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$100+ Cheap flights from Knoxville to St. Louis (TYS - STL)

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 6/30. Fares are subject to change and may not be available on all flights or dates of travel.
TYS — STL
Jun 17 — Jun 241
Tue 6/17
Tue 6/24
1 adult, Economy
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Cheap flight deals from Knoxville to St. Louis

Discover tips and strategies to find the most affordable flight options for your journey from Knoxville (TYS) 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 June 12, 2025.

Round-trip from

$214
(Delta)

One-way from

$100
(American Airlines)

Popular in

March

Cheapest in

July

Average price

$288
From Knoxville McGhee Tyson to Lambert-St Louis
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One-way flight from Knoxville McGhee Tyson to Lambert-St Louis
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Highest demand for flights based on searches. 16% potential increase in price ($61 potential increase over avg. RT price).
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Cheapest flight prices on average. 7% potential price decrease ($22 potential savings vs. average RT price).
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Average for round-trip flights in June 2025
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Find flight deals from Knoxville to St. Louis

Cheapest flights from Knoxville to St. Louis
Explore the most affordable flight options available from Knoxville to St. Louis. Find the lowest fares from popular airlines and budget airlines, with prices last updated on June 12, 2025.

This Delta deal was found by Cheapflights users on 6/10. 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 7/25:45 amTYS - STL
1 stop4h 30mDelta
Tue 7/87:00 amSTL - TYS
1 stop5h 51mDelta
Deal found 6/10$214
This American Airlines deal was found by Cheapflights users on 6/10. 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.
Wed 6/255:15 amTYS - STL
1 stop5h 03mAmerican Airlines
Sun 6/295:37 amSTL - TYS
1 stop6h 46mAmerican Airlines
Deal found 6/10$239
This Mytrip deal was found by Cheapflights users on 6/9. 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.
Thu 7/246:00 amTYS - STL
2 stops28h 52mMultiple Airlines
Sat 7/263:34 pmSTL - TYS
1 stop27h 30mMultiple Airlines
Deal found 6/9$290
This United Airlines deal was found by Cheapflights users on 6/11. 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.
Fri 8/155:45 amTYS - STL
2 stops11h 02mUnited Airlines
Fri 8/225:30 pmSTL - TYS
1 stop4h 06mUnited Airlines
Deal found 6/11$418

Cheapflights Fare Finder

Customize your flight search to find flights from Knoxville to St. Louis 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 June 12, 2025.
Use the filters below to find and compare flights from Knoxville to St. Louis that are best for you.

Fly from

Knoxville

Fly to

St. Louis

Route

Depart

Return

Price

KnoxvilleSt. Louis

TYS - STL

TYSSTL

Knoxville McGhee Tyson

Wed 7/2

5:45 am-9:15 am

1 stop4h 30m

Lambert-St Louis

Tue 7/8

7:00 am-1:51 pm

1 stop5h 51m

$214

KnoxvilleSt. Louis

TYS - STL

TYSSTL

Knoxville McGhee Tyson

Wed 6/25

5:15 am-9:18 am

1 stop5h 03m

Lambert-St Louis

Sun 6/29

5:37 am-1:23 pm

1 stop6h 46m

$239

KnoxvilleSt. Louis

TYS - STL

TYSSTL

Knoxville McGhee Tyson

Thu 7/24

6:00 am-9:52 am

2 stops28h 52m

Lambert-St Louis

Sat 7/26

3:34 pm-8:04 pm

1 stop27h 30m

$290

KnoxvilleSt. Louis

TYS - STL

TYSSTL

Knoxville McGhee Tyson

Fri 8/15

5:45 am-3:47 pm

2 stops11h 02m

Lambert-St Louis

Fri 8/22

5:30 pm-10:36 pm

1 stop4h 06m

$418

KnoxvilleSt. Louis

TYS - STL

TYSSTL

Knoxville McGhee Tyson

Mon 6/30

7:53 pm-11:59 pm

1 stop5h 06m

$100

KnoxvilleSt. Louis

TYS - STL

TYSSTL

Knoxville McGhee Tyson

Thu 6/26

9:04 pm-10:33 am

1 stop14h 29m

$141

KnoxvilleSt. Louis

TYS - STL

TYSSTL

Knoxville McGhee Tyson

Thu 8/21

8:36 pm-9:11 am

1 stop13h 35m

$154

KnoxvilleSt. Louis

TYS - STL

TYSSTL

Knoxville McGhee Tyson

Fri 8/22

9:55 am-11:53 pm

2 stops14h 58m

$428

Flights are sorted by cheapest round-trip flights first.

