Cheap flights from Seattle to Lambert-St Louis Intl (SEA - STL)

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The best prices from Seattle to Lambert-St Louis Intl are usually found in August or July, booked 29 days in advance, depart on a Wednesday or Tuesday and return on a Wednesday

How to find the cheapest flight from
Seattle (SEA) to Lambert-St Louis Intl (STL)

SEA - STL
Price
$246 - $402
STL
Temperature
44.6 - 89.6 °F
STL
Rainfall
2.2 - 5.1 inches

Popular in

December

High demand for flights, 27% potential price rise

Cheapest in

August

Best time to find cheap flights, 16% potential price drop

Round-trip from

$246

From Seattle to Lambert-St Louis Intl

One-way from

$99

One-way flight from Seattle 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 Seattle to Lambert-St Louis Intl?

Flights from Seattle to Lambert-St Louis Intl are found to be more expensive on Saturday. This shouldn't discourage you from searching as you can still find great deals by being flexible with your options. Use our search form to find deals on tickets to Lambert-St Louis Intl.

How far in advance should I book a flight from Seattle to Lambert-St Louis Intl?

Users have found that booking a flight from Seattle to Lambert-St Louis Intl at least 61 days early can save you up to 33% on average compared to booking a flight this week. If booking 61 days before your flight isn’t an option for you, users have found flights from Seattle to Lambert-St Louis Intl for as little as $143 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 $179 for flights departing within the next 3 days.

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

Due to multiple factors, expect to potentially pay more when booking in July. For low rates, June can be a great choice for travel to Lambert-St Louis Intl. Flights to Lambert-St Louis Intl from Seattle in June are about $148 on average during June, but can be found for as low as $77.

When is the cheapest time to fly from Seattle to Lambert-St Louis Intl (SEA - STL)?

It’s optimal to fly from Seattle to Lambert-St Louis Intl at noon. By choosing this option you can save up to 22% on the cost of your flight, compared to a flight in the morning.

Cheap flights from Seattle to Lambert-St Louis Intl in February, March 2021

30 Mar - 31 Mar
$88pp
SEA
Seattle/Tacoma Intl
Frontier
 
1 STOP
STL
Lambert-St Louis
STL
Lambert-St Louis
Frontier
 
1 STOP
SEA
Seattle/Tacoma Intl
26 Mar - 29 Mar
$98pp
SEA
Seattle/Tacoma Intl
Frontier
 
1 STOP
STL
Lambert-St Louis
STL
Lambert-St Louis
Frontier
 
1 STOP
SEA
Seattle/Tacoma Intl
30 Mar - 31 Mar
$138pp
SEA
Seattle/Tacoma Intl
Multiple Airlines
 
1 STOP
STL
Lambert-St Louis
STL
Lambert-St Louis
Multiple Airlines
     
3 STOPS
SEA
Seattle/Tacoma Intl

Seattle to Lambert-St Louis Intl 2021 flight deals

30 Mar - 31 Mar
$88pp
SEA
Seattle/Tacoma Intl
Frontier
 
1 STOP
STL
Lambert-St Louis
STL
Lambert-St Louis
Frontier
 
1 STOP
SEA
Seattle/Tacoma Intl
26 Mar - 29 Mar
$98pp
SEA
Seattle/Tacoma Intl
Frontier
 
1 STOP
STL
Lambert-St Louis
STL
Lambert-St Louis
Frontier
 
1 STOP
SEA
Seattle/Tacoma Intl
1 Apr - 6 Apr
$99pp
SEA
Seattle/Tacoma Intl
Frontier
 
1 STOP
STL
Lambert-St Louis
STL
Lambert-St Louis
Frontier
 
1 STOP
SEA
Seattle/Tacoma Intl

Non-stop flights to Lambert-St Louis Intl from Seattle

30 Mar - 31 Mar
$197pp
SEA
Seattle/Tacoma Intl
Alaska Airlines
Non-Stop
STL
Lambert-St Louis
STL
Lambert-St Louis
Alaska Airlines
Non-Stop
SEA
Seattle/Tacoma Intl
23 Mar - 25 Mar
$217pp
SEA
Seattle/Tacoma Intl
Alaska Airlines
Non-Stop
STL
Lambert-St Louis
STL
Lambert-St Louis
Alaska Airlines
Non-Stop
SEA
Seattle/Tacoma Intl
25 Mar - 1 Apr
$237pp
SEA
Seattle/Tacoma Intl
Alaska Airlines
Non-Stop
STL
Lambert-St Louis
STL
Lambert-St Louis
Alaska Airlines
Non-Stop
SEA
Seattle/Tacoma Intl

