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St. Charles

$63+ Cheap flights from Seattle (SEA) to St. Charles, MO

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 11/18. Fares are subject to change and may not be available on all flights or dates of travel.
SEA — STL
Nov 9 — Nov 161
1 adult
Sat 11/9
Sat 11/16
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The best prices from Seattle/Tacoma Intl to St. Charles are usually found in January or February, booked 73 days in advance, depart on a Sunday or Wednesday and return on a Friday

Cheap flight deals from Seattle to St. Charles

Discover tips and strategies to find the most affordable flight options for your journey from Seattle (SEA) to St. Charles (CH5). 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 November 4, 2024.

Popular in

June

Cheapest in

January

Round-trip from

$108
(Mytrip)

One-way from

$63
(Trip.com)
High demand for flights, 20% potential price rise
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Best time to find cheap flights, 34% potential price drop
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From Seattle/Tacoma Intl to St. Charles
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One-way flight from Seattle/Tacoma Intl to St. Charles
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Find flight deals from Seattle to St. Charles

Cheapest flights from Seattle to St. Charles
Explore the most affordable flight options available from Seattle to St. Charles. Find the lowest fares from popular airlines and budget airlines, with prices last updated on November 4, 2024.

This United Airlines deal was found by Cheapflights users on 11/3. 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.
Thu 12/56:25 amSEA - STL
2 stops11h 26mUnited Airlines
Wed 12/1111:05 amSTL - SEA
1 stop10h 15mUnited Airlines
Deal found 11/3$221
This Flightnetwork deal was found by Cheapflights users on 11/3. 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 Flightnetwork is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 11/2212:10 pmSEA - STL
1 stop9h 56mFrontier
Mon 11/255:38 pmSTL - SEA
1 stop16h 41mFrontier
Deal found 11/3$223
This Trip.com deal was found by Cheapflights users on 11/3. 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 Trip.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 11/2212:10 pmSEA - STL
1 stop9h 56mMultiple Airlines
Mon 11/257:00 amSTL - SEA
Nonstop4h 33mMultiple Airlines
Deal found 11/3$224
This American Airlines deal was found by Cheapflights users on 11/3. 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.
Tue 12/1012:15 amSEA - STL
1 stop9h 11mAmerican Airlines
Sat 12/147:20 amSTL - SEA
1 stop8h 48mAmerican Airlines
Deal found 11/3$236
This Alaska Airlines deal was found by Cheapflights users on 11/3. 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.
Tue 12/107:30 amSEA - STL
Nonstop3h 54mAlaska Airlines
Tue 12/242:23 pmSTL - SEA
Nonstop4h 37mAlaska Airlines
Deal found 11/3$237
This Delta deal was found by Cheapflights users on 11/3. 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.
Mon 12/912:50 amSEA - STL
1 stop7h 50mDelta
Tue 12/243:29 pmSTL - SEA
1 stop7h 17mDelta
Deal found 11/3$267
This FareScan deal was found by Cheapflights users on 11/3. 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 FareScan is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 11/255:28 pmSEA - STL
2 stops20h 58mSpirit Airlines
Tue 12/35:21 pmSTL - SEA
2 stops23h 32mSpirit Airlines
Deal found 11/3$297
This Southwest deal was found by Cheapflights users on 11/3. 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.
Fri 12/136:00 amSEA - STL
2 stops9h 45mSouthwest
Sun 12/155:30 amSTL - SEA
1 stop6h 30mSouthwest
Deal found 11/3$341

Find flights from Seattle to St. Charles within your budget

Customize your flight search to find flights from Seattle to St. Charles 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 2,455,398 searches. Data last updated November 4, 2024.

