TYS - DEN

$58 Find Cheap Flights from Knoxville to Denver

This is the cheapest one-way flight price found by a KAYAK user in the last 72 hours by searching for a flight from Knoxville to Denver departing on 12/14. Fares are subject to change and may not be available on all flights or dates of travel. Click the price to replicate the search for this deal.
1 adult
1 adult, Economy

KAYAK searches hundreds of travel sites at once for deals on flights to Denver

 
These are the airlines KAYAK users have selected most often from within our search results in flight searches from Knoxville to Denver, as well as popular online travel agencies
These are the airlines KAYAK users have selected most often from within our search results in flight searches from Knoxville to Denver, as well as popular online travel agencies
Travelers love KAYAK
41,299,237 searches in the past 7 days on KAYAK

Save 22% or moreCompare multiple travel sites with one search.

Track pricesNot ready to book? Create a price alert for when prices drop.

Bundle and saveSave money when you bundle your flight + hotel.

Filter your dealsChoose cabin class, free Wi-Fi and more.

Flight Deals
Expert advice
Booking Insights
Flight Deals

Cheap Flights from Knoxville to Denver (TYS-DEN)

 
Here are some of the best deals found on KAYAK recently from the most popular airlines for round-trip flights from Knoxville to Denver that are departing in the next months. While these flights were available on KAYAK in the last 72 hours, prices and availability are subject to change and deals may expire.
Discover the best prices for you by selecting your travel dates on KAYAK.

Recent round-trip flight deals from Knoxville to Denver

Thu, Oct 30 - Sun, Nov 2
Allegiant Air Logo
7:00 am - 8:04 amTYS-DEN
3h 04mnonstop
Allegiant Air Logo
8:54 am - 1:33 pmDEN-TYS
2h 39mnonstop
$110Allegiant Air
Find Deal
Thu, Nov 6 - Sun, Nov 9
Frontier Logo
7:17 pm - 8:34 pmTYS-DEN
3h 17mnonstop
Frontier Logo
1:36 pm - 6:22 pmDEN-TYS
2h 46mnonstop
$112Frontier
Find Deal
Thu, Oct 16 - Sun, Oct 19
Frontier Logo
8:17 pm - 9:39 pmTYS-DEN
3h 22mnonstop
Frontier Logo
2:43 pm - 7:32 pmDEN-TYS
2h 49mnonstop
$113Frontier
Find Deal
Fri, Oct 24 - Mon, Oct 27
Frontier Logo
8:17 pm - 9:39 pmTYS-DEN
3h 22mnonstop
Frontier Logo
2:43 pm - 7:32 pmDEN-TYS
2h 49mnonstop
$117Frontier
Find Deal
Mon, Sep 29 - Thu, Oct 2
Multiple Airlines Logo
8:35 pm - 9:44 pmTYS-DEN
3h 09mnonstop
Multiple Airlines Logo
8:54 am - 1:33 pmDEN-TYS
2h 39mnonstop
$127Multiple Airlines
Find Deal
Fri, Oct 17 - Mon, Oct 20
Frontier Logo
8:17 pm - 9:39 pmTYS-DEN
3h 22mnonstop
Frontier Logo
2:43 pm - 7:32 pmDEN-TYS
2h 49mnonstop
$130Frontier
Find Deal
Sun, Sep 28 - Mon, Sep 29
Frontier Logo
5:08 pm - 6:15 pmTYS-DEN
3h 07mnonstop
Frontier Logo
2:59 pm - 7:45 pmDEN-TYS
2h 46mnonstop
$133Frontier
Find Deal
Thu, Dec 11 - Sun, Dec 14
Allegiant Air Logo
6:30 am - 7:43 amTYS-DEN
3h 13mnonstop
Allegiant Air Logo
8:33 am - 1:11 pmDEN-TYS
2h 38mnonstop
$149Allegiant Air
Find Deal
Wed, Oct 29 - Mon, Nov 3
American Airlines Logo
3:49 pm - 7:34 pmTYS-DEN
5h 45m1 stop
American Airlines Logo
11:59 pm - 9:50 amDEN-TYS
7h 51m1 stop
$219American Airlines
Find Deal
Wed, Oct 15 - Tue, Oct 21
United Airlines Logo
4:40 pm - 5:53 pmTYS-DEN
3h 13mnonstop
United Airlines Logo
10:15 am - 3:06 pmDEN-TYS
2h 51mnonstop
$229United Airlines
Find Deal

