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St. Charles

$55+ 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 2/25. Fares are subject to change and may not be available on all flights or dates of travel.
WAS — STL
Feb 4 — Feb 111
Tue 2/4
Tue 2/11
1 adult, Economy
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The best prices from Washington, D.C. to St. Charles are usually found in August or April, booked 61 days in advance, depart on a Wednesday or Friday and return on a Friday

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

Discover tips and strategies to find the most affordable flight options for your journey from Washington, D.C. (WAS) to St. Charles (CH5). 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 30, 2025.

Most accurate provider

FlightHub
3 stars

Most trusted provider

FlightHub
3 stars

Round-trip from

$117
(Mytrip)

One-way from

$55
(Frontier)

Popular in

January

Cheapest in

August

Average price

$426
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
Search Deals
One-way flight from Washington, D.C. (WAS) to St. Charles
Search Deals
Highest demand for flights based on searches. 10% potential increase in price ($37 potential increase over avg. RT price).
Search Deals
Cheapest flight prices on average. 2% potential price decrease ($9 potential savings vs. average RT price).
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Average for round-trip flights in January 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 January 30, 2025.

This Mytrip deal was found by Cheapflights users on 1/29. 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 Mytrip is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 2/265:00 pmBWI - STL
1 stop7h 43mFrontier
Wed 3/55:20 pmSTL - BWI
1 stop13h 01mFrontier
Deal found 1/29$117
This Cheapflightsfares deal was found by Cheapflights users on 1/28. 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 Cheapflightsfares is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 2/275:25 amBWI - STL
1 stop10h 17mSpirit Airlines
Thu 3/65:38 pmSTL - BWI
1 stop6h 19mSpirit Airlines
Deal found 1/28$166
This Booking.com deal was found by Cheapflights users on 1/29. 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 Booking.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 2/278:45 amBWI - STL
1 stop6h 57mMultiple Airlines
Mon 3/35:20 pmSTL - BWI
1 stop13h 01mMultiple Airlines
Deal found 1/29$169
This Southwest deal was found by Cheapflights users on 1/29. 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 2/206:30 amBWI - STL
Nonstop2h 35mSouthwest
Mon 2/2410:30 amSTL - BWI
Nonstop1h 55mSouthwest
Deal found 1/29$179
This Delta deal was found by Cheapflights users on 1/29. 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 2/206:00 amBWI - STL
1 stop4h 36mDelta
Mon 2/246:00 amSTL - BWI
1 stop5h 54mDelta
Deal found 1/29$197
This Delta deal was found by Cheapflights users on 1/30. 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 2/2112:56 pmIAD - STL
1 stop6h 05mDelta
Mon 2/244:40 pmSTL - IAD
1 stop6h 40mDelta
Deal found 1/30$234
This Delta deal was found by Cheapflights users on 1/30. 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 3/146:00 amDCA - STL
1 stop6h 58mDelta
Tue 3/181:48 pmSTL - DCA
1 stop4h 31mDelta
Deal found 1/30$234
This Booking.com deal was found by Cheapflights users on 1/30. 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 Booking.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 3/185:54 pmIAD - STL
1 stop6h 55mFrontier
Fri 3/215:24 pmSTL - IAD
1 stop22h 30mFrontier
Deal found 1/30$238
This American Airlines deal was found by Cheapflights users on 1/29. 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.
Sun 3/26:59 amDCA - STL
1 stop5h 26mAmerican Airlines
Wed 3/56:04 amSTL - DCA
Nonstop2h 15mAmerican Airlines
Deal found 1/29$238
This Southwest deal was found by Cheapflights users on 1/29. 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.
Wed 3/268:00 amDCA - STL
Nonstop2h 20mSouthwest
Sun 3/308:50 pmSTL - DCA
Nonstop1h 55mSouthwest
Deal found 1/29$239
This United Airlines deal was found by Cheapflights users on 1/30. 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.
Thu 2/278:35 amIAD - STL
Nonstop2h 30mUnited Airlines
Mon 3/33:32 pmSTL - IAD
1 stop4h 37mUnited Airlines
Deal found 1/30$241
This Trip.com deal was found by Cheapflights users on 1/29. 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.
Thu 2/61:01 pmDCA - STL
1 stop21h 15mFrontier
Sat 2/87:09 pmSTL - DCA
1 stop15h 57mFrontier
Deal found 1/29$262

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 January 30, 2025.

