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

This flight path from Seattle/Tacoma Intl to St. Charles was viewed by 5 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 Frontier, which is currently one of the cheapest options available, starting at $106. Alaska Airlines flights start at $119 while deals on Delta start at $120 one-way.

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

On average you can expect to pay $530 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 $189.

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 (92%), Alaska Airlines (90%) and Hawaiian Airlines (90%).

What are the most popular airlines that fly from Seattle to St. Charles?

Before booking your flight from Seattle to St. Charles check out the most popular airlines for this route: American Airlines, Alaska Airlines or Delta.

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

To save on the cost of your flight from Seattle to St. Charles, book at least 48 days before your planned departure. Booking around this time can save you about 69% on the cost of this flight compared to booking a flight leaving this week. We have found prices from $418 if you need a flight within two weeks. For flights within the next 72 hours, you can find tickets from as low as $418.

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

Due to multiple factors, expect to potentially pay more when booking in December. For low rates, September can be a great choice for travel to St. Charles. Flights to St. Charles from Seattle in September are about $386 on average during September, but can be found for as low as $216.

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 7 flights from Seattle/Tacoma Intl to St. Charles per day from 7 different 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.

$106+ Flights from Seattle to St. Charles - Compare & Save Big

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Find cheap flights from Seattle to St. Charles 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

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Cheapflights Tip: The best prices from Seattle/Tacoma Intl to St. Charles are usually found in September or October, booked 86 days in advance, depart on a Thursday or Friday and return on a Wednesday

Cheap flight deals from Seattle to St. Charles

Most accurate provider	FlightHub 3 stars
Most trusted provider	eDreams 3 stars
Round-trip from	$208 (Frontier)
One-way from	$106 (Mytrip)
Popular in	December
Cheapest in	September
Average price	$342

Provider with most accurate pricing for Seattle/Tacoma Intl-Lambert-St Louis flight deals.

Search Deals

Provider most trusted by Cheapflights users for Seattle/Tacoma Intl-Lambert-St Louis flights.

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From Seattle/Tacoma Intl to St. Charles

Search Deals

One-way flight from Seattle/Tacoma Intl to St. Charles

Search Deals

Highest demand for flights based on searches. 7% potential increase in price ($30 potential increase over avg. RT price).

Search Deals

Cheapest flight prices on average. 1% potential price decrease ($8 potential savings vs. average RT price).

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Average for round-trip flights in April 2025

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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 April 30, 2025.

Thu 6/57:12 pmSEA - STL

1 stop12h 00mFrontier

Sat 6/78:11 pmSTL - SEA

1 stop6h 23mFrontier

Deal found 4/29

$208

Mon 6/21:10 amSEA - STL

1 stop6h 44mAmerican Airlines

Sun 6/87:45 amSTL - SEA

1 stop9h 02mAmerican Airlines

Deal found 4/29

$223

Thu 6/56:04 pmSEA - STL

Nonstop4h 00mMultiple Airlines

Sat 6/78:11 pmSTL - SEA

1 stop6h 23mMultiple Airlines

Deal found 4/29

$243

Fri 6/135:55 amSEA - STL

1 stop9h 24mDelta

Sat 6/217:15 amSTL - SEA

1 stop9h 30mDelta

Deal found 4/28

$244

Tue 10/286:00 pmSEA - STL

Nonstop3h 56mAlaska Airlines

Tue 11/42:55 pmSTL - SEA

Nonstop4h 26mAlaska Airlines

Deal found 4/28

$249

Tue 5/135:15 amSEA - STL

2 stops8h 32mUnited Airlines

Wed 5/145:20 amSTL - SEA

1 stop6h 27mUnited Airlines

Deal found 4/28

$252

Sat 6/78:45 amSEA - STL

Nonstop3h 50mSouthwest

Sun 6/156:20 pmSTL - SEA

1 stop8h 35mSouthwest

Deal found 4/28

$259

Thu 5/296:04 pmSEA - STL

Nonstop4h 00mHawaiian Airlines

Wed 6/46:18 pmSTL - SEA

Nonstop4h 27mHawaiian Airlines

Deal found 4/28

$263

Best flights from Seattle to St. Charles
Discover carefully curated flight deals from Seattle to St. Charles that have cost, travel time, and layovers in mind to ensure you get the best travel experience. Data last updated April 30, 2025.