Fly from

Any airport

Fly to

Any airport

Route

Depart

Return

Price

SeattleSt. Louis

SEA - STL

SEASTL

Seattle/Tacoma Intl

Mon 11/18

8:56 pm-11:13 pm

1 stop24h 17m

$63

SeattleSt. Louis

SEA - STL

SEASTL

Seattle/Tacoma Intl

Tue 12/10

12:15 am-11:26 am

1 stop9h 11m

$98

SeattleSt. Louis

SEA - STL

SEASTL

Seattle/Tacoma Intl

Sun 11/24

5:30 am-1:30 pm

1 stop6h 00m

$108

SeattleSt. Louis

SEA - STL

SEASTL

Seattle/Tacoma Intl

Tue 12/3

7:30 am-1:24 pm

Nonstop3h 54m

$109

SeattleSt. Louis

SEA - STL

SEASTL

Seattle/Tacoma Intl

Sat 1/25

7:00 am-10:20 pm

2 stops13h 20m

$113

SeattleSt. Louis

SEA - STL

SEASTL

Seattle/Tacoma Intl

Mon 11/18

7:45 pm-4:34 pm

2 stops18h 49m

$141

SeattleSt. Louis

SEA - STL

SEASTL

Seattle/Tacoma Intl

Wed 12/11

4:00 pm-7:55 pm

3 stops25h 55m

$157

SeattleSt. Louis

SEA - STL

SEASTL

Seattle/Tacoma Intl

Wed 12/11

1:00 pm-11:10 pm

2 stops8h 10m

$184

SeattleSt. Louis

SEA - STL

SEASTL

Seattle/Tacoma Intl

Thu 12/5

6:25 am-7:51 pm

2 stops11h 26m

Lambert-St Louis

Wed 12/11

11:05 am-7:20 pm

1 stop10h 15m

$221

SeattleSt. Louis

SEA - STL

SEASTL

Seattle/Tacoma Intl

Fri 11/22

12:10 pm-12:06 am

1 stop9h 56m

Lambert-St Louis

Mon 11/25

5:38 pm-8:19 am

1 stop16h 41m

$223

Flights are sorted by cheapest first

Deals found on 11/3

Showing 1-10 of 16 results
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Best time to book a flight from Seattle to St. Charles

Have a flexible travel schedule? Discover the best time to fly to St. Charles from Seattle 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 Seattle to St. Charles

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

How far ahead should I book a flight from Seattle to St. Charles?

Use this chart to determine the optimal time to book a round-trip flight from Seattle to St. Charles. Price data was last updated on November 1, 2024.

The best time to book flights from Seattle to St. Charles is 73 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.

Find deals

What is the cheapest month to book a flight from Seattle to St. Charles?

Currently, September is the cheapest month in which you can book a flight from Seattle to St. Charles (average of $308). Flying from Seattle to St. Charles 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 SEA to CH5?

Find hourly flight availability from Seattle to St. Charles. Discover flight options and departure times throughout the day, allowing you to choose a departure time that suits your schedule. Data last updated November 4, 2024.

Regardless of the time of day you decide to fly, the ticket price will remain around the same. Book flights from Seattle to St. Charles as you normally would.

What is the cheapest day to fly from Seattle to St. Charles?

Use this chart to determine the cheapest time to fly round-trip from Seattle to St. Charles. Price data was last updated on November 3, 2024.

Travelers seeking maximum savings on their Seattle to St. Charles flight should consider departing on Friday evenings when fares are most often at their lowest. Monday at noon flights should be avoided if possible as fares are typically the most expensive at this time.

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Weekly flight availability from Seattle to St. Charles

Explore weekly flight availability from Seattle to St. Charles. 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 November 4, 2024.

The most flights from SEA to CH5 are scheduled on a Sunday (11 on average). You will have fewer flight options on Tuesday, which is when the least amount of flights are scheduled (1 on average).

Rainfall in St. Charles by month

Plan your trip to St. Charles by taking into account the average rainfall totals by month.

In terms of precipitation, rainfall in St. Charles 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. Charles when rainfall is around 2.2 in.

Temperature in St. Charles by month

Plan your trip to St. Charles by taking into account the average temperature totals by month.

