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

Flights from Washington, D.C. to St. Charles have been viewed 13 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 $63 on Spirit Airlines. Other airlines that offer cheap prices include Southwest from $99 and United Airlines 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 $298, 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 $177 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 $414 1-2 weeks out and tickets from $620 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 $332. You can even find prices in August for less than $332, as users have found deals to St. Charles from as low as $169. 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 12%.

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.

$63+ 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	$140 (Mytrip)
One-way from	$63 (FlightHub)
Popular in	March
Cheapest in	August
Average price	$340

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. 6% potential increase in price ($22 potential increase over avg. RT price).

Search Deals

Cheapest flight prices on average. 1% potential price decrease ($5 potential savings vs. average RT price).

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Average for round-trip flights in June 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 June 12, 2025.

Thu 7/102:50 pmBWI - STL

1 stop20h 02mSpirit Airlines

Sun 7/1310:47 amSTL - BWI

1 stop19h 52mSpirit Airlines

Deal found 6/11

$140

Fri 7/42:59 pmDCA - STL

Nonstop2h 29mAmerican Airlines

Tue 7/86:00 amSTL - DCA

Nonstop2h 10mAmerican Airlines

Deal found 6/10

$206

Sat 9/276:10 amIAD - STL

1 stop4h 25mDelta

Mon 9/295:40 pmSTL - IAD

1 stop5h 27mDelta

Deal found 6/11

$208

Sat 9/610:11 amDCA - STL

1 stop5h 17mDelta

Mon 9/85:11 pmSTL - DCA

1 stop5h 35mDelta

Deal found 6/12

$208

Wed 7/306:35 amIAD - STL

1 stop6h 52mUnited Airlines

Wed 8/66:33 amSTL - IAD

1 stop4h 22mUnited Airlines

Deal found 6/10

$213

Wed 7/308:30 amDCA - STL

1 stop4h 57mUnited Airlines

Wed 8/65:00 amSTL - DCA

1 stop4h 56mUnited Airlines

Deal found 6/10

$213

Mon 6/306:35 pmDCA - STL

Nonstop2h 15mSouthwest

Wed 7/25:45 pmSTL - DCA

1 stop5h 05mSouthwest

Deal found 6/10

$214

Tue 8/267:58 amBWI - STL

1 stop6h 53mAmerican Airlines

Wed 8/276:06 amSTL - BWI

1 stop4h 46mAmerican Airlines

Deal found 6/11

$217

Sat 7/266:10 amIAD - STL

1 stop8h 49mFrontier

Sat 8/22:52 pmSTL - IAD

1 stop7h 27mFrontier

Deal found 6/11

$221

Sat 7/267:20 amBWI - STL

1 stop7h 39mFrontier

Sat 8/22:52 pmSTL - BWI

1 stop8h 03mFrontier

Deal found 6/11

$221

Thu 7/102:50 pmBWI - STL

1 stop20h 02mMultiple Airlines

Mon 7/145:40 pmSTL - BWI

1 stop21h 06mMultiple Airlines

Deal found 6/10

$226

Wed 7/305:40 pmBWI - STL

1 stop4h 20mSouthwest

Mon 8/45:05 pmSTL - BWI

Nonstop2h 00mSouthwest

Deal found 6/11

$247

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 June 12, 2025.