Last minute flights from Seattle to Lambert-St Louis Intl

4 Mar - 11 Mar
$203pp
SEA
Seattle/Tacoma Intl
Frontier
 
1 STOP
STL
Lambert-St Louis
STL
Lambert-St Louis
Frontier
 
1 STOP
SEA
Seattle/Tacoma Intl
3 Mar - 6 Mar
$241pp
SEA
Seattle/Tacoma Intl
Multiple Airlines
   
2 STOPS
STL
Lambert-St Louis
STL
Lambert-St Louis
Frontier
     
3 STOPS
SEA
Seattle/Tacoma Intl
3 Mar - 5 Mar
$244pp
SEA
Seattle/Tacoma Intl
Multiple Airlines
   
2 STOPS
STL
Lambert-St Louis
STL
Lambert-St Louis
Multiple Airlines
 
1 STOP
SEA
Seattle/Tacoma Intl

One-way flights to Lambert-St Louis Intl from Seattle

11:50 am - 5:39 pm
Alaska Airlines
Nonstop
3h 49m
SEA - STL
Alaska Airlines
3:16 pm - 3:01 pm
Frontier
1 Stop
21h 45m
SEA - STL
Frontier
$115
Kiwi.com
10:35 am - 6:16 am
Multiple Airlines
1 Stop
17h 41m
SEA - STL
Multiple Airlines
$116
Gotogate

Related info for your journey

Flight FAQs

From Seattle to Lambert-St Louis Intl

Are flight prices decreasing from Seattle 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 Seattle 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 Seattle/Tacoma Intl to Lambert-St Louis to control the spread of COVID-19?

Alaska Airlines and Delta are some 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 Seattle/Tacoma 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 Seattle/Tacoma Intl to Lambert-St Louis have flexible cancellations due to COVID-19?

Alaska Airlines, Delta, and Frontier are some of the carriers that may have flexible cancellation policies. You can use our site to filter for other airlines that may also have this kind of flexibility.

Can I find flights from Seattle to Lambert-St Louis Intl for under $100 on Cheapflights?

Yes, there are multiple flights from Seattle to Lambert-St Louis Intl for under $100. The cheapest flight booked recently is on Frontier for just $88, but on average you can expect to pay $139.

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

Cheapflights has at least 20 direct flights from Seattle to Lambert-St Louis Intl under $200. A good price for a nonstop flight from Seattle to Lambert-St Louis Intl is less than $345.

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

There are currently 17+ open flights from Seattle to Lambert-St Louis Intl within the next 7 days for less than $300.

Does it rain more in Seattle or St Louis?

When traveling, it's generally smart to pack in preparation for rain or any other conditions that may arise. The rainfall in Seattle is roughly greater than that of St Louis. You can assume this to be the case over the next 18 days.

Is Seattle weather warmer or cooler than St Louis?

Temperatures around the 90 °F's can be experienced in July. The weather in St Louis is hotter than in Seattle. Plan for potential changes in flight availability as peak weather approaches in this location.

How long is the flight from Seattle to Lambert-St Louis Intl?

For as low as $117, Frontier can have you in Lambert-St Louis Intl from Seattle in 7h 13m.

What is the cheapest airline to fly from Seattle to Lambert-St Louis Intl round-trip?

According to our current data, Frontier ($88), offers the cheapest pricing from Seattle to Lambert-St Louis Intl. Frontier is currently priced 70% below the average price you’ll pay for this route.

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

The cheapest airline one-way is Frontier, with whom users have recently found tickets for as low as $50. Check flights for Alaska Airlines, as they currently have the next best price.

Alternative routes for Seattle to Lambert-St Louis Intl

Destination information for Lambert-St Louis Intl

Average temperature for February in Lambert-St Louis Intl
48.2 °F
Avg rainfall for February in Lambert-St Louis Intl
2.2 ″

Airports servicing Seattle

Airports servicing St. Louis

Top 6 airlines flying from Seattle to Lambert-St Louis Intl

Airline Cheapest Average Flexibility On-time COVID-19 safety
Frontier
$115 $263 No cancel fee 62%
Sun Country Air
$146 $269 No cancel fee 83%
Delta
$117 $336 No cancel fee N/A
American Airlines
$137 $346 No cancel fee 71%
United Airlines
$140 $348 No cancel fee 69%
Alaska Airlines
$148 $352 No cancel fee 75%

Hourly flight availability from Seattle to Lambert-St Louis Intl

Morning 6 AM to noon 100% of SEA to STL departures
Early morning Midnight to 6 AM 0% of SEA to STL departures
Afternoon Noon to 6 PM 0% of SEA to STL departures
Evening 6 PM to midnight 0% of SEA to STL departures
Midnight
6 AM
Noon
6 PM
Weekly flight availability
from Seattle to Lambert-St Louis Intl
Sunday
2 daily flights
Monday
2 daily flights
Tuesday
2 daily flights
Wednesday
2 daily flights
Thursday
2 daily flights
Friday
2 daily flights
Saturday
1 daily flight
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