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St. Charles

$68+ Cheap flights from Washington, D.C. (WAS) to St. Charles, MO

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 4/8. Fares are subject to change and may not be available on all flights or dates of travel.
WAS — STL
Mar 10 — Mar 171
Mon 3/10
Mon 3/17
1 adult, Economy
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The best prices from Washington, D.C. to St. Charles are usually found in August or May, booked 89 days in advance, depart on a Wednesday or Friday and return on a Friday

Cheap flight deals from Washington, D.C. to St. Charles

Keep the following information in mind while searching for Washington, D.C. to St. Charles flight deals. Data was last updated March 5, 2025.

Most accurate provider

FlightHub
3 stars

Most trusted provider

FlightHub
3 stars

Round-trip from

$150
(CheapOair)

One-way from

$68
(Cheapflightsfares)

Popular in

March

Cheapest in

August

Average price

$376
Provider with most accurate pricing for Washington, D.C. (WAS)-Lambert-St Louis flight deals.
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Provider most trusted by Cheapflights users for Washington, D.C. (WAS)-Lambert-St Louis flights.
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From Washington, D.C. (WAS) to St. Charles
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One-way flight from Washington, D.C. (WAS) to St. Charles
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Highest demand for flights based on searches. 6% potential increase in price ($22 potential increase over avg. RT price).
Search Deals
Cheapest flight prices on average. 1% potential price decrease ($4 potential savings vs. average RT price).
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Average for round-trip flights in March 2025
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Find flight deals from Washington, D.C. to St. Charles

Cheapest flights from Washington, D.C. to St. Charles
Explore the most affordable flight options available from Washington, D.C. to St. Charles. Find the lowest fares from popular airlines and budget airlines, with prices last updated on March 5, 2025.

This CheapOair deal was found by Cheapflights users on 3/4. 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.
Tue 4/810:35 amBWI - STL
1 stop14h 11mFrontier
Wed 4/94:57 pmSTL - BWI
1 stop21h 20mFrontier
Deal found 3/4$150
This CheapOair deal was found by Cheapflights users on 3/3. 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.
Wed 4/94:06 pmBWI - STL
1 stop8h 40mMultiple Airlines
Sun 4/136:10 pmSTL - BWI
1 stop5h 46mMultiple Airlines
Deal found 3/3$164
This CheapOair deal was found by Cheapflights users on 3/4. 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 4/36:50 amBWI - STL
1 stop12h 02mSpirit Airlines
Sun 4/66:47 pmSTL - BWI
1 stop13h 28mSpirit Airlines
Deal found 3/4$173
This Southwest deal was found by Cheapflights users on 3/5. 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 Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 4/77:40 pmBWI - STL
Nonstop2h 20mSouthwest
Thu 4/109:10 pmSTL - BWI
Nonstop2h 00mSouthwest
Deal found 3/5$177
This Delta deal was found by Cheapflights users on 3/5. 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.
Wed 3/196:00 amBWI - STL
1 stop7h 00mDelta
Fri 3/287:10 pmSTL - BWI
1 stop4h 19mDelta
Deal found 3/5$217
This American Airlines deal was found by Cheapflights users on 3/4. 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.
Wed 6/257:48 amDCA - STL
Nonstop2h 20mAmerican Airlines
Mon 6/306:02 amSTL - DCA
Nonstop2h 01mAmerican Airlines
Deal found 3/4$229
This Trip.com deal was found by Cheapflights users on 3/4. 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 Trip.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 3/176:03 pmIAD - STL
1 stop6h 46mFrontier
Sun 3/238:58 amSTL - IAD
1 stop6h 56mFrontier
Deal found 3/4$235
This United Airlines deal was found by Cheapflights users on 3/4. 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.
Sun 4/66:20 amIAD - STL
1 stop5h 43mUnited Airlines
Wed 4/98:25 amSTL - IAD
Nonstop2h 09mUnited Airlines
Deal found 3/4$237
This Southwest deal was found by Cheapflights users on 3/4. 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 Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 3/278:00 amDCA - STL
Nonstop2h 20mSouthwest
Mon 3/311:20 pmSTL - DCA
Nonstop1h 55mSouthwest
Deal found 3/4$238
This Delta deal was found by Cheapflights users on 3/4. 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.
Thu 5/226:00 amIAD - STL
1 stop4h 00mDelta
Tue 5/273:40 pmSTL - IAD
1 stop4h 54mDelta
Deal found 3/4$239
This Delta deal was found by Cheapflights users on 3/5. 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.
Thu 3/206:00 amDCA - STL
1 stop6h 58mDelta
Fri 3/283:36 pmSTL - DCA
1 stop6h 13mDelta
Deal found 3/5$239
This Sun Country Air deal was found by Cheapflights users on 3/5. 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 Sun Country Air is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 9/1812:23 pmBWI - STL
1 stop24h 06mSun Country Air
Sun 9/217:34 amSTL - BWI
1 stop8h 07mSun Country Air
Deal found 3/5$245

