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

Flights from Washington, D.C. to St. Charles have been viewed 20 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 $91 on Spirit Airlines. Other airlines that offer cheap prices include Frontier from $99 and Southwest from $109 one-way.

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.

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).

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

Most travelers choose Washington, D.C. Dulles Intl - Lambert-St Louis, Baltimore/Washington - Lambert-St Louis or Washington, D.C. Reagan-National - 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 $288, our data shows the cheapest flight currently is $98. When looking at the most popular route, (Washington, D.C. Dulles Intl - Lambert-St Louis), you can expect to pay $209 for that flight.

What are the most popular airlines that fly from Washington, D.C. to St. Charles?

When booking a flight from Washington, D.C. to St. Charles, you may want to consider flying on American Airlines, Delta or Frontier as they are the most popular for this route.

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

To save up to 160% on this flight, we recommend booking at least 29 days prior to travel. The price may fluctuate and will likely increase closer to your departure date. Users on Cheapflights have found tickets from Washington, D.C. to St. Charles from $389 1-2 weeks out and tickets from $639 for flights departing within the next 72 hours.

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

The best pricing can be found in the month of August. Prices to St. Charles from Washington, D.C. average $326. You can even find prices in August for less than $326, as users have found deals to St. Charles from as low as $149. The month of March appears to be one of the more expensive times to travel to St. Charles from Washington, D.C.. Flying in the targeted month can save you up to 14%.

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.

$86+ Flights from Washington, D.C. to St. Charles

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Find cheap flights from Washington, D.C. to St. Charles 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.

Cheapflights Tip: The best prices from Washington, D.C. to St. Charles are usually found in August or May, 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

Round-trip from	$161 (FlightHub)
One-way from	$91 (FlightHub)
Popular in	March
Cheapest in	August
Average price	$321

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. 7% potential increase in price ($28 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 July 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 July 31, 2025.

Wed 8/202:30 pmBWI - STL

1 stop24h 02mSpirit Airlines

Sun 8/312:30 pmSTL - BWI

1 stop6h 39mSpirit Airlines

Deal found 7/29

$161

Fri 8/226:10 amBWI - STL

1 stop7h 46mMultiple Airlines

Mon 8/252:30 pmSTL - BWI

1 stop6h 39mMultiple Airlines

Deal found 7/29

$169

Tue 8/122:59 pmBWI - STL

1 stop9h 48mFrontier

Sat 8/162:52 pmSTL - BWI

1 stop8h 07mFrontier

Deal found 7/30

$198

Sat 8/161:37 pmIAD - STL

1 stop11h 10mFrontier

Mon 8/182:37 pmSTL - IAD

1 stop14h 57mFrontier

Deal found 7/31

$208

Wed 8/278:40 amIAD - STL

Nonstop2h 22mUnited Airlines

Wed 9/38:15 amSTL - IAD

Nonstop2h 10mUnited Airlines

Deal found 7/30

$217

Tue 8/192:35 pmBWI - STL

Nonstop2h 10mSouthwest

Wed 8/206:50 pmSTL - BWI

Nonstop2h 00mSouthwest

Deal found 7/29

$217

Wed 9/108:30 amDCA - STL

Nonstop2h 51mAmerican Airlines

Sat 9/137:01 amSTL - DCA

Nonstop2h 02mAmerican Airlines

Deal found 7/30

$217

Wed 10/151:00 pmDCA - STL

1 stop21h 07mFrontier

Sat 10/187:52 pmSTL - DCA

1 stop15h 12mFrontier

Deal found 7/31

$218

Wed 9/1010:51 amBWI - STL

1 stop4h 28mUnited Airlines

Tue 9/166:35 amSTL - BWI

1 stop6h 13mUnited Airlines

Deal found 7/31

$227

Sat 8/236:40 pmDCA - STL

Nonstop2h 10mSouthwest

Wed 9/311:10 amSTL - DCA

1 stop5h 05mSouthwest

Deal found 7/30

$227

Tue 8/196:20 pmBWI - STL

1 stop4h 57mAmerican Airlines

Thu 8/216:00 amSTL - BWI

1 stop4h 52mAmerican Airlines

Deal found 7/29

$232

Wed 12/37:00 amIAD - STL

1 stop6h 57mDelta

Sat 12/610:45 amSTL - IAD

1 stop4h 46mDelta

Deal found 7/31

$237

Best flights from Washington, D.C. to St. Charles
Discover carefully curated flight deals from Washington, D.C. to St. Charles that have cost, travel time, and layovers in mind to ensure you get the best travel experience. Data last updated July 31, 2025.

