Cheap Flights from Knoxville TN to Phoenix Sky Harbor AZ from $139

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Flight deals from Knoxville to Phoenix Sky Harbor

Looking for a cheap last-minute deal or the best round-trip flight from Knoxville Airport to Phoenix Sky Harbor Airport? If you want to travel next month, round-trip fares start from $139. Find the lowest prices on one-way and round-trip tickets right here.

Phoenix.$139 per passenger.Departing Sun, Aug 23, returning Thu, Aug 27.Round-trip flight with Allegiant Air.Outbound direct flight with Allegiant Air departing from Knoxville on Sun, Aug 23, arriving in Phoenix Sky Harbor.Inbound direct flight with Allegiant Air departing from Phoenix Sky Harbor on Thu, Aug 27, arriving in Knoxville.Price includes taxes and charges.From $139, select.

Phoenix.$146 per passenger.Departing Thu, Sep 3, returning Sun, Sep 13.Round-trip flight with Allegiant Air.Outbound direct flight with Allegiant Air departing from Knoxville on Thu, Sep 3, arriving in Phoenix Sky Harbor.Inbound direct flight with Allegiant Air departing from Phoenix Sky Harbor on Sun, Sep 13, arriving in Knoxville.Price includes taxes and charges.From $146, select.

Phoenix.$147 per passenger.Departing Sun, Aug 23, returning Sun, Sep 6.Round-trip flight with Allegiant Air.Outbound direct flight with Allegiant Air departing from Knoxville on Sun, Aug 23, arriving in Phoenix Sky Harbor.Inbound direct flight with Allegiant Air departing from Phoenix Sky Harbor on Sun, Sep 6, arriving in Knoxville.Price includes taxes and charges.From $147, select.

Phoenix.$171 per passenger.Departing Fri, Oct 2, returning Mon, Oct 19.Round-trip flight with Allegiant Air.Outbound direct flight with Allegiant Air departing from Knoxville on Fri, Oct 2, arriving in Phoenix Sky Harbor.Inbound direct flight with Allegiant Air departing from Phoenix Sky Harbor on Mon, Oct 19, arriving in Knoxville.Price includes taxes and charges.From $171, select.

Phoenix.$179 per passenger.Departing Fri, Oct 16, returning Thu, Nov 5.Round-trip flight with Allegiant Air.Outbound direct flight with Allegiant Air departing from Knoxville on Fri, Oct 16, arriving in Phoenix Sky Harbor.Inbound direct flight with Allegiant Air departing from Phoenix Sky Harbor on Thu, Nov 5, arriving in Knoxville.Price includes taxes and charges.From $179, select.

Phoenix.$179 per passenger.Departing Sun, Dec 6, returning Thu, Dec 24.Round-trip flight with Allegiant Air.Outbound direct flight with Allegiant Air departing from Knoxville on Sun, Dec 6, arriving in Phoenix Sky Harbor.Inbound direct flight with Allegiant Air departing from Phoenix Sky Harbor on Thu, Dec 24, arriving in Knoxville.Price includes taxes and charges.From $179, select.

Phoenix.$198 per passenger.Departing Thu, Sep 10, returning Thu, Oct 1.Round-trip flight with Allegiant Air.Outbound direct flight with Allegiant Air departing from Knoxville on Thu, Sep 10, arriving in Phoenix Sky Harbor.Inbound direct flight with Allegiant Air departing from Phoenix Sky Harbor on Thu, Oct 1, arriving in Knoxville.Price includes taxes and charges.From $198, select.

Phoenix.$225 per passenger.Departing Thu, Jul 30, returning Thu, Aug 13.Round-trip flight with Allegiant Air.Outbound direct flight with Allegiant Air departing from Knoxville on Thu, Jul 30, arriving in Phoenix Sky Harbor.Inbound direct flight with Allegiant Air departing from Phoenix Sky Harbor on Thu, Aug 13, arriving in Knoxville.Price includes taxes and charges.From $225, select.

Phoenix.$263 per passenger.Departing Sun, Nov 22, returning Thu, Dec 3.Round-trip flight with Allegiant Air.Outbound direct flight with Allegiant Air departing from Knoxville on Sun, Nov 22, arriving in Phoenix Sky Harbor.Inbound direct flight with Allegiant Air departing from Phoenix Sky Harbor on Thu, Dec 3, arriving in Knoxville.Price includes taxes and charges.From $263, select.

Phoenix.$277 per passenger.Departing Thu, Nov 12, returning Sun, Nov 22.Round-trip flight with Allegiant Air.Outbound direct flight with Allegiant Air departing from Knoxville on Thu, Nov 12, arriving in Phoenix Sky Harbor.Inbound direct flight with Allegiant Air departing from Phoenix Sky Harbor on Sun, Nov 22, arriving in Knoxville.Price includes taxes and charges.From $277, select.

