What are the cheapest airlines flying from Washington, D.C. Dulles Intl Airport to St. Louis round-trip?

Cheapflights users have booked flights from Washington, D.C. Dulles Intl Airport to St. Louis round-trip from $211. Other airlines that can offer you cheap pricing are Frontier, from $212, and Delta, from $224. These flights start at 49% lower than the current average price 3 months from now.

What are the cheapest airlines to fly from Washington, D.C. Dulles Intl Airport to St. Louis one-way?

The cheapest airlines for a one-way flight from Washington, D.C. Dulles Intl Airport to St. Louis are United Airlines ($115), Frontier ($116), and Delta ($125).

What are the cheapest flights from Washington, D.C. Dulles Intl Airport to St. Louis?

Looking for the cheapest flight from Washington, D.C. Dulles Intl Airport to St. Louis? While on average our users pay $378, our data indicates the cheapest price to be $193. The most popular route (Washington, D.C. Dulles Intl - Lambert-St Louis), is priced around $175.

What are the most reliable airlines from Washington, D.C. Dulles Intl Airport to St. Louis?

Consider GoJet (82%), Avianca (82%) or Copa Airlines (82%) when booking your flight. These represent the most reliable airlines when flying from Washington, D.C. Dulles Intl Airport to St. Louis.

What are the most popular airlines that fly from Washington, D.C. Dulles Intl Airport to St. Louis?

American Airlines, Delta and United Airlines are the most popular airlines when flying from Washington, D.C. Dulles Intl Airport to St. Louis.

What is the cheapest day to fly round-trip from Washington, D.C. Dulles Intl Airport to St. Louis?

Users have found that leaving on a Saturday can be a cost-effective option. It’s possible to save up to 45% on your flight compared to booking on days when demand is much higher.

What is the cheapest month to fly from Washington, D.C. Dulles Intl Airport to St. Louis?

The best pricing can be found in the month of August. Prices to St. Louis from Washington, D.C. Dulles Intl Airport average $328. You can even find prices in August for less than $328, as users have found deals to St. Louis from as low as $177. The month of March appears to be one of the more expensive times to travel to St. Louis from Washington, D.C. Dulles Intl Airport. Flying in the targeted month can save you up to 13%.

What airport do you fly into for flights to St. Louis from Washington, D.C. Dulles Intl?

If you book a flight to St. Louis from Washington, D.C. Dulles Intl, you will be flying to Lambert-St Louis, which is the city’s only airport. Lambert-St Louis (STL) is located 12.7 mi from the center of St. Louis. There are 8 flights from Washington, D.C. Dulles Intl to Lambert-St Louis per day from 3 different airlines.

Can I find deals for flights from Dulles Intl to St. Louis that include hotel bookings?

Yes. In addition to deals on Dulles Intl to St. Louis flights, Cheapflights offers vacation packages that include both flights and hotel.

How can I find direct flights from Dulles Intl to St. Louis?

After entering your origin and destination, apply the non-stop filter on the search result page to find direct flights from Dulles Intl to St. Louis.

Can I find deals for business class flights from Dulles Intl to St. Louis?

Yes. Cheapflights offers flight deals from Dulles Intl to St. Louis by cabin class. In addition to browsing deals, you can also filter by cabin class on the search results page after making a search.

$115+ Flights from Washington, D.C. Dulles Intl Airport to St. Louis

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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”

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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

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Cheapflights Tip: The best prices from Washington, D.C. Dulles Intl to Lambert-St Louis are usually found in February or July, booked 53 days in advance, depart on a Sunday or Wednesday and return on a Friday

Cheap flight deals from Dulles Intl to St. Louis

Round-trip from	$211 (United Airlines)
One-way from	$115 (United Airlines)
Popular in	December
Cheapest in	February
Average price	$396
Good round-trip deal	$345 or less
Good one-way deal	$219 or less

From Washington, D.C. Dulles Intl to Lambert-St Louis

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One-way flight from Washington, D.C. Dulles Intl to Lambert-St Louis

Search Deals

Highest demand for flights based on searches. 10% potential increase in price ($48 potential increase over avg. RT price).

Search Deals

Cheapest flight prices on average. 1% potential price decrease ($8 potential savings vs. average RT price).

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Average for round-trip flights in June 2025

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Price to beat on a round-trip flight from Washington, D.C. Dulles Intl to Lambert-St Louis.

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Price to beat on a one-way flight from Washington, D.C. Dulles Intl to Lambert-St Louis.

