Cheap flights from St. Louis (STL) to Washington from $45

This is the cheapest one-way flight price, found on 9/27. Prices may vary by date and flight preferences.
STL — SEA
Oct 3 — Oct 101

How far in advance should I book a flight from St. Louis to State of Washington?

Users have found that booking a flight from St. Louis to State of Washington at least 54 days early can save you up to 31% on average compared to booking a flight this week. If booking 54 days before your flight isn’t an option for you, users have found flights from St. Louis to State of Washington for as little as $512 when booking for a departure date within the next two weeks. You can also check prices now. Some users have found airline tickets as low as $596 for flights departing within the next 3 days.

What is the cheapest month to fly from St. Louis to State of Washington?

Flights from St. Louis to State of Washington lean towards being more expensive in July. Prices are generally better when you fly from St. Louis to State of Washington in January, with the cheapest ticket starting at $199.

When is the cheapest time to fly from St. Louis to State of Washington (STL - WA)?

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

Cheap Delta flights from St. Louis to Washington

Check out some of the cheapest Delta flights we've come across from St. Louis to Washington. It's recommended that users confirm their flight details before booking.

Cheap Alaska Airlines flights from St. Louis to Washington

Take a gander at the lowest prices we've found on Alaska Airlines flights from St. Louis to Washington. Check back soon if you're not seeing flights that suit your needs.

Cheap St. Louis to Washington flights in September & October 2023

The best prices found for STL to Washington flights for September, October
Check out some of the best flight deals from St. Louis to Washington in 2023. Check back regularly for other flight deals.

St. Louis to Washington 2023 flight deals

Cheap flights to Washington from St. Louis found for this year
Check out some of the best flight deals from St. Louis to Washington in 2023. Check back regularly for other flight deals.

Non-stop flights to Washington from St. Louis

Save time with St. Louis to Washington direct flight deals
To help reduce your travel time, choose from one of these non-stop flights from St. Louis to Washington. Users can also choose from other St. Louis to Washington flights by using the search form above.

St. Louis to Washington flights leaving soon

Late deals on return flights to Washington from St. Louis, departing today and this week
Have a look at some of the flights available from St. Louis to Washington departing last-minute. It's wise to confirm all flight details are correct before booking.

One-way flights to Washington from St. Louis

The cheapest one-way flights from St. Louis to Washington
If you're seeking multiple options on one-way flights from St. Louis to Washington, be sure to check out these deals, which are updated often. Users can also find round-trip St. Louis to Washington flights by using the search form above.

Find flights from St. Louis to Washington within your budget

Use the slider to find flights from St. Louis to Washington that fit your budget.

