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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 1/18. Fares are subject to change and may not be available on all flights or dates of travel.
IAD — STL
dic. 23 — dic. 301
lun. 12/23
lun. 12/30
1 adult, Economy
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The best prices from Washington, D.C. Dulles Intl to Lambert-St Louis are usually found in April or July, booked 54 days in advance, depart on a Wednesday or Sunday and return on a Tuesday

Cheap flight deals from Dulles Intl to St. Louis

Discover tips and strategies to find the most affordable flight options for your journey from Dulles Intl (IAD) to St. Louis (STL). Learn about various techniques such as flexible date searches, comparing prices across and setting up price alerts. Use these methods to find the cheapest flights available for your travel needs. Data last updated diciembre 18, 2024.

Most accurate provider

FlightHub
3 stars

Most trusted provider

FlightHub
3 stars

Round-trip from

$239
(United Airlines)

One-way from

$115
(United Airlines)

Popular in

January

Cheapest in

April

Average price

$464
Provider with most accurate pricing for Washington, D.C. Dulles Intl-Lambert-St Louis flight deals.
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Provider most trusted by Cheapflights users for Washington, D.C. Dulles Intl-Lambert-St Louis flights.
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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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High demand for flights, 8% potential price rise
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Best time to find cheap flights, 1% potential price drop
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Average for round-trip flights in December 2024
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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 diciembre 18, 2024.

This Delta deal was found by Cheapflights users on 12/17. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
mar. 12/2410:00 amIAD - STL
1 stop7h 12mDelta
mar. 1/215:00 pmSTL - IAD
1 stop6h 22mDelta
Deal found 12/17$428
This American Airlines deal was found by Cheapflights users on 12/16. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
lun. 12/305:00 amIAD - STL
1 stop4h 50mAmerican Airlines
jue. 1/25:58 pmSTL - IAD
1 stop5h 04mAmerican Airlines
Deal found 12/16$443
This United Airlines deal was found by Cheapflights users on 12/17. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
dom. 12/298:30 amIAD - STL
Nonstop2h 24mUnited Airlines
vie. 1/38:25 amSTL - IAD
Nonstop2h 18mUnited Airlines
Deal found 12/17$444
This Gotogate deal was found by Cheapflights users on 12/18. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Gotogate is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
vie. 12/208:20 amIAD - STL
1 stop16h 20mFrontier
lun. 12/235:45 pmSTL - IAD
1 stop12h 30mFrontier
Deal found 12/18$603
This Mytrip deal was found by Cheapflights users on 12/18. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Mytrip is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
lun. 12/2312:45 pmIAD - STL
3 stops27h 36mMultiple Airlines
lun. 12/309:50 amSTL - IAD
3 stops22h 02mMultiple Airlines
Deal found 12/18$668

Find flights from Dulles Intl to St. Louis within your budget

Customize your flight search to find flights from Dulles Intl to St. Louis that fit within your specific budget. Explore options based on user searches and filter the results based on your desired price range. Find flights that match your budget for a cost-effective journey. Over the last 7 days, Cheapflights users made 2,558,603 searches. Data last updated diciembre 18, 2024.

