$61+ Cheap flights from Washington, D.C. (WAS) to Illinois
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 2/1. Fares are subject to change and may not be available on all flights or dates of travel.
WAS — ORD
Feb 7 — Feb 141
1 adult, Economy
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Find cheap flights from Washington, D.C. to Illinois with Cheapflights
1. Tell us where you want to go
Enter your travel information like dates, passengers, trip type (one-way or round trip), and preferred cabin class then click “Find deals”2. Select your favorite providers
We find the providers serving your travel needs. Choose up to four travel providers to compare side-by-side for flights, hotels, or car rentals.3. Compare prices and book
Review each provider’s pricing and select the best option for you! Book through your favorite provider’s website for a seamless experience.Cheap flight deals from Washington, D.C. to Illinois
Keep the following information in mind while searching for Washington, D.C. to Illinois flight deals. Data was last updated January 8, 2026.
Most accurate provider | Mytrip 3 stars |
|---|---|
Most trusted provider | Mytrip 3 stars |
Round-trip from | $70 (Frontier) |
One-way from | $61 (Frontier) |
Popular in | December |
Cheapest in | September |
Average price | $229 |
Good round-trip deal | $167 or less |
Good one-way deal | $138 or less |
Find flight deals from Washington, D.C. to Illinois
Cheapest flights from Washington, D.C. to IllinoisExplore the most affordable flight options available from Washington, D.C. to Illinois. Find the lowest fares from popular airlines and budget airlines, with prices last updated on January 8, 2026.
Explore the most affordable flight options available from Washington, D.C. to Illinois. Find the lowest fares from popular airlines and budget airlines, with prices last updated on January 8, 2026.
This Frontier deal was found by Cheapflights users on 1/7. 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.
Thu 1/2212:05 pmBWI - ORD
Nonstop2h 27mFrontier
Mon 1/268:45 amORD - BWI
Nonstop2h 00mFrontier
Deal found 1/7![Frontier logo]()
$70
This Frontier deal was found by Cheapflights users on 1/7. 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.
Mon 3/94:28 pmBWI - ORD
Nonstop2h 27mFrontier
Mon 3/1612:43 pmORD - BWI
Nonstop2h 00mFrontier
Deal found 1/7![Frontier logo]()
$71
This Super.com deal was found by Cheapflights users on 1/6. 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 Super.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 1/2912:05 pmBWI - ORD
Nonstop2h 27mFrontier
Sun 2/15:25 amORD - BWI
Nonstop2h 00mFrontier
Deal found 1/6![Frontier logo]()
$72
This Frontier deal was found by Cheapflights users on 1/7. 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.
Mon 1/2612:40 pmBWI - ORD
Nonstop2h 27mFrontier
Sun 2/15:25 amORD - BWI
Nonstop2h 00mFrontier
Deal found 1/7![Frontier logo]()
$74
This Kiwi.com deal was found by Cheapflights users on 1/6. 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 Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 1/187:45 pmBWI - ORD
Nonstop2h 27mFrontier
Thu 1/228:10 amORD - BWI
Nonstop2h 00mFrontier
Deal found 1/6![Frontier logo]()
$82
This Frontier deal was found by Cheapflights users on 1/8. 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.
Mon 4/69:57 amBWI - ORD
Nonstop2h 24mFrontier
Mon 4/136:00 amORD - BWI
Nonstop2h 02mFrontier
Deal found 1/8![Frontier logo]()
$84
This Priceline deal was found by Cheapflights users on 1/7. 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 Priceline is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 2/912:40 pmBWI - ORD
Nonstop2h 27mMultiple Airlines
Tue 2/1012:44 pmORD - BWI
1 stop9h 09mMultiple Airlines
Deal found 1/7![Multiple Airlines logo]()
$87
This CheapOair deal was found by Cheapflights users on 1/7. 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 CheapOair is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 1/2912:05 pmBWI - ORD
Nonstop2h 27mFrontier
Mon 2/28:45 amORD - BWI
Nonstop2h 00mFrontier
Deal found 1/7![Frontier logo]()
$91
This Frontier deal was found by Cheapflights users on 1/7. 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.
Thu 1/2912:05 pmBWI - ORD
Nonstop2h 27mFrontier
Tue 2/32:53 pmORD - BWI
1 stop8h 28mFrontier
Deal found 1/7![Frontier logo]()
$93
This Frontier deal was found by Cheapflights users on 1/7. 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.