Everything you should know

Our travelers' advice
AI-generated summary based on content written by travel experts
Frontier's Economy Bundle includes carry-on and seat choice.
Allegiant's Bonus bundle adds ticket flexibility and convenience.
Expert advice
Expert advice
Expert advice
Expert advice
Top airlines
Allegiant Air
Cheapest • from $110 (round-trip)
Delta
Best reviews • 7.9 score
Airline reviews
Airline reviews
+1
+1
Airline reviews
Airline reviews
+1
Video guide: How to find cheap flights to Denver
Watch video
Watch video
Watch video
Watch video
When to book
2 weeks
in advance
Our data shows that travelers who book at least 2 weeks in advance save around 33% compared to booking last minute.
Insights
Insights
Insights
Insights
When to travel
January
Cheapest • 9% price drop
June
Most popular
Good to know
Good to know
+1
+1
Good to know
Good to know
+1
Cheapest round-trip
$110
Overall average: $238
Allegiant Air
Thu 10/30Sun 11/2
TYS - DEN • Non-stop
Cheapest one-way
$58
Typical prices: $141-300
Allegiant Air
Sun 12/14
TYS - DEN • Non-stop
Start a new search
KAYAK searches 100s of sites at once to find you the best travel deals.
We hope you love your trip to Denver!
Expert advice

Expert advice for your flight from Knoxville to Denver

 
Snippets provided in this section are AI-generated based on a summarization of KAYAK-commissioned articles. The articles are presented as-is, for general informational purposes only, and may not be up-to-date. The opinions contained in the articles are original to the author and reflect their authentic experience, which may vary significantly from the experience of others.
KAYAK teamed up with top travel experts to share the best tips for your journey.
Airlines
United Airlines

United's Economy Plus offers six inches more legroom, enhancing comfort on medium-haul flights.


United's Wi-Fi offers free messaging; check coverage before purchasing for streaming.

Allegiant Air

Allegiant's Bonus bundle includes carry-on, seat selection, and ticket flexibility, enhancing travel convenience.


Allegiant's Legroom+ offers extra space and faster deplaning, perfect for budget-conscious travelers.

Frontier

Frontier's Economy Bundle includes a carry-on and seat choice, ideal for budget travelers.


Frontier's Premium Bundle offers extra legroom and priority boarding for just $20 more.

Read more about Frontierby Stefanie Waldek
Our travel experts
Stefanie Waldek

Stefanie Waldek

Expert on United Airlines and Frontier

Stefanie Waldek

Stefanie Waldek

Stefanie Waldek is a freelance space, travel, and design writer based in Saratoga Springs, NY. Her words have appeared in Space.com, Travel + Leisure, Condé Nast Traveler, Architectural Digest, and House Beautiful, among other publications. An expert in aviation and expedition cruising, Stefanie is frequently up in the air or on the sea, likely en route to Antarctica or the Arctic.

Read more
Daniel Scheffler

Daniel Scheffler

Expert on Allegiant Air

Daniel Scheffler

Daniel Scheffler

Daniel Scheffler is a travel writer, podcaster, and producer. Born in Africa, bred in Europe and now living in America he has traveled to 140 countries (and all 50 U.S. states). Plus he has stayed at over 2500 hotels across the globe. His original shows Everywhere and Without Maps (available on Spotify) showcase his beliefs, travel is about humanity and sharing that beauty. And thus it reminds you that you shouldn’t believe everything you think.

Read more
Booking Insights

KAYAK's insights & trends for Knoxville to Denver flights

Get data-powered insights and trends into flights from Knoxville to Denver to help you find the cheapest flights, the best time to fly and much more.