Find flights from Washington, D.C. to St. Charles within your budget

Customize your flight search to find flights from Washington, D.C. to St. Charles 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 March 5, 2025.

Fly from

Washington, D.C.

Fly to

St. Charles

Route

Depart

Return

Price

BaltimoreSt. Louis

BWI - STL

BWISTL

Baltimore/Washington

Tue 4/8

10:35 am-11:46 pm

1 stop14h 11m

Lambert-St Louis

Wed 4/9

4:57 pm-3:17 pm

1 stop21h 20m

$150

BaltimoreSt. Louis

BWI - STL

BWISTL

Baltimore/Washington

Wed 4/9

4:06 pm-11:46 pm

1 stop8h 40m

Lambert-St Louis

Sun 4/13

6:10 pm-12:56 am

1 stop5h 46m

$164

BaltimoreSt. Louis

BWI - STL

BWISTL

Baltimore/Washington

Thu 4/3

6:50 am-5:52 pm

1 stop12h 02m

Lambert-St Louis

Sun 4/6

6:47 pm-9:15 am

1 stop13h 28m

$173

BaltimoreSt. Louis

BWI - STL

BWISTL

Baltimore/Washington

Mon 4/7

7:40 pm-9:00 pm

Nonstop2h 20m

Lambert-St Louis

Thu 4/10

9:10 pm-12:10 am

Nonstop2h 00m

$177

BaltimoreSt. Louis

BWI - STL

BWISTL

Baltimore/Washington

Wed 3/19

6:00 am-12:00 pm

1 stop7h 00m

Lambert-St Louis

Tue 3/25

6:00 am-1:05 pm

1 stop6h 05m

$197

Washington, D.C.St. Louis

DCA - STL

DCASTL

Washington, D.C. Reagan-National

Wed 6/25

7:48 am-9:08 am

Nonstop2h 20m

Lambert-St Louis

Mon 6/30

6:02 am-9:03 am

Nonstop2h 01m

$229

Washington, D.C.St. Louis

IAD - STL

IADSTL

Washington, D.C. Dulles Intl

Mon 3/17

6:03 pm-11:49 pm

1 stop6h 46m

Lambert-St Louis

Sun 3/23

8:58 am-4:54 pm

1 stop6h 56m

$235

Washington, D.C.St. Louis

IAD - STL

IADSTL

Washington, D.C. Dulles Intl

Sun 4/6

6:20 am-11:03 am

1 stop5h 43m

Lambert-St Louis

Wed 4/9

8:25 am-11:34 am

Nonstop2h 09m

$237

Washington, D.C.St. Louis

DCA - STL

DCASTL

Washington, D.C. Reagan-National

Thu 3/27

8:00 am-9:20 am

Nonstop2h 20m

Lambert-St Louis

Mon 3/31

1:20 pm-4:15 pm

Nonstop1h 55m

$238

Washington, D.C.St. Louis

IAD - STL

IADSTL

Washington, D.C. Dulles Intl

Thu 5/22

6:00 am-9:00 am

1 stop4h 00m

Lambert-St Louis

Tue 5/27

3:40 pm-9:34 pm

1 stop4h 54m

$239

Flights are sorted by cheapest round-trip flights first.