If weather is an important factor for your trip to St. Charles, 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. Charles

Get insights into the airlines that provide service to St. Charles. 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. Charles. Reviews last updated November 4, 2024.
Read through reviews of airlines operating flights from Seattle to St. Charles, such as Alaska Airlines, Spirit Airlines and Frontier. Users can see the overall rating for each airline as well as how each is rated in terms of entertainment options, comfort, food, crew/service, and boarding process.
Southwest
8.1
Very good
5,089 reviews

Entertainment

7.7

Food

7.2

Comfort

8.1

Overall

8.1

Boarding

8.3

Crew

8.7

Reviews

1 / 10

Great service throughout our flight. Easy boarding with early bird check in

Southwest
8.1
Very good
5,089 reviews
Southwest
8.1
Very good
5,089 reviews

Entertainment

7.7

Food

7.2

Comfort

8.1

Overall

8.1

Boarding

8.3

Crew

8.7

Reviews

1 / 10

Great service throughout our flight. Easy boarding with early bird check in

Alaska Airlines
8.0
Very good
9,423 reviews
Southwest
8.1
Very good
5,089 reviews

Entertainment

7.7

Food

7.2

Comfort

8.1

Overall

8.1

Boarding

8.3

Crew

8.7

Reviews

1 / 10

Great service throughout our flight. Easy boarding with early bird check in

Delta
8.0
Very good
8,829 reviews
Southwest
8.1
Very good
5,089 reviews

Entertainment

7.7

Food

7.2

Comfort

8.1

Overall

8.1

Boarding

8.3

Crew

8.7

Reviews

1 / 10

Great service throughout our flight. Easy boarding with early bird check in

United Airlines
7.4
Good
9,226 reviews
Southwest
8.1
Very good
5,089 reviews

Entertainment

7.7

Food

7.2

Comfort

8.1

Overall

8.1

Boarding

8.3

Crew

8.7

Reviews

1 / 10

Great service throughout our flight. Easy boarding with early bird check in

American Airlines
7.2
Good
10,000 reviews
Southwest
8.1
Very good
5,089 reviews

Entertainment

7.7

Food

7.2

Comfort

8.1

Overall

8.1

Boarding

8.3

Crew

8.7

Reviews

1 / 10

Great service throughout our flight. Easy boarding with early bird check in

Related info for your journey

Find useful and relevant information for your journey from Seattle to St. Charles. 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 from for flights from Seattle to St. Charles?

    If you book a flight to St. Charles from Seattle, you will be flying from Seattle/Tacoma Intl, which is the city’s only airport. Seattle/Tacoma Intl (SEA) is located 11.4 mi from the center of Seattle. There are 5 flights from Seattle/Tacoma Intl to St. Charles per day from 6 different airlines.

  • Can I find flights from Seattle to St. Charles for under $200 on Cheapflights?

    Yes, there are multiple flights from Seattle to St. Charles for under $200. The cheapest flight booked recently is on Frontier for just $108, but on average you can expect to pay $230.

  • Are there nonstop flights from Seattle to St. Charles for under $300 on Cheapflights?

    Cheapflights has at least 2 direct flights from Seattle to St. Charles under $300. A good price for a nonstop flight from Seattle to St. Charles is less than $281.

  • Are there last-minute flights available from Seattle to St. Charles for under $300?

    There are currently 8+ open flights from Seattle to St. Charles within the next 7 days for less than $300.

  • What days are nonstop flights available from Seattle to St. Charles?

    Nonstop flights can be found on the following days: Tuesday, Thursday, Friday, Saturday.

  • How popular is this Seattle to St. Charles flight route?

    This flight path from Seattle/Tacoma Intl to St. Charles was viewed by 28 users in the past month. Keep an eye out for changes in search interest prior to high and low season.

  • How many flights depart from Seattle to St. Charles on average per day?

    Travelers can expect 5 flights from Seattle to St. Charles on average per day.
    Morning (6am - Noon) - 100% of flight departures

  • How long is the flight from Seattle to St. Charles?