Mon 1/2612:40 pmBWI - ORD
Nonstop2h 27mFrontier
Tue 2/32:53 pmORD - BWI
1 stop8h 28mFrontier
Deal found 1/7![Frontier logo]()
$94
This CheapOair deal was found by Cheapflights users on 1/8. 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 CheapOair is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 1/2310:00 amBWI - ORD
Nonstop2h 27mFrontier
Mon 1/268:45 amORD - BWI
Nonstop2h 00mFrontier
Deal found 1/8![Frontier logo]()
$95
This Frontier deal was found by Cheapflights users on 1/7. 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 2/47:10 amBWI - MDW
1 stop5h 55mFrontier
Wed 2/116:15 amMDW - BWI
1 stop10h 32mFrontier
Deal found 1/7![Frontier logo]()
$128
Cheapflights Fare Finder
Customize your flight search to find flights from Washington, D.C. to Illinois 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 8, 2026.
Use the filters below to find and compare flights from Washington, D.C. to Illinois that are best for you.
Fly from
Washington, D.C.
Fly to
Illinois
Route
Depart
Return
Price
BaltimoreChicago
BWI - MDW
BWIMDW
Baltimore/Washington
Thu 2/5
10:55 am-12:05 pm
Nonstop2h 10m
Chicago Midway
Mon 2/9
10:45 am-1:35 pm
Nonstop1h 50m
$129
BaltimoreChicago
BWI - ORD
BWIORD
Baltimore/Washington
Thu 2/19
6:30 am-7:53 am
Nonstop2h 23m
Chicago O'Hare Intl
Mon 2/23
6:15 pm-9:17 pm
Nonstop2h 02m
$129
BaltimoreChicago
BWI - MDW
BWIMDW
Baltimore/Washington
Sat 2/14
8:35 pm-9:50 pm
Nonstop2h 15m
Chicago Midway
Mon 2/16
6:40 am-9:35 am
Nonstop1h 55m
$134
BaltimoreChicago
BWI - MDW
BWIMDW
Baltimore/Washington
Thu 1/29
4:20 pm-6:35 pm
1 stop3h 15m
Chicago Midway
Mon 2/2
5:15 pm-8:10 pm
Nonstop1h 55m
$135
BaltimoreChicago
BWI - MDW
BWIMDW
Baltimore/Washington
Tue 2/3
10:25 am-11:35 am
Nonstop2h 10m
Chicago Midway
Thu 2/5
1:35 pm-5:40 pm
1 stop3h 05m
$135
BaltimoreChicago
BWI - MDW
BWIMDW
Baltimore/Washington
Mon 3/16
5:50 pm-8:10 pm
1 stop3h 20m
Chicago Midway
Thu 3/19
9:40 pm-12:25 am
Nonstop1h 45m
$135
BaltimoreChicago
BWI - ORD
BWIORD
Baltimore/Washington
Thu 1/29
10:05 am-11:25 am
Nonstop2h 20m
Chicago O'Hare Intl
Sat 1/31
6:15 pm-9:21 pm
Nonstop2h 06m
$144
BaltimoreChicago
BWI - MDW
BWIMDW
Baltimore/Washington
Thu 1/29
10:25 am-11:35 am
Nonstop2h 10m
Chicago Midway
Sat 1/31
5:40 pm-8:30 pm
Nonstop1h 50m
$144
Washington, D.C.Chicago
DCA - MDW
DCAMDW
Washington, D.C. Reagan-National
Wed 2/4
6:55 pm-8:05 pm
Nonstop2h 10m
Chicago Midway
Wed 2/11
10:15 am-6:00 pm
2 stops6h 45m
$145
Washington, D.C.Chicago
DCA - ORD
DCAORD
Washington, D.C. Reagan-National
Thu 2/26
6:00 am-12:15 pm
1 stop7h 15m
Chicago O'Hare Intl
Mon 3/2
2:15 pm-11:50 pm
1 stop8h 35m
$149
Showing 1-10 of 60 results
Best time to book a flight from Washington, D.C. to Illinois
Have a flexible travel schedule? Discover the best time to fly to Illinois from Washington, D.C. 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.
Cheapflights Insights
Everything you need to know about your flight from Washington, D.C. to Illinois
What is the cheapest month to book a flight from Washington, D.C. to Illinois?
