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

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The best prices from Washington Dulles Intl to Lambert-St Louis Intl 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 Lambert-St Louis Intl (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

Round-trip from

$174

From Washington Dulles Intl to Lambert-St Louis Intl

One-way from

$135

One-way flight from Washington Dulles Intl to Lambert-St Louis Intl

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 Lambert-St Louis Intl?

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 Lambert-St Louis Intl?

When searching for a good deal, it’s best to be prepared for potential fluctuations in price. We recommend booking at least 61 days in advance, which can save you up to 33% on flights from Washington Dulles Intl to Lambert-St Louis Intl compared to booking the week you need them. Waiting 61 days out may not be for everyone, so we have options available for flights within the next two weeks, with the lowest price starting at $143. For sooner than that we have options available in the next 3 days from $179.

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

The best pricing can be found in the month of June. Prices to Lambert-St Louis Intl from Washington Dulles Intl average $148. You can even find prices in June for less than $148, as users have found deals to Lambert-St Louis Intl from as low as $77. The month of July appears to be one of the more expensive times to travel to Lambert-St Louis Intl from Washington Dulles Intl. Flying in the targeted month can save you up to 34%.

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

It’s typically best to fly out from Washington Dulles Intl to Lambert-St Louis Intl at noon. Doing so could potentially save you 25% on the flight price compared to flying in the afternoon, which is usually more expensive.

Cheap flights from Washington Dulles Intl to Lambert-St Louis Intl in March, April 2021

31 Mar - 3 Apr
$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
11 Apr - 14 Apr
$169pp
IAD
Washington Dulles Intl
Frontier
 
1 STOP
STL
Lambert-St Louis
STL
Lambert-St Louis
Frontier
 
1 STOP
IAD
Washington Dulles Intl
31 Mar - 3 Apr
$175pp
IAD
Washington Dulles Intl
Multiple Airlines
Non-Stop
STL
Lambert-St Louis
STL
Lambert-St Louis
American Airlines
 
1 STOP
IAD
Washington Dulles Intl

Washington Dulles Intl to Lambert-St Louis Intl 2021 flight deals

31 Mar - 3 Apr
$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
11 Apr - 14 Apr
$169pp
IAD
Washington Dulles Intl
Frontier
 
1 STOP
STL
Lambert-St Louis
STL
Lambert-St Louis
Frontier
 
1 STOP
IAD
Washington Dulles Intl
31 Mar - 3 Apr
$175pp
IAD
Washington Dulles Intl
Multiple Airlines
Non-Stop
STL
Lambert-St Louis
STL
Lambert-St Louis
American Airlines
 
1 STOP
IAD
Washington Dulles Intl

Non-stop flights to Lambert-St Louis Intl from Washington Dulles Intl

31 Mar - 3 Apr
$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
9 Apr - 13 Apr
$182pp
IAD
Washington Dulles Intl
United Airlines
Non-Stop
STL
Lambert-St Louis
STL
Lambert-St Louis
United Airlines
Non-Stop
IAD
Washington Dulles Intl
10 Apr - 18 Apr
$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 Lambert-St Louis Intl

16 Mar - 25 Mar
$238pp
IAD
Washington Dulles Intl
United Airlines
Non-Stop
STL
Lambert-St Louis
STL
Lambert-St Louis
United Airlines
Non-Stop
IAD
Washington Dulles Intl
16 Mar - 25 Mar
$247pp
IAD
Washington Dulles Intl
United Airlines
Non-Stop
STL
Lambert-St Louis
STL
Lambert-St Louis
United Airlines
 
1 STOP
IAD
Washington Dulles Intl
16 Mar - 25 Mar
$253pp
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 Lambert-St Louis Intl from Washington Dulles Intl

3:25 pm - 7:43 pm
Delta
1 Stop
5h 18m
IAD - STL
Delta
$135
Delta
5:02 am - 2:39 pm
Frontier
1 Stop
10h 37m
IAD - STL
Frontier
$159
Kiwi.com
1:13 am - 8:16 am
American Airlines
1 Stop
7h 03m
IAD - STL
American Airlines

Related info for your journey

Flight FAQs

From Washington Dulles Intl to Lambert-St Louis Intl

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 Lambert-St Louis Intl for under $200 on Cheapflights?

Yes, there are multiple flights from Washington Dulles Intl to Lambert-St Louis Intl for under $200. The cheapest flight booked recently is on United Airlines for just $167, but on average you can expect to pay $191.

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

Cheapflights has at least 20 direct flights from Washington Dulles Intl to Lambert-St Louis Intl under $200. A good price for a nonstop flight from Washington Dulles Intl to Lambert-St Louis Intl is less than $303.

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

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

What days are nonstop flights available from Washington Dulles Intl to St Louis?

Nonstop flights are available for this route on the following days: Monday, Tuesday, Wednesday, Thursday.

How many flights depart from Washington Dulles Intl to Lambert-St Louis Intl on average per day?

Travelers can expect 3 flights from Washington Dulles Intl to Lambert-St Louis on average per day.
Afternoon (Noon - 6pm) - 100% of flight departures

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

Washington Dulles Intl will have the same amount of rainfall in 1 compared to St Louis over the next 16 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 Lambert-St Louis Intl?

A quick flight from Washington Dulles Intl to Lambert-St Louis Intl can take about 2h 12m. United Airlines provides one of the quickest options available for as low as $176. The distance from Washington Dulles Intl to Lambert-St Louis Intl is about 698 mi. This flight may include one or multiple stops.

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

Cheapflights users have booked flights from Washington Dulles Intl to Lambert-St Louis Intl round-trip from $167. Other airlines that can offer you cheap pricing are Frontier, from $169, and American Airlines, from $182. United Airlines is currently priced 46% below the average price you’ll pay for this route.

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

To fly one-way, consider booking your trip with United Airlines, which is currently one of the cheapest options available, starting at $84. Frontier flights start at $87 while deals on American Airlines start at $91 one-way.

Alternative routes for Washington Dulles Intl to Lambert-St Louis Intl

Destination information for Lambert-St Louis Intl

Flight duration
2h 12m
Average temperature for March in Lambert-St Louis Intl
59.0 °F
Avg rainfall for March in Lambert-St Louis Intl
3.3 ″

Airports servicing Washington

Airports servicing St. Louis

Top 4 airlines flying from Washington Dulles Intl to Lambert-St Louis Intl

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 Lambert-St Louis Intl

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 Lambert-St Louis Intl
Sunday
5 daily flights
Monday
3 daily flights
Tuesday
1 daily flight
Wednesday
1 daily flight
Thursday
1 daily flight
Friday
3 daily flights
Saturday
3 daily flights
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