Find cheap flights to Denver
Find cheap flights to Denver

Planning a trip from Knoxville to Denver? KAYAK’s data-powered insights will help you find cheap flights. Learn the best time to fly, how early to book your ticket, and other tips to secure great prices.

What’s the cheapest day of the week to fly from Knoxville to Denver?

The average price of all round-trip flights from Knoxville to Denver clicked on KAYAK for each day over the last 12 months.

Your flight ticket price will generally be cheaper if you fly to Denver on a Thursday and more expensive on a Monday. On your return trip to Knoxville, you should consider flying back on a Thursday, and avoid Mondays for better deals.

What is the cheapest month to fly from Knoxville to Denver?

To calculate monthly average prices, KAYAK takes all prices for each month over the last year for round-trip flights from Knoxville to Denver, removes the top 0.1% to account for outliers, and then takes the median of all values for each month.

The cheapest month for flights from Knoxville to Denver is January, where tickets cost $233 (return) on average. On the other hand, the most expensive months are December and July, where the average cost of round-trip tickets is $332 and $290 respectively.

How far in advance should I book a flight from Knoxville to Denver?

To calculate weekly average prices, KAYAK takes all prices for each week before departure over the last year for round-trip flights from Knoxville to Denver, removes the top 0.1% to account for outliers, and then takes the average of all the values for each week.

To get a below average price on the flight from Knoxville to Denver, you should book around 2 weeks before departure, which saves you about 33% compared to booking last minute. For the absolute cheapest price, our data suggests you should book 9 weeks before departure.

Good to know

Low seasonApril
Cheapest flight$58
Best time to beat the crowds with an average 4% drop in price.
Most popular time to fly and prices are also 1% lower on average.
Flight from Knoxville to Denver

When to book flights from Knoxville to Denver

Are your dates flexible? Find out the best times to travel from Knoxville to Denver based on our flight data from the last year. Discover the cheapest month and even day to fly.
Estimated round-trip price
KAYAK looks at all historical flight data for each date to provide a predicted price for one-way trips or round-trips with a duration up to 40 days. While we try to provide actual minimum prices for each date, some prices are predictions and actual prices may differ.

FAQs for booking flights from Knoxville to Denver

  • Where can I sleep at Denver International Airport?

    If you wish to stay at the airport, book a stay at the Westin Hotel at Denver International Airport. The establishment is on the upper level of the Jeppesen Terminal. It offers fitness facilities, an indoor pool, and multiple dining options. They offer day rooms, overnight stays, and DEN airport train connections.

  • Does McGhee Tyson Airport offer accessible services?

    DEN offers ramps and elevators for barrier-free access. PRM also has accessible restrooms, reserved parking spots, and accessible means of public transport. They can also request wheelchair assistance at DEN through their airline. Hard-of-hearing passengers traveling through will have TDD telephones and visual paging services, while low-vision passengers get Aira services and braille signage.

  • What are the transport options from Denver International Airport?

    DEN is served by Regional Transportation (RTD) trains and buses, and you can get affordable public transportation downtown. Bus routes AT, 145X, AA, AB, and 169L are available at the DEN Airport station, and these services are offered every 15min. RTD Line A train provides services between DEN and downtown, and the trains are available every 15-30min. Several companies also offer charter buses from DEN to the neighboring cities in Colorado. These buses are pre-booked, and you can get more information on your bus at the ground transportation desk. Taxis are available curbside, offering a flat rate downtown and metered rates for other Denver destinations.

  • Which airlines have lounges at Denver International Airport?

    Delta, American Airlines, and United Airlines have lounges at DEN. Delta runs a members-only lounge, but you can pay at the door to access the AA and United lounges. The Delta Sky Club is on Concourse A airside, near the Center Core. The American Airlines lounge is on Concourse A airside, on the north end of the A Gates. United Club has two locations, one in each airport wing (west and east).

  • What is the cheapest flight from Knoxville to Denver?

    In the last 3 days, the lowest price for a flight from Knoxville to Denver was $58 for a one-way ticket and $110 for a round-trip.

  • Do I need a passport to fly between Knoxville and Denver?

    No, a passport isn't needed to fly from Knoxville to Denver. However, local authorities might ask for an official ID.