Fly from

Any airport

Fly to

Any airport

Budget

$99 - $237

Route

Depart

Return

Price

Lambert-St LouisSeattle/Tacoma Intl

STL - SEA

STLSEA

Lambert-St Louis

Sat 10/21

1 stop21h 00m

Seattle/Tacoma Intl

Fri 12/1

1 stop14h 12m

Lambert-St LouisSeattle/Tacoma Intl

STL - SEA

STLSEA

Lambert-St Louis

Tue 11/7

1 stop11h 21m

Seattle/Tacoma Intl

Sat 11/11

1 stop17h 57m

Lambert-St LouisSeattle/Tacoma Intl

STL - SEA

STLSEA

Lambert-St Louis

Tue 11/7

1 stop11h 21m

Seattle/Tacoma Intl

Sat 11/11

1 stop17h 57m

Lambert-St LouisSeattle/Tacoma Intl

STL - SEA

STLSEA

Lambert-St Louis

Tue 10/24

1 stop10h 25m

Seattle/Tacoma Intl

Fri 12/1

2 stops11h 59m

Lambert-St LouisSeattle/Tacoma Intl

STL - SEA

STLSEA

Lambert-St Louis

Mon 10/30

1 stop7h 46m

Seattle/Tacoma Intl

Tue 11/7

1 stop7h 46m

Lambert-St LouisSeattle/Tacoma Intl

STL - SEA

STLSEA

Lambert-St Louis

Wed 10/25

2 stops19h 10m

Seattle/Tacoma Intl

Wed 11/1

3 stops21h 57m

Lambert-St LouisSeattle/Tacoma Intl

STL - SEA

STLSEA

Lambert-St Louis

Sat 10/21

Nonstop4h 35m

Seattle/Tacoma Intl

Tue 11/28

Nonstop3h 50m

Lambert-St LouisSeattle/Tacoma Intl

STL - SEA

STLSEA

Lambert-St Louis

Thu 1/25

1 stop8h 20m

Seattle/Tacoma Intl

Sat 1/27

2 stops10h 55m

Lambert-St LouisSeattle/Tacoma Intl

STL - SEA

STLSEA

Lambert-St Louis

Sun 12/10

1 stop6h 25m

Seattle/Tacoma Intl

Sat 12/16

1 stop5h 42m

Flights are sorted by cheapest first

Deals found on 9/27

Reviews of airlines servicing Washington

Get a feel of what it's like to fly with Delta, Alaska Airlines and Frontier from St. Louis to Washington by reading reviews from past customers. Users have also rated airlines in terms of entertainment options, comfort, food, crew/service, and boarding process.
Alaska Airlines
8.1
Very good
1,394 reviews

Food

7.2

Comfort

8.0

Boarding

8.3

Entertainment

7.2

Overall

8.1

Crew

8.6

Reviews

1 / 10

Maintenance delay, weather delays in DEN and once we arrived in SEA. 3 hour flight resulted in 6+ hours on the plane.

Alaska Airlines
8.1
Very good
1,394 reviews
Alaska Airlines
8.1
Very good
1,394 reviews

Food

7.2

Comfort

8.0

Boarding

8.3

Entertainment

7.2

Overall

8.1

Crew

8.6

Reviews

1 / 10

Maintenance delay, weather delays in DEN and once we arrived in SEA. 3 hour flight resulted in 6+ hours on the plane.

Delta
7.9
Good
3,023 reviews
Alaska Airlines
8.1
Very good
1,394 reviews

Food

7.2

Comfort

8.0

Boarding

8.3

Entertainment

7.2

Overall

8.1

Crew

8.6

Reviews

1 / 10

Maintenance delay, weather delays in DEN and once we arrived in SEA. 3 hour flight resulted in 6+ hours on the plane.

United Airlines
7.4
Good
1,890 reviews
Alaska Airlines
8.1
Very good
1,394 reviews

Food

7.2

Comfort

8.0

Boarding

8.3

Entertainment

7.2

Overall

8.1

Crew

8.6

Reviews

1 / 10

Maintenance delay, weather delays in DEN and once we arrived in SEA. 3 hour flight resulted in 6+ hours on the plane.

American Airlines
7.2
Good
2,635 reviews
Alaska Airlines
8.1
Very good
1,394 reviews

Food

7.2

Comfort

8.0

Boarding

8.3

Entertainment

7.2

Overall

8.1

Crew

8.6

Reviews

1 / 10

Maintenance delay, weather delays in DEN and once we arrived in SEA. 3 hour flight resulted in 6+ hours on the plane.

Spirit Airlines
6.3
Okay
1,483 reviews
Alaska Airlines
8.1
Very good
1,394 reviews

Food

7.2

Comfort

8.0

Boarding

8.3

Entertainment

7.2

Overall

8.1

Crew

8.6

Reviews

1 / 10

Maintenance delay, weather delays in DEN and once we arrived in SEA. 3 hour flight resulted in 6+ hours on the plane.

Related info for your journey

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

What airport do you fly from for flights from St. Louis to Washington?

For a flight from St. Louis to Washington, you will be flying from Lambert-St Louis. Lambert-St Louis (STL) is just 12.7 mi from the center of the city.

Can I find flights from St. Louis to State of Washington for under $100 on Cheapflights?

Yes, there are multiple flights from St. Louis to State of Washington for under $100. The cheapest flight booked recently is on Frontier for just $99, but on average you can expect to pay $124.

Are there nonstop flights from St. Louis to State of Washington for under $300 on Cheapflights?

Cheapflights has at least 20 direct flights from St. Louis to State of Washington under $300. A good price for a nonstop flight from St. Louis to State of Washington is less than $322.

Are there last-minute flights available from St. Louis to State of Washington for under $200?

There are currently 20+ open flights from St. Louis to State of Washington within the next 7 days for less than $200.

What days are nonstop flights available from St. Louis to State of Washington?

Days when nonstop flights are available for this flight are: Monday, Thursday, Friday, Saturday.

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

How many flights depart from St. Louis to State of Washington on average per day?

