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Cheap flights from Washington Dulles Intl to St Louis (IAD - STL)

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The best prices from Washington Dulles Intl to St Louis are usually found in July or August, booked 41 days in advance, depart on a Tuesday or Saturday and return on a Tuesday

How to find the cheapest flight from
Washington Dulles Intl (IAD) to St Louis (STL)

IAD - STL
Price
$174 - $377
STL
Temperature
44.6 - 89.6 °F
STL
Rainfall
2.2 - 5.1 inches

Popular in

March

High demand for flights, 18% potential price rise

Cheapest in

July

Best time to find cheap flights, 44% potential price drop

Average price

$336

Average for round-trip flights in December 2020

Round-trip from

$174

From Washington Dulles Intl to St Louis

Flight route prices based on searches on Cheapflights within the last 3 days, monthly prices based on aggregated historical data.
What is the cheapest day to fly round-trip from Washington Dulles Intl to St Louis?

Users have found that leaving on a Monday can be a cost-effective option. It’s possible to save up to 37% on your flight compared to booking on days when demand is much higher.

How far in advance should I book a flight from Washington Dulles Intl to St Louis?

To save on the cost of your flight from Washington Dulles Intl to St Louis, book at least 31 days before your planned departure. Booking around this time can save you about 96% on the cost of this flight compared to booking a flight leaving this week. We have found prices from $374 if you need a flight within two weeks. For flights within the next 72 hours, you can find tickets from as low as $553.

What is the cheapest month to fly from Washington Dulles Intl to St Louis?

August is one of the best times of the year to fly to St Louis from Washington Dulles Intl. Prices for August average $266 per person but you can even find prices for as low as $158. The most expensive prices can be found in the month of December. Opting for a August flight can save you 23% on your journey compared to booking in August

When is the cheapest time to fly from Washington Dulles Intl to St Louis (IAD - STL)?

It’s optimal to fly from Washington Dulles Intl to St Louis at noon. By choosing this option you can save up to 25% on the cost of your flight, compared to a flight in the afternoon.

Cheap flights from Washington Dulles Intl to St Louis in December, January 2021

The best prices found for IAD to STL flights for December, January
31 Dec - 7 Jan
$147pp
IAD
Washington Dulles Intl
United Airlines
Non-Stop
STL
Lambert-St Louis
STL
Lambert-St Louis
United Airlines
Non-Stop
IAD
Washington Dulles Intl
22 Dec - 24 Dec
$150pp
IAD
Washington Dulles Intl
Multiple Airlines
Non-Stop
STL
Lambert-St Louis
STL
Lambert-St Louis
American Airlines
 
1 STOP
IAD
Washington Dulles Intl
22 Dec - 29 Dec
$151pp
IAD
Washington Dulles Intl
United Airlines
Non-Stop
STL
Lambert-St Louis
STL
Lambert-St Louis
United Airlines
 
1 STOP
IAD
Washington Dulles Intl

Washington Dulles Intl to St Louis 2021 flight deals

Cheap flights to St Louis from Washington Dulles Intl found for this year
31 Dec - 7 Jan
$147pp
IAD
Washington Dulles Intl
United Airlines
Non-Stop
STL
Lambert-St Louis
STL
Lambert-St Louis
United Airlines
Non-Stop
IAD
Washington Dulles Intl
22 Dec - 24 Dec
$150pp
IAD
Washington Dulles Intl
Multiple Airlines
Non-Stop
STL
Lambert-St Louis
STL
Lambert-St Louis
American Airlines
 
1 STOP
IAD
Washington Dulles Intl
22 Dec - 29 Dec
$151pp
IAD
Washington Dulles Intl
United Airlines
Non-Stop
STL
Lambert-St Louis
STL
Lambert-St Louis
United Airlines
 
1 STOP
IAD
Washington Dulles Intl

Non-stop flights to St Louis from Washington Dulles Intl

Save time with Washington Dulles Intl to St Louis direct flight deals
31 Dec - 7 Jan
$147pp
IAD
Washington Dulles Intl
United Airlines
Non-Stop
STL
Lambert-St Louis
STL
Lambert-St Louis
United Airlines
Non-Stop
IAD
Washington Dulles Intl
24 Jan - 28 Jan
$167pp
IAD
Washington Dulles Intl
United Airlines
Non-Stop
STL
Lambert-St Louis
STL
Lambert-St Louis
United Airlines
Non-Stop
IAD
Washington Dulles Intl
15 Dec - 17 Dec
$187pp
IAD
Washington Dulles Intl
United Airlines
Non-Stop
STL
Lambert-St Louis
STL
Lambert-St Louis
United Airlines
Non-Stop
IAD
Washington Dulles Intl

Last minute flights from Washington Dulles Intl to St Louis

Late deals on round-trip flights to St Louis from Washington Dulles Intl, departing today and this week
12 Dec - 9 Jan
$232pp
IAD
Washington Dulles Intl
United Airlines
Non-Stop
STL
Lambert-St Louis
STL
Lambert-St Louis
United Airlines
Non-Stop
IAD
Washington Dulles Intl
12 Dec - 9 Jan
$236pp
IAD
Washington Dulles Intl
United Airlines
Non-Stop
STL
Lambert-St Louis
STL
Lambert-St Louis
United Airlines
 
1 STOP
IAD
Washington Dulles Intl
12 Dec - 9 Jan
$238pp
IAD
Washington Dulles Intl
American Airlines
 
1 STOP
STL
Lambert-St Louis
STL
Lambert-St Louis
American Airlines
 
1 STOP
IAD
Washington Dulles Intl

One-way flights to St Louis from Washington Dulles Intl

The cheapest one-way flights from Washington Dulles Intl to St Louis
2:00 am - 4:17 pm
Delta
3 Stops
15h 17m
IAD - STL
Delta
$182
Delta
1:00 am - 3:09 pm
American Airlines
2 Stops
15h 09m
IAD - STL
American Airlines
12:20 am - 6:23 am
United Airlines
3 Stops
31h 03m
IAD - STL
United Airlines
$203
United

Related info for your journey

Useful info, stats and facts about Washington Dulles Intl to St Louis flights.