Fly from

Any airport

Fly to

Any airport

Route

Depart

Return

Price

BaltimoreSt. Louis

BWI - STL

BWISTL

Baltimore/Washington

Wed 2/26

5:00 pm-11:43 pm

1 stop7h 43m

Lambert-St Louis

Wed 3/5

5:20 pm-7:21 am

1 stop13h 01m

$117

BaltimoreSt. Louis

BWI - STL

BWISTL

Baltimore/Washington

Thu 2/27

5:25 am-2:42 pm

1 stop10h 17m

Lambert-St Louis

Mon 3/3

5:20 pm-7:21 am

1 stop13h 01m

$151

BaltimoreSt. Louis

BWI - STL

BWISTL

Baltimore/Washington

Thu 2/27

5:25 am-2:42 pm

1 stop10h 17m

Lambert-St Louis

Thu 3/6

5:38 pm-12:57 am

1 stop6h 19m

$166

BaltimoreSt. Louis

BWI - STL

BWISTL

Baltimore/Washington

Thu 2/20

6:30 am-8:05 am

Nonstop2h 35m

Lambert-St Louis

Mon 2/24

10:30 am-1:25 pm

Nonstop1h 55m

$179

BaltimoreSt. Louis

BWI - STL

BWISTL

Baltimore/Washington

Thu 2/20

6:00 am-9:36 am

1 stop4h 36m

Lambert-St Louis

Mon 2/24

6:00 am-12:54 pm

1 stop5h 54m

$197

Washington, D.C.St. Louis

DCA - STL

DCASTL

Washington, D.C. Reagan-National

Mon 2/24

7:35 pm-10:30 pm

1 stop3h 55m

Lambert-St Louis

Fri 2/28

7:50 am-3:00 pm

1 stop6h 10m

$233

Washington, D.C.St. Louis

IAD - STL

IADSTL

Washington, D.C. Dulles Intl

Fri 2/21

12:56 pm-6:01 pm

1 stop6h 05m

Lambert-St Louis

Mon 2/24

4:40 pm-12:20 am

1 stop6h 40m

$234

Washington, D.C.St. Louis

DCA - STL

DCASTL

Washington, D.C. Reagan-National

Fri 3/14

6:00 am-11:58 am

1 stop6h 58m

Lambert-St Louis

Tue 3/18

1:48 pm-7:19 pm

1 stop4h 31m

$234

Washington, D.C.St. Louis

DCA - STL

DCASTL

Washington, D.C. Reagan-National

Sun 3/2

6:00 am-9:52 am

1 stop4h 52m

Lambert-St Louis

Thu 3/6

6:00 am-9:15 am

Nonstop2h 15m

$238

Washington, D.C.St. Louis

IAD - STL

IADSTL

Washington, D.C. Dulles Intl

Tue 3/18

5:54 pm-11:49 pm

1 stop6h 55m

Lambert-St Louis

Fri 3/21

5:24 pm-4:54 pm

1 stop22h 30m

$238

Flights are sorted by cheapest round-trip flights first.

Deals found on 1/30

Showing 1-10 of 37 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 January 24, 2025.

Booking 61 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 January 30, 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.

Weekly flight availability from Washington, D.C. to St. Charles

Explore weekly flight availability from Washington, D.C. to St. Charles. 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 30, 2025.

The most flights from WAS to CH5 are scheduled on a Monday (14 on average). You will have fewer flight options on Saturday, which is when the least amount of flights are scheduled (8 on average).

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 January 30, 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
4,585 reviews

Overall

8.1

Crew

8.7

Boarding

8.2

Entertainment

7.7

Food

7.1

Comfort

8.1

Reviews

1 / 20

6.0
Good

Lauren,Dec 2024

MCI - DCA

We BARELY made the connection and when we got onboard we were treated like disobedient children who should have arrived earlier because we had to ask other passengers to move so we could sit with our kids. The flight attendants on the first flight were nice but the second one, they were snippy and fairly rude.