  • Which airlines offer Wi-Fi service onboard planes from Knoxville to Denver?

    American Airlines, and Delta offer inflight Wi-Fi service on the Knoxville to Denver flight route.

  • Which aircraft models fly most regularly from Knoxville to Denver?

    The Embraer 175 (Enhanced Winglets) is the aircraft model that flies most regularly on the Knoxville to Denver flight route.

  • Which airline alliances offer flights from Knoxville to Denver?

    Star Alliance is the only airline alliance operating flights between Knoxville and Denver.

  • On which days can I fly direct from Knoxville to Denver?

    There are nonstop flights from Knoxville to Denver on a daily basis.

  • Which is the best airline for flights from Knoxville to Denver, Delta or United Airlines?

    The two airlines most popular with KAYAK users for flights from Knoxville to Denver are Delta and United Airlines. With an average price for the route of $309 and an overall rating of 7.9, Delta is the most popular choice. United Airlines is also a great choice for the route, with an average price of $416 and an overall rating of 7.4.

  • How does KAYAK find such low prices on flights from Knoxville to Denver?

    KAYAK is a travel search engine. That means we look across the web to find the best prices we can find for our users. With over 2 billion flight queries processed yearly, we are able to display a variety of prices and options on flights from Knoxville to Denver.

  • How does KAYAK's flight Price Forecast tool help me choose the right time to buy my flight ticket from Knoxville to Denver?

    KAYAK’s flight Price Forecast tool uses historical data to determine whether the price for a flight to Denver from Knoxville is likely to change within 7 days, so travelers know whether to wait or book now.

  • What is the Hacker Fare option on flights from Knoxville to Denver?

    Hacker Fares allow you to combine one-way tickets in order to save you money over a traditional round-trip ticket. You could then fly to Denver with an airline and back to Knoxville with another airline. Booking your flights between Knoxville and DEN can sometimes prove cheaper using this method.

  • What is KAYAK's "flexible dates" feature and why should I care when looking for a flight from Knoxville to Denver?

    Sometimes travel dates aren't set in stone. If your preferred travel dates have some wiggle room, flexible dates will show you all the options when flying to Denver from Knoxville up to 3 days before/after your preferred dates. You can then pick the flights that suit you best.

KAYAK’s top tips for finding a cheap flight from Knoxville to Denver

  • Looking for a cheap flight? 25% of our users found flights on this route for $99 or less one-way and $232 or less round-trip.
  • Denver International Airport (DEN) has the hub and spoke layout, the Jeppesen Terminal serving as the hub to three Concourses A, B, and C. The airport has provided an underground train running every 5min for transport through the airport complex.
  • McGhee Tyson Airport (TYS) welcomes pets to their facility, providing a pet relief area to accommodate them. The relief area is located outdoors, on the lower level of the terminal building, just in front of the Airport Hilton.
  • Public Service Credit Union has a full-service branch operating in the Jeppesen Terminal at DEN if you're looking for banking services at the destination airport. The bank is landside on Level 6 West and is operational from 9 am to 6 pm on weekdays.
  • Unwind with a massage after your flight at the A Massage spa at DEN. They offer express table and chair massage services at their three locations. You'll find them at the Center Core, A Gates, and B Gates. XpresSpa also offers its services at DEN. XpresSpa has two C Gate locations and one at the Center Core.
  • Around 759 kg of carbon is emitted on flights from Knoxville to Denver. However, book your flight with Allegiant Air if you wish to fly sustainably. They offer a flight that emits 49% less carbon per passenger on this route.

Prefer to fly direct from Knoxville to Denver?

 
Direct data is based off flight results for the next 60 days. Find direct flights from all airlines flying direct from Knoxville McGhee Tyson to Denver Intl.
Find which airlines fly direct from Knoxville McGhee Tyson Airport to Denver Intl Airport, which days they fly and book direct flights.