Thu 7/102:50 pmBWI - STL

1 stop20h 02mSpirit Airlines

Sun 7/1310:47 amSTL - BWI

1 stop19h 52mSpirit Airlines

Deal found 6/11

$140

Fri 7/42:59 pmDCA - STL

Nonstop2h 29mAmerican Airlines

Tue 7/86:00 amSTL - DCA

Nonstop2h 10mAmerican Airlines

Deal found 6/10

$206

Sat 9/68:00 amDCA - STL

1 stop5h 31mDelta

Mon 9/85:11 pmSTL - DCA

1 stop5h 35mDelta

Deal found 6/10

$208

Wed 7/306:35 amIAD - STL

1 stop6h 52mUnited Airlines

Wed 8/66:33 amSTL - IAD

1 stop4h 22mUnited Airlines

Deal found 6/10

$213

Mon 6/306:35 pmDCA - STL

Nonstop2h 15mSouthwest

Wed 7/25:45 pmSTL - DCA

1 stop5h 05mSouthwest

Deal found 6/10

$214

Sat 7/266:10 amIAD - STL

1 stop8h 49mFrontier

Sat 8/22:52 pmSTL - IAD

1 stop7h 27mFrontier

Deal found 6/11

$221

Wed 7/28:36 pmBWI - STL

1 stop23h 48mMultiple Airlines

Sun 7/1310:47 amSTL - BWI

1 stop19h 52mMultiple Airlines

Deal found 6/10

$263

Wed 7/308:30 amDCA - STL

1 stop4h 57mUnited Airlines

Wed 8/65:00 amSTL - DCA

1 stop4h 56mUnited Airlines

Deal found 6/10

$213

Tue 8/267:58 amBWI - STL

1 stop6h 53mAmerican Airlines

Wed 8/276:06 amSTL - BWI

1 stop4h 46mAmerican Airlines

Deal found 6/11

$217

Sat 7/267:20 amBWI - STL

1 stop7h 39mFrontier

Sat 8/22:52 pmSTL - BWI

1 stop8h 03mFrontier

Deal found 6/11

$221

Wed 7/306:00 amIAD - STL

1 stop4h 33mDelta

Mon 8/43:41 pmSTL - IAD

1 stop5h 35mDelta

Deal found 6/11

$223

Wed 7/305:40 pmBWI - STL

1 stop4h 20mSouthwest

Mon 8/45:05 pmSTL - BWI

Nonstop2h 00mSouthwest

Deal found 6/10

$247

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 June 12, 2025 and is based on user searches.

Tue 6/177:00 amDCA - STL

1 stop27h 12mFrontier

Fri 6/207:29 pmSTL - DCA

1 stop15h 31mFrontier

Deal found 6/11

$389

Tue 6/178:14 pmIAD - STL

1 stop4h 45mAmerican Airlines

Tue 6/244:41 pmSTL - IAD

1 stop6h 18mAmerican Airlines

Deal found 6/10

$469

Thu 6/196:00 pmDCA - STL

1 stop5h 45mUnited Airlines

Wed 6/256:30 amSTL - DCA

1 stop4h 29mUnited Airlines

Deal found 6/10

$469

Fri 6/208:00 amDCA - STL

Nonstop2h 26mAmerican Airlines

Tue 7/16:00 amSTL - DCA

Nonstop2h 05mAmerican Airlines

Deal found 6/11

$354

Fri 6/205:20 pmBWI - STL

1 stop16h 52mMultiple Airlines

Sun 6/226:36 pmSTL - BWI

1 stop11h 28mMultiple Airlines

Deal found 6/10

$379

Fri 6/203:31 pmIAD - STL

1 stop7h 03mDelta

Tue 7/110:48 amSTL - IAD

1 stop4h 45mDelta

Deal found 6/11

$409

Fri 6/206:05 amDCA - STL

1 stop4h 32mDelta

Tue 7/15:23 pmSTL - DCA

1 stop5h 23mDelta

Deal found 6/11

$409

Sat 6/211:29 pmIAD - STL

1 stop11h 24mFrontier

Sun 6/228:44 pmSTL - IAD

1 stop12h 25mFrontier

Deal found 6/10

$282

Sat 6/217:20 amBWI - STL

1 stop7h 47mFrontier

Thu 6/262:36 pmSTL - BWI

1 stop8h 50mFrontier

Deal found 6/9

$325

Sat 6/218:40 amIAD - STL

Nonstop2h 16mUnited Airlines

Tue 6/248:15 amSTL - IAD

Nonstop2h 08mUnited Airlines

Deal found 6/9

$449

Sat 6/216:55 amDCA - STL

2 stops9h 10mSouthwest

Tue 6/247:40 amSTL - DCA

1 stop5h 40mSouthwest

Deal found 6/9

$509

Sun 6/222:08 pmBWI - STL

1 stop3h 56mSpirit Airlines

Mon 6/2311:28 amSTL - BWI

1 stop7h 05mSpirit Airlines

Deal found 6/10

$349

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 June 12, 2025.

