How long is the flight from Washington, D.C. to St. Charles?

For as low as $262, Frontier can have you in St. Charles from Washington, D.C. in 2h 32m. The distance between Washington, D.C. and St. Charles is about 694 mi. Both multi-stop and nonstop flights can be found to your destination and back.

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 $58 on Frontier. Other airlines that offer cheap prices include American Airlines from $98 and Southwest from $98 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 $405, our data shows the cheapest flight currently is $66. When looking at the most popular route, (Washington, D.C. Dulles Intl - Lambert-St Louis), you can expect to pay $231 for that flight.

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 (72%), Avianca (72%) or Copa Airlines (72%) as they are the most reliable in getting you off to your destination on time.

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 Southwest, American Airlines or United Airlines as they are the most popular for this route.

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.

$62+ Flights from Washington, D.C. to St. Charles

Q: How much does it cost to fly round-trip from Washington, D.C. to St. Charles?

Airfare is below average for this route at the moment. Washington, D.C. to St. Charles flights typically cost between $312 and $493 in January. The cheapest round-trip price found within the last 3 days was $130 on Multiple Airlines (Jan 13-Jan 20).

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Cheapflights Tip: The best prices from Washington, D.C. to St. Charles are usually found in August or October, booked 63 days in advance, depart on a Saturday or Tuesday and return on a Friday

Cheap 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 December 16, 2025.

Tue 12/305:30 amBWI - STL

1 stop5h 10mFrontier

Wed 1/75:11 pmSTL - BWI

1 stop17h 56mFrontier

Deal found 12/15

$214

Thu 12/255:50 pmIAD - STL

Nonstop2h 32mUnited Airlines

Thu 1/18:15 amSTL - IAD

Nonstop2h 09mUnited Airlines

Deal found 12/13

$262

Mon 12/2910:00 pmBWI - STL

1 stop25h 33mFrontier

Wed 12/314:27 pmSTL - BWI

1 stop13h 55mFrontier

Deal found 12/15

$284

Mon 12/2910:00 pmBWI - STL

1 stop25h 33mFrontier

Thu 1/14:27 pmSTL - BWI

1 stop13h 55mFrontier

Deal found 12/15

$293

Tue 12/306:00 pmDCA - STL

1 stop17h 02mFrontier

Wed 1/77:43 pmSTL - DCA

1 stop20h 16mFrontier

Deal found 12/15

$293

Mon 12/299:58 pmIAD - STL

1 stop25h 35mFrontier

Thu 1/110:42 amSTL - IAD

1 stop6h 34mFrontier

Deal found 12/16

$294

Tue 12/308:15 pmIAD - STL

2 stops38h 25mFrontier

Sun 1/115:11 pmSTL - IAD

1 stop13h 29mFrontier

Deal found 12/15

$296

Thu 12/189:41 amIAD - STL

1 stop23h 31mFrontier

Sun 12/2110:57 amSTL - IAD

1 stop5h 01mFrontier

Deal found 12/13

$297

Thu 12/189:41 amIAD - STL

1 stop23h 31mFrontier

Mon 12/229:07 amSTL - IAD

1 stop23h 21mFrontier

Deal found 12/16

$298

Thu 12/256:10 pmDCA - STL

Nonstop2h 25mSouthwest

Mon 1/58:30 amSTL - DCA

Nonstop1h 55mSouthwest

Deal found 12/14

$305

Thu 12/255:50 pmIAD - STL

Nonstop2h 32mUnited Airlines

Wed 12/316:35 pmSTL - IAD

1 stop4h 40mUnited Airlines

Deal found 12/16

$307

Sun 12/285:30 amBWI - STL

1 stop5h 10mFrontier

Mon 12/294:27 pmSTL - BWI

1 stop13h 55mFrontier

Deal found 12/15

$308

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 December 16, 2025.