Southwest
8.1
Very good
4,585 reviews
Southwest
8.1
Very good
4,585 reviews

Overall

8.1

Crew

8.7

Boarding

8.2

Entertainment

7.7

Food

7.1

Comfort

8.1

Reviews

1 / 20

6.0
Good

Lauren,Dec 2024

MCI - DCA

We BARELY made the connection and when we got onboard we were treated like disobedient children who should have arrived earlier because we had to ask other passengers to move so we could sit with our kids. The flight attendants on the first flight were nice but the second one, they were snippy and fairly rude.

Alaska Airlines
8.0
Very good
9,688 reviews
Southwest
8.1
Very good
4,585 reviews

Overall

8.1

Crew

8.7

Boarding

8.2

Entertainment

7.7

Food

7.1

Comfort

8.1

Reviews

1 / 20

6.0
Good

Lauren,Dec 2024

MCI - DCA

We BARELY made the connection and when we got onboard we were treated like disobedient children who should have arrived earlier because we had to ask other passengers to move so we could sit with our kids. The flight attendants on the first flight were nice but the second one, they were snippy and fairly rude.

Delta
8.0
Very good
8,454 reviews
Southwest
8.1
Very good
4,585 reviews

Overall

8.1

Crew

8.7

Boarding

8.2

Entertainment

7.7

Food

7.1

Comfort

8.1

Reviews

1 / 20

6.0
Good

Lauren,Dec 2024

MCI - DCA

We BARELY made the connection and when we got onboard we were treated like disobedient children who should have arrived earlier because we had to ask other passengers to move so we could sit with our kids. The flight attendants on the first flight were nice but the second one, they were snippy and fairly rude.

United Airlines
7.4
Good
8,913 reviews
Southwest
8.1
Very good
4,585 reviews

Overall

8.1

Crew

8.7

Boarding

8.2

Entertainment

7.7

Food

7.1

Comfort

8.1

Reviews

1 / 20

6.0
Good

Lauren,Dec 2024

MCI - DCA

We BARELY made the connection and when we got onboard we were treated like disobedient children who should have arrived earlier because we had to ask other passengers to move so we could sit with our kids. The flight attendants on the first flight were nice but the second one, they were snippy and fairly rude.

American Airlines
7.2
Good
10,000 reviews
Southwest
8.1
Very good
4,585 reviews

Overall

8.1

Crew

8.7

Boarding

8.2

Entertainment

7.7

Food

7.1

Comfort

8.1

Reviews

1 / 20

6.0
Good

Lauren,Dec 2024

MCI - DCA

We BARELY made the connection and when we got onboard we were treated like disobedient children who should have arrived earlier because we had to ask other passengers to move so we could sit with our kids. The flight attendants on the first flight were nice but the second one, they were snippy and fairly rude.

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.

  • How popular is this Washington, D.C. to St. Charles flight route?

    Flights from Washington, D.C. to St. Charles have been viewed 4 times in the past calendar month.

  • 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 $55 on Frontier. Other airlines that offer cheap prices include Spirit Airlines from $81 and Southwest from $90 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 cheapest flights from Washington, D.C. to St. Charles?

    While on average a flight from Washington, D.C. to St. Charles is generally $331, our data shows the cheapest flight currently is $159. When looking at the most popular route, (Washington, D.C. Dulles Intl - Lambert-St Louis), you can expect to pay $155 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 January 30, 2025.
AirlineCheapestAverageFlexibilityOn-time
FrontierCheapest$98Average$167FlexibilityNo cancel feeOn-time62%
Spirit AirlinesCheapest$133Average$189FlexibilityNo cancel feeOn-time65%
United AirlinesCheapest$158Average$399FlexibilityNo cancel feeOn-time69%
DeltaCheapest$175Average$318FlexibilityNo cancel feeOn-timeN/A
American AirlinesCheapest$183Average$471FlexibilityNo cancel feeOn-time71%
SouthwestCheapest$224Average$370FlexibilityNo cancel feeOn-time63%
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