Thu 6/57:12 pmSEA - STL

1 stop12h 00mFrontier

Sat 6/78:11 pmSTL - SEA

1 stop6h 23mFrontier

Deal found 4/29

$208

Sat 10/2512:40 amSEA - STL

1 stop6h 04mDelta

Tue 10/287:30 amSTL - SEA

1 stop9h 29mDelta

Deal found 4/29

$214

Mon 6/21:10 amSEA - STL

1 stop6h 44mAmerican Airlines

Sun 6/87:45 amSTL - SEA

1 stop9h 02mAmerican Airlines

Deal found 4/29

$223

Thu 6/56:04 pmSEA - STL

Nonstop4h 00mMultiple Airlines

Sat 6/78:11 pmSTL - SEA

1 stop6h 23mMultiple Airlines

Deal found 4/29

$243

Wed 5/286:04 pmSEA - STL

Nonstop4h 00mHawaiian Airlines

Wed 6/43:03 pmSTL - SEA

Nonstop4h 29mHawaiian Airlines

Deal found 4/29

$257

Tue 6/37:10 amSEA - STL

2 stops8h 40mSouthwest

Fri 6/67:15 pmSTL - SEA

1 stop8h 10mSouthwest

Deal found 4/28

$263

Wed 6/116:04 pmSEA - STL

Nonstop4h 00mAlaska Airlines

Wed 6/187:32 pmSTL - SEA

Nonstop4h 28mAlaska Airlines

Deal found 4/29

$283

Sat 5/178:50 amSEA - STL

1 stop5h 43mUnited Airlines

Tue 5/201:41 pmSTL - SEA

2 stops9h 50mUnited Airlines

Deal found 4/29

$309

Sun 7/138:15 amSEA - STL

1 stop9h 16mSun Country Air

Sun 7/206:05 amSTL - SEA

1 stop18h 45mSun Country Air

Deal found 4/29

$385

Last-minute flights from Seattle to St. Charles
Discover last-minute flight deals from Seattle to St. Charles. Data last updated April 30, 2025 and is based on user searches.

Mon 5/55:05 amSEA - STL

1 stop6h 25mSouthwest

Wed 5/76:05 pmSTL - SEA

1 stop6h 55mSouthwest

Deal found 4/28

$460

Mon 5/58:03 amSEA - STL

Nonstop4h 05mHawaiian Airlines

Wed 5/76:30 amSTL - SEA

Nonstop4h 24mHawaiian Airlines

Deal found 4/28

$497

Wed 5/78:03 amSEA - STL

Nonstop4h 05mMultiple Airlines

Sat 5/108:15 pmSTL - SEA

1 stop6h 29mMultiple Airlines

Deal found 4/29

$343

Thu 5/81:10 amSEA - STL

1 stop6h 44mAmerican Airlines

Mon 5/125:00 amSTL - SEA

1 stop7h 15mAmerican Airlines

Deal found 4/28

$369

Thu 5/88:03 amSEA - STL

Nonstop4h 05mAlaska Airlines

Mon 5/126:30 amSTL - SEA

Nonstop4h 24mAlaska Airlines

Deal found 4/29

$447

Thu 5/85:15 amSEA - STL

2 stops8h 32mUnited Airlines

Mon 5/126:11 pmSTL - SEA

1 stop8h 48mUnited Airlines

Deal found 4/28

$464

Fri 5/96:00 amSEA - STL

1 stop25h 59mFrontier

Mon 5/126:53 pmSTL - SEA

1 stop7h 51mFrontier

Deal found 4/29

$228

Mon 5/121:10 amSEA - STL

1 stop6h 44mAmerican Airlines

Wed 5/145:00 amSTL - SEA

1 stop7h 15mAmerican Airlines

Deal found 4/28

$247

Tue 5/136:00 amSEA - STL

1 stop25h 59mFrontier

Thu 5/159:55 pmSTL - SEA

1 stop22h 07mFrontier

Deal found 4/28

$211

Tue 5/135:15 amSEA - STL

2 stops8h 32mUnited Airlines

Wed 5/145:20 amSTL - SEA

1 stop6h 27mUnited Airlines

Deal found 4/28

$252

Fri 5/2311:50 pmSEA - STL

1 stop9h 02mDelta

Tue 5/277:30 amSTL - SEA

1 stop6h 54mDelta

Deal found 4/27

$254

Wed 5/2812:34 amSEA - STL

1 stop7h 20mAlaska Airlines

Wed 6/46:00 amSTL - SEA

1 stop8h 25mAlaska Airlines

Deal found 4/28

$373

One-way flights from Seattle to St. Charles
Search for one-way flight options from Seattle to St. Charles. Find affordable one-way fares based on user searches. Data last updated April 30, 2025.