Mon 1/121:02 pmBWI - STL

1 stop10h 31mFrontier

Mon 1/198:32 pmSTL - BWI

1 stop26h 49mFrontier

Deal found 12/13

$207

Mon 1/191:54 pmBWI - STL

1 stop9h 40mMultiple Airlines

Mon 1/268:22 pmSTL - BWI

2 stops26h 25mMultiple Airlines

Deal found 12/16

$249

Tue 1/133:35 pmDCA - STL

1 stop4h 25mSouthwest

Wed 1/146:20 amSTL - DCA

2 stops8h 05mSouthwest

Deal found 12/15

$260

Thu 12/255:50 pmIAD - STL

Nonstop2h 32mUnited Airlines

Thu 1/18:15 amSTL - IAD

Nonstop2h 09mUnited Airlines

Deal found 12/13

$262

Thu 1/159:35 amDCA - STL

1 stop4h 28mAmerican Airlines

Sun 1/189:54 amSTL - DCA

Nonstop2h 05mAmerican Airlines

Deal found 12/16

$271

Tue 1/136:15 pmIAD - STL

1 stop6h 24mDelta

Thu 1/156:35 amSTL - IAD

1 stop4h 14mDelta

Deal found 12/14

$285

Thu 1/85:35 amBWI - STL

1 stop10h 13mFrontier

Mon 1/128:50 amSTL - BWI

1 stop12h 54mFrontier

Deal found 12/13

$213

Wed 1/1411:00 amDCA - STL

2 stops7h 05mSouthwest

Wed 1/216:00 amSTL - DCA

2 stops7h 15mSouthwest

Deal found 12/15

$265

Fri 1/165:17 pmIAD - STL

1 stop6h 41mUnited Airlines

Sun 1/186:30 amSTL - IAD

1 stop4h 16mUnited Airlines

Deal found 12/15

$292

Thu 1/154:25 pmDCA - STL

2 stops8h 10mSouthwest

Sun 1/186:00 pmSTL - DCA

Nonstop2h 00mSouthwest

Deal found 12/16

$276

Thu 1/296:00 amIAD - STL

1 stop4h 39mDelta

Thu 2/56:57 pmSTL - IAD

1 stop4h 27mDelta

Deal found 12/15

$315

Thu 1/158:20 amIAD - STL

1 stop5h 09mUnited Airlines

Thu 1/2212:44 pmSTL - IAD

Nonstop2h 11mUnited Airlines

Deal found 12/16

$305

Tue 1/69:05 amIAD - STL

1 stop9h 25mSouthwest

Mon 1/1212:25 pmSTL - IAD

1 stop8h 30mSouthwest

Deal found 12/15

$293

Tue 1/66:20 amIAD - STL

1 stop5h 45mDelta

Sun 1/116:35 amSTL - IAD

1 stop4h 14mDelta

Deal found 12/13

$329

Thu 2/196:00 amIAD - STL

1 stop5h 58mUnited Airlines

Mon 2/238:30 amSTL - IAD

Nonstop2h 10mUnited Airlines

Deal found 12/15

$305

Sun 12/215:30 amBWI - STL

1 stop5h 10mFrontier

Thu 1/14:27 pmSTL - BWI

1 stop13h 55mFrontier

Deal found 12/14

$342

Thu 1/89:05 amIAD - STL

1 stop9h 25mSouthwest

Tue 1/132:35 pmSTL - IAD

1 stop6h 20mSouthwest

Deal found 12/15

$296

Wed 1/75:50 pmIAD - STL

Nonstop2h 37mUnited Airlines

Sun 1/119:57 amSTL - IAD

1 stop5h 03mUnited Airlines

Deal found 12/14

$319

Sat 12/204:49 pmBWI - STL

1 stop5h 54mDelta

Tue 12/307:02 pmSTL - BWI

1 stop4h 41mDelta

Deal found 12/16

$355

Fri 2/2012:30 pmDCA - STL

Nonstop2h 30mSouthwest

Mon 2/237:35 pmSTL - DCA

Nonstop1h 55mSouthwest

Deal found 12/14

$306

Thu 1/88:40 amIAD - STL

Nonstop2h 33mUnited Airlines

Tue 1/138:05 amSTL - IAD

1 stop6h 55mUnited Airlines

Deal found 12/15

$319

Thu 2/263:05 pmDCA - STL

Nonstop2h 35mSouthwest

Fri 2/273:25 pmSTL - DCA

Nonstop1h 55mSouthwest