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Find flight deals from Dulles Intl to St. Louis

Cheapest flights from Dulles Intl to St. Louis
Explore the most affordable flight options available from Dulles Intl to St. Louis. Find the lowest fares from popular airlines and budget airlines, with prices last updated on June 5, 2025.

Thu 6/126:10 amIAD - STL

1 stop8h 30mFrontier

Sun 6/158:44 pmSTL - IAD

1 stop12h 25mFrontier

Deal found 6/5

$212

Thu 6/266:00 amIAD - STL

1 stop4h 43mDelta

Mon 6/305:23 pmSTL - IAD

1 stop4h 51mDelta

Deal found 6/4

$224

Sat 9/276:30 amIAD - STL

1 stop5h 19mUnited Airlines

Sun 9/285:28 pmSTL - IAD

1 stop5h 53mUnited Airlines

Deal found 6/4

$227

Tue 8/2611:51 amIAD - STL

1 stop9h 31mAmerican Airlines

Wed 8/276:06 amSTL - IAD

2 stops11h 46mAmerican Airlines

Deal found 6/4

$291

Fri 7/254:46 pmIAD - STL

2 stops22h 53mMultiple Airlines

Sat 8/29:50 amSTL - IAD

2 stops10h 08mMultiple Airlines

Deal found 6/3

$292

Best flights from Dulles Intl to St. Louis
Discover carefully curated flight deals from Dulles Intl to St. Louis that have cost, travel time, and layovers in mind to ensure you get the best travel experience. Data last updated June 5, 2025.

Tue 8/198:40 amIAD - STL

Nonstop2h 22mUnited Airlines

Fri 8/228:15 amSTL - IAD

Nonstop2h 10mUnited Airlines

Deal found 6/5

$211

Thu 6/126:10 amIAD - STL

1 stop8h 30mFrontier

Thu 6/128:44 pmSTL - IAD

1 stop12h 25mFrontier

Deal found 6/4

$212

Thu 6/266:00 amIAD - STL

1 stop4h 43mDelta

Mon 6/304:10 pmSTL - IAD

1 stop6h 04mDelta

Deal found 6/4

$224

Tue 8/266:27 amIAD - STL

1 stop11h 20mAmerican Airlines

Wed 8/276:06 amSTL - IAD

2 stops11h 46mAmerican Airlines

Deal found 6/5

$291

Fri 7/254:46 pmIAD - STL

2 stops22h 53mMultiple Airlines

Sat 8/29:50 amSTL - IAD

2 stops10h 08mMultiple Airlines

Deal found 6/3

$292

Last-minute flights from Dulles Intl to St. Louis
Discover last-minute flight deals from Dulles Intl to St. Louis. Data last updated June 5, 2025 and is based on user searches.

Wed 6/119:40 amIAD - STL

1 stop4h 46mDelta

Tue 6/1710:48 amSTL - IAD

1 stop4h 45mDelta

Deal found 6/3

$504

Wed 6/119:00 amIAD - STL

1 stop16h 04mAlaska Airlines

Wed 6/187:32 pmSTL - IAD

1 stop27h 27mAlaska Airlines

Deal found 6/4

$1,019

Thu 6/126:10 amIAD - STL

1 stop8h 30mFrontier

Sun 6/158:44 pmSTL - IAD

1 stop12h 25mFrontier

Deal found 6/5

$212

Thu 6/1211:52 amIAD - STL

2 stops7h 49mMultiple Airlines

Mon 6/1611:28 amSTL - IAD

3 stops22h 58mMultiple Airlines

Deal found 6/3

$470

Fri 6/136:55 amIAD - STL

1 stop6h 04mAmerican Airlines

Tue 6/174:41 pmSTL - IAD

1 stop6h 18mAmerican Airlines

Deal found 6/3

$469

Sun 6/158:40 amIAD - STL

Nonstop2h 16mUnited Airlines

Tue 6/241:00 pmSTL - IAD

Nonstop2h 08mUnited Airlines

Deal found 6/2

$448

Thu 6/266:00 amIAD - STL

1 stop4h 43mDelta

Mon 6/304:10 pmSTL - IAD

1 stop6h 04mDelta

Deal found 6/4

$224

Fri 6/276:35 amIAD - STL

1 stop6h 52mUnited Airlines

Sat 7/58:15 amSTL - IAD

Nonstop2h 08mUnited Airlines

Deal found 6/3

$239

Fri 7/254:46 pmIAD - STL

2 stops22h 53mMultiple Airlines

Sat 8/29:50 amSTL - IAD

2 stops10h 08mMultiple Airlines

Deal found 6/3

$292

Wed 7/308:06 pmIAD - STL

1 stop4h 53mAmerican Airlines

Sun 8/37:30 amSTL - IAD

1 stop4h 19mAmerican Airlines

Deal found 6/4

$297

One-way flights from Dulles Intl to St. Louis
Search for one-way flight options from Dulles Intl to St. Louis. Find affordable one-way fares based on user searches. Data last updated June 5, 2025.

