Cheap flights from Knoxville to St. Louis from $100
This is the cheapest one-way flight price found by a momondo user in the last 72 hours by searching for a flight from Knoxville to St. Louis departing on 7/1. Fares may change, and may not be available for all flights or travel dates. Click the price to refresh the search for this deal.
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How to get the cheapest flight ticket from Knoxville to St. Louis
Look no further. We've gone through all the searches for this route on momondo so you have the important information and insights to find the cheapest flight ticket for your trip
What is the cheapest month to fly to St. Louis?
In general, July is the cheapest month to fly from Knoxville to St. Louis. Due to it being the ‘off-season’ during this time, you can expect flight prices to be around $238. The month of December is another great option to travel to St. Louis, with average flight prices from Knoxville averaging around $283.
What is the cheapest day to depart on your flight to St. Louis?
The cheapest day to depart on your flight to St. Louis is on a Wednesday when prices can be found for as low as $259. This is often the case because there is less demand to fly during this day of the week. If your travel schedule is flexible, try to avoid departing on a Monday because tickets tend to average around $539. These prices are subject to change though, so be sure to set up a Price Alert for flights to St. Louis.
What is the cheapest time of day to depart on your flight to St. Louis?
Flying to St. Louis from Knoxville at noon is the least expensive time of day to depart. momondo users have found prices as low as $265 when looking at flights departing at noon. In the morning is when there is more demand to fly to St. Louis, so prices are often more expensive at around $288 per ticket.
How have Knoxville to St. Louis flight prices changed over time?
As of June 2025, prices for Knoxville to St. Louis flights are approximately 20% cheaper when compared to flights at the same time last year.
What is the cheapest airline that flies from Knoxville McGhee Tyson to Lambert-St Louis?
Delta, American Airlines, and United Airlines are the most popular carriers operating from Knoxville McGhee Tyson to Lambert-St Louis
What airlines fly to St. Louis?
American Airlines, Delta and United Airlines are the top three most popular airlines that fly to St. Louis from Knoxville according to our data. American Airlines is the first choice among our users, with 50% of people opting to fly with this airline when traveling to St. Louis. Keep in mind that there are 4 different airlines that fly to St. Louis on a routine basis, so you have a few additional options to choose from.
When to book flights from Knoxville to St. Louis
Cheap Knoxville to St. Louis (TYS to STL) flight deals and tips
Find info about flight duration, direct flights, and airports for your flight from Knoxville to St. Louis
How far is Knoxville McGhee Tyson to Lambert-St Louis by plane?
Lambert-St Louis is 390.7 mi away from Knoxville McGhee Tyson. By plane, this route typically takes 4h 09m.
When did momondo last update prices for flights from Knoxville McGhee Tyson Airport to Lambert-St Louis Airport?
Prices for flights from Knoxville McGhee Tyson Airport to Lambert-St Louis Airport are updated daily.
How many operators does momondo search for flights from Knoxville McGhee Tyson Airport to Lambert-St Louis Airport?
There are 3 operators available for flights from Knoxville McGhee Tyson Airport to Lambert-St Louis Airport as of June 2025.
How old do you have to be to fly from Knoxville McGhee Tyson Airport to Lambert-St Louis Airport?
Although the minimum age for a child to fly alone is five, airlines that offer an unaccompanied minor (UMNR) service may have their own age limits, which could be impacted by factors such as flight length, timing, and layovers. It is recommended that you verify with the airline you are booking with for travel from Knoxville McGhee Tyson Airport to Lambert-St Louis Airport.
What documentation or ID do you need to fly to Lambert-St Louis Airport?
The required travel and health documents for your Lambert-St Louis Airport trip may vary depending on your itinerary and personal circumstances. As a general rule, you should carry multiple documents, including a national ID card or driver's license and a passport valid for six months after your intended arrival at Lambert-St Louis Airport. We recommend that you seek guidance from your airline or a reliable third party such as IATA.
What is the most popular airline from Knoxville to St. Louis?
Based on momondo bookings for this flight route, the most popular airline on flight routes from Knoxville to St. Louis is American Airlines (61% of total bookings). The next most popular airlines are Delta (28%) and United Airlines (12%).
Best airlines flying from Knoxville to St. Louis
Compare and see reviews for airlines that fly from Knoxville to St. Louis with momondo
| Airline | Rating | Free Cancellation | Price | ||
|---|---|---|---|---|---|
| PriceFrom $198 | Free Cancellation | Rating 7.2 10,000 reviews | |||
| PriceFrom $213 | Free Cancellation | Rating 7.4 8,801 reviews | |||
| PriceFrom $228 | Free Cancellation | Rating 8.0 7,963 reviews |
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Why should I use momondo to find a flight deal from Knoxville to St. Louis?
momondo compares prices from hundreds of airlines and agents so you can find and book the best deal on flights from Knoxville to St. Louis. Millions of users trust and use momondo every year so you are in good hands.
Can I find flights from Knoxville to St. Louis with flexible booking policies on momondo?
Yes. All flights to St. Louis from Knoxville on momondo can be compared and filtered by various policies on offer, including flexible booking.
How can momondo help me find flights from Knoxville to St. Louis?
momondo provides multiple filters to help you find the best flight to St. Louis from Knoxville. Filter by price, airline, airports, cabin, aircraft, payment method, number of stops and more.
I’m not ready to book a flight from Knoxville to St. Louis right now. Can momondo alert me if prices change?
If you are not ready to book a flight from Knoxville to St. Louis now, use our insights above to find helpful tips or alternatively set up a price alert, where momondo will track prices on flights to St. Louis and let you know when they change.