Fly from

Any airport

Fly to

Any airport

Route

Depart

Return

Price

Washington, D.C.St. Louis

IAD - STL

IADSTL

Washington, D.C. Dulles Intl

mié. 1/8

5:45 pm-11:30 pm

1 stop6h 45m

Lambert-St Louis

vie. 1/10

8:15 am-11:33 am

Nonstop2h 18m

$239

Washington, D.C.St. Louis

IAD - STL

IADSTL

Washington, D.C. Dulles Intl

mar. 1/14

5:16 pm-9:49 pm

1 stop5h 33m

Lambert-St Louis

vie. 1/17

5:50 pm-11:16 pm

1 stop4h 26m

$248

Washington, D.C.St. Louis

IAD - STL

IADSTL

Washington, D.C. Dulles Intl

vie. 2/28

6:03 pm-11:43 pm

1 stop6h 40m

Lambert-St Louis

dom. 3/2

5:20 pm-5:13 pm

1 stop22h 53m

$274

Washington, D.C.St. Louis

IAD - STL

IADSTL

Washington, D.C. Dulles Intl

vie. 1/17

8:05 pm-11:46 pm

1 stop4h 41m

Lambert-St Louis

lun. 1/20

7:18 am-1:23 pm

1 stop5h 05m

$276

Washington, D.C.St. Louis

IAD - STL

IADSTL

Washington, D.C. Dulles Intl

sáb. 1/18

8:50 am-10:24 am

Nonstop2h 34m

$115

Washington, D.C.St. Louis

IAD - STL

IADSTL

Washington, D.C. Dulles Intl

jue. 1/9

12:31 pm-4:42 pm

1 stop5h 11m

$122

Washington, D.C.St. Louis

IAD - STL

IADSTL

Washington, D.C. Dulles Intl

lun. 1/20

6:05 pm-11:31 pm

1 stop6h 26m

$123

Washington, D.C.St. Louis

IAD - STL

IADSTL

Washington, D.C. Dulles Intl

vie. 1/17

8:05 pm-11:46 pm

1 stop4h 41m

$138

Washington, D.C.St. Louis

IAD - STL

IADSTL

Washington, D.C. Dulles Intl

jue. 3/6

3:35 pm-12:35 am

2 stops10h 00m

$178

Washington, D.C.St. Louis

IAD - STL

IADSTL

Washington, D.C. Dulles Intl

lun. 2/24

5:40 pm-2:42 pm

3 stops22h 02m

$187

Flights are sorted by cheapest round-trip flights first.

Deals found on 12/18

Compare providers for flights from Dulles Intl to St. Louis

Provider information is updated monthly. Please note that these providers often have deals for this flight, but the availability may vary on a day-by-day basis on Cheapflights.
Use the table below to compare price accuracy, trust ratings, and cancellation policies for each provider offering flight deals from Dulles Intl to St. Louis in December.
ProviderPrice AccuracyTrust Score*
ExpediaPrice Accuracy1 starTrust Score*3 stars
FlightHubPrice Accuracy3 starsTrust Score*3 stars
eDreamsPrice Accuracy3 starsTrust Score*3 stars
PricelinePrice Accuracy1 starTrust Score*3 stars

*The Trust Score is based on feedback from users after their booking experience. It measures overall satisfaction, helping us identify issues like hidden fees, problems during the ticketing process, and the quality of customer service. This score is our best indicator of the provider's quality and reliability.

  • Most accurate provider: When it comes to deals on Washington, D.C. Dulles Intl Airport-St. Louis flights, users find the pricing of FlightHub to be most consistent on Cheapflights vs. FlightHub Users can find the same prices on Washington, D.C. Dulles Intl Airport-St. Louis flight deals on Cheapflights vs. FlightHub >95% of the time. Price accuracy is based on data collected from Washington, D.C. Dulles Intl Airport-St. Louis flight searches over the past month and is updated monthly.
  • Most trusted provider: When it comes to deals on Washington, D.C. Dulles Intl Airport-St. Louis flights, Cheapflights users trust FlightHub the most. FlightHub has received a user feedback score of 3 out of 3 stars (3 being the best), meaning they have been trusted the most by Cheapflights users looking for Washington, D.C. Dulles Intl Airport-St. Louis flight deals. Provider user feedback score is based on Cheapflights searches over the past month and is updated monthly.

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.

Travel insights for flights from Dulles Intl to St. Louis

Get recent, data-driven insights about flights from Dulles Intl to St. Louis including ideal travel times, pricing trends, and more.

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 December 13, 2024.

The best time to book flights from Washington, D.C. Dulles Intl Airport to St. Louis is 54 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?

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 diciembre 18, 2024.

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 26% 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?

Use this chart to determine the cheapest time to fly round-trip from Dulles Intl to St. Louis. Price data was last updated on December 16, 2024.

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. Friday evenings flights should be avoided if possible as fares are typically the most expensive at this time.