Thu 7/108:40 amIAD - STL

Nonstop2h 19mUnited Airlines

Deal found 6/5

$115

Sat 7/266:10 amIAD - STL

1 stop8h 49mFrontier

Deal found 6/5

$116

Wed 7/96:00 amIAD - STL

1 stop4h 33mDelta

Deal found 6/4

$125

Thu 8/1411:04 amIAD - STL

2 stops21h 45mMultiple Airlines

Deal found 6/5

$129

Mon 7/215:39 pmIAD - STL

1 stop7h 20mAmerican Airlines

Deal found 6/5

$149

Tue 7/297:25 amIAD - STL

2 stops12h 30mSouthwest

Deal found 6/4

$159

Cheapflights Fare Finder

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

Fly from

Fly to

Route

Depart

Return

Price

Washington, D.C.St. Louis

IAD - STL

IADSTL

Washington, D.C. Dulles Intl

Thu 6/12

6:10 am-1:40 pm

1 stop8h 30m

Lambert-St Louis

Sun 6/15

8:44 pm-10:09 am

1 stop12h 25m

$212

Washington, D.C.St. Louis

IAD - STL

IADSTL

Washington, D.C. Dulles Intl

Thu 6/26

6:00 am-9:43 am

1 stop4h 43m

Lambert-St Louis

Mon 6/30

4:10 pm-11:14 pm

1 stop6h 04m

$224

Washington, D.C.St. Louis

IAD - STL

IADSTL

Washington, D.C. Dulles Intl

Tue 7/29

6:35 am-12:27 pm

1 stop6h 52m

Lambert-St Louis

Tue 8/5

8:15 am-11:23 am

Nonstop2h 08m

$234

Washington, D.C.St. Louis

IAD - STL

IADSTL

Washington, D.C. Dulles Intl

Tue 8/26

11:51 am-8:22 pm

1 stop9h 31m

Lambert-St Louis

Wed 8/27

6:06 am-6:52 pm

2 stops11h 46m

$291

Washington, D.C.St. Louis

IAD - STL

IADSTL

Washington, D.C. Dulles Intl

Fri 7/25

4:46 pm-2:39 pm

2 stops22h 53m

Lambert-St Louis

Sat 8/2

9:50 am-8:58 pm

2 stops10h 08m

$292

Washington, D.C.St. Louis

IAD - STL

IADSTL

Washington, D.C. Dulles Intl

Sun 7/20

8:40 am-9:59 am

Nonstop2h 19m

$115

Washington, D.C.St. Louis

IAD - STL

IADSTL

Washington, D.C. Dulles Intl

Sat 7/12

6:10 am-1:59 pm

1 stop8h 49m

$116

Washington, D.C.St. Louis

IAD - STL

IADSTL

Washington, D.C. Dulles Intl

Mon 8/18

7:35 am-6:35 pm

2 stops12h 00m

$123

Washington, D.C.St. Louis

IAD - STL

IADSTL

Washington, D.C. Dulles Intl

Tue 7/8

10:14 am-4:18 pm

1 stop7h 04m

$125

Washington, D.C.St. Louis

IAD - STL

IADSTL

Washington, D.C. Dulles Intl

Mon 6/30

6:55 am-11:59 am

1 stop6h 04m

$135

Flights are sorted by cheapest round-trip flights first.

Deals found on 6/4

Showing 1-10 of 11 results

The best insider tips for Washington, D.C. Dulles Intl Airport to St. Louis flights

Cheapflights partnered with top experts to bring you the best recommendations for your Washington, D.C. Dulles Intl Airport to St. Louis trip

Airports

IAD

For quick check-in at IAD, locate your airline’s counter by walking around the first row. Counters are like an island with desks on both sides.

STL

Use the MetroLink light rail for a convenient, economical ride from STL to downtown St. Louis. It takes about 40 minutes and avoids traffic.

Our travel experts

Taryn White

Expert on STL

Ramsey Qubein

Expert on IAD

Best time to book a flight from Dulles Intl to St. Louis

Have a flexible travel schedule? Discover the best time to fly to St. Louis from Dulles Intl 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. Dulles Intl Airport to St. Louis

How far ahead should I book a flight from Washington, D.C. Dulles Intl Airport to St. Louis?

