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 $189. Other airlines that can offer you cheap pricing are Delta, from $199, and Frontier, from $265. These flights start at 52% 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 ($90), Delta ($99), and American Airlines ($135).

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.

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).

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 $403, our data indicates the cheapest price to be $189. The most popular route (Washington, D.C. Dulles Intl - Lambert-St Louis), is priced around $189.

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

Consider GoJet (75%), Avianca (74%) or Copa Airlines (74%) 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 63% 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 $327. You can even find prices in August for less than $327, as users have found deals to St. Louis from as low as $148. 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 14%.

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.

$90+ Flights from Washington, D.C. Dulles Intl Airport to St. Louis

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1. Tell us where you want to go

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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 July or May, 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	$189 (United Airlines)
One-way from	$90 (United Airlines)
Popular in	December
Cheapest in	July
Average price	$299
Good round-trip deal	$291 or less
Good one-way deal	$304 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

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Highest demand for flights based on searches. 13% potential increase in price ($60 potential increase over avg. RT price).

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Cheapest flight prices on average. 2% potential price decrease ($10 potential savings vs. average RT price).

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Average for round-trip flights in July 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 July 21, 2025.

Tue 8/126:35 amIAD - STL

1 stop6h 52mUnited Airlines

Wed 8/138:15 amSTL - IAD

Nonstop2h 08mUnited Airlines

Deal found 7/21

$189

Tue 8/126:00 amIAD - STL

1 stop4h 32mDelta

Thu 8/145:11 pmSTL - IAD

1 stop6h 10mDelta

Deal found 7/21

$199

Wed 7/307:30 amIAD - STL

1 stop31h 12mFrontier

Sat 8/22:52 pmSTL - IAD

1 stop7h 27mFrontier

Deal found 7/20

$265

Sat 9/67:17 pmIAD - STL

1 stop4h 50mAmerican Airlines

Mon 9/83:59 pmSTL - IAD

1 stop17h 58mAmerican Airlines

Deal found 7/19

$277

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 July 21, 2025.

Sat 9/68:40 amIAD - STL

Nonstop2h 22mUnited Airlines

Mon 9/85:30 pmSTL - IAD

1 stop6h 02mUnited Airlines

Deal found 7/19

$189

Thu 8/146:00 amIAD - STL

1 stop4h 57mDelta

Mon 8/187:00 amSTL - IAD

1 stop6h 31mDelta

Deal found 7/20

$199

Wed 7/307:30 amIAD - STL

1 stop31h 12mFrontier

Sat 8/22:52 pmSTL - IAD

1 stop7h 27mFrontier

Deal found 7/20

$265

Sat 9/67:17 pmIAD - STL

1 stop4h 50mAmerican Airlines

Mon 9/83:59 pmSTL - IAD

1 stop17h 58mAmerican Airlines

Deal found 7/19

$277

Last-minute flights from Dulles Intl to St. Louis
Discover last-minute flight deals from Dulles Intl to St. Louis. Data last updated July 21, 2025 and is based on user searches.

Wed 7/307:30 amIAD - STL

1 stop31h 12mFrontier

Sat 8/22:52 pmSTL - IAD

1 stop7h 27mFrontier

Deal found 7/20

$265

Wed 7/3010:14 amIAD - STL

1 stop7h 04mDelta

Sun 8/39:27 amSTL - IAD

1 stop5h 58mDelta

Deal found 7/20

$568

Thu 7/3111:58 amIAD - STL

2 stops7h 43mMultiple Airlines

Sun 8/35:26 pmSTL - IAD

2 stops19h 57mMultiple Airlines

Deal found 7/19

$380

Thu 7/316:35 amIAD - STL

1 stop13h 39mAmerican Airlines

Tue 8/59:09 amSTL - IAD

1 stop13h 49mAmerican Airlines

Deal found 7/20

$494

Thu 7/318:40 amIAD - STL

Nonstop2h 19mUnited Airlines

Mon 8/41:04 pmSTL - IAD

Nonstop2h 08mUnited Airlines

Deal found 7/19

$548

Tue 8/127:44 amIAD - STL

1 stop7h 07mAmerican Airlines

Wed 8/136:06 amSTL - IAD

2 stops11h 46mAmerican Airlines

Deal found 7/21

$286

Thu 8/146:00 amIAD - STL

1 stop4h 57mDelta

Mon 8/187:00 amSTL - IAD

1 stop6h 31mDelta

Deal found 7/20

$199

Thu 8/146:35 amIAD - STL

1 stop6h 52mUnited Airlines

Tue 8/198:15 amSTL - IAD

Nonstop2h 10mUnited Airlines

Deal found 7/20

$211

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 July 21, 2025.