Direct departures

Knoxville McGhee Tyson to Denver Intl

Monday

Frontier, United Airlines

Frontier, United Airlines

Tuesday

United Airlines, Allegiant Air, Frontier

United Airlines, Allegiant Air, +1 more

Wednesday

United Airlines

United Airlines

Thursday

Allegiant Air, Frontier, United Airlines

Allegiant Air, Frontier, +1 more

Friday

Frontier, United Airlines

Frontier, United Airlines

Saturday

United Airlines, Allegiant Air, Frontier

United Airlines, Allegiant Air, +1 more

Sunday

Allegiant Air, Frontier, United Airlines

Allegiant Air, Frontier, +1 more

See more direct flights

Direct returns

Denver Intl to Knoxville McGhee Tyson

Monday

Frontier, United Airlines

Frontier, United Airlines

Tuesday

United Airlines, Allegiant Air, Frontier

United Airlines, Allegiant Air, +1 more

Wednesday

United Airlines

United Airlines

Thursday

Allegiant Air, Frontier, United Airlines

Allegiant Air, Frontier, +1 more

Friday

Frontier, United Airlines

Frontier, United Airlines

Saturday

United Airlines, Allegiant Air, Frontier

United Airlines, Allegiant Air, +1 more

Sunday

Allegiant Air, Frontier, United Airlines

Allegiant Air, Frontier, +1 more

See more direct flights

Reviews of the top 5 airlines serving from Knoxville to Denver

 
See real verified KAYAK customer reviews for airlines flying from Knoxville to Denver. Airline scores are aggregated from all reviews left by passengers on KAYAK after flying with an airline. KAYAK doesn’t show reviews that are older than 5 years. Learn how KAYAK collects reviews.
Need help choosing which airline to fly with from Knoxville to Denver? KAYAK airline reviews give an overall score for each airline based on loads of factors, including comfort, boarding, in-flight entertainment and more, to make your decision easier. See airline scores according to verified KAYAK customer reviews.
7.9
DeltaOverall score based on 7954 reviews
8.2Boarding
8.5Crew
7.9Entertainment
7.3Food
7.9Comfort
Airline reviews

Perfect flight both ways. On time, courteous staff, plane comfortable and cool. Best domestic flights I’ve had in awhile.

10.0 ExcellentAnonymous, Sep 2025CLT - BOS
Read more Delta reviews

Perfect flight both ways. On time, courteous staff, plane comfortable and cool. Best domestic flights I’ve had in awhile.

Really low quality food especially for an international flight. The crew also was surprisingly unpleasant except couple of ladies. I know we were not in first class but that’s no reason to treat customers as less.

Flight delayed for two and half hours and then canceled altogether due to mechanical issues. No mechanic onsite to fix so had to send one from LAX.

Crew was good. The reservation got mixed up and they didn't have my TSA number. I am also a Silver Medallion and wasn't able to use Sky Priority.

Delta made it easy, comfortable and timely. The crew was fantastic.

This route with Delta always has delays or is cancelled. Aircrafts seem smaller and older. I fly Delta quite a bit - haven’t had issues with the international flights. But this route has always been the troublesome one

Three seats in first class were broken and while they were able to still acommodate us it was looking very touch and go and they had others they could not acommodate

Mechanic delay in addition to a 2 hour change in takeoff time was frustrating.

Delayed due to thunderstorms and no in-flight service due to rough weather — both of which are out of Delta’s control. Flight was good overall.

The flight attendants in SLC were rude. I arrived 40 minutes early to gate. Ticket said I needed check in for seat assignments and tried check in and attendants said they weren’t doing it. And proceeded to never call me to give me a ticket so when time to board I received the very last seat. Please relay to employees to do their job better..,

I understand stuff happens, but plane failures are likely due to lack of maintenance. Additionally, air conditioning wasn't working, no snack/drink service, no WiFi. Fortunately, the crew was communicative and light-hearted. United grabbed another plane and we were able to get to our destination.

Had to cancel first flight because Airporter Bus took over 3 hrs to get to airport which resulted in an extra $378 dollar fare . Is there anyway I can be reimbursed for initial fare since it was not my fault? Sent from my iPhone EJ Ledet

Excellent flight. Boarding was efficient and departure was on time. Smooth flight with on time arrival. Deplaning was also efficient.

