$66+ Cheap flights from St. Louis to Seattle (STL - SEA)
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 3/5. Fares are subject to change and may not be available on all flights or dates of travel.
Find cheap flights from St. Louis to Seattle with Cheapflights
1. Tell us where you want to go
Enter your travel information like dates, passengers, trip type (one-way or round trip), and preferred cabin class then click “Find deals”2. Select your favorite providers
We find the providers serving your travel needs. Choose up to four travel providers to compare side-by-side for flights, hotels, or car rentals.3. Compare prices and book
Review each provider’s pricing and select the best option for you! Book through your favorite provider’s website for a seamless experience.The best prices from Lambert-St Louis to Seattle/Tacoma Intl are usually found in February or October, booked 37 days in advance, depart on a Wednesday or Thursday and return on a Thursday
Cheap flight deals from St. Louis to Seattle
Discover tips and strategies to find the most affordable flight options for your journey from St. Louis (STL) to Seattle (SEA). 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 February 6, 2025.
Most accurate provider | FlightHub 3 stars |
|---|---|
Most trusted provider | FlightHub 3 stars |
Round-trip from | $247 (Alaska Airlines) |
One-way from | $66 (CheapOair) |
Popular in | July |
Cheapest in | February |
Average price | $276 |
Good round-trip deal | $379 or less |
Good one-way deal | $260 or less |
Find flight deals from St. Louis to Seattle
Cheapest flights from St. Louis to SeattleExplore the most affordable flight options available from St. Louis to Seattle. Find the lowest fares from popular airlines and budget airlines, with prices last updated on February 6, 2025.
Explore the most affordable flight options available from St. Louis to Seattle. Find the lowest fares from popular airlines and budget airlines, with prices last updated on February 6, 2025.
This Delta deal was found by Cheapflights users on 2/6. 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.
This United Airlines deal was found by Cheapflights users on 2/5. 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.
This Orbitz deal was found by Cheapflights users on 2/4. 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.
This Alaska Airlines deal was found by Cheapflights users on 2/6. 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.
This American Airlines deal was found by Cheapflights users on 2/5. 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.
This CheapOair deal was found by Cheapflights users on 2/5. 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.
This Mytrip deal was found by Cheapflights users on 2/6. 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 Mytrip is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
This Southwest deal was found by Cheapflights users on 2/5. 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.
This Kiwi.com deal was found by Cheapflights users on 2/6. 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 Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Find flights from St. Louis to Seattle within your budget
Customize your flight search to find flights from St. Louis to Seattle 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 February 6, 2025.
Fly from
Fly to
Route
Depart
Return
Price
St. LouisSeattle
STL - SEA
STLSEA
Lambert-St Louis
Wed 4/23
3:08 pm-5:39 pm
Nonstop4h 31m
Seattle/Tacoma Intl
Tue 4/29
6:03 pm-11:59 pm
Nonstop3h 56m
St. LouisSeattle
STL - SEA
STLSEA
Lambert-St Louis
Wed 2/19
4:39 pm-9:01 pm
1 stop6h 22m
Seattle/Tacoma Intl
Sat 2/22
7:00 am-8:44 pm
2 stops11h 44m
St. LouisSeattle
STL - SEA
STLSEA
Lambert-St Louis
Thu 5/8
4:07 pm-12:44 am
1 stop10h 37m
Seattle/Tacoma Intl
Sat 5/10
8:13 am-11:55 pm
2 stops13h 42m
St. LouisSeattle
STL - SEA
STLSEA
Lambert-St Louis
Thu 2/20
5:45 am-12:43 pm
1 stop8h 58m
Seattle/Tacoma Intl
Tue 2/25
7:00 am-4:33 pm
1 stop7h 33m
St. LouisSeattle
STL - SEA
STLSEA
Lambert-St Louis
Thu 3/13
5:35 pm-11:32 pm
1 stop7h 57m
Seattle/Tacoma Intl
Wed 3/19
5:30 am-1:23 pm
1 stop5h 53m
St. LouisSeattle
STL - SEA
STLSEA
Lambert-St Louis
Thu 2/27
4:00 pm-12:25 am
3 stops34h 25m
Seattle/Tacoma Intl
Wed 3/5
7:57 pm-4:42 pm
3 stops18h 45m
St. LouisSeattle
STL - SEA
STLSEA
Lambert-St Louis
Fri 3/7
2:00 pm-11:50 pm
1 stop11h 50m
Seattle/Tacoma Intl
Sat 3/15
7:05 pm-9:55 am
1 stop12h 50m
St. LouisSeattle
STL - SEA
STLSEA
Lambert-St Louis
Sat 5/10
6:53 pm-12:44 am
1 stop7h 51m
Seattle/Tacoma Intl
Sun 5/18
6:00 am-9:09 am
1 stop25h 09m
St. LouisSeattle
STL - SEA
STLSEA
Lambert-St Louis
Wed 3/5
7:04 pm-12:02 pm
1 stop18h 58m
St. LouisSeattle
STL - SEA
STLSEA
Lambert-St Louis
Tue 5/6
6:05 pm-11:00 pm
1 stop6h 55m
Compare providers for flights from St. Louis to Seattle
Provider information is updated monthly. Please note that these providers often have deals for this flight, but the availability may vary on a day-by-day basis on Cheapflights.
