Cheap flights from Seattle to St. Louis
Cheap flight deals from Seattle to St. Louis
Discover tips and strategies to find the most affordable flight options for your journey from Seattle (SEA) 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 29 July 2025.
Popular in | December |
|---|---|
Cheapest in | September |
Average price | C$ 638 |
Best time to book a flight from Seattle to St. Louis
Have a flexible travel schedule? Discover the best time to fly to St. Louis from Seattle with our price prediction graph.
Cheapflights Insights
Everything you need to know about your flight from Seattle to St. Louis
How far ahead should I book a flight from Seattle to St. Louis?
Use this chart to determine the optimal time to book a round-trip flight from Seattle to St. Louis. Price data was last updated on 25 July 2025.
The price you pay for your flight from Seattle to St. Louis may vary depending on when you book. For the best chance of a lower fare, look to book 68 days in advance of your trip. Fares are likely to increase a fortnight or so before your departure date.
What is the cheapest month to book a flight from Seattle to St. Louis?
Currently, January is the cheapest month in which you can book a flight from Seattle to St. Louis (average of C$ 365). Flying from Seattle to St. Louis in September is currently the most expensive (average of C$ 491). 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 SEA to STL?
Find hourly flight availability from Seattle 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 29 July 2025.
A simple way to save on the total cost of your ticket is to fly from Seattle to St. Louis in the afternoon. If you’re flexible enough to do this you can expect to save up to 47% on your trip compared to booking a flight in the morning.
Weekly flight availability from Seattle to St. Louis
Explore weekly flight availability from Seattle to St. Louis. Discover flights operating on different days of the week, giving you the flexibility to choose a travel day that best fits your plans. Compare info to find the most convenient option for your journey. Data last updated 29 July 2025.
The most flights from SEA to STL are scheduled on a Monday (16 on average). You will have fewer flight options on Thursday, which is when the least amount of flights are scheduled (4 on average).
Related info for your journey
Find useful and relevant information for your journey from Seattle to St. Louis. Access travel guides, tips, and recommendations to enhance your travel experience. Get information about local attractions, weather, transportation options, and more.
Travelling to a place near St. Louis?
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Complete your trip
Complete your trip to St. Louis by adding a car rental and/or hotel reservation to your travel itinerary.
Top airline flying from Seattle to St. Louis
Discover the top airline that operate flights from Seattle 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 629,999 searches. Data last updated 29 July 2025.
Fly with Cheapflights
Find the best flight deals on Cheapflights, where travelers can enjoy low prices and a wide availability of flights to their desired destinations.
How does Cheapflights help users find flights from Seattle to St. Louis?
Cheapflights helps you search for flights from Seattle to St. Louis via 900+ travel sites so you don’t have to. After performing a flight search, users can also filter their flight selection by filtering for price, number of stops, airlines, and so on.
Why should you use Cheapflights to find cheap flight tickets from Seattle to St. Louis?
Cheapflights helps you find that perfect flight to St. Louis from Seattle by searching from hundreds of airlines and agencies you know and love. We are also free to use, in case you were wondering!
Can Cheapflights find flights from Seattle to St. Louis with no change fees?
Users can book flights with no change fees policies with our dedicated filters. Book flights from Seattle to St. Louis flexibly with Cheapflights today.
Can Cheapflights notify me if prices for flights from Seattle to St. Louis become cheaper?
Yes! Start tracking prices for Seattle to St. Louis flights today and get alerted whenever prices for these flights change. To access this feature, click the bell icon next to the flight deals above, which will prompt you for a valid email address to receive your alerts.