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$64+ Cheap flights from Washington 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 3/13. Fares are subject to change and may not be available on all flights or dates of travel.
SEA — STL
feb. 4 — feb. 111
mar. 2/4
mar. 2/11
1 adult, Economy
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Cheap flight deals from Washington to St. Louis

Discover tips and strategies to find the most affordable flight options for your journey from Washington (USWA) 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 enero 30, 2025.

Most accurate provider

FlightHub
3 stars

Most trusted provider

FlightHub
3 stars

Round-trip from

$120
(CheapOair)

One-way from

$64
(Trip.com)

Popular in

December

Cheapest in

January

Average price

$296

Good round-trip deal

$342 or less

Good one-way deal

$233 or less
Provider with most accurate pricing for Seattle/Tacoma Intl-Lambert-St Louis flight deals.
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Provider most trusted by Cheapflights users for Seattle/Tacoma Intl-Lambert-St Louis flights.
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From Washington to Lambert-St Louis
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One-way flight from Washington to Lambert-St Louis
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Highest demand for flights based on searches. 5% potential increase in price ($22 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 January 2025
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Price to beat on a round-trip flight from Washington to Lambert-St Louis.
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Price to beat on a one-way flight from Washington to Lambert-St Louis.
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Find flight deals from Washington to St. Louis

Cheapest flights from Washington to St. Louis
Explore the most affordable flight options available from Washington to St. Louis. Find the lowest fares from popular airlines and budget airlines, with prices last updated on enero 30, 2025.

This CheapOair deal was found by Cheapflights users on 1/29. 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 CheapOair is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
mar. 2/186:32 amPDX - STL
1 stop24h 44mFrontier
mié. 2/266:43 pmSTL - PDX
1 stop15h 57mFrontier
Deal found 1/29$120
This United Airlines deal was found by Cheapflights users on 1/29. 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.
vie. 9/512:51 pmPDX - STL
1 stop7h 15mUnited Airlines
sáb. 9/65:30 amSTL - PDX
1 stop6h 10mUnited Airlines
Deal found 1/29$222
This American Airlines deal was found by Cheapflights users on 1/30. 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.
mié. 4/211:59 pmPDX - STL
1 stop6h 49mAmerican Airlines
mar. 4/81:48 pmSTL - PDX
1 stop8h 47mAmerican Airlines
Deal found 1/30$227
This Alaska Airlines deal was found by Cheapflights users on 1/29. 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 Alaska Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
mié. 2/266:11 pmSEA - STL
Nonstop3h 48mAlaska Airlines
dom. 3/27:00 amSTL - SEA
Nonstop4h 35mAlaska Airlines
Deal found 1/29$247
This Booking.com deal was found by Cheapflights users on 1/29. 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 Booking.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
jue. 2/132:02 pmSEA - STL
1 stop17h 14mFrontier
vie. 2/2111:08 pmSTL - SEA
1 stop12h 22mFrontier
Deal found 1/29$250
This Southwest deal was found by Cheapflights users on 1/29. 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 Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
mié. 2/2610:40 amSEA - STL
1 stop9h 25mSouthwest
mar. 3/411:15 amSTL - SEA
2 stops8h 35mSouthwest
Deal found 1/29$252
This Delta deal was found by Cheapflights users on 1/29. 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.
jue. 3/135:26 pmPDX - STL
1 stop5h 06mDelta
lun. 3/177:30 pmSTL - PDX
1 stop6h 14mDelta
Deal found 1/29$253
This United Airlines deal was found by Cheapflights users on 1/29. 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.
mié. 2/198:50 amSEA - STL
1 stop5h 43mUnited Airlines
jue. 2/206:30 amSTL - SEA
2 stops11h 24mUnited Airlines
Deal found 1/29$256
This Delta deal was found by Cheapflights users on 1/29. 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.
jue. 2/136:15 amSEA - STL
1 stop8h 38mDelta
mar. 2/185:00 pmSTL - SEA
1 stop9h 50mDelta
Deal found 1/29$258
This Alaska Airlines deal was found by Cheapflights users on 1/29. 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 Alaska Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
vie. 9/262:45 pmPDX - STL
1 stop7h 11mAlaska Airlines
mar. 9/307:30 pmSTL - PDX
1 stop6h 23mAlaska Airlines
Deal found 1/29$267
This Orbitz deal was found by Cheapflights users on 1/29. 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 Orbitz is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
jue. 2/136:11 pmSEA - STL
Nonstop3h 48mMultiple Airlines
vie. 2/2111:08 pmSTL - SEA
1 stop12h 22mMultiple Airlines
Deal found 1/29$289
This American Airlines deal was found by Cheapflights users on 1/29. 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. 3/108:26 amSEA - STL
Nonstop3h 59mAmerican Airlines
mié. 3/125:37 pmSTL - SEA
1 stop9h 11mAmerican Airlines
Deal found 1/29$297

Find flights from Washington to St. Louis within your budget

Customize your flight search to find flights from Washington 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 enero 30, 2025.