Deals found on 6/9

Best time to book a flight from Knoxville to St. Louis

Have a flexible travel schedule? Discover the best time to fly to St. Louis from Knoxville 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 Knoxville to St. Louis

What is the cheapest month to book a flight from Knoxville to St. Louis?

Currently, August is the cheapest month in which you can book a flight from Knoxville to St. Louis (average of $311). Flying from Knoxville to St. Louis 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 TYS to STL?

Find hourly flight availability from Knoxville 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 June 12, 2025.

A simple way to save on the total cost of your ticket is to fly from Knoxville to St. Louis at noon. If you’re flexible enough to do this you can expect to save up to 8% on your trip compared to booking a flight in the morning.

Rainfall in St. Louis by month

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

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

Temperature in St. Louis by month

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

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

Get insights into the airlines that provide service to St. Louis. 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. Louis. Reviews last updated June 12, 2025.
Delta
8.0
Very good
7,950 reviews

Entertainment

7.9

Boarding

8.2

Comfort

7.9

Food

7.3

Overall

8.0

Crew

8.5

Reviews

1 / 20
10.0
Excellent

Kim,May 2025

PIH - SLC

This trip was fine even with delay I had plenty of time to get connection flight!
Delta
8.0
Very good
7,950 reviews
Delta
8.0
Very good
7,950 reviews

Entertainment

7.9

Boarding

8.2

Comfort

7.9

Food

7.3

Overall

8.0

Crew

8.5

Reviews

1 / 20
10.0
Excellent

Kim,May 2025

PIH - SLC

This trip was fine even with delay I had plenty of time to get connection flight!
United Airlines
7.4
Good
8,790 reviews
Delta
8.0
Very good
7,950 reviews

Entertainment

7.9

Boarding

8.2

Comfort

7.9

Food

7.3

Overall

8.0

Crew

8.5

Reviews

1 / 20
10.0
Excellent

Kim,May 2025

PIH - SLC

This trip was fine even with delay I had plenty of time to get connection flight!
American Airlines
7.2
Good
10,000 reviews
Delta
8.0
Very good
7,950 reviews

Entertainment

7.9

Boarding

8.2

Comfort

7.9

Food

7.3

Overall

8.0

Crew

8.5

Reviews

1 / 20
10.0
Excellent

Kim,May 2025

PIH - SLC

This trip was fine even with delay I had plenty of time to get connection flight!
Frontier
5.9
Fair
3,295 reviews
Delta
8.0
Very good
7,950 reviews

Entertainment

7.9

Boarding

8.2

Comfort

7.9

Food

7.3

Overall

8.0

Crew

8.5

Reviews

1 / 20
10.0
Excellent

Kim,May 2025

PIH - SLC

This trip was fine even with delay I had plenty of time to get connection flight!

Related info for your journey

Find useful and relevant information for your journey from Knoxville to St. Louis. Access travel guides, tips, and recommendations to enhance your travel experience. Get information about local attractions, weather, transportation options, and more.

  • What are the cheapest airlines flying from Knoxville to St. Louis round-trip?

    Cheapflights users have booked flights from Knoxville to St. Louis round-trip from $214. Other airlines that can offer you cheap pricing are American Airlines, from $239, and United Airlines, from $418. These flights start at 31% lower than the current average price 3 months from now.

  • What are the cheapest airlines to fly from Knoxville to St. Louis one-way?

    For one-way options, check prices for American Airlines. According to our data, you can fly for as low as $100. Users have also found prices from $154 and $428 on Frontier and United Airlines, respectively.

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

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

  • How can I find direct flights from Knoxville to St. Louis?

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

  • Can I find deals for business class flights from Knoxville to St. Louis?

    Yes. Cheapflights offers flight deals from Knoxville to St. Louis 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 Knoxville to St. Louis?

    Currently, August is the cheapest month in which you can book a flight from Knoxville to St. Louis (average of $311). Flying from Knoxville to St. Louis 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

Traveling to a place near Knoxville?

Book flights to Knoxville if you plan to visit one of these locations
O'Fallon
Maryland Heights
Fairview Heights
Collinsville
Eureka
St. Peters
Glencoe
Festus
Alton
Farmington

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Top 3 airlines flying from Knoxville to St. Louis

Discover the top 3 airlines that operate flights from Knoxville 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 2,558,603 searches. Data last updated June 12, 2025.
AirlineCheapestAverageFlexibilityOn-time
American AirlinesCheapest$198Average$285FlexibilityNo cancel feeOn-time71%
United AirlinesCheapest$213Average$288FlexibilityNo cancel feeOn-time69%
DeltaCheapest$228Average$291FlexibilityNo cancel feeOn-timeN/A

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