Phoenix.$351 per passenger.Departing Thu, Jul 16, returning Thu, Jul 23.Round-trip flight with Allegiant Air.Outbound direct flight with Allegiant Air departing from Knoxville on Thu, Jul 16, arriving in Phoenix Sky Harbor.Inbound direct flight with Allegiant Air departing from Phoenix Sky Harbor on Thu, Jul 23, arriving in Knoxville.Price includes taxes and charges.From $351, select.

Phoenix.$436 per passenger.Departing Wed, Apr 28, returning Thu, May 6.Round-trip flight with Delta.Outbound indirect flight with Delta, departing from Knoxville on Wed, Apr 28, arriving in Phoenix Sky Harbor.Inbound indirect flight with Delta, departing from Phoenix Sky Harbor on Thu, May 6, arriving in Knoxville.Price includes taxes and charges.From $436, select.

Phoenix.$537 per passenger.Departing Sat, Dec 26, returning Sat, Jan 2.Round-trip flight with Southwest Airlines.Outbound indirect flight with Southwest Airlines, departing from Knoxville on Sat, Dec 26, arriving in Phoenix Sky Harbor.Inbound indirect flight with Southwest Airlines, departing from Phoenix Sky Harbor on Sat, Jan 2, arriving in Knoxville.Price includes taxes and charges.From $537, select.

Phoenix.$681 per passenger.Departing Sat, Mar 13, returning Sat, Mar 20.Round-trip flight with Delta.Outbound indirect flight with Delta, departing from Knoxville on Sat, Mar 13, arriving in Phoenix Sky Harbor.Inbound indirect flight with Delta, departing from Phoenix Sky Harbor on Sat, Mar 20, arriving in Knoxville.Price includes taxes and charges.From $681, select.

Find the cheapest month to fly from Knoxville to Phoenix Sky Harbor

We’re always keeping an eye on fares, so you can find the best one in seconds. It looks like Knoxville to Phoenix Sky Harbor flights are currently cheapest in August.

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Direct flights from Knoxville to Phoenix Sky Harbor

Knoxville to Phoenix Sky Harbor: Alternative routes

Compare routes from Knoxville to Phoenix below. You may find an airport to fly into that's cheaper, faster, or easier than Phoenix Sky Harbor.

Knoxville to Phoenix: Flight information

The things to know before you go.

Cheapest flight found	$139
Cheapest month to fly	August
Average flight time	4 hrs, 4 mins
Most popular airline	Allegiant Air
Average flights per week	3

Finding cheap flights from Knoxville to Phoenix Sky Harbor: Frequently asked questions

How much are round-trip flights from Knoxville to Phoenix Sky Harbor?

The best price we found for a round-trip flight from Knoxville to Phoenix Sky Harbor is $139. This is an estimate based on information collected from different airlines and travel providers over the last 4 days and is subject to change and availability.

How long does it take to fly from Knoxville to Phoenix Sky Harbor?

4 hours and 4 minutes is the average flight time from Knoxville to Phoenix Sky Harbor.

Which airlines fly direct from Knoxville to Phoenix Sky Harbor?

Allegiant Air flies direct from Knoxville to Phoenix Sky Harbor.

How many flights are there a week from Knoxville to Phoenix Sky Harbor?

There are 3 flights per week flying from Knoxville to Phoenix Sky Harbor, as of July 2026.

When is the cheapest time to fly from Knoxville to Phoenix Sky Harbor?

The cheapest month to fly from Knoxville to Phoenix Sky Harbor is usually August.

Which upcoming date is cheapest to fly from Knoxville Airport to Phoenix Sky Harbor Airport on?

After crunching the numbers on our flight calendar, we found that it's currently cheapest to fly from Knoxville Airport to Phoenix Sky Harbor Airport on Sunday, August 23, 2026.

Can I get a direct flight from Knoxville Airport to Phoenix Sky Harbor Airport?

Yes – the average flight time is 4 hours and 4 minutes.

How can I find the best flight deal to Phoenix Sky Harbor?

We show every price from over 1,200 airlines and travel agents, comparing them all so you don’t have to. If you know you want to fly to Phoenix Sky Harbor but you’re not ready to book, set up a Price Alert. We’ll track prices for you, and let you know when they rise or fall.

When is the best time to book flights to Phoenix?

We crunched all the numbers in our flight calendar, and it looks like the cheapest time to book a flight to Phoenix is around 40 days in advance, so don’t leave your flight to the last minute.

Which is the cheapest airline to fly with from Knoxville Airport to Phoenix Sky Harbor?

Currently, Allegiant Air offers the cheapest flight tickets to Phoenix Sky Harbor.

Flying from Knoxville Airport (TYS) to Phoenix Sky Harbor Airport (PHX): what you need to know

Around 4 hours is how long you can expect to be in the air on a direct flight from Knoxville Airport to Phoenix Sky Harbor Airport.
The timezone in Phoenix is UTC-7, which is two hours behind Knoxville.
Arriving two hours before an international flight and one hour ahead of a domestic departure are travel rules worth sticking to. Show up at the airport on time to catch your TYS to PHX flight.