Wed 8/202:30 pmBWI - STL

1 stop24h 02mSpirit Airlines

Sun 8/312:30 pmSTL - BWI

1 stop6h 39mSpirit Airlines

Deal found 7/29

$161

Fri 8/226:10 amBWI - STL

1 stop7h 46mMultiple Airlines

Mon 8/252:30 pmSTL - BWI

1 stop6h 39mMultiple Airlines

Deal found 7/29

$169

Tue 8/122:59 pmBWI - STL

1 stop9h 48mFrontier

Sat 8/162:52 pmSTL - BWI

1 stop8h 07mFrontier

Deal found 7/30

$198

Wed 8/278:40 amIAD - STL

Nonstop2h 22mUnited Airlines

Wed 9/38:15 amSTL - IAD

Nonstop2h 10mUnited Airlines

Deal found 7/30

$217

Tue 8/192:35 pmBWI - STL

Nonstop2h 10mSouthwest

Wed 8/206:50 pmSTL - BWI

Nonstop2h 00mSouthwest

Deal found 7/29

$217

Wed 9/108:30 amDCA - STL

Nonstop2h 51mAmerican Airlines

Sat 9/137:01 amSTL - DCA

Nonstop2h 02mAmerican Airlines

Deal found 7/30

$217

Wed 8/277:22 amIAD - STL

1 stop6h 09mDelta

Wed 9/36:00 amSTL - IAD

1 stop4h 23mDelta

Deal found 7/29

$237

Sat 8/161:37 pmIAD - STL

1 stop11h 10mFrontier

Mon 8/182:37 pmSTL - IAD

1 stop14h 57mFrontier

Deal found 7/31

$208

Wed 9/1010:51 amBWI - STL

1 stop4h 28mUnited Airlines

Tue 9/166:35 amSTL - BWI

1 stop6h 13mUnited Airlines

Deal found 7/31

$227

Sat 8/236:40 pmDCA - STL

Nonstop2h 10mSouthwest

Wed 9/311:10 amSTL - DCA

1 stop5h 05mSouthwest

Deal found 7/30

$227

Tue 8/196:20 pmBWI - STL

1 stop4h 57mAmerican Airlines

Thu 8/216:00 amSTL - BWI

1 stop4h 52mAmerican Airlines

Deal found 7/29

$232

Wed 10/151:00 pmDCA - STL

1 stop21h 07mFrontier

Sat 10/187:52 pmSTL - DCA

1 stop15h 12mFrontier

Deal found 7/31

$218

Last-minute flights from Washington, D.C. to St. Charles
Discover last-minute flight deals from Washington, D.C. to St. Charles. Data last updated July 31, 2025 and is based on user searches.