Deal found 12/16

$306

Fri 1/308:40 amIAD - STL

Nonstop2h 33mUnited Airlines

Sun 2/18:30 amSTL - IAD

Nonstop2h 10mUnited Airlines

Deal found 12/14

$339

Wed 1/77:15 amBWI - STL

1 stop7h 35mSouthwest

Sat 1/104:25 pmSTL - BWI

Nonstop2h 00mSouthwest

Deal found 12/13

$317

Thu 12/256:10 pmDCA - STL

Nonstop2h 25mSouthwest

Mon 1/59:50 amSTL - DCA

2 stops7h 10mSouthwest

Deal found 12/14

$320

Thu 1/159:05 pmBWI - STL

Nonstop2h 35mSouthwest

Thu 1/226:50 amSTL - BWI

Nonstop2h 00mSouthwest

Deal found 12/16

$333

Thu 1/225:30 pmBWI - STL

Nonstop2h 30mSouthwest

Mon 1/262:35 pmSTL - BWI

Nonstop1h 55mSouthwest

Deal found 12/13

$335

Mon 1/125:30 pmBWI - STL

Nonstop2h 30mSouthwest

Mon 1/195:05 amSTL - BWI

Nonstop2h 00mSouthwest

Deal found 12/13

$335

Sat 2/711:15 amBWI - STL

Nonstop2h 35mSouthwest

Mon 2/92:55 pmSTL - BWI

1 stop4h 05mSouthwest

Deal found 12/14

$341

Wed 1/73:35 pmBWI - STL

1 stop4h 10mSouthwest

Sun 1/115:05 amSTL - BWI

Nonstop2h 00mSouthwest

Deal found 12/14

$362

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 December 16, 2025 and is based on user searches.

Thu 12/255:50 pmIAD - STL

Nonstop2h 32mUnited Airlines

Thu 1/18:15 amSTL - IAD

Nonstop2h 09mUnited Airlines

Deal found 12/13

$262

Sun 1/45:30 amBWI - STL

1 stop5h 10mFrontier

Mon 1/54:27 pmSTL - BWI

1 stop28h 36mFrontier

Deal found 12/16

$164

Mon 1/510:00 pmBWI - STL

1 stop25h 33mFrontier

Wed 1/75:11 pmSTL - BWI

1 stop22h 19mFrontier

Deal found 12/16

$163

Wed 1/78:00 amBWI - STL

1 stop15h 33mMultiple Airlines

Sun 1/115:11 pmSTL - BWI

1 stop17h 06mMultiple Airlines

Deal found 12/14

$158

Wed 1/711:00 amDCA - STL

2 stops7h 05mSouthwest

Sat 1/107:40 amSTL - DCA

1 stop4h 40mSouthwest

Deal found 12/13

$260

Sat 1/104:44 pmBWI - STL

1 stop6h 49mMultiple Airlines

Sun 1/115:11 pmSTL - BWI

1 stop17h 56mMultiple Airlines

Deal found 12/15

$172

Sun 1/111:02 pmBWI - STL

1 stop20h 03mFrontier

Mon 1/125:11 pmSTL - BWI

1 stop28h 25mFrontier

Deal found 12/15

$142

Tue 1/136:05 amBWI - STL

1 stop25h 46mMultiple Airlines

Tue 1/205:42 pmSTL - BWI

1 stop29h 05mMultiple Airlines

Deal found 12/14

$130

Thu 1/226:00 amBWI - STL

2 stops18h 33mFrontier

Mon 1/268:22 pmSTL - BWI

1 stop26h 59mFrontier

Deal found 12/15

$159

Fri 1/234:44 pmBWI - STL

1 stop7h 49mMultiple Airlines

Mon 1/268:22 pmSTL - BWI

1 stop26h 59mMultiple Airlines

Deal found 12/15

$143

Thu 1/291:22 pmBWI - STL

1 stop11h 11mFrontier

Sat 1/3111:00 amSTL - BWI

1 stop6h 50mFrontier

Deal found 12/15

$145

Fri 1/308:00 amDCA - STL

1 stop11h 44mFrontier

Sun 2/19:32 pmSTL - DCA

2 stops18h 27mFrontier

Deal found 12/15

$261

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 December 16, 2025.

