visit one of these locations
Fairfax
Arlington
Alexandria
Springfield
Silver Spring
Rockville
Tysons
Gaithersburg
Fredericksburg
Linthicum Heights
Laurel
Falls Church
Greenbelt
Sterling
Easton
Oxon Hill
Herndon
Woodbridge
Bowie
Reston

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Alternative routes for Illinois to Dulles Intl

See prices for flight routes from nearby airports that may be better suited for you.
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Dallas/Fort Worth to Dulles Intl flights
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Atlanta to Dulles Intl flights
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Minneapolis to Baltimore flights
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George Bush Intcntl to Reagan-National flights
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Seattle to Baltimore flights
Orlando to Baltimore flights
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Tampa to Reagan-National flights
Detroit to Dulles Intl flights
Newark to Reagan-National flights
Tampa to Baltimore flights
Detroit to Reagan-National flights
Salt Lake City to Dulles Intl flights

Top 4 airlines flying from Illinois to Dulles Intl

Discover the top 4 airlines that operate flights from Illinois to Dulles Intl. Compare their services, reliability, and customer satisfaction ratings to choose the airline that best suits your travel preferences and needs. Over the last 7 days, Cheapflights users made 2,558,603 searches. Data last updated January 17, 2025.
AirlineCheapestAverageFlexibilityOn-time
FrontierCheapest$54Average$164FlexibilityNo cancel feeOn-time62%
American AirlinesCheapest$121Average$318FlexibilityNo cancel feeOn-time71%
DeltaCheapest$175Average$347FlexibilityNo cancel feeOn-timeN/A
United AirlinesCheapest$180Average$428FlexibilityNo cancel feeOn-time69%
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