The best time to book flights from Washington, D.C. Dulles Intl Airport to St. Louis is 53 days before your desired departure date. The cost of your flight will likely increase significantly if you book two weeks in advance of your flight.

What is the cheapest month to book a flight from Washington, D.C. Dulles Intl Airport to St. Louis?

Currently, August is the cheapest month in which you can book a flight from Washington, D.C. Dulles Intl Airport to St. Louis (average of $311). Flying from Washington, D.C. Dulles Intl Airport to St. Louis 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 IAD to STL?

It’s typically best to fly out from Washington, D.C. Dulles Intl Airport to St. Louis in the evening. Doing so could potentially save you 40% on the flight price compared to flying in the afternoon, which is usually more expensive.

What is the cheapest day to fly from Washington, D.C. Dulles Intl Airport to St. Louis?

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

Weekly flight availability from Washington, D.C. Dulles Intl Airport to St. Louis

The most flights from IAD to STL are scheduled on a Monday (9 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. Louis by month

In terms of precipitation, rainfall in St. Louis 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. Louis when rainfall is around 2.2 in.

Temperature in St. Louis by month

If weather is an important factor for your trip to St. Louis, 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. Louis

Read reviews from past customers who have flown Southwest, Delta and United Airlines from Washington, D.C. to St. Louis. In addition to providing an overall rating, users have also rated airlines in terms of entertainment options, comfort, food, crew/service, and boarding process.

Southwest

8.0

Very good

4,288 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

4,288 reviews

Southwest

8.0

Very good

4,288 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

7,958 reviews

Southwest

8.0

Very good

4,288 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

8,774 reviews

Southwest

8.0

Very good

4,288 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

4,288 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.

Frontier

6.0

Okay

3,291 reviews

Southwest

8.0

Very good

4,288 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

What airport do you fly into for flights to St. Louis from Washington, D.C. Dulles Intl?
If you book a flight to St. Louis from Washington, D.C. Dulles Intl, you will be flying to Lambert-St Louis, which is the city’s only airport. Lambert-St Louis (STL) is located 12.7 mi from the center of St. Louis. There are 8 flights from Washington, D.C. Dulles Intl to Lambert-St Louis per day from 3 different airlines.
What are the cheapest airlines flying from Washington, D.C. Dulles Intl Airport to St. Louis round-trip?
Cheapflights users have booked flights from Washington, D.C. Dulles Intl Airport to St. Louis round-trip from $211. Other airlines that can offer you cheap pricing are Frontier, from $212, and Delta, from $224. These flights start at 49% lower than the current average price 3 months from now.
What are the cheapest airlines to fly from Washington, D.C. Dulles Intl Airport to St. Louis one-way?
The cheapest airlines for a one-way flight from Washington, D.C. Dulles Intl Airport to St. Louis are United Airlines ($115), Frontier ($116), and Delta ($125).
What are the most reliable airlines from Washington, D.C. Dulles Intl Airport to St. Louis?
Consider GoJet (82%), Avianca (82%) or Copa Airlines (82%) when booking your flight. These represent the most reliable airlines when flying from Washington, D.C. Dulles Intl Airport to St. Louis.
What are the cheapest flights from Washington, D.C. Dulles Intl Airport to St. Louis?
Looking for the cheapest flight from Washington, D.C. Dulles Intl Airport to St. Louis? While on average our users pay $378, our data indicates the cheapest price to be $193. The most popular route (Washington, D.C. Dulles Intl - Lambert-St Louis), is priced around $175.
Can I find deals for flights from Dulles Intl to St. Louis that include hotel bookings?
Yes. In addition to deals on Dulles Intl to St. Louis flights, Cheapflights offers vacation packages that include both flights and hotel.
How can I find direct flights from Dulles Intl to St. Louis?
After entering your origin and destination, apply the non-stop filter on the search result page to find direct flights from Dulles Intl to St. Louis.
Can I find deals for business class flights from Dulles Intl to St. Louis?
Yes. Cheapflights offers flight deals from Dulles Intl to St. Louis 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. Dulles Intl Airport to St. Louis?
Currently, August is the cheapest month in which you can book a flight from Washington, D.C. Dulles Intl Airport to St. Louis (average of $311). Flying from Washington, D.C. Dulles Intl Airport to St. Louis 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 3 airlines flying from Dulles Intl to St. Louis

Airline	Cheapest	Average	Flexibility	On-time
Delta	Cheapest$198	Average$308	FlexibilityNo cancel fee	On-timeN/A
American Airlines	Cheapest$214	Average$322	FlexibilityNo cancel fee	On-time71%
United Airlines	Cheapest$258	Average$478	FlexibilityNo cancel fee	On-time69%

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$115+ Cheap flights from Dulles Intl (IAD) to St. Louis (STL)

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 7/10. Fares are subject to change and may not be available on all flights or dates of travel.