15 flight departures from St. Louis to State of Washington per day on average.
Morning (6am - Noon) - 47% of flight departures
Afternoon (Noon - 6pm) - 40% of flight departures
Evening (6pm - Midnight) - 13% of flight departures

How long is the flight from St. Louis to State of Washington?

Frontier can get you from St. Louis to State of Washington in just under 21h. Your travel time can differ by up to . St. Louis and State of Washington are separated by a distance of 1714 mi.

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

To fly one-way, consider booking your trip with Frontier, which is currently one of the cheapest options available, starting at $45. Spirit Airlines flights start at $57 while deals on Alaska Airlines start at $138 one-way.

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

What are the most popular airlines that fly from St. Louis to State of Washington?

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

The top 3 most reliable airlines when flying from St. Louis to State of Washington are Air Tahiti Nui (92%), Qatar Airways (92%) and Japan Airlines (92%).

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

Looking for the cheapest flight from St. Louis to State of Washington? While on average our users pay $916, our data indicates the cheapest price to be $99. The most popular route (Lambert-St Louis - Seattle/Tacoma Intl), is priced around $109.

What does STL to SEA mean?

STL stands for Lambert-St Louis Airport, while SEA stands for Seattle/Tacoma Intl Airport. These codes are often called IATA codes, a set of identifiers established by IATA (International Air Transport Association) that is widely used by airlines and the aviation industry. While you’re still figuring out your travel plans, it’s not a bad idea to learn the names and codes of other airports around these areas: Spokane Airport (GEG), Pasco Tri Cities Airport (PSC), Bellingham Airport (BLI), Everett Paine Field Airport (PAE), Pullman Moscow Regional Airport (PUW).

Destination points for flights from St. Louis to Washington

Select to see more specific information for flights from St. Louis to all places in Washington

Top 7 airlines flying from St. Louis to Washington

The chart below displays the airlines Cheapflights users traveling from St. Louis to Washington choose most often. Cheapest and average prices are based on aggregated data from the past 12 months.
AirlineCheapestAverageFlexibilityOn-time
United AirlinesCheapest$148Average$469FlexibilityNo cancel feeOn-time69%
Search United Airlines flights
Spirit AirlinesCheapest$152Average$279FlexibilityNo cancel feeOn-time65%
Search Spirit Airlines flights
FrontierCheapest$154Average$233FlexibilityNo cancel feeOn-time62%
Search Frontier flights
Alaska AirlinesCheapest$168Average$483FlexibilityNo cancel feeOn-time75%
Search Alaska Airlines flights
Sun Country AirCheapest$218Average$380FlexibilityNo cancel feeOn-time83%
Search Sun Country Air flights
DeltaCheapest$236Average$474FlexibilityNo cancel feeOn-timeN/A
Search Delta flights
American AirlinesCheapest$254Average$551FlexibilityNo cancel feeOn-time71%
Search American Airlines flights

Hourly flight availability from St. Louis to Washington

See what time of day planes typically take off from St. Louis to Washington
1%of flight departuresEarly morningMidnight to 6 am
62%of flight departuresMorning6 am to noon
12%of flight departuresAfternoonNoon to 6 pm
25%of flight departuresEvening6 pm to midnight
Midnight
6 AM
Noon
6 PM

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How does Cheapflights help users find flights from St. Louis to Washington?

When you search for this flight from St. Louis to Washington, Cheapflights searches on 900+ travel sites to save you time finding great flight deals online. Additionally, we offer filter features so you can choose a preferred cabin class or airline, see different price ranges, and much more so you can book the flight for you.

Why should you use Cheapflights to find cheap flight tickets from St. Louis to Washington?

Cheapflights taps into our reliable network of hundreds of airlines and travel agencies to find the best deals for flights from St. Louis to Washington for you. Better yet — we are completely free to use.

Can Cheapflights find flights from St. Louis to Washington with no change fees?

Certainly. Search results for flights to Washington from St. Louis shown to you on Cheapflights can be narrowed down with different useful search filters, which includes flexible booking options.

Can Cheapflights notify me if prices for flights from St. Louis to Washington become cheaper?

Yes! Start tracking prices for St. Louis to Washington flights today and get alerted whenever prices for these flights change. To access this feature, navigate to the search form above to perform a search, which will then prompt you for a valid email address to use the tool.

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