Tue 5/66:00 amSEA - STL

1 stop25h 59mFrontier

Deal found 4/29

$106

Tue 5/276:04 pmSEA - STL

Nonstop4h 00mAlaska Airlines

Deal found 4/29

$119

Fri 6/279:58 pmSEA - STL

1 stop9h 39mDelta

Deal found 4/29

$120

Wed 7/27:34 pmSEA - STL

1 stop7h 20mUnited Airlines

Deal found 4/29

$124

Wed 6/46:00 amSEA - STL

2 stops25h 15mSpirit Airlines

Deal found 4/29

$127

Thu 9/1111:59 pmSEA - STL

1 stop8h 20mAmerican Airlines

Deal found 4/29

$130

Mon 6/26:04 pmSEA - STL

Nonstop4h 00mHawaiian Airlines

Deal found 4/29

$139

Sat 7/1210:40 pmSEA - STL

1 stop6h 35mSouthwest

Deal found 4/29

$140

Thu 7/311:59 pmSEA - STL

1 stop9h 31mSun Country Air

Deal found 4/29

$143

Mon 5/193:20 pmSEA - STL

3 stops25h 21mMultiple Airlines

Deal found 4/29

$161

Cheapflights Fare Finder

Use the filters below to find and compare flights from Seattle to St. Charles that are best for you.

Fly from

Fly to

Route

Depart

Return

Price

SeattleSt. Louis

SEA - STL

SEASTL

Seattle/Tacoma Intl

Thu 6/5

7:12 pm-9:12 am

1 stop12h 00m

Lambert-St Louis

Sat 6/7

8:11 pm-12:34 am

1 stop6h 23m

$208

SeattleSt. Louis

SEA - STL

SEASTL

Seattle/Tacoma Intl

Mon 6/2

1:10 am-9:54 am

1 stop6h 44m

Lambert-St Louis

Sun 6/8

7:45 am-2:47 pm

1 stop9h 02m

$223

SeattleSt. Louis

SEA - STL

SEASTL

Seattle/Tacoma Intl

Thu 6/5

6:04 pm-12:04 am

Nonstop4h 00m

Lambert-St Louis

Sat 6/7

8:11 pm-12:34 am

1 stop6h 23m

$243

SeattleSt. Louis

SEA - STL

SEASTL

Seattle/Tacoma Intl

Fri 6/13

5:55 am-5:19 pm

1 stop9h 24m

Lambert-St Louis

Sat 6/21

7:15 am-2:45 pm

1 stop9h 30m

$244

SeattleSt. Louis

SEA - STL

SEASTL

Seattle/Tacoma Intl

Tue 5/13

5:15 am-3:47 pm

2 stops8h 32m

Lambert-St Louis

Wed 5/14

5:20 am-9:47 am

1 stop6h 27m

$252

SeattleSt. Louis

SEA - STL

SEASTL

Seattle/Tacoma Intl

Sat 6/7

8:45 am-2:35 pm

Nonstop3h 50m

Lambert-St Louis

Sun 6/15

6:20 pm-12:55 am

1 stop8h 35m

$259

SeattleSt. Louis

SEA - STL

SEASTL

Seattle/Tacoma Intl

Thu 5/29

6:04 pm-12:04 am

Nonstop4h 00m

Lambert-St Louis

Wed 6/4

6:18 pm-8:45 pm

Nonstop4h 27m

$263

SeattleSt. Louis

SEA - STL

SEASTL

Seattle/Tacoma Intl

Fri 6/6

6:04 pm-12:04 am

Nonstop4h 00m

Lambert-St Louis

Sat 6/14

7:32 pm-10:00 pm

Nonstop4h 28m

$297

SeattleSt. Louis

SEA - STL

SEASTL

Seattle/Tacoma Intl

Tue 5/6

6:00 am-9:59 am

1 stop25h 59m

$106

SeattleSt. Louis

SEA - STL

SEASTL

Seattle/Tacoma Intl

Tue 5/27

6:04 pm-12:04 am

Nonstop4h 00m

$119

Flights are sorted by cheapest round-trip flights first.

Deals found on 4/29

Showing 1-10 of 18 results

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.

Cheapflights Insights

Everything you need to know about your flight from Seattle to St. Charles

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

The best time to book flights from Seattle to St. Charles is 86 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, August is the cheapest month in which you can book a flight from Seattle to St. Charles (average of $311). 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?

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?

Travelers seeking maximum savings on their Seattle to St. Charles flight should consider departing on Tuesday 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.

Weekly flight availability from Seattle to St. Charles

The most flights from SEA to CH5 are scheduled on a Monday (11 on average). You will have fewer flight options on Saturday, which is when the least amount of flights are scheduled (5 on average).

Rainfall in St. Charles 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

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

Read through reviews of airlines operating flights from Seattle to St. Charles, such as Alaska Airlines, Southwest and Delta. 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.