Rainfall in St. Louis by month

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

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

Get insights into the airlines that provide service to St. Louis. Read reviews, discover amenities, and learn about the overall travel experience offered by airlines. Use this information to make informed decisions when choosing an airline for your flight to St. Louis. Reviews last updated diciembre 18, 2024.
Read reviews from past customers who have flown Delta, United Airlines and American 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
8.1
Very good
4,848 reviews

Crew

8.7

Overall

8.1

Comfort

8.1

Food

7.2

Boarding

8.2

Entertainment

7.7

Reviews

1 / 10

We BARELY made the connection and when we got onboard we were treated like disobedient children who should have arrived earlier because we had to ask other passengers to move so we could sit with our kids. The flight attendants on the first flight were nice but the second one, they were snippy and fairly rude.

Southwest
8.1
Very good
4,848 reviews
Southwest
8.1
Very good
4,848 reviews

Crew

8.7

Overall

8.1

Comfort

8.1

Food

7.2

Boarding

8.2

Entertainment

7.7

Reviews

1 / 10

We BARELY made the connection and when we got onboard we were treated like disobedient children who should have arrived earlier because we had to ask other passengers to move so we could sit with our kids. The flight attendants on the first flight were nice but the second one, they were snippy and fairly rude.

Delta
8.0
Very good
8,604 reviews
Southwest
8.1
Very good
4,848 reviews

Crew

8.7

Overall

8.1

Comfort

8.1

Food

7.2

Boarding

8.2

Entertainment

7.7

Reviews

1 / 10

We BARELY made the connection and when we got onboard we were treated like disobedient children who should have arrived earlier because we had to ask other passengers to move so we could sit with our kids. The flight attendants on the first flight were nice but the second one, they were snippy and fairly rude.

United Airlines
7.4
Good
9,055 reviews
Southwest
8.1
Very good
4,848 reviews

Crew

8.7

Overall

8.1

Comfort

8.1

Food

7.2

Boarding

8.2

Entertainment

7.7

Reviews

1 / 10

We BARELY made the connection and when we got onboard we were treated like disobedient children who should have arrived earlier because we had to ask other passengers to move so we could sit with our kids. The flight attendants on the first flight were nice but the second one, they were snippy and fairly rude.

American Airlines
7.2
Good
10,000 reviews
Southwest
8.1
Very good
4,848 reviews

Crew

8.7

Overall

8.1

Comfort

8.1

Food

7.2

Boarding

8.2

Entertainment

7.7

Reviews

1 / 10

We BARELY made the connection and when we got onboard we were treated like disobedient children who should have arrived earlier because we had to ask other passengers to move so we could sit with our kids. The flight attendants on the first flight were nice but the second one, they were snippy and fairly rude.

Frontier
6.1
Okay
3,479 reviews
Southwest
8.1
Very good
4,848 reviews

Crew

8.7

Overall

8.1

Comfort

8.1

Food

7.2

Boarding

8.2

Entertainment

7.7

Reviews

1 / 10

We BARELY made the connection and when we got onboard we were treated like disobedient children who should have arrived earlier because we had to ask other passengers to move so we could sit with our kids. The flight attendants on the first flight were nice but the second one, they were snippy and fairly rude.

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?

    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 3 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 $239. Other airlines that can offer you cheap pricing are Delta, from $262, and Frontier, from $274. These flights start at 45% 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), Delta ($122), and Frontier ($123).

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

    Consider Copa Airlines (89%), GoJet (88%) or Avianca (88%) 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 $340, our data indicates the cheapest price to be $156. The most popular route (Washington, D.C. Dulles Intl - Lambert-St Louis), is priced around $188.

  • 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.

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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

Discover the top 3 airlines that operate flights from Dulles Intl to St. Louis. Compare their services, reliability, and customer satisfaction ratings to choose the airline that best suits your travel preferences and needs. Over the last 7 days, Cheapflights users made 2,558,603 searches. Data last updated diciembre 18, 2024.
AirlineCheapestAverageFlexibilityOn-time
DeltaCheapest$192Average$300FlexibilityNo cancel feeOn-timeN/A
American AirlinesCheapest$214Average$365FlexibilityNo cancel feeOn-time71%
United AirlinesCheapest$265Average$509FlexibilityNo cancel feeOn-time69%
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