Deals found on 3/5

Showing 1-10 of 36 results
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Best time to book a flight from Washington, D.C. to St. Charles

Have a flexible travel schedule? Discover the best time to fly to St. Charles 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.

Travel insights for flights from Washington, D.C. to St. Charles

Get recent, data-driven insights about flights from Washington, D.C. to St. Charles including ideal travel times, pricing trends, and more.

How far ahead should I book a flight from Washington, D.C. to St. Charles?

Use this chart to determine the optimal time to book a round-trip flight from Washington, D.C. to St. Charles. Price data was last updated on February 28, 2025.

Booking 89 days in advance of your planned departure date is, on average, the best time to get cheap flights from Washington, D.C. to St. Charles. The general trend is that the closer you book to the departure date, the more expensive your flight will be.

What is the cheapest month to book a flight from Washington, D.C. to St. Charles?

Currently, August is the cheapest month in which you can book a flight from Washington, D.C. to St. Charles (average of $311). Flying from Washington, D.C. to St. Charles in March is currently the most expensive (average of $356). 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 CH5?

Find hourly flight availability from Washington, D.C. to St. Charles. Discover flight options and departure times throughout the day, allowing you to choose a departure time that suits your schedule. Data last updated March 5, 2025.

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

What is the cheapest day to fly from Washington, D.C. to St. Charles?

Use this chart to determine the cheapest time to fly round-trip from Washington, D.C. to St. Charles. Price data was last updated on December 16, 2024.

Travelers seeking maximum savings on their Washington, D.C. to St. Charles flight should consider departing on Sunday at noon when fares are most often at their lowest. Saturday afternoons flights should be avoided if possible as fares are typically the most expensive at this time.

Rainfall in St. Charles by month

Plan your trip to St. Charles by taking into account the average rainfall totals by month.

In terms of precipitation, rainfall in St. Charles ranges from 2.2 - 4.7 inches per month. May is typically the wettest month, when rainfall can reach 4.7 in. February is typically the driest time to visit St. Charles when rainfall is around 2.2 in.

Temperature in St. Charles by month

Plan your trip to St. Charles by taking into account the average temperature totals by month.

If weather is an important factor for your trip to St. Charles, 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 32.0 F).

Reviews of airlines servicing St. Charles

Get insights into the airlines that provide service to St. Charles. 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 St. Charles. Reviews last updated March 5, 2025.
To help decide which airline to fly from Washington, D.C. to St. Charles, see what other customers have to say about Southwest, Alaska Airlines and Delta. Users have also rated airlines in terms of entertainment options, comfort, food, crew/service, and boarding process.
Southwest
8.1
Very good
4,321 reviews

Comfort

8.1

Boarding

8.2

Crew

8.7

Food

7.1

Entertainment

7.6

Overall

8.1

Reviews

1 / 20

8.0
Excellent

Ila,Mar 2025

HOU - DAL

Our original flight was delayed. We were able to change our flight and got home at close to the same time. Looking forward to when you have assigned seating.

Southwest
8.1
Very good
4,321 reviews
Southwest
8.1
Very good
4,321 reviews

Comfort

8.1

Boarding

8.2

Crew

8.7

Food

7.1

Entertainment

7.6

Overall

8.1

Reviews

1 / 20

8.0
Excellent

Ila,Mar 2025

HOU - DAL

Our original flight was delayed. We were able to change our flight and got home at close to the same time. Looking forward to when you have assigned seating.

Alaska Airlines
8.0
Very good
9,709 reviews
Southwest
8.1
Very good
4,321 reviews

Comfort

8.1

Boarding

8.2

Crew

8.7

Food

7.1

Entertainment

7.6

Overall

8.1

Reviews

1 / 20

8.0
Excellent

Ila,Mar 2025

HOU - DAL

Our original flight was delayed. We were able to change our flight and got home at close to the same time. Looking forward to when you have assigned seating.