Our flight was understandably diverted to a small regional airport in Laramie, Wyoming due to weather conditions, which I fully recognize and appreciate. However, the low rating stems from the experience that followed: passengers remained on board for over an hour without the option to deplane and stretch, despite the aircraft being stationary. Although the pilot opened the cabin door, only he was permitted to exit. Meanwhile, passengers grew increasingly uncomfortable as warm summer air entered the cabin through the open door, and being in the second row meant we were impacted immediately. While the flight attendants made efforts to keep everyone at ease, I believe allowing passengers to deplane briefly, given the extended delay, would have significantly improved the overall experience.

I never flew. Flight was canceled. DIA worst airport in the country. Avoid at all costs.

Very rough getting into denver. my kid threw up it was so rough.

Why wasn't this flight departure scheduled eith another crew so that it could leave on time? When we arrived in Denver we had so little time between flights we had run to the connecting flight. We should received some credit for the inconvenience.

I was supposed to be on business class at first class from Denver back to Miami due to weather changes. I missed my connection and it’s put on a flight to Fort Lauderdale. Instead of honoring my business class/1st class ticket, they put me in coach, but there were two first class seats open. I think it’s absolutely disgusting that I paid for first class $1300 ticket and they put me in economy and they had to open seats available and I have still not been refunded the difference. I ended up having to eat a snack box instead of the meal I was supposed to get and did not get home till 2 AM so I think that’s a little pathetic that I had to live off crackers for dinner And my poor dog ate some cheese and salami. Oh yes, apparently when they switched me to the new flight they forgot to mention I had a service dog

Excellent service despite turbulence during the flight. Flight attendants were remarkable!

Flight attendant moved my bag without notifying me and was rude to me when I asked him about it. There was no reason to move it.

Given it’s a red-eye into Charolotte, we didn’t get any food. The survey does not include “N/A” so the rating will be skewed.

Great. Quick and quiet and east. The breakfast choices were a welcome surprise!

American airlines suck they delay the flights all the time made me sleep in an airport because my flight was delayed and I miss my connecting flight

There's nothing I liked about it. For first off I scheduled this trip two weeks in advance then they delayed my flight which messed up my whole trip. So I scheduled it for the following weekend thinking there won't be a delay and guess what as soon as I got to the airport we said in the airplane on the tarmac for an hour and a half. Not only was it delayed I missed my connecting flight meaning I had to stay the night at Dallas-Fort Worth airport sleeping on the floor. I will tell you this I will never fly American airlines ever again I have had nothing but horrible experience with them and I just throw money at them

The stewardess hit me with the food kart twice on the head and didn't say I'm sorry once. The same stewardess gave me a warm Apple Juice with No ice. The Flight was delayed for Departure 6 times, starting from 2:36pm, finally taking off 7:50pm. I was late picking up my child from the sitter by 3 hours.

Having to reschedule flights a day later, they loaded by luggage on the wrong plane from Little rock now I have to HOPE they deliver it to where im staying like they said would. International flight crew was very disgruntled and not very friendly.

We will be writing a long, detailed letter to corporate about our awful experience with American airlines.

It took way too long to diagnose and solve the problem of a broken crew member cabin seat. Though compensation for the volunteer who left the flight was very kind.

The entertainment package was vast and the selections were very current. Keep updating it was great.

The seat was so hard my tailbone was aching The crew was kind of a b**** because I made a joke that I didn't care if they close the door I total c*** when she was trying to f****** act like she was mad at me because I said that The flight was bumpy. Sure you didnt have control over that.

Crew was great. No entertainment and food and beverage was for purchase only, even water

It was canceled. The flight wasn’t rescheduled, everyone had to figure out their own new arrangements. They said we would get refunded our original fare and receive an additional $150. We received links for $100 only and they expired before we could activate them.

The plane had originated in Las Vegas at 6:30 in the morning and flew to Moline where we boarded. The flight left around 12:30 PM and there were no boxed snacks available and many of the alcoholic beverages were unavailable. I would find it hard to believe that that many of the passengers coming from Las Vegas at 6:30 in the morning, drank and ate that much of the items. I can only come to the conclusion that someone failed to stock the plane for the round-trip. This is a huge revenue failure for the airline and disappointment for the passengers. The flight crew did not seem happy to be there and did not engage with passengers. Allegiant you can do better.