Tue 8/57:00 amDCA - STL

1 stop27h 11mFrontier

Wed 8/67:29 pmSTL - DCA

1 stop15h 35mFrontier

Deal found 7/29

$265

Wed 8/65:45 amBWI - STL

1 stop5h 44mMultiple Airlines

Tue 8/125:40 pmSTL - BWI

1 stop16h 18mMultiple Airlines

Deal found 7/28

$234

Wed 8/62:50 pmDCA - STL

Nonstop2h 10mSouthwest

Tue 8/123:15 pmSTL - DCA

Nonstop2h 00mSouthwest

Deal found 7/28

$491

Wed 8/612:45 pmIAD - STL

1 stop4h 33mDelta

Tue 8/129:17 amSTL - IAD

1 stop4h 14mDelta

Deal found 7/28

$511

Thu 8/76:10 amIAD - STL

1 stop8h 24mFrontier

Sat 8/92:52 pmSTL - IAD

1 stop7h 34mFrontier

Deal found 7/30

$208

Thu 8/72:50 pmBWI - STL

1 stop20h 02mSpirit Airlines

Sun 8/1010:47 amSTL - BWI

1 stop19h 52mSpirit Airlines

Deal found 7/29

$288

Thu 8/77:51 pmDCA - STL

Nonstop2h 11mAmerican Airlines

Mon 8/115:52 pmSTL - DCA

Nonstop2h 01mAmerican Airlines

Deal found 7/29

$526

Fri 8/85:13 pmIAD - STL

1 stop6h 32mUnited Airlines

Mon 8/118:15 amSTL - IAD

Nonstop2h 08mUnited Airlines

Deal found 7/28

$536

Sat 8/97:15 amBWI - STL

1 stop7h 44mFrontier

Sun 8/102:36 pmSTL - BWI

1 stop8h 49mFrontier

Deal found 7/28

$208

Sun 8/1011:58 amIAD - STL

2 stops7h 43mMultiple Airlines

Sun 8/1710:37 amSTL - IAD

3 stops26h 46mMultiple Airlines

Deal found 7/30

$368

Sun 8/108:00 amDCA - STL

1 stop5h 34mDelta

Sat 8/166:00 amSTL - DCA

1 stop4h 20mDelta

Deal found 7/30

$511

Sun 8/107:00 pmDCA - STL

1 stop4h 45mUnited Airlines

Mon 8/186:33 amSTL - DCA

1 stop4h 26mUnited Airlines

Deal found 7/30

$546

One-way flights from Washington, D.C. to St. Charles
Search for one-way flight options from Washington, D.C. to St. Charles. Find affordable one-way fares based on user searches. Data last updated July 31, 2025.

Wed 8/272:30 pmBWI - STL

1 stop24h 02mSpirit Airlines

Deal found 7/29

$86

Sat 8/306:50 amBWI - STL

1 stop7h 43mFrontier

Deal found 7/30

$99

Sat 8/96:10 amIAD - STL

1 stop8h 49mFrontier

Deal found 7/30

$105

Tue 9/3011:35 amBWI - STL

Nonstop2h 10mSouthwest

Deal found 7/31

$109

Sat 8/302:56 pmDCA - STL

Nonstop2h 18mAmerican Airlines

Deal found 7/30

$109

Wed 10/297:05 amBWI - STL

1 stop4h 21mDelta

Deal found 7/30

$114

Sat 10/111:00 pmDCA - STL

1 stop21h 07mFrontier

Deal found 7/31

$115

Tue 10/2112:09 pmIAD - STL

1 stop5h 34mDelta

Deal found 7/31

$119

Sat 9/277:00 amDCA - STL

1 stop5h 22mDelta

Deal found 7/31

$119

Tue 9/3010:55 amDCA - STL

2 stops7h 55mSouthwest

Deal found 7/31

$124

Wed 9/108:40 amIAD - STL

Nonstop2h 22mUnited Airlines

Deal found 7/29

$125

Mon 10/204:39 pmIAD - STL

2 stops18h 20mMultiple Airlines

Deal found 7/31

$133

Cheapflights Fare Finder

Use the filters below to find and compare flights from Washington, D.C. to St. Charles that are best for you.

