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 Delta, from $217, and Frontier, from $219. These flights start at 48% 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 Southwest ($114), United Airlines ($115), and Delta ($123).

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 $424, our data indicates the cheapest price to be $181. The most popular route (Washington, D.C. Dulles Intl - Lambert-St Louis), is priced around $199.

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

Consider GoJet (78%), Avianca (78%) or Copa Airlines (78%) 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 Tuesday can be a cost-effective option. It’s possible to save up to 44% 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 $331. You can even find prices in August for less than $331, as users have found deals to St. Louis from as low as $169. 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 12%.

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.

$114+ Flights from Washington, D.C. Dulles Intl Airport to St. Louis

Home Search by date Vacation packages Hotels Flight deals Car rental Travel tips & news

Find cheap flights from Dulles Intl to St. Louis 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. Dulles Intl to Lambert-St Louis are usually found in May or February, booked 70 days in advance, depart on a Wednesday or Sunday and return on a Friday

Cheap flight deals from Dulles Intl to St. Louis

Round-trip from	$211 (United Airlines)
One-way from	$114 (Southwest)
Popular in	December
Cheapest in	May
Average price	$440
Good round-trip deal	$443 or less
Good one-way deal	$305 or less

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

Search Deals

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

Search Deals

Highest demand for flights based on searches. 11% potential increase in price ($50 potential increase over avg. RT price).

Search Deals

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

Search Deals

Average for round-trip flights in June 2025

Search Deals

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

Search Deals

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

Search Deals

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 juin 18, 2025.

jeu. 8/218:40 amIAD - STL

Nonstop2h 22mUnited Airlines

sam. 8/238:15 amSTL - IAD

Nonstop2h 10mUnited Airlines

Deal found 6/16

$211

mer. 8/1312:39 pmIAD - STL

1 stop4h 27mDelta

jeu. 8/216:49 pmSTL - IAD

1 stop4h 32mDelta

Deal found 6/17

$217

sam. 6/216:10 amIAD - STL

1 stop8h 57mFrontier

dim. 6/228:44 pmSTL - IAD

1 stop12h 25mFrontier

Deal found 6/16

$219

sam. 10/252:06 pmIAD - STL

1 stop4h 14mAmerican Airlines

lun. 10/277:00 pmSTL - IAD

1 stop4h 02mAmerican Airlines

Deal found 6/16

$254

jeu. 7/3111:58 amIAD - STL

2 stops7h 43mMultiple Airlines

dim. 8/35:26 pmSTL - IAD

2 stops19h 57mMultiple Airlines

Deal found 6/17

$326

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 juin 18, 2025.

jeu. 8/218:40 amIAD - STL

Nonstop2h 22mUnited Airlines

sam. 8/238:15 amSTL - IAD

Nonstop2h 10mUnited Airlines

Deal found 6/16

$211

mer. 8/136:00 amIAD - STL

1 stop4h 57mDelta

mer. 8/209:17 amSTL - IAD

1 stop4h 14mDelta

Deal found 6/17

$217

sam. 6/216:10 amIAD - STL

1 stop8h 57mFrontier

dim. 6/228:44 pmSTL - IAD

1 stop12h 25mFrontier

Deal found 6/16

$219

lun. 8/257:25 pmIAD - STL

1 stop4h 40mAmerican Airlines

mar. 8/263:43 pmSTL - IAD

1 stop6h 13mAmerican Airlines

Deal found 6/18

$254

jeu. 7/3111:58 amIAD - STL

2 stops7h 43mMultiple Airlines

dim. 8/35:26 pmSTL - IAD

2 stops19h 57mMultiple Airlines

Deal found 6/17

$326

Last-minute flights from Dulles Intl to St. Louis
Discover last-minute flight deals from Dulles Intl to St. Louis. Data last updated juin 18, 2025 and is based on user searches.