Fly from

Any airport

Fly to

Any airport

Route

Depart

Return

Price

PortlandSt. Louis

PDX - STL

PDXSTL

Portland

mar. 2/18

6:32 am-9:16 am

1 stop24h 44m

Lambert-St Louis

mié. 2/26

6:43 pm-8:40 am

1 stop15h 57m

$120

PortlandSt. Louis

PDX - STL

PDXSTL

Portland

mié. 4/2

11:59 pm-8:48 am

1 stop6h 49m

Lambert-St Louis

mar. 4/8

1:48 pm-8:35 pm

1 stop8h 47m

$227

SeattleSt. Louis

SEA - STL

SEASTL

Seattle/Tacoma Intl

mié. 2/26

6:11 pm-11:59 pm

Nonstop3h 48m

Lambert-St Louis

lun. 3/3

7:00 am-9:35 am

Nonstop4h 35m

$247

SeattleSt. Louis

SEA - STL

SEASTL

Seattle/Tacoma Intl

jue. 2/13

2:02 pm-9:16 am

1 stop17h 14m

Lambert-St Louis

vie. 2/21

11:08 pm-9:30 am

1 stop12h 22m

$250

SeattleSt. Louis

SEA - STL

SEASTL

Seattle/Tacoma Intl

mié. 2/26

10:40 am-10:05 pm

1 stop9h 25m

Lambert-St Louis

mar. 3/4

11:15 am-5:50 pm

2 stops8h 35m

$252

PortlandSt. Louis

PDX - STL

PDXSTL

Portland

jue. 3/13

5:26 pm-12:32 am

1 stop5h 06m

Lambert-St Louis

lun. 3/17

7:30 pm-11:44 pm

1 stop6h 14m

$253

SeattleSt. Louis

SEA - STL

SEASTL

Seattle/Tacoma Intl

sáb. 3/1

9:20 am-8:44 pm

2 stops9h 24m

Lambert-St Louis

jue. 3/6

7:00 am-1:43 pm

1 stop8h 43m

$255

SeattleSt. Louis

SEA - STL

SEASTL

Seattle/Tacoma Intl

jue. 2/13

6:15 am-4:53 pm

1 stop8h 38m

Lambert-St Louis

mar. 2/18

5:00 pm-12:50 am

1 stop9h 50m

$258

PortlandSt. Louis

PDX - STL

PDXSTL

Portland

mié. 4/30

7:54 am-4:52 pm

1 stop6h 58m

Lambert-St Louis

lun. 5/5

6:11 pm-1:10 am

1 stop8h 59m

$264

SeattleSt. Louis

SEA - STL

SEASTL

Seattle/Tacoma Intl

jue. 2/13

6:11 pm-11:59 pm

Nonstop3h 48m

Lambert-St Louis

vie. 2/21

11:08 pm-9:30 am

1 stop12h 22m

$289

Flights are sorted by cheapest round-trip flights first.

Deals found on 1/29

Showing 1-10 of 45 results
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Best time to book a flight from Washington to St. Louis

Have a flexible travel schedule? Discover the best time to fly to St. Louis from Washington 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 Washington to St. Louis

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

What is the cheapest month to book a flight from State of Washington to St. Louis?

Currently, August is the cheapest month in which you can book a flight from State of Washington to St. Louis (average of $311). Flying from State of Washington 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 WA to STL?

Find hourly flight availability from Washington 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 enero 30, 2025.

When flying from State of Washington to St. Louis, the time of day you decide to fly out makes little to no difference towards the overall price you’ll pay on tickets.

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 enero 30, 2025.
Peruse reviews from past customers who have flown with Southwest, Alaska Airlines and Delta from Washington to St. Louis to help guide your decision. Reviews also offer insight into each airline's entertainment options, comfort, food, crew/service, and boarding process.
Southwest
8.1
Very good
4,585 reviews

Crew

8.7

Food

7.1

Entertainment

7.7

Boarding

8.2

Comfort

8.1

Overall

8.1

Reviews

1 / 20

6.0
Good

Lauren,Dec 2024

MCI - DCA

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
4,585 reviews
Southwest
8.1
Very good
4,585 reviews

Crew

8.7

Food

7.1

Entertainment

7.7

Boarding

8.2

Comfort

8.1

Overall

8.1

Reviews

1 / 20

6.0
Good

Lauren,Dec 2024

MCI - DCA

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.