Alaska Airlines

8.0

Very good

9,961 reviews

Reviews

1 / 20

8.0

Excellent

Anonymous,Aug 2024

SEA - LAS

Seats were not that comfy especially for someone with big hips 😥

Alaska Airlines

8.0

Very good

9,961 reviews

Alaska Airlines

8.0

Very good

9,961 reviews

Reviews

1 / 20

8.0

Excellent

Anonymous,Aug 2024

SEA - LAS

Seats were not that comfy especially for someone with big hips 😥

Southwest

8.0

Very good

4,295 reviews

Alaska Airlines

8.0

Very good

9,961 reviews

Reviews

1 / 20

8.0

Excellent

Anonymous,Aug 2024

SEA - LAS

Seats were not that comfy especially for someone with big hips 😥

Delta

8.0

Very good

7,929 reviews

Alaska Airlines

8.0

Very good

9,961 reviews

Reviews

1 / 20

8.0

Excellent

Anonymous,Aug 2024

SEA - LAS

Seats were not that comfy especially for someone with big hips 😥

Hawaiian Airlines

7.9

Good

2,405 reviews

Alaska Airlines

8.0

Very good

9,961 reviews

Reviews

1 / 20

8.0

Excellent

Anonymous,Aug 2024

SEA - LAS

Seats were not that comfy especially for someone with big hips 😥

United Airlines

7.4

Good

8,696 reviews

Alaska Airlines

8.0

Very good

9,961 reviews

Reviews

1 / 20

8.0

Excellent

Anonymous,Aug 2024

SEA - LAS

Seats were not that comfy especially for someone with big hips 😥

Related info for your journey

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 7 flights from Seattle/Tacoma Intl to St. Charles per day from 7 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 5 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 Frontier, which is currently one of the cheapest options available, starting at $106. Alaska Airlines flights start at $119 while deals on Delta start at $120 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 (92%), Alaska Airlines (90%) and Hawaiian Airlines (90%).
What are the cheapest flights from Seattle to St. Charles?
On average you can expect to pay $530 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 $189.
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, August is the cheapest month in which you can book a flight from Seattle to St. Charles (average of $311). 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

Browse thousands of different options on Cheapflights for your next trip

Alternative routes for Seattle to St. Charles

Complete your trip

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Fort Leonard Wood car rentals

Top 7 airlines flying from Seattle to St. Charles

Airline	Cheapest	Average	Flexibility	On-time
Frontier	Cheapest$141	Average$244	FlexibilityNo cancel fee	On-time62%
American Airlines	Cheapest$186	Average$555	FlexibilityNo cancel fee	On-time71%
Southwest	Cheapest$188	Average$506	FlexibilityNo cancel fee	On-time63%
Delta	Cheapest$188	Average$291	FlexibilityNo cancel fee	On-timeN/A
United Airlines	Cheapest$216	Average$367	FlexibilityNo cancel fee	On-time69%
Alaska Airlines	Cheapest$236	Average$417	FlexibilityNo cancel fee	On-time75%
Hawaiian Airlines	Cheapest$237	Average$387	FlexibilityNo cancel fee	On-time85%

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$106+ 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 5/6. Fares are subject to change and may not be available on all flights or dates of travel.

Find cheap flights from Seattle to St. Charles with Cheapflights

1. Tell us where you want to go

2. Select your favorite providers

3. Compare prices and book

Cheapflights Tip: The best prices from Seattle/Tacoma Intl to St. Charles are usually found in September or October, booked 86 days in advance, depart on a Thursday or Friday and return on a Wednesday

Cheap flight deals from Seattle to St. Charles

Keep the following information in mind while searching for Seattle to St. Charles flight deals. Data was last updated April 30, 2025.

Most accurate provider

Most trusted provider

Round-trip from

One-way from

Popular in

Cheapest in

Average price

Find flight deals from Seattle to St. Charles

Cheapest flights from Seattle to St. CharlesExplore 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 April 30, 2025.

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 April 30, 2025.

Cheapflights Fare Finder

Use the filters below to find and compare flights from Seattle to St. Charles that are best for you.

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.

Cheapflights Insights

Everything you need to know about your flight from Seattle to St. Charles

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 April 25, 2025.

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

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 April 30, 2025.

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 December 16, 2024.

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 April 30, 2025.

Rainfall in St. Charles by month

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

Temperature in St. Charles by month

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

Reviews of airlines servicing St. Charles

Read through reviews of airlines operating flights from Seattle to St. Charles, such as Alaska Airlines, Southwest and Delta. 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.

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?

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

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

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

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

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

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

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

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

Browse thousands of different options on Cheapflights for your next trip

Toggle through the tabs below to find thousands of options on Cheapflights for your next trip.

Alternative routes for Seattle to St. Charles

See prices for flight routes from nearby airports that may be better suited for you.

Top 7 airlines flying from Seattle to St. Charles

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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 April 30, 2025.