Flight FAQs

From Washington Dulles Intl to St Louis

Are flight prices decreasing from Washington Dulles Intl to St Louis due to COVID-19 (coronavirus)?

At this time, Cheapflights has noticed price decreases for many domestic flights due to COVID-19. Travel is not necessarily recommended at this time, and flights may be prone to cancellation: please check with local authorities in both Washington Dulles Intl and St Louis for travel alerts, and be sure to review the airline's cancellation policy and travel advisories before booking. For more information, please view our post on what to know about COVID-19 (coronavirus) and travel.

What safety measures are being taken by airlines flying from Washington Dulles Intl to Lambert-St Louis to control the spread of COVID-19?

Delta is one of the many airlines that have implemented additional safety measures to control the spread of COVID-19. Some of the new policies that have been implemented to accommodate travelers flying from Washington Dulles Intl to Lambert-St Louis are improved sanitation, HEPA filters, mask requirements, social distance seating (for a limited time), and pre-flight testing for antibodies and symptoms. Policies will vary by airline.

Which airlines flying from Washington Dulles Intl to Lambert-St Louis have flexible cancellations due to COVID-19?

Due to the rapidly changing circumstances due to COVID-19, airlines like United Airlines, American Airlines, and Delta flying from Washington Dulles Intl to Lambert-St Louis have implemented new flexible cancellation policies.

Can I find flights from Washington Dulles Intl to St Louis for under $200 on Cheapflights?

Yes, there are multiple flights from Washington Dulles Intl to St Louis for under $200. The cheapest flight booked recently is on United Airlines for just $147, but on average you can expect to pay $168.

Are there nonstop flights from Washington Dulles Intl to St Louis for under $200 on Cheapflights?

Cheapflights has at least 20 direct flights from Washington Dulles Intl to St Louis under $200. A good price for a nonstop flight from Washington Dulles Intl to St Louis is less than $237.

Are there last-minute flights available from Washington Dulles Intl to St Louis for under $300?

There are currently 20+ open flights from Washington Dulles Intl to St Louis within the next 7 days for less than $300.

Does it rain more in Washington Dulles Intl or St Louis?

Washington Dulles Intl will have greater rainfall in 0 compared to St Louis over the next 14 days.

Is Washington Dulles Intl weather warmer or cooler than St Louis?

Our data indicates that the weather will be 90 °F on average in the month of July. The temperature in St Louis is typically hotter than in Washington Dulles Intl. If you're traveling when the temperature is at its warmest, push to plan early, as flight price and availability will have an impact on your travels. For the best results, search for flights well in advance or after peak season.

How long is the flight from Washington Dulles Intl to St Louis?

United Airlines and American Airlines can get you from Washington Dulles Intl to St Louis in just under 2h 12m. Your travel time can differ by up to 3h 07m. Both multi-stop and nonstop flights can be found to your destination and back.

What are the cheapest airlines flying from Washington Dulles Intl to St Louis round-trip?

Our cheapest airline available from Washington Dulles Intl to St Louis is United Airlines. Our recent data shows that you can find tickets from as low as $147 on this airline. Additional options worth looking into are American Airlines and Frontier, starting at $153 and $180 round-trip. You may be able to fly from Washington Dulles Intl to St Louis for 52% less than the average price by searching for these airlines.

What are the cheapest airlines to fly from Washington Dulles Intl to St Louis one-way?

$74 is the cheapest one-way deal found within the past few days, from United Airlines. You may also be able to find cheap deals on American Airlines and Delta, with prices starting from $77 and $78, respectively.

Alternative routes for Washington Dulles Intl to St Louis

Destination information for St Louis

Things to know before you go. Useful info for your trip from Washington Dulles Intl to St Louis
Flight duration
2h 15m
Average temperature for December in St Louis
46.4 °F
Avg rainfall for December in St Louis
2.5 ″

Airports servicing Washington

Airports servicing St. Louis

Top 4 airlines from Washington Dulles Intl to St Louis

The chart below displays the airlines Cheapflights users traveling from Washington Dulles Intl to St Louis choose most often. Cheapest and average prices are based on aggregated data from the past 12 months.

Airline Cheapest Average Flexibility On-time COVID-19 safety
Frontier
$105 $223 No cancel fee 62%
American Airlines
$128 $323 No cancel fee 71%
Delta
$155 $368 No cancel fee N/A
United Airlines
$198 $387 No cancel fee 69%

Hourly flight availability from Washington Dulles Intl to St Louis

Afternoon Noon to 6 PM 100% of IAD to STL departures
Early morning Midnight to 6 AM 0% of IAD to STL departures
Morning 6 AM to noon 0% of IAD to STL departures
Evening 6 PM to midnight 0% of IAD to STL departures
Midnight
6 AM
Noon
6 PM
Weekly flight availability
from Washington Dulles Intl to St Louis
Sunday
6 daily flights
Monday
6 daily flights
Tuesday
3 daily flights
Wednesday
6 daily flights
Thursday
6 daily flights
Friday
3 daily flights
Saturday
6 daily flights
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