Alaska Airlines
8.0
Very good
9,688 reviews
Southwest
8.1
Very good
4,585 reviews

Crew

8.7

Food

7.1

Entertainment

7.7

Boarding

8.2

Comfort

8.1

Overall

8.1

Reviews

1 / 20

6.0
Good

Lauren,Dec 2024

MCI - DCA

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
8,454 reviews
Southwest
8.1
Very good
4,585 reviews

Crew

8.7

Food

7.1

Entertainment

7.7

Boarding

8.2

Comfort

8.1

Overall

8.1

Reviews

1 / 20

6.0
Good

Lauren,Dec 2024

MCI - DCA

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
8,913 reviews
Southwest
8.1
Very good
4,585 reviews

Crew

8.7

Food

7.1

Entertainment

7.7

Boarding

8.2

Comfort

8.1

Overall

8.1

Reviews

1 / 20

6.0
Good

Lauren,Dec 2024

MCI - DCA

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
4,585 reviews

Crew

8.7

Food

7.1

Entertainment

7.7

Boarding

8.2

Comfort

8.1

Overall

8.1

Reviews

1 / 20

6.0
Good

Lauren,Dec 2024

MCI - DCA

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 Washington 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?

    Lambert-St Louis (STL), located 12.7 mi from the city center, is the airport you fly into when you book flights from Washington to St. Louis.

  • How popular is this State of Washington to St. Louis flight route?

    This flight path from Washington to Lambert-St Louis was viewed by 5 users in the past month. Keep an eye out for changes in search interest prior to high and low season.

  • What are the cheapest airlines to fly from State of Washington to St. Louis one-way?

    One-way options have recently been found by users for as low as $64 on Frontier. Other airlines that offer cheap prices include American Airlines from $79 and Delta from $109 one-way.

  • What are the most popular routes from State of Washington to St. Louis?

    The most popular flight routes from State of Washington to St. Louis are Seattle/Tacoma Intl - Lambert-St Louis, Portland - Lambert-St Louis and Spokane - Lambert-St Louis.

  • What are the most reliable airlines from State of Washington to St. Louis?

    The top 3 most reliable airlines when flying from State of Washington to St. Louis are Hawaiian Airlines (86%), American Airlines (86%) and Singapore Airlines (86%).

  • What are the cheapest flights from State of Washington to St. Louis?

    The cheapest flight price from State of Washington to St. Louis is $148. On average you can expect to pay $360. The most popular route, (Seattle/Tacoma Intl - Lambert-St Louis), can usually be booked for $184.

  • Can I find deals for flights from Washington to St. Louis that include hotel bookings?

    Yes. In addition to deals on Washington to St. Louis flights, Cheapflights offers vacation packages that include both flights and hotel.

  • How can I find direct flights from Washington to St. Louis?

    After entering your origin and destination, apply the non-stop filter on the search result page to find direct flights from Washington to St. Louis.

  • Can I find deals for business class flights from Washington to St. Louis?

    Yes. Cheapflights offers flight deals from Washington 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 State of Washington to St. Louis?

    Currently, August is the cheapest month in which you can book a flight from State of Washington to St. Louis (average of $311). Flying from State of Washington 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

Traveling to a place near Washington?

Book flights to Washington if you plan to visit one of these locations
Fenton
Fairview Heights
Maryland Heights
Collinsville
Wentzville
Eureka
St. Peters
Festus
Alton
Farmington
Chesterfield

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Alternative routes for Washington to St. Louis

See prices for flight routes from nearby airports that may be better suited for you.
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Top 6 airlines flying from Washington to St. Louis

Discover the top 6 airlines that operate flights from Washington 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 enero 30, 2025.
AirlineCheapestAverageFlexibilityOn-time
FrontierCheapest$141Average$233FlexibilityNo cancel feeOn-time62%
American AirlinesCheapest$196Average$420FlexibilityNo cancel feeOn-time71%
DeltaCheapest$200Average$410FlexibilityNo cancel feeOn-timeN/A
United AirlinesCheapest$216Average$473FlexibilityNo cancel feeOn-time69%
Alaska AirlinesCheapest$235Average$512FlexibilityNo cancel feeOn-time75%
SouthwestCheapest$321Average$471FlexibilityNo cancel feeOn-time63%
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