sam. 6/216:10 amIAD - STL

1 stop8h 57mFrontier

dim. 6/228:44 pmSTL - IAD

1 stop12h 25mFrontier

Deal found 6/16

$219

lun. 6/236:55 amIAD - STL

1 stop6h 04mAmerican Airlines

lun. 6/304:37 pmSTL - IAD

1 stop6h 22mAmerican Airlines

Deal found 6/16

$409

jeu. 6/266:35 amIAD - STL

1 stop6h 52mUnited Airlines

mar. 7/16:33 amSTL - IAD

1 stop4h 22mUnited Airlines

Deal found 6/17

$374

jeu. 6/2611:52 amIAD - STL

2 stops7h 49mMultiple Airlines

dim. 6/296:12 amSTL - IAD

2 stops26h 11mMultiple Airlines

Deal found 6/16

$420

ven. 6/276:00 amIAD - STL

1 stop4h 37mDelta

mar. 7/16:00 amSTL - IAD

1 stop4h 53mDelta

Deal found 6/17

$414

sam. 6/286:10 amIAD - STL

1 stop8h 57mFrontier

mer. 7/25:47 pmSTL - IAD

1 stop17h 57mFrontier

Deal found 6/17

$312

mar. 7/16:00 amIAD - STL

1 stop4h 15mDelta

mar. 7/15:23 pmSTL - IAD

1 stop4h 51mDelta

Deal found 6/18

$217

mar. 7/85:13 pmIAD - STL

1 stop6h 32mUnited Airlines

mer. 7/98:15 amSTL - IAD

Nonstop2h 08mUnited Airlines

Deal found 6/17

$239

jeu. 7/108:06 pmIAD - STL

1 stop4h 53mAmerican Airlines

lun. 7/144:28 pmSTL - IAD

1 stop6h 30mAmerican Airlines

Deal found 6/18

$317

jeu. 7/3111:58 amIAD - STL

2 stops7h 43mMultiple Airlines

dim. 8/35:26 pmSTL - IAD

2 stops19h 57mMultiple Airlines

Deal found 6/17

$326

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 juin 18, 2025.

lun. 8/257:35 amIAD - STL

1 stop13h 10mSouthwest

Deal found 6/17

$114

sam. 9/138:40 amIAD - STL

Nonstop2h 22mUnited Airlines

Deal found 6/16

$115

sam. 8/163:26 pmIAD - STL

1 stop4h 41mDelta

Deal found 6/16

$123

dim. 8/311:58 amIAD - STL

2 stops7h 43mMultiple Airlines

Deal found 6/17

$132

sam. 8/96:34 amIAD - STL

1 stop6h 37mAmerican Airlines

Deal found 6/17

$143

dim. 7/206:10 amIAD - STL

1 stop8h 24mFrontier

Deal found 6/16

$162

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

jeu. 8/21

8:40 am-10:02 am

Nonstop2h 22m

Lambert-St Louis

sam. 8/23

8:15 am-11:25 am

Nonstop2h 10m

$211

Washington, D.C.St. Louis

IAD - STL

IADSTL

Washington, D.C. Dulles Intl

mer. 8/13

6:00 am-9:57 am

1 stop4h 57m

Lambert-St Louis

mer. 8/20

9:17 am-2:31 pm

1 stop4h 14m

$217

Washington, D.C.St. Louis

IAD - STL

IADSTL

Washington, D.C. Dulles Intl

sam. 6/21

6:10 am-2:07 pm

1 stop8h 57m

Lambert-St Louis

dim. 6/22

8:44 pm-10:09 am

1 stop12h 25m

$219

Washington, D.C.St. Louis

IAD - STL

IADSTL

Washington, D.C. Dulles Intl

lun. 8/25

7:25 pm-11:05 pm

1 stop4h 40m

Lambert-St Louis

mar. 8/26

3:43 pm-10:56 pm

1 stop6h 13m

$254

Washington, D.C.St. Louis

IAD - STL

IADSTL

Washington, D.C. Dulles Intl

jeu. 7/31

11:58 am-6:41 pm

2 stops7h 43m

Lambert-St Louis

dim. 8/3

5:26 pm-2:23 pm

2 stops19h 57m

$326

Washington, D.C.St. Louis

IAD - STL

IADSTL

Washington, D.C. Dulles Intl

lun. 8/25

7:35 am-7:45 pm

1 stop13h 10m

$114

Washington, D.C.St. Louis

IAD - STL

IADSTL

Washington, D.C. Dulles Intl

dim. 8/17

8:40 am-9:59 am

Nonstop2h 19m

$115

Washington, D.C.St. Louis

IAD - STL

IADSTL

Washington, D.C. Dulles Intl

sam. 8/16

3:26 pm-7:07 pm

1 stop4h 41m

$123

Washington, D.C.St. Louis

IAD - STL

IADSTL

Washington, D.C. Dulles Intl

dim. 8/3

11:58 am-6:41 pm

2 stops7h 43m

$132

Washington, D.C.St. Louis

IAD - STL

IADSTL

Washington, D.C. Dulles Intl

sam. 8/9

6:34 am-12:11 pm

1 stop6h 37m

$143

Flights are sorted by cheapest round-trip flights first.

