In terms of precipitation, rainfall in Knoxville ranges from 2.7 - 4.8 inches per month. March is typically the wettest month, when rainfall can reach 4.8 in. October is typically the driest time to visit Knoxville when rainfall is around 2.7 in.

If weather is an important factor for your trip to Knoxville, 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 78.8 F. Travelers looking to avoid the cold should look outside of January, when temperatures are typically at their lowest (around 39.2 F).

What is the cheapest time of day to fly from SUX to TYS?

When flying from Sioux City to Knoxville, the time of day you decide to fly out makes little to no difference towards the overall price you’ll pay on tickets.

Can I find deals for flights from Sioux City to Knoxville that include hotel bookings?

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

How can I find direct flights from Sioux City to Knoxville?

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

Can I find deals for business class flights from Sioux City to Knoxville?

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

$644+ Flights from Sioux City to Knoxville

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Cheap flight deals from Sioux City to Knoxville

Round-trip from	$644 (United Airlines)

From Sioux City Sioux Gateway to Knoxville McGhee Tyson

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Find flight deals from Sioux City to Knoxville

Cheapest flights from Sioux City to Knoxville
Explore the most affordable flight options available from Sioux City to Knoxville. Find the lowest fares from popular airlines and budget airlines, with prices last updated on July 3, 2025.

Wed 7/1610:10 amSUX - TYS

2 stops9h 47mUnited Airlines

Sun 7/205:46 pmTYS - SUX

1 stop5h 54mUnited Airlines

Deal found 7/1

$644

Best flights from Sioux City to Knoxville
Discover carefully curated flight deals from Sioux City to Knoxville that have cost, travel time, and layovers in mind to ensure you get the best travel experience. Data last updated July 3, 2025.

Wed 7/1610:10 amSUX - TYS

2 stops9h 47mUnited Airlines

Sun 7/205:46 pmTYS - SUX

1 stop5h 54mUnited Airlines

Deal found 7/1

$644

Last-minute flights from Sioux City to Knoxville
Discover last-minute flight deals from Sioux City to Knoxville. Data last updated July 3, 2025 and is based on user searches.

Wed 7/1610:10 amSUX - TYS

2 stops9h 47mUnited Airlines

Sun 7/205:46 pmTYS - SUX

1 stop5h 54mUnited Airlines

Deal found 7/1

$644

Cheapflights Fare Finder

Use the filters below to find and compare flights from Sioux City to Knoxville that are best for you.

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Route

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Price

Sioux CityKnoxville

SUX - TYS

SUXTYS

Sioux City Sioux Gateway

Wed 7/16

10:10 am-8:57 pm

2 stops9h 47m

Knoxville McGhee Tyson

Sun 7/20

5:46 pm-10:40 pm

1 stop5h 54m

$644

Flights are sorted by cheapest round-trip flights first.

Deals found on 7/1

Best time to book a flight from Sioux City to Knoxville

Have a flexible travel schedule? Discover the best time to fly to Knoxville from Sioux City 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 Sioux City to Knoxville

What is the cheapest month to book a flight from Sioux City to Knoxville?

Currently, January is the cheapest month in which you can book a flight from Sioux City to Knoxville (average of $296). Flying from Sioux City to Knoxville in March is currently the most expensive (average of $376). 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.

Reviews of airlines servicing Knoxville

Read reviews from past customers who have flown United Airlines from Sioux City to Knoxville. 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.

United Airlines

7.4

Good

8,861 reviews

Reviews

1 / 20

2.0

Mediocre

Deb,Jan 2025

MKE - ORD

It was terrible! So much to say, but in a nutshell we used vouchers from United because our last trip with them was awful with many mishaps and errors made. Unfortunately, this trip was even worse!

United Airlines

7.4

Good

8,861 reviews

United Airlines

7.4

Good

8,861 reviews

Reviews

1 / 20

2.0

Mediocre

Deb,Jan 2025

MKE - ORD

It was terrible! So much to say, but in a nutshell we used vouchers from United because our last trip with them was awful with many mishaps and errors made. Unfortunately, this trip was even worse!

Related info for your journey

Can I find deals for flights from Sioux City to Knoxville that include hotel bookings?
Yes. In addition to deals on Sioux City to Knoxville flights, Cheapflights offers vacation packages that include both flights and hotel.
How can I find direct flights from Sioux City to Knoxville?
After entering your origin and destination, apply the non-stop filter on the search result page to find direct flights from Sioux City to Knoxville.
Can I find deals for business class flights from Sioux City to Knoxville?
Yes. Cheapflights offers flight deals from Sioux City to Knoxville 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 Sioux City to Knoxville?
Currently, January is the cheapest month in which you can book a flight from Sioux City to Knoxville (average of $296). Flying from Sioux City to Knoxville in March is currently the most expensive (average of $376). 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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$644+ Cheap flights from Sioux City to Knoxville (SUX - TYS)

This is the cheapest round-trip flight price found by a Cheapflights user in the last 72 hours by searching for a flight departing on 7/16. Fares are subject to change and may not be available on all flights or dates of travel.

Find cheap flights from Sioux City to Knoxville with Cheapflights

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2. Select your favorite providers

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Cheap flight deals from Sioux City to Knoxville

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Find flight deals from Sioux City to Knoxville

Cheapest flights from Sioux City to KnoxvilleExplore the most affordable flight options available from Sioux City to Knoxville. Find the lowest fares from popular airlines and budget airlines, with prices last updated on July 3, 2025.

Explore the most affordable flight options available from Sioux City to Knoxville. Find the lowest fares from popular airlines and budget airlines, with prices last updated on July 3, 2025.

Cheapflights Fare Finder

Use the filters below to find and compare flights from Sioux City to Knoxville that are best for you.

Best time to book a flight from Sioux City to Knoxville

Have a flexible travel schedule? Discover the best time to fly to Knoxville from Sioux City with our price prediction graph.

Cheapflights Insights

Everything you need to know about your flight from Sioux City to Knoxville

What is the cheapest month to book a flight from Sioux City to Knoxville?

Reviews of airlines servicing Knoxville

Read reviews from past customers who have flown United Airlines from Sioux City to Knoxville. 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 Sioux City to Knoxville. Access travel guides, tips, and recommendations to enhance your travel experience. Get information about local attractions, weather, transportation options, and more.

Can I find deals for flights from Sioux City to Knoxville that include hotel bookings?

How can I find direct flights from Sioux City to Knoxville?

Can I find deals for business class flights from Sioux City to Knoxville?

What is the cheapest month to book a flight from Sioux City to Knoxville?

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Cheapest flights from Sioux City to Knoxville
Explore the most affordable flight options available from Sioux City to Knoxville. Find the lowest fares from popular airlines and budget airlines, with prices last updated on July 3, 2025.