Fly from

Fly to

Route

Depart

Return

Price

BaltimoreSt. Louis

BWI - STL

BWISTL

Baltimore/Washington

Wed 8/20

2:30 pm-1:32 pm

1 stop24h 02m

Lambert-St Louis

Sun 8/31

2:30 pm-10:09 pm

1 stop6h 39m

$161

BaltimoreSt. Louis

BWI - STL

BWISTL

Baltimore/Washington

Fri 8/22

6:10 am-12:56 pm

1 stop7h 46m

Lambert-St Louis

Mon 8/25

2:30 pm-10:09 pm

1 stop6h 39m

$169

BaltimoreSt. Louis

BWI - STL

BWISTL

Baltimore/Washington

Tue 8/12

2:59 pm-11:47 pm

1 stop9h 48m

Lambert-St Louis

Sat 8/16

2:52 pm-11:59 pm

1 stop8h 07m

$198

Washington, D.C.St. Louis

IAD - STL

IADSTL

Washington, D.C. Dulles Intl

Sat 8/16

1:37 pm-11:47 pm

1 stop11h 10m

Lambert-St Louis

Mon 8/18

2:37 pm-6:34 am

1 stop14h 57m

$208

Washington, D.C.St. Louis

IAD - STL

IADSTL

Washington, D.C. Dulles Intl

Wed 8/27

8:40 am-10:02 am

Nonstop2h 22m

Lambert-St Louis

Wed 9/3

8:15 am-11:25 am

Nonstop2h 10m

$217

BaltimoreSt. Louis

BWI - STL

BWISTL

Baltimore/Washington

Tue 8/19

2:35 pm-3:45 pm

Nonstop2h 10m

Lambert-St Louis

Wed 8/20

6:50 pm-9:50 pm

Nonstop2h 00m

$217

Washington, D.C.St. Louis

DCA - STL

DCASTL

Washington, D.C. Reagan-National

Wed 9/10

8:30 am-10:21 am

Nonstop2h 51m

Lambert-St Louis

Sat 9/13

7:01 am-10:03 am

Nonstop2h 02m

$217

Washington, D.C.St. Louis

DCA - STL

DCASTL

Washington, D.C. Reagan-National

Wed 10/15

1:00 pm-9:07 am

1 stop21h 07m

Lambert-St Louis

Sat 10/18

7:52 pm-12:04 pm

1 stop15h 12m

$218

BaltimoreSt. Louis

BWI - STL

BWISTL

Baltimore/Washington

Wed 9/10

10:51 am-2:19 pm

1 stop4h 28m

Lambert-St Louis

Tue 9/16

6:35 am-1:48 pm

1 stop6h 13m

$227

Washington, D.C.St. Louis

DCA - STL

DCASTL

Washington, D.C. Reagan-National

Sat 8/23

6:40 pm-7:50 pm

Nonstop2h 10m

Lambert-St Louis

Wed 9/3

11:10 am-5:15 pm

1 stop5h 05m

$227

Flights are sorted by cheapest round-trip flights first.

Deals found on 7/29

Showing 1-10 of 33 results

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.

Cheapflights Insights

Everything you need to know about your flight from Washington, D.C. to St. Charles

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

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?

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?

Travelers seeking maximum savings on their Washington, D.C. to St. Charles flight should consider departing on Wednesday evenings when fares are most often at their lowest. Tuesday evenings 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

The most flights from WAS to CH5 are scheduled on a Monday (16 on average). You will have fewer flight options on Saturday, which is when the least amount of flights are scheduled (9 on average).

Reviews of airlines servicing St. Charles

Read reviews from past customers who have flown Southwest, Delta, and United Airlines from Washington, D.C. to St. Charles. Users can see the overall rating for each airline as well as how each is rated in terms of entertainment options, comfort, food, crew/service, and boarding process.

Southwest

8.0

Very good

4,246 reviews

Reviews

1 / 20

8.0

Excellent

Gina,Jul 2025

LAS - DEN

We experienced bad weather, which turned our 1.5 hour flight from Las Vegas to Denver, into 3.5. The pilot and crew kept us updated and explained that we had to circle and or possibly redirect to another airport. After circling for sometime, we were able to land smoothly in Denver. Thank you to all the flight crew, tower control, and all who got us to our destination safely.