Thu 9/410:46 pmBWI - STL

1 stop10h 03mSpirit Airlines

Deal found 6/10

$63

Thu 8/76:20 amBWI - STL

Nonstop2h 10mSouthwest

Deal found 6/10

$99

Tue 8/2610:51 amBWI - STL

1 stop5h 53mUnited Airlines

Deal found 6/10

$109

Wed 8/138:40 amIAD - STL

Nonstop2h 19mUnited Airlines

Deal found 6/10

$115

Thu 7/247:44 amDCA - STL

Nonstop2h 26mAmerican Airlines

Deal found 6/12

$115

Mon 9/110:30 amDCA - STL

1 stop6h 14mUnited Airlines

Deal found 6/10

$117

Fri 9/53:40 pmDCA - STL

1 stop4h 05mSouthwest

Deal found 6/11

$120

Sat 8/3012:23 pmBWI - STL

1 stop5h 13mDelta

Deal found 6/10

$121

Sat 8/96:34 amIAD - STL

1 stop6h 37mAmerican Airlines

Deal found 6/11

$126

Thu 8/1411:04 amIAD - STL

2 stops21h 45mMultiple Airlines

Deal found 6/10

$129

Tue 9/95:45 amIAD - STL

2 stops13h 05mSouthwest

Deal found 6/10

$135

Thu 7/106:00 amDCA - STL

1 stop4h 41mDelta

Deal found 6/10

$135

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

Thu 7/10

2:50 pm-9:52 am

1 stop20h 02m

Lambert-St Louis

Sun 7/13

10:47 am-7:39 am

1 stop19h 52m

$140

Washington, D.C.St. Louis

DCA - STL

DCASTL

Washington, D.C. Reagan-National

Fri 7/4

2:59 pm-4:28 pm

Nonstop2h 29m

Lambert-St Louis

Tue 7/8

6:00 am-9:10 am

Nonstop2h 10m

$206

Washington, D.C.St. Louis

IAD - STL

IADSTL

Washington, D.C. Dulles Intl

Sat 9/27

6:10 am-9:35 am

1 stop4h 25m

Lambert-St Louis

Mon 9/29

5:40 pm-12:07 am

1 stop5h 27m

$208

Washington, D.C.St. Louis

DCA - STL

DCASTL

Washington, D.C. Reagan-National

Sat 9/6

10:11 am-2:28 pm

1 stop5h 17m

Lambert-St Louis

Mon 9/8

5:11 pm-11:46 pm

1 stop5h 35m

$208

Washington, D.C.St. Louis

IAD - STL

IADSTL

Washington, D.C. Dulles Intl

Wed 7/30

6:35 am-12:27 pm

1 stop6h 52m

Lambert-St Louis

Wed 8/6

6:33 am-11:55 am

1 stop4h 22m

$213

Washington, D.C.St. Louis

DCA - STL

DCASTL

Washington, D.C. Reagan-National

Wed 7/30

8:30 am-12:27 pm

1 stop4h 57m

Lambert-St Louis

Wed 8/6

5:00 am-10:56 am

1 stop4h 56m

$213

Washington, D.C.St. Louis

DCA - STL

DCASTL

Washington, D.C. Reagan-National

Mon 6/30

6:35 pm-7:50 pm

Nonstop2h 15m

Lambert-St Louis

Wed 7/2

5:45 pm-11:50 pm

1 stop5h 05m

$214

BaltimoreSt. Louis

BWI - STL

BWISTL

Baltimore/Washington

Tue 8/26

7:58 am-1:51 pm

1 stop6h 53m

Lambert-St Louis

Wed 8/27

6:06 am-11:52 am

1 stop4h 46m

$217

Washington, D.C.St. Louis

IAD - STL

IADSTL

Washington, D.C. Dulles Intl

Sat 7/26

6:10 am-1:59 pm

1 stop8h 49m

Lambert-St Louis

Sat 8/2

2:52 pm-11:19 pm

1 stop7h 27m

$221

BaltimoreSt. Louis

BWI - STL

BWISTL

Baltimore/Washington

Sat 7/26

7:20 am-1:59 pm

1 stop7h 39m

Lambert-St Louis

Sat 8/2

2:52 pm-11:55 pm

1 stop8h 03m

$221

Flights are sorted by cheapest round-trip flights first.

