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St. Charles

$109+ 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 1/22. Fares are subject to change and may not be available on all flights or dates of travel.
SEA — STL
Nov 26 — Dec 31
Tue 11/26
Tue 12/3
1 adult, Economy
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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 Wednesday or Saturday 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 21, 2024.

Popular in

June

Cheapest in

January

Round-trip from

$236
(Delta)

One-way from

$109
(Alaska Airlines)
High demand for flights, 19% 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 21, 2024.

This Delta deal was found by Cheapflights users on 11/20. 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.
Wed 12/411:05 pmSEA - STL
1 stop8h 31mDelta
Sat 12/147:20 amSTL - SEA
1 stop7h 15mDelta
Deal found 11/20$236
This American Airlines deal was found by Cheapflights users on 11/21. 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.
Mon 12/911:59 pmSEA - STL
1 stop6h 55mAmerican Airlines
Fri 12/132:29 pmSTL - SEA
1 stop7h 45mAmerican Airlines
Deal found 11/21$242
This Alaska Airlines deal was found by Cheapflights users on 11/21. 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.
Fri 12/136:06 pmSEA - STL
Nonstop3h 53mAlaska Airlines
Sat 12/147:00 amSTL - SEA
Nonstop4h 34mAlaska Airlines
Deal found 11/21$262
This CheapOair deal was found by Cheapflights users on 11/21. 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.
Tue 12/319:36 pmSEA - STL
1 stop8h 37mFrontier
Sun 1/510:09 pmSTL - SEA
1 stop17h 01mFrontier
Deal found 11/21$299
This United deal was found by Cheapflights users on 11/20. 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 is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 12/115:10 pmSEA - STL
2 stops15h 17mUnited Airlines
Sat 12/1411:05 amSTL - SEA
1 stop10h 15mUnited Airlines
Deal found 11/20$311
This Expedia deal was found by Cheapflights users on 11/20. 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 Expedia is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 12/66:06 pmSEA - STL
Nonstop3h 53mMultiple Airlines
Sun 12/88:34 pmSTL - SEA
1 stop14h 23mMultiple Airlines
Deal found 11/20$388
This Southwest deal was found by Cheapflights users on 11/20. 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 12/68:25 amSEA - STL
2 stops7h 50mSouthwest
Sun 12/88:05 pmSTL - SEA
1 stop6h 20mSouthwest
Deal found 11/20$431

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 2,612,795 searches. Data last updated November 21, 2024.