Use the table below to compare price accuracy, trust ratings, and cancellation policies for each provider offering flight deals from St. Louis to Seattle in February.
| Provider | Price Accuracy | Trust Score* |
|---|---|---|
| Price Accuracy1 star | Trust Score*3 stars | |
| Price Accuracy3 stars | Trust Score*3 stars | |
| Price Accuracy3 stars | Trust Score*3 stars | |
| Price Accuracy3 stars | Trust Score*2 stars | |
| Price Accuracy3 stars | Trust Score*1 star | |
| Price Accuracy3 stars | Trust Score*2 stars | |
| Price Accuracy- | Trust Score*3 stars | |
| Price Accuracy3 stars | Trust Score*3 stars |
- Most accurate provider: When it comes to deals on St. Louis-Seattle flights, users find the pricing of FlightHub to be most consistent on Cheapflights vs. FlightHub Users can find the same prices on St. Louis-Seattle flight deals on Cheapflights vs. FlightHub >95% of the time. Price accuracy is based on data collected from St. Louis-Seattle flight searches over the past month and is updated monthly.
- Most trusted provider: When it comes to deals on St. Louis-Seattle flights, Cheapflights users trust FlightHub the most. FlightHub has received a user feedback score of 3 out of 3 stars (3 being the best), meaning they have been trusted the most by Cheapflights users looking for St. Louis-Seattle flight deals. Provider user feedback score is based on Cheapflights searches over the past month and is updated monthly.
Best time to book a flight from St. Louis to Seattle
Have a flexible travel schedule? Discover the best time to fly to Seattle from St. Louis with our price prediction graph.
Travel insights for flights from St. Louis to Seattle
Get recent, data-driven insights about flights from St. Louis to Seattle including ideal travel times, pricing trends, and more.
How far ahead should I book a flight from St. Louis to Seattle?
Use this chart to determine the optimal time to book a round-trip flight from St. Louis to Seattle. Price data was last updated on January 31, 2025.
The best time to book flights from St. Louis to Seattle is 36 days before your desired departure date. The cost of your flight will likely increase significantly if you book two weeks in advance of your flight.
What is the cheapest month to book a flight from St. Louis to Seattle?
Currently, January is the cheapest month in which you can book a flight from St. Louis to Seattle (average of $238). Flying from St. Louis to Seattle in July is currently the most expensive (average of $411). 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 STL to SEA?
Find hourly flight availability from St. Louis to Seattle. Discover flight options and departure times throughout the day, allowing you to choose a departure time that suits your schedule. Data last updated February 6, 2025.
Unlike in the morning, when flights are generally more expensive, you can save up to 12% on flights from St. Louis to Seattle by exploring options for tickets in the afternoon.
What is the cheapest day to fly from St. Louis to Seattle?
Use this chart to determine the cheapest time to fly round-trip from St. Louis to Seattle. Price data was last updated on February 2, 2025.
Travelers seeking maximum savings on their St. Louis to Seattle flight should consider departing on Thursday afternoons when fares are most often at their lowest. Saturday mornings flights should be avoided if possible as fares are typically the most expensive at this time.
Rainfall in Seattle by month
Plan your trip to Seattle by taking into account the average rainfall totals by month.
In terms of precipitation, rainfall in Seattle ranges from 0.7 - 6.6 inches per month. November is typically the wettest month, when rainfall can reach 6.6 in. July is typically the driest time to visit Seattle when rainfall is around 0.7 in.
Temperature in Seattle by month
Plan your trip to Seattle by taking into account the average temperature totals by month.
If weather is an important factor for your trip to Seattle, 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 66.2 F. Travelers looking to avoid the cold should look outside of December, when temperatures are typically at their lowest (around 41.0 F).
Reviews of airlines servicing Seattle
Get insights into the airlines that provide service to Seattle. 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 Seattle. Reviews last updated February 6, 2025.
See what other customers who have flown with Southwest, Alaska Airlines and Delta from St. Louis to Seattle have to say. Users have also rated airlines in terms of entertainment options, comfort, food, crew/service, and boarding process.
Crew
Boarding
Comfort
Food
Overall
Entertainment
Reviews
Lauren,Dec 2024
MCI - DCA
Crew
Boarding
Comfort
Food
Overall
Entertainment
Reviews
Lauren,Dec 2024
MCI - DCA