Fri 1/1610:08 pmIAD - STL

1 stop9h 43mFrontier

Deal found 12/15

$62

Wed 1/78:00 amBWI - STL

1 stop15h 33mFrontier

Deal found 12/15

$62

Wed 2/118:00 amDCA - STL

1 stop8h 53mFrontier

Deal found 12/16

$63

Thu 1/86:00 amIAD - STL

1 stop9h 48mFrontier

Deal found 12/14

$64

Sat 2/76:15 pmBWI - STL

1 stop6h 18mFrontier

Deal found 12/16

$64

Sat 1/248:00 amDCA - STL

1 stop7h 46mFrontier

Deal found 12/16

$64

Tue 2/311:30 amBWI - STL

1 stop13h 03mMultiple Airlines

Deal found 12/15

$65

Tue 3/35:58 pmBWI - STL

1 stop13h 53mFrontier

Deal found 12/16

$67

Tue 1/2011:00 amIAD - STL

1 stop20h 51mFrontier

Deal found 12/15

$68

Tue 1/136:05 amBWI - STL

1 stop25h 46mFrontier

Deal found 12/16

$68

Tue 1/132:00 pmDCA - STL

1 stop25h 48mFrontier

Deal found 12/16

$68

Sun 1/186:00 amIAD - STL

1 stop25h 51mFrontier

Deal found 12/16

$69

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

Most accurate provider	eDreams 3 stars
Most trusted provider	eDreams 3 stars
Round-trip from	$130 (Kiwi.com)
One-way from	$62 (Trip.com)
Popular in	December
Cheapest in	August
Average price	$388

Provider with most accurate pricing for Washington, D.C. (WAS)-Lambert-St Louis flight deals.

Search Deals

Provider most trusted by Cheapflights users for Washington, D.C. (WAS)-Lambert-St Louis flights.

Search Deals

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 ($36 potential increase over avg. RT price).

Search Deals

Cheapest flight prices on average. 1% potential price decrease ($6 potential savings vs. average RT price).

Search Deals

Average for round-trip flights in December 2025

Search Deals

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

Mon 1/12

1:02 pm-10:33 pm

1 stop10h 31m

Lambert-St Louis

Mon 1/19

8:32 pm-12:21 am

1 stop26h 49m

$207

BaltimoreSt. Louis

BWI - STL

BWISTL

Baltimore/Washington

Thu 1/8

5:35 am-2:48 pm

1 stop10h 13m

Lambert-St Louis

Mon 1/12

8:50 am-10:44 pm

1 stop12h 54m

$213

BaltimoreSt. Louis

BWI - STL

BWISTL

Baltimore/Washington

Mon 1/19

1:54 pm-10:34 pm

1 stop9h 40m

Lambert-St Louis

Mon 1/26

8:22 pm-11:47 pm

2 stops26h 25m

$249

Washington, D.C.St. Louis

DCA - STL

DCASTL

Washington, D.C. Reagan-National

Tue 1/13

3:35 pm-7:00 pm

1 stop4h 25m

Lambert-St Louis

Wed 1/14

6:20 am-3:25 pm

2 stops8h 05m

$260

Washington, D.C.St. Louis

IAD - STL

IADSTL

Washington, D.C. Dulles Intl

Thu 12/25

5:50 pm-7:22 pm

Nonstop2h 32m

Lambert-St Louis

Thu 1/1

8:15 am-11:24 am

Nonstop2h 09m

$262

Washington, D.C.St. Louis

DCA - STL

DCASTL

Washington, D.C. Reagan-National

Wed 1/14

11:00 am-5:05 pm

2 stops7h 05m

Lambert-St Louis

Wed 1/21

6:00 am-2:15 pm

2 stops7h 15m

$265

Washington, D.C.St. Louis

DCA - STL

DCASTL

Washington, D.C. Reagan-National

Thu 1/15

9:35 am-1:03 pm

1 stop4h 28m

Lambert-St Louis

Sun 1/18

9:54 am-12:59 pm

Nonstop2h 05m

$271

Washington, D.C.St. Louis

DCA - STL

DCASTL

Washington, D.C. Reagan-National

Thu 1/15

4:25 pm-11:35 pm

2 stops8h 10m

Lambert-St Louis

Sun 1/18

6:00 pm-9:00 pm

Nonstop2h 00m

$276

Washington, D.C.St. Louis

IAD - STL

IADSTL

Washington, D.C. Dulles Intl

Tue 1/13

6:15 pm-11:39 pm

1 stop6h 24m

Lambert-St Louis

Thu 1/15

6:35 am-11:49 am

1 stop4h 14m

$285

Washington, D.C.St. Louis

IAD - STL

IADSTL

Washington, D.C. Dulles Intl

Fri 1/16

5:17 pm-10:58 pm

1 stop6h 41m

Lambert-St Louis

Sun 1/18

6:30 am-11:46 am

1 stop4h 16m

$292

Flights are sorted by cheapest round-trip flights first.