Deals found on 6/17

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 69 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 41% 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 Thursday, 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

4,280 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

4,280 reviews

Southwest

8.0

Very good

4,280 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

7,964 reviews

Southwest

8.0

Very good

4,280 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

8,810 reviews

Southwest

8.0

Very good

4,280 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

4,280 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

5.9

Fair

3,301 reviews

Southwest

8.0

Very good

4,280 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 Delta, from $217, and Frontier, from $219. These flights start at 48% 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 Southwest ($114), United Airlines ($115), and Delta ($123).
What are the most reliable airlines from Washington, D.C. Dulles Intl Airport to St. Louis?
Consider GoJet (78%), Avianca (78%) or Copa Airlines (78%) 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 $424, our data indicates the cheapest price to be $181. The most popular route (Washington, D.C. Dulles Intl - Lambert-St Louis), is priced around $199.
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

O'Fallon

Maryland Heights

Fairview Heights

Collinsville

Eureka

St. Peters

Glencoe

Festus

Alton

Farmington

Browse thousands of different options on Cheapflights for your next trip

Alternative routes for Dulles Intl to St. Louis

Complete your trip

St. Louis car rentals

Lambert-St Louis Airport car rentals

Springfield Capital Airport car rentals

Belleville Airport car rentals

Marion Williamson County Airport car rentals

Kansas City car rentals

Springfield car rentals

Columbia car rentals

Joplin car rentals

Fort Leonard Wood car rentals

Downtown car rentals

The Hill car rentals

Other flights to St. Louis

Detroit to St. Louis flights

Minneapolis to St. Louis flights

Denver to St. Louis flights

Fort Lauderdale to St. Louis flights

Atlanta to St. Louis flights

Dallas/Fort Worth to St. Louis flights

St. Louis to Little Rock flights

St. Louis to Orlando Airport flights

St. Louis to Detroit Metropolitan Wayne County Airport flights

St. Louis to Quincy, Illinois flights

St. Louis to Denver flights

St. Louis to Chicago Midway Airport flights

St. Louis to Fort Lauderdale flights

St. Louis to Tampa flights

St. Louis to Las Vegas flights

St. Louis to Jonesboro, Arkansas flights

St. Louis to Washington, D.C. Reagan-National Airport flights

St. Louis to Dallas/Fort Worth Airport flights

St. Louis to Minneapolis flights

St. Louis to Quincy, Illinois flights

St. Louis to Chicago Midway Airport flights

St. Louis to Atlanta flights

St. Louis to Fort Lauderdale flights

Top 3 airlines flying from Dulles Intl to St. Louis

Airline	Cheapest	Average	Flexibility	On-time
Delta	Cheapest$202	Average$308	FlexibilityNo cancel fee	On-timeN/A
American Airlines	Cheapest$214	Average$322	FlexibilityNo cancel fee	On-time71%
United Airlines	Cheapest$259	Average$478	FlexibilityNo cancel fee	On-time69%

100% Free

Cheapflights is completely free to use, so you can start saving the moment you arrive.

Book with Flexibility

Our users can plan ahead with confidence and find flights with no change fees

Travel Smart

Millions of people come to us for their flight needs every year. We help make travel planning easy by providing useful insights and data-driven graphs that can inform your decisions.

$114+ 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 8/25. 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 May or February, booked 70 days in advance, depart on a Wednesday or Sunday 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 juin 18, 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 juin 18, 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 June 13, 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 juin 18, 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 15, 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 juin 18, 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

See prices for flight routes from nearby airports that may be better suited for you.

Top 3 airlines flying from Dulles Intl to St. Louis

100% Free

Book with Flexibility

Travel Smart

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 juin 18, 2025.