Deals found on 6/10

Showing 1-10 of 36 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 Monday evenings when fares are most often at their lowest. Sunday 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

The most flights from WAS to CH5 are scheduled on a Monday (17 on average). You will have fewer flight options on Saturday, which is when the least amount of flights are scheduled (9 on average).

Rainfall in St. Charles 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

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

To help decide which airline to fly from Washington, D.C. to St. Charles, see what other customers have to say about Southwest, Delta and United Airlines. Users have also rated airlines in terms of entertainment options, comfort, food, crew/service, and boarding process.

Southwest

8.0

Very good

4,287 reviews

Reviews

1 / 20

8.0

Excellent

John,May 2025

PVD - BNA

It’s southwest so no frills but clean, efficient and got me to my location.

Southwest

8.0

Very good

4,287 reviews

Southwest

8.0

Very good

4,287 reviews

Reviews

1 / 20

8.0

Excellent

John,May 2025

PVD - BNA

It’s southwest so no frills but clean, efficient and got me to my location.

Delta

8.0

Very good

7,946 reviews

Southwest

8.0

Very good

4,287 reviews

Reviews

1 / 20

8.0

Excellent

John,May 2025

PVD - BNA

It’s southwest so no frills but clean, efficient and got me to my location.

United Airlines

7.4

Good

8,790 reviews

Southwest

8.0

Very good

4,287 reviews

Reviews

1 / 20

8.0

Excellent

John,May 2025

PVD - BNA

It’s southwest so no frills but clean, efficient and got me to my location.

American Airlines

7.2

Good

10,000 reviews

Southwest

8.0

Very good

4,287 reviews

Reviews

1 / 20

8.0

Excellent

John,May 2025

PVD - BNA

It’s southwest so no frills but clean, efficient and got me to my location.

Sun Country Air

6.9

Okay

345 reviews

Southwest

8.0

Very good

4,287 reviews

Reviews

1 / 20

8.0

Excellent

John,May 2025

PVD - BNA

It’s southwest so no frills but clean, efficient and got me to my location.

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 13 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 $63 on Spirit Airlines. Other airlines that offer cheap prices include Southwest from $99 and United Airlines 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 $298, 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 $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

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

Reagan-National to Columbia flights

Dulles Intl to Columbia flights

Reagan-National to Joplin flights

Dulles Intl to Joplin flights

Dulles Intl to Kirksville flights

Reagan-National to Branson flights

Reagan-National to Fort Leonard Wood flights

Dulles Intl to Branson flights

Dulles Intl to Fort Leonard Wood 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

Columbia car rentals

Springfield 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$108	Average$221	FlexibilityNo cancel fee	On-time62%
American Airlines	Cheapest$166	Average$429	FlexibilityNo cancel fee	On-time71%
Delta	Cheapest$169	Average$289	FlexibilityNo cancel fee	On-timeN/A
Southwest	Cheapest$197	Average$350	FlexibilityNo cancel fee	On-time63%
United Airlines	Cheapest$223	Average$400	FlexibilityNo cancel fee	On-time69%

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$63+ 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 9/4. 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 June 12, 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 June 12, 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 June 12, 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 June 9, 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 June 12, 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

Rainfall in St. Charles by month

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

Temperature in St. Charles by month

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

Reviews of airlines servicing St. Charles

To help decide which airline to fly from Washington, D.C. to St. Charles, see what other customers have to say about Southwest, Delta and United Airlines. Users have also rated airlines 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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What is the cheapest month to book a flight from Washington, D.C. to St. Charles?

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

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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 June 12, 2025.