Find cheap flights from Dulles Intl to St. Louis 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. Dulles Intl to Lambert-St Louis are usually found in February or July, booked 53 days in advance, depart on a Sunday or Wednesday and return on a Friday

Cheap flight deals from Dulles Intl to St. Louis

Round-trip from

One-way from

Popular in

Cheapest in

Average price

Good round-trip deal

Good one-way deal

Find flight deals from Dulles Intl to St. Louis

Cheapest flights from Dulles Intl to St. LouisExplore the most affordable flight options available from Dulles Intl to St. Louis. Find the lowest fares from popular airlines and budget airlines, with prices last updated on June 5, 2025.

Explore the most affordable flight options available from Dulles Intl to St. Louis. Find the lowest fares from popular airlines and budget airlines, with prices last updated on June 5, 2025.

Cheapflights Fare Finder

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

The best insider tips for Washington, D.C. Dulles Intl Airport to St. Louis flights

Cheapflights partnered with top experts to bring you the best recommendations for your Washington, D.C. Dulles Intl Airport to St. Louis trip

Airports

IAD

STL

Our travel experts

Best time to book a flight from Dulles Intl to St. Louis

Have a flexible travel schedule? Discover the best time to fly to St. Louis from Dulles Intl with our price prediction graph.

Cheapflights Insights

Everything you need to know about your flight from Washington, D.C. Dulles Intl Airport to St. Louis

How far ahead should I book a flight from Washington, D.C. Dulles Intl Airport to St. Louis?

Use this chart to determine the optimal time to book a round-trip flight from Dulles Intl to St. Louis. Price data was last updated on May 23, 2025.

What is the cheapest month to book a flight from Washington, D.C. Dulles Intl Airport to St. Louis?

What is the cheapest time of day to fly from IAD to STL?

Find hourly flight availability from Dulles Intl to St. Louis. Discover flight options and departure times throughout the day, allowing you to choose a departure time that suits your schedule. Data last updated June 5, 2025.

What is the cheapest day to fly from Washington, D.C. Dulles Intl Airport to St. Louis?

Use this chart to determine the cheapest time to fly round-trip from Dulles Intl to St. Louis. Price data was last updated on June 1, 2025.

Weekly flight availability from Washington, D.C. Dulles Intl Airport to St. Louis

Explore weekly flight availability from Dulles Intl to St. Louis. 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 June 5, 2025.

Rainfall in St. Louis by month

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

Temperature in St. Louis by month

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

Reviews of airlines servicing St. Louis

Read reviews from past customers who have flown Southwest, Delta and United Airlines from Washington, D.C. to St. Louis. In addition to providing an overall rating, 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 Dulles Intl to St. Louis. Access travel guides, tips, and recommendations to enhance your travel experience. Get information about local attractions, weather, transportation options, and more.

What airport do you fly into for flights to St. Louis from Washington, D.C. Dulles Intl?

What are the cheapest airlines flying from Washington, D.C. Dulles Intl Airport to St. Louis round-trip?

What are the cheapest airlines to fly from Washington, D.C. Dulles Intl Airport to St. Louis one-way?

What are the most reliable airlines from Washington, D.C. Dulles Intl Airport to St. Louis?

What are the cheapest flights from Washington, D.C. Dulles Intl Airport to St. Louis?

Can I find deals for flights from Dulles Intl to St. Louis that include hotel bookings?

How can I find direct flights from Dulles Intl to St. Louis?

Can I find deals for business class flights from Dulles Intl to St. Louis?

What is the cheapest month to book a flight from Washington, D.C. Dulles Intl Airport to St. Louis?

Traveling to a place near Washington, D.C. Dulles Intl Airport?

Browse thousands of different options on Cheapflights for your next trip

Toggle through the tabs below to find thousands of options on Cheapflights for your next trip.

Alternative routes for Dulles Intl to St. Louis

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Cheapest flights from Dulles Intl to St. Louis
Explore the most affordable flight options available from Dulles Intl to St. Louis. Find the lowest fares from popular airlines and budget airlines, with prices last updated on June 5, 2025.