    Airlines like Frontier, American Airlines, and United Airlines fly from Seattle to St. Charles in about 8h 56m. The time it takes to get you to your destination can typically vary by up to 18h 58m. The distance from Seattle to St. Charles is about 1714 mi. This flight may include one or multiple stops.

  • What are the cheapest airlines to fly from Seattle to St. Charles one-way?

    To fly one-way, consider booking your trip with Frontier, which is currently one of the cheapest options available, starting at $63. Delta flights start at $98 while deals on American Airlines start at $99 one-way.

  • What are the most reliable airlines from Seattle to St. Charles?

    The top 3 most reliable airlines when flying from Seattle to St. Charles are Hawaiian Airlines (88%), American Airlines (86%) and Alaska Airlines (86%).

  • What are the cheapest flights from Seattle to St. Charles?

    On average you can expect to pay $342 for a flight from Seattle to St. Charles. The cheapest flight overall is $118 while the most popular route, (Seattle/Tacoma Intl - Lambert-St Louis) is currently priced at $130.

  • What does SEA to STL mean?

    SEA and STL are unique codes to identify airports used in the aviation industry. They are defined by IATA (International Air Transport Association) and are commonly called IATA codes. SEA to STL refers to a flight route from Seattle/Tacoma Intl Airport to Lambert-St Louis Airport. 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: Columbia Regional Airport (COU), Springfield Capital Airport (SPI), Belleville Airport (BLV), Quincy Regional Airport (UIN).

  • Can I find deals for flights from Seattle to St. Charles that include extra baggage allowance?

    The amount of baggage you can bring on your Seattle to St. Charles flight depends on the airline and the type of fare you've chosen. After entering your flight details, you'll be able to view the specific baggage policies for each deal in the search results. Keep in mind that certain deals may offer additional baggage allowance.

  • Can I find deals on flights from Seattle to St. Charles with specific airlines?

    Yes, Cheapflights allows you to browse and filter Seattle to St. Charles flight deals by airline. After entering your origin and destination, use the available filters to view flights offered by airlines.

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

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

  • How can I find direct flights from Seattle to St. Charles?

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

  • Can I find deals for business class flights from Seattle to St. Charles?

    Yes. Cheapflights offers flight deals from Seattle to St. Charles by cabin class. In addition to browsing deals, you can also filter by cabin class on the search results page after making a search.

  • Can I find deals for flights from Seattle to St. Charles that allow pets onboard?

    Many airlines flying from Seattle to St. Charles offer the option to travel with pets. After selecting a flight deal, you can find more information about the airline's pet policy on their official website or by contacting the airline directly. Please note that additional fees and restrictions may apply.

  • Can I find deals on last-minute flights from Seattle to St. Charles?

    Yes, you can often find last-minute deals on Seattle to St. Charles flights on Cheapflights. However, these deals can vary and may not always be available. We recommend checking back frequently or signing up for price alerts for the most up-to-date deals.

  • How recently were the Seattle to St. Charles flight deals updated?

    The Seattle to St. Charles flight deals you see on this page were last updated on 11/3.

  • What is the cheapest month to book a flight from Seattle to St. Charles?

    Currently, September is the cheapest month in which you can book a flight from Seattle to St. Charles (average of $308). Flying from Seattle to St. Charles 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

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Alternative routes for Seattle to St. Charles

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

Discover the top 6 airlines that operate flights from Seattle to St. Charles. 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 2,455,398 searches. Data last updated November 4, 2024.
AirlineCheapestAverageFlexibilityOn-time
FrontierCheapest$142Average$244FlexibilityNo cancel feeOn-time62%
American AirlinesCheapest$157Average$546FlexibilityNo cancel feeOn-time71%
Alaska AirlinesCheapest$198Average$401FlexibilityNo cancel feeOn-time75%
DeltaCheapest$207Average$294FlexibilityNo cancel feeOn-timeN/A
United AirlinesCheapest$216Average$348FlexibilityNo cancel feeOn-time69%
SouthwestCheapest$375Average$529FlexibilityNo cancel feeOn-time63%
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