Wed 9/38:40 amIAD - STL

Nonstop2h 22mUnited Airlines

Deal found 7/21

$90

Mon 10/67:50 pmIAD - STL

1 stop4h 49mDelta

Deal found 7/20

$99

Mon 9/87:21 pmIAD - STL

1 stop4h 46mAmerican Airlines

Deal found 7/19

$135

Fri 10/106:00 amIAD - STL

1 stop5h 07mFrontier

Deal found 7/19

$137

Thu 8/214:56 pmIAD - STL

3 stops21h 36mMultiple Airlines

Deal found 7/19

$146

Fri 9/57:35 amIAD - STL

2 stops12h 00mSouthwest

Deal found 7/21

$179

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

Tue 8/12

6:35 am-12:27 pm

1 stop6h 52m

Lambert-St Louis

Wed 8/13

8:15 am-11:23 am

Nonstop2h 08m

$189

Washington, D.C.St. Louis

IAD - STL

IADSTL

Washington, D.C. Dulles Intl

Tue 8/12

6:00 am-9:32 am

1 stop4h 32m

Lambert-St Louis

Thu 8/14

5:11 pm-12:21 am

1 stop6h 10m

$199

Washington, D.C.St. Louis

IAD - STL

IADSTL

Washington, D.C. Dulles Intl

Wed 7/30

7:30 am-1:42 pm

1 stop31h 12m

Lambert-St Louis

Sat 8/2

2:52 pm-11:19 pm

1 stop7h 27m

$265

Washington, D.C.St. Louis

IAD - STL

IADSTL

Washington, D.C. Dulles Intl

Sat 9/6

7:17 pm-11:07 pm

1 stop4h 50m

Lambert-St Louis

Mon 9/8

3:59 pm-10:57 am

1 stop17h 58m

$277

Washington, D.C.St. Louis

IAD - STL

IADSTL

Washington, D.C. Dulles Intl

Wed 9/3

8:40 am-10:02 am

Nonstop2h 22m

$90

Washington, D.C.St. Louis

IAD - STL

IADSTL

Washington, D.C. Dulles Intl

Mon 10/6

7:50 pm-11:39 pm

1 stop4h 49m

$99

Washington, D.C.St. Louis

IAD - STL

IADSTL

Washington, D.C. Dulles Intl

Mon 9/8

7:21 pm-11:07 pm

1 stop4h 46m

$135

Washington, D.C.St. Louis

IAD - STL

IADSTL

Washington, D.C. Dulles Intl

Fri 10/10

6:00 am-10:07 am

1 stop5h 07m

$137

Washington, D.C.St. Louis

IAD - STL

IADSTL

Washington, D.C. Dulles Intl

Thu 8/21

4:56 pm-1:32 pm

3 stops21h 36m

$146

Washington, D.C.St. Louis

IAD - STL

IADSTL

Washington, D.C. Dulles Intl

Fri 9/5

7:35 am-6:35 pm

2 stops12h 00m

$179

Flights are sorted by cheapest round-trip flights first.

Deals found on 7/21

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 43% 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 (8 on average). You will have fewer flight options on Monday, which is when the least amount of flights are scheduled (8 on average).

Reviews of airlines servicing St. Louis

Get a feel of what it's like to fly with Southwest, Delta, and United Airlines from Washington, D.C. Dulles Intl Airport to St. Louis by reading reviews from past customers. Users have also rated airlines in terms of entertainment options, comfort, food, crew/service, and boarding process.

Southwest

8.0

Very good

4,232 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

4,232 reviews

Southwest

8.0

Very good

4,232 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

7,962 reviews

Southwest

8.0

Very good

4,232 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

8,868 reviews

Southwest

8.0

Very good

4,232 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

4,232 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

3,244 reviews

Southwest

8.0

Very good

4,232 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 $189. Other airlines that can offer you cheap pricing are Delta, from $199, and Frontier, from $265. These flights start at 52% 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 ($90), Delta ($99), and American Airlines ($135).
What are the most reliable airlines from Washington, D.C. Dulles Intl Airport to St. Louis?
Consider GoJet (75%), Avianca (74%) or Copa Airlines (74%) 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 $403, our data indicates the cheapest price to be $189. The most popular route (Washington, D.C. Dulles Intl - Lambert-St Louis), is priced around $189.
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$207	Average$307	FlexibilityNo cancel fee	On-timeN/A
American Airlines	Cheapest$214	Average$321	FlexibilityNo cancel fee	On-time71%
United Airlines	Cheapest$257	Average$479	FlexibilityNo cancel fee	On-time69%

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$90+ 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 9/3. 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 July or May, 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 July 21, 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 July 21, 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 July 18, 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 July 21, 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 July 20, 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 July 21, 2025.

Reviews of airlines servicing St. Louis

Get a feel of what it's like to fly with Southwest, Delta, and United Airlines from Washington, D.C. Dulles Intl Airport to St. Louis by reading reviews from past customers. 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 St. Louis?

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Alternative routes for Dulles Intl to St. Louis

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Top 3 airlines flying from 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 July 21, 2025.