Deals found on 12/16

Showing 1-10 of 60 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 63 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, September is the cheapest month in which you can book a flight from Washington, D.C. to St. Charles (average of $109). Flying from Washington, D.C. to St. Charles in January is currently the most expensive (average of $222). 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?

It’s optimal to fly from Washington, D.C. to St. Charles in the evening. By choosing this option you can save up to 44% on the cost of your flight, compared to a flight in the afternoon.

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 Tuesday 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.

How much does it cost to fly round-trip 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.

Southwest

7.9

Good

4,250 reviews

Reviews

1 / 20

2.0

Mediocre

Thomas,Dec 2025

SEA - DEN

Plane two hours late in leaving 1:00 pm west coat time got home next day at 2:45am most car rental places are closed and don’t open till 5am

Southwest

7.9

Good

4,250 reviews

Southwest

7.9

Good

4,250 reviews

Reviews

1 / 20

2.0

Mediocre

Thomas,Dec 2025

SEA - DEN

Plane two hours late in leaving 1:00 pm west coat time got home next day at 2:45am most car rental places are closed and don’t open till 5am

Delta

7.9

Good

8,008 reviews

Southwest

7.9

Good

4,250 reviews

Reviews

1 / 20

2.0

Mediocre

Thomas,Dec 2025

SEA - DEN

Plane two hours late in leaving 1:00 pm west coat time got home next day at 2:45am most car rental places are closed and don’t open till 5am

United Airlines

7.4

Good

9,092 reviews

Southwest

7.9

Good

4,250 reviews

Reviews

1 / 20

2.0

Mediocre

Thomas,Dec 2025

SEA - DEN

Plane two hours late in leaving 1:00 pm west coat time got home next day at 2:45am most car rental places are closed and don’t open till 5am

American Airlines

7.2

Good

11,049 reviews

Southwest

7.9

Good

4,250 reviews

Reviews

1 / 20

2.0

Mediocre

Thomas,Dec 2025

SEA - DEN

Plane two hours late in leaving 1:00 pm west coat time got home next day at 2:45am most car rental places are closed and don’t open till 5am

Frontier

5.8

Fair

3,082 reviews

Southwest

7.9

Good

4,250 reviews

Reviews

1 / 20

2.0

Mediocre

Thomas,Dec 2025

SEA - DEN

Plane two hours late in leaving 1:00 pm west coat time got home next day at 2:45am most car rental places are closed and don’t open till 5am

Related info for your journey

How long is the flight from Washington, D.C. to St. Charles?
For as low as $262, Frontier can have you in St. Charles from Washington, D.C. in 2h 32m. The distance between Washington, D.C. and St. Charles is about 694 mi. Both multi-stop and nonstop flights can be found to your destination and back.
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 $58 on Frontier. Other airlines that offer cheap prices include American Airlines from $98 and Southwest from $98 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 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 (72%), Avianca (72%) or Copa Airlines (72%) 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 $405, our data shows the cheapest flight currently is $66. When looking at the most popular route, (Washington, D.C. Dulles Intl - Lambert-St Louis), you can expect to pay $231 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, September is the cheapest month in which you can book a flight from Washington, D.C. to St. Charles (average of $109). Flying from Washington, D.C. to St. Charles in January is currently the most expensive (average of $222). 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.

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

Airline	Cheapest	Average	Flexibility	On-time
Frontier	Cheapest$78	Average$198	FlexibilityNo cancel fee	On-time62%
Delta	Cheapest$130	Average$279	FlexibilityNo cancel fee	On-timeN/A
American Airlines	Cheapest$172	Average$386	FlexibilityNo cancel fee	On-time71%
Southwest	Cheapest$187	Average$353	FlexibilityNo cancel fee	On-time63%
United Airlines	Cheapest$223	Average$396	FlexibilityNo cancel fee	On-time69%

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$62+ 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 1/16. Fares are subject to change and may not be available on all flights or dates of travel.

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Cheapflights Tip: The best prices from Washington, D.C. to St. Charles are usually found in August or October, booked 63 days in advance, depart on a Saturday or Tuesday and return on a Friday

Cheap 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 December 16, 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 December 16, 2025.

Find 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 December 16, 2025.

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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.

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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 December 12, 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 December 16, 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.

How much does it cost to fly round-trip 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.

How long is the flight from Washington, D.C. to St. Charles?

What are the cheapest airlines to fly from Washington, D.C. to St. Charles one-way?

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

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

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Top 5 airlines flying from 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 December 16, 2025.