Delta
8.0
Very good
8,045 reviews
Southwest
8.1
Very good
4,321 reviews

Comfort

8.1

Boarding

8.2

Crew

8.7

Food

7.1

Entertainment

7.6

Overall

8.1

Reviews

1 / 20

8.0
Excellent

Ila,Mar 2025

HOU - DAL

Our original flight was delayed. We were able to change our flight and got home at close to the same time. Looking forward to when you have assigned seating.

United Airlines
7.4
Good
8,660 reviews
Southwest
8.1
Very good
4,321 reviews

Comfort

8.1

Boarding

8.2

Crew

8.7

Food

7.1

Entertainment

7.6

Overall

8.1

Reviews

1 / 20

8.0
Excellent

Ila,Mar 2025

HOU - DAL

Our original flight was delayed. We were able to change our flight and got home at close to the same time. Looking forward to when you have assigned seating.

American Airlines
7.2
Good
10,000 reviews
Southwest
8.1
Very good
4,321 reviews

Comfort

8.1

Boarding

8.2

Crew

8.7

Food

7.1

Entertainment

7.6

Overall

8.1

Reviews

1 / 20

8.0
Excellent

Ila,Mar 2025

HOU - DAL

Our original flight was delayed. We were able to change our flight and got home at close to the same time. Looking forward to when you have assigned seating.

Related info for your journey

Find useful and relevant information for your journey from Washington, D.C. to St. Charles. 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 Washington, D.C. to St. Charles one-way?

    One-way options have recently been found by users for as low as $68 on Spirit Airlines. Other airlines that offer cheap prices include Frontier from $75 and Southwest from $89 one-way.

  • What are the most popular routes from Washington, D.C. to St. Charles?

    Most travelers choose Washington, D.C. Dulles Intl - Lambert-St Louis, Washington, D.C. Reagan-National - Lambert-St Louis or Baltimore/Washington - Lambert-St Louis when deciding on the best route from Washington, D.C. to St. Charles.

  • What are the most reliable airlines from Washington, D.C. to St. Charles?

    No one likes to see their flight delayed. When booking a flight from Washington, D.C. to St. Charles consider choosing GoJet (75%), Avianca (75%) or Copa Airlines (75%) as they are the most reliable in getting you off to your destination on time.

  • What are the cheapest flights from Washington, D.C. to St. Charles?

    While on average a flight from Washington, D.C. to St. Charles is generally $389, our data shows the cheapest flight currently is $137. When looking at the most popular route, (Washington, D.C. Dulles Intl - Lambert-St Louis), you can expect to pay $177 for that flight.

  • Can I find deals for flights from Washington, D.C. to St. Charles that include hotel bookings?

    Yes. In addition to deals on Washington, D.C. to St. Charles flights, Cheapflights offers vacation packages that include both flights and hotel.

  • How can I find direct flights from Washington, D.C. to St. Charles?

    After entering your origin and destination, apply the non-stop filter on the search result page to find direct flights from Washington, D.C. to St. Charles.

  • Can I find deals for business class flights from Washington, D.C. to St. Charles?

    Yes. Cheapflights offers flight deals from Washington, D.C. to St. Charles 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 Washington, D.C. to St. Charles?

    Currently, August is the cheapest month in which you can book a flight from Washington, D.C. to St. Charles (average of $311). Flying from Washington, D.C. to St. Charles in March is currently the most expensive (average of $356). 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

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Top 6 airlines flying from Washington, D.C. to St. Charles

Discover the top 6 airlines that operate flights from Washington, D.C. to St. Charles. 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 March 5, 2025.
AirlineCheapestAverageFlexibilityOn-time
FrontierCheapest$108Average$176FlexibilityNo cancel feeOn-time62%
Spirit AirlinesCheapest$133Average$231FlexibilityNo cancel feeOn-time65%
United AirlinesCheapest$158Average$399FlexibilityNo cancel feeOn-time69%
DeltaCheapest$175Average$319FlexibilityNo cancel feeOn-timeN/A
American AirlinesCheapest$184Average$437FlexibilityNo cancel feeOn-time71%
SouthwestCheapest$219Average$360FlexibilityNo cancel feeOn-time63%
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