Currently, March is the cheapest month in which you can book a flight from Washington, D.C. to Illinois (average of $48). Flying from Washington, D.C. to Illinois in June is currently the most expensive (average of $133). 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 WAS to IL?
Find hourly flight availability from Washington, D.C. to Illinois. Discover flight options and departure times throughout the day, allowing you to choose a departure time that suits your schedule. Data last updated January 8, 2026.
One of the essential ways to save on airfare from Washington, D.C. to Illinois is to remain as flexible as possible. Flights that are at noon tend to be the most expensive. A flight in the evening could potentially save you up to 31% on airfare.
What is the cheapest day to fly from Washington, D.C. to Illinois?
Use this chart to determine the cheapest time to fly round-trip from Washington, D.C. to Illinois. Price data was last updated on January 3, 2026.
Travelers seeking maximum savings on their Washington, D.C. to Illinois flight should consider departing on Friday at noon when fares are most often at their lowest. Monday mornings flights should be avoided if possible as fares are typically the most expensive at this time.
Weekly flight availability from Washington, D.C. to Illinois
Explore weekly flight availability from Washington, D.C. to Illinois. 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 8, 2026.
The most flights from WAS to USIL are scheduled on a Wednesday (69 on average). You will have fewer flight options on Saturday, which is when the least amount of flights are scheduled (34 on average).
Reviews of airlines servicing Illinois
Get insights into the airlines that provide service to Illinois. 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 Illinois. Reviews last updated January 8, 2026.
Peruse reviews from past customers who have flown with Southwest, United Airlines, and American Airlines from Washington, D.C. to Illinois to help guide your decision. Users have also rated airlines in terms of entertainment options, comfort, food, crew/service, and boarding process.
Crew
8.6
Comfort
8.0
Food
7.0
Overall
8.0
Boarding
8.1
Entertainment
7.5
Reviews
1 / 20
2.0
MediocreThomas,Dec 2025
SEA - DEN
Crew
8.6
Comfort
8.0
Food
7.0
Overall
8.0
Boarding
8.1
Entertainment
7.5
Reviews
1 / 20
2.0
MediocreThomas,Dec 2025
SEA - DEN
Crew
8.6
Comfort
8.0
Food
7.0
Overall
8.0
Boarding
8.1
Entertainment
7.5
Reviews
1 / 20
2.0
MediocreThomas,Dec 2025
SEA - DEN
Crew
8.6
Comfort
8.0
Food
7.0
Overall
8.0
Boarding
8.1
Entertainment
7.5
Reviews
1 / 20
2.0
MediocreThomas,Dec 2025
SEA - DEN
Crew
8.6
Comfort
8.0
Food
7.0
Overall
8.0
Boarding
8.1
Entertainment
7.5
Reviews
1 / 20
2.0
MediocreThomas,Dec 2025
SEA - DEN
Crew
8.6
Comfort
8.0
Food
7.0
Overall
8.0
Boarding
8.1
Entertainment
7.5
Reviews
1 / 20
2.0
MediocreThomas,Dec 2025
SEA - DEN
Related info for your journey
Find useful and relevant information for your journey from Washington, D.C. to Illinois. Access travel guides, tips, and recommendations to enhance your travel experience. Get information about local attractions, weather, transportation options, and more.
Browse thousands of different options on Cheapflights for your next trip
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Alternative routes for Washington, D.C. to Illinois
See prices for flight routes from nearby airports that may be better suited for you.
Top 6 airlines flying from Washington, D.C. to Illinois
Discover the top 6 airlines that operate flights from Washington, D.C. to Illinois. 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 8, 2026.
| Airline | Cheapest | Average | Flexibility | On-time |
|---|---|---|---|---|
| Cheapest$52 | Average$121 | FlexibilityNo cancel fee | On-time65% | |
| Cheapest$58 | Average$183 | FlexibilityNo cancel fee | On-time62% | |
| Cheapest$131 | Average$355 | FlexibilityNo cancel fee | On-time69% | |
| Cheapest$148 | Average$294 | FlexibilityNo cancel fee | On-time63% | |
| Cheapest$154 | Average$404 | FlexibilityNo cancel fee | On-time71% | |
| Cheapest$234 | Average$404 | FlexibilityNo cancel fee | On-timeN/A |