Southwest

8.0

Very good

4,246 reviews

Southwest

8.0

Very good

4,246 reviews

Reviews

1 / 20

8.0

Excellent

Gina,Jul 2025

LAS - DEN

Delta

8.0

Very good

7,981 reviews

Southwest

8.0

Very good

4,246 reviews

Reviews

1 / 20

8.0

Excellent

Gina,Jul 2025

LAS - DEN

United Airlines

7.4

Good

8,900 reviews

Southwest

8.0

Very good

4,246 reviews

Reviews

1 / 20

8.0

Excellent

Gina,Jul 2025

LAS - DEN

American Airlines

7.2

Good

10,000 reviews

Southwest

8.0

Very good

4,246 reviews

Reviews

1 / 20

8.0

Excellent

Gina,Jul 2025

LAS - DEN

Spirit Airlines

6.3

Okay

8,049 reviews

Southwest

8.0

Very good

4,246 reviews

Reviews

1 / 20

8.0

Excellent

Gina,Jul 2025

LAS - DEN

Related info for your journey

How popular is this Washington, D.C. to St. Charles flight route?
Flights from Washington, D.C. to St. Charles have been viewed 20 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 $91 on Spirit Airlines. Other airlines that offer cheap prices include Frontier from $99 and Southwest from $109 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, Baltimore/Washington - Lambert-St Louis or Washington, D.C. Reagan-National - 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 $288, our data shows the cheapest flight currently is $98. When looking at the most popular route, (Washington, D.C. Dulles Intl - Lambert-St Louis), you can expect to pay $209 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

Browse thousands of different options on Cheapflights for your next trip

Alternative routes for Washington, D.C. to St. Charles

Dulles Intl to Kansas City flights

Dulles Intl to St. Louis flights

Reagan-National to St. Louis flights

Reagan-National to Kansas City flights

Dulles Intl to Springfield flights

Reagan-National to Springfield flights

Dulles Intl to Columbia flights

Reagan-National to Columbia flights

Reagan-National to Joplin flights

Dulles Intl to Joplin flights

Dulles Intl to Kirksville flights

Dulles Intl to Fort Leonard Wood flights

Reagan-National to Branson flights

Reagan-National to Fort Leonard Wood flights

Dulles Intl to Branson flights

Complete your trip

Lambert-St Louis Airport car rentals

Columbia Regional Airport car rentals

Springfield Capital Airport car rentals

Belleville Airport car rentals

Quincy Regional Airport car rentals

St. Louis car rentals

Kansas City car rentals

Springfield car rentals

Columbia car rentals

Joplin car rentals

Fort Leonard Wood car rentals

Top 5 airlines flying from Washington, D.C. to St. Charles

Airline	Cheapest	Average	Flexibility	On-time
Frontier	Cheapest$109	Average$175	FlexibilityNo cancel fee	On-time62%
Delta	Cheapest$141	Average$279	FlexibilityNo cancel fee	On-timeN/A
American Airlines	Cheapest$158	Average$435	FlexibilityNo cancel fee	On-time71%
Southwest	Cheapest$189	Average$346	FlexibilityNo cancel fee	On-time63%
United Airlines	Cheapest$254	Average$477	FlexibilityNo cancel fee	On-time69%

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$86+ 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 8/27. Fares are subject to change and may not be available on all flights or dates of travel.

Find cheap flights from Washington, D.C. to St. Charles with Cheapflights

1. Tell us where you want to go

2. Select your favorite providers

3. Compare prices and book

Cheapflights Tip: The best prices from Washington, D.C. to St. Charles are usually found in August or May, 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

Keep the following information in mind while searching for Washington, D.C. to St. Charles flight deals. Data was last updated July 31, 2025.

Round-trip from

One-way from

Popular in

Cheapest in

Average price

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

Cheapest flights from Washington, D.C. to St. CharlesExplore 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 July 31, 2025.

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 July 31, 2025.

Cheapflights Fare Finder

Use the filters below to find and compare flights from Washington, D.C. to St. Charles that are best for you.

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.

Cheapflights Insights

Everything you need to know about your flight from Washington, D.C. to St. Charles

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 July 25, 2025.

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

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 July 31, 2025.

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.

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

Reviews of airlines servicing St. Charles

Read reviews from past customers who have flown Southwest, Delta, and United Airlines from Washington, D.C. to St. Charles. Users can see the overall rating for each airline as well as how each is rated in terms of entertainment options, comfort, food, crew/service, and boarding process.

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.

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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 July 31, 2025.