Fly from

Any airport

Fly to

Any airport

Route

Depart

Return

Price

SeattleSt. Louis

SEA - STL

SEASTL

Seattle/Tacoma Intl

Wed 12/4

11:05 pm-9:36 am

1 stop8h 31m

Lambert-St Louis

Sat 12/14

7:20 am-12:35 pm

1 stop7h 15m

$236

SeattleSt. Louis

SEA - STL

SEASTL

Seattle/Tacoma Intl

Sat 1/4

12:31 am-9:36 am

1 stop7h 05m

Lambert-St Louis

Sun 1/12

11:38 am-8:04 pm

1 stop10h 26m

$237

SeattleSt. Louis

SEA - STL

SEASTL

Seattle/Tacoma Intl

Sun 1/5

9:36 pm-8:13 am

1 stop8h 37m

Lambert-St Louis

Sun 1/12

12:15 pm-8:57 am

3 stops22h 42m

$240

SeattleSt. Louis

SEA - STL

SEASTL

Seattle/Tacoma Intl

Tue 1/21

11:59 pm-10:54 am

1 stop8h 55m

Lambert-St Louis

Thu 1/23

1:45 pm-9:20 pm

2 stops9h 35m

$255

SeattleSt. Louis

SEA - STL

SEASTL

Seattle/Tacoma Intl

Fri 3/7

8:26 am-2:25 pm

Nonstop3h 59m

Lambert-St Louis

Sun 3/9

7:00 am-9:35 am

Nonstop4h 35m

$257

SeattleSt. Louis

SEA - STL

SEASTL

Seattle/Tacoma Intl

Thu 3/6

9:37 am-9:37 am

1 stop22h 00m

Lambert-St Louis

Sun 3/9

3:53 pm-8:37 am

1 stop18h 44m

$286

SeattleSt. Louis

SEA - STL

SEASTL

Seattle/Tacoma Intl

Fri 4/4

7:35 pm-9:55 am

1 stop12h 20m

Lambert-St Louis

Sun 4/6

5:15 am-10:45 am

1 stop7h 30m

$378

SeattleSt. Louis

SEA - STL

SEASTL

Seattle/Tacoma Intl

Wed 1/22

8:00 am-1:53 pm

Nonstop3h 53m

$109

SeattleSt. Louis

SEA - STL

SEASTL

Seattle/Tacoma Intl

Thu 12/12

3:09 pm-8:13 am

1 stop15h 04m

$115

SeattleSt. Louis

SEA - STL

SEASTL

Seattle/Tacoma Intl

Tue 5/20

10:00 am-5:59 pm

1 stop5h 59m

$123

Flights are sorted by cheapest round-trip flights first.

Deals found on 11/20

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 15, 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.

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 $357). 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 21, 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 18, 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.

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 21, 2024.
Read through reviews of airlines operating flights from Seattle to St. Charles, such as Delta, American Airlines and United Airlines. 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
5,005 reviews

Entertainment

7.7

Boarding

8.2

Comfort

8.1

Crew

8.7

Overall

8.1

Food

7.2

Reviews

1 / 10

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

Southwest
8.1
Very good
5,005 reviews
Southwest
8.1
Very good
5,005 reviews

Entertainment

7.7

Boarding

8.2

Comfort

8.1

Crew

8.7

Overall

8.1

Food

7.2

Reviews

1 / 10

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

Alaska Airlines
8.0
Very good
9,464 reviews
Southwest
8.1
Very good
5,005 reviews

Entertainment

7.7

Boarding

8.2

Comfort

8.1

Crew

8.7

Overall

8.1

Food

7.2

Reviews

1 / 10

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

Delta
8.0
Very good
8,755 reviews
Southwest
8.1
Very good
5,005 reviews

Entertainment

7.7

Boarding

8.2

Comfort

8.1

Crew

8.7

Overall

8.1

Food

7.2

Reviews

1 / 10

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

United Airlines
7.4
Good
9,172 reviews
Southwest
8.1
Very good
5,005 reviews

Entertainment

7.7

Boarding

8.2

Comfort

8.1

Crew

8.7

Overall

8.1

Food

7.2

Reviews

1 / 10

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

WestJet
7.3
Good
2,811 reviews
Southwest
8.1
Very good
5,005 reviews

Entertainment

7.7

Boarding

8.2

Comfort

8.1

Crew

8.7

Overall

8.1

Food

7.2

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 2 flights from Seattle/Tacoma Intl to St. Charles per day from 6 different airlines.

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

    This flight path from Seattle/Tacoma Intl to St. Charles was viewed by 29 users in the past month. Keep an eye out for changes in search interest prior to high and low season.

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

    To fly one-way, consider booking your trip with Alaska Airlines, which is currently one of the cheapest options available, starting at $109. Frontier flights start at $115 while deals on Delta start at $123 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 American Airlines (87%), Alaska Airlines (86%) and Air Tahiti Nui (86%).

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

    On average you can expect to pay $345 for a flight from Seattle to St. Charles. The cheapest flight overall is $108 while the most popular route, (Seattle/Tacoma Intl - Lambert-St Louis) is currently priced at $178.

  • 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.

  • 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 $357). 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.

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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 2,612,795 searches. Data last updated November 21, 2024.
AirlineCheapestAverageFlexibilityOn-time
FrontierCheapest$141Average$230FlexibilityNo cancel feeOn-time62%
American AirlinesCheapest$157Average$542FlexibilityNo cancel feeOn-time71%
DeltaCheapest$206Average$301FlexibilityNo cancel feeOn-timeN/A
United AirlinesCheapest$215Average$342FlexibilityNo cancel feeOn-time69%
Alaska AirlinesCheapest$216Average$404FlexibilityNo cancel feeOn-time75%
SouthwestCheapest$375Average$529FlexibilityNo cancel feeOn-time63%
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