They did not let my husband on the plane with our service animal at the last minute. Do NOT fly this airline with a service animal!

Tight! Seats are not designed for those of us who wear extra-large clothes.

The non-stop flight from Grand Rapids was excellent. I neither expected or needed a budget flight and Allegiant made the trip easy and for an affordable price, Arriving at the Mesa Airport (AZA) is a delight compared to the international airport. For our return flight, we were able to arrive 75 minutes before the flight, return the rental car, check our bag and make it to the gate in plenty of time. That would never happen at most airports.

Easiest flights I’ve ever taken. Plane was comfortable without overly crowded seating.

Terrible. Still have not received the refund from them. They sent it to some account that I don't even know. Spoke with costumer service and they are unable to help.

I didn’t like it at all. I miss my second flight because of the delay on Allegiant Air now I m stuck in MCO.

Good, but a bit late on take off after loading. Don't like charging for carry ons!

Seats were new and comfortable. Staff was fine. Missed my connection due to weather -which wasn’t their fault- but got no help at all. Gate staff sent me to customer service, which was and stayed unstaffed. Sign with QR code directed me to call or chat. Chat was useless. Call was returned after an hour. No itinerary offered by Frontier could get me home in less than 30 hours. Rebooked with another airline and got a partial refund that came to about 10 percent of what I paid to get home.

The experience was good. No frills but I got there safe and sound and on time.

As every law enforcement agency I could imagine surrounded the plane and we didn’t disembark for 2 hours and then had to stick around for another hour to go get our personal belongings after leaving them behind and being bused away from the plane, it was scary and inconvenient. We were given no information as to why this was happening. Lack of communication with passengers was disappointing.

Frontier Airlines was AWFUL. I was an hour early for my flight and the lady refused to check me in. I had to purchase a whole new ticket with a different airline.

Late, terrible communication, horrible planning of passenger seating until the literal last minute. One of the worst flying experiences of my life. Y'all suck

First of all, we never got on the connecting flight to Denver. They delayed our flight for two hours. If we would have gotten on that flight, we would have been stuck in Denver for 13 hours. So we re- routed our flight for a straight through flight to Oklahoma two days later. THEN, they delayed that flight for two hours. After that we were able to finally get on our flight and come home. Frontier Airlines - one of the worst airlines I have ever been on.

Terrible communication with weather delay, lost baggage, near impossible to reach customer service

My tickets got canceled on me by your site and I didn't have a flight. Then you kept sending me emails on the status of q flight I didn't have tickets for.

Flight was late. Missed connecting in Denver. My new flight is more than 24 hours later and I have no room, vouchers, or compensation, and might also be bumped from the one tomorrow.

This was one of the first frontier airline flights this spring that wasn't delayed. It actually left on time. Some of the flight crew did not look happy, they didn't smile when the passengers were boarding or getting off the plane, and the passengers initiated greetings, not the staff. To me this was an odd experience to have with any flight/airline. I had a bad experience booking this flight. The price didn't solidify until late hours into the night. Ever time I purchased the ticket, I either received a denial email or an error because the price has changed, but it was never reflected on the flyfrontier or kayak websites until way after midnight on the date of travel. This caused me anxiety and irritation with the websites. Then I noticed a mishap with my name on my voucher as I went to check in, it was incorrect. When I proceeded to correct it, Frontier had no easy, let alone free, way to remedy it. I couldn't correct my name without a $75 charge, I couldn't cancel my voucher to repurchase it with the correct name without a $100 charge, because it was too close to departure. Then calling frontier was nearly impossible to remedy the situation with a human. It's already difficult to want to choose frontier because of all the upcharges, but you feel kinda trapped into doing so because it's the more affordable airline.

Everything you need to know for your flight from Knoxville to Denver

Information on your arrival and departure airports

Not what you’re looking for? Find thousands of other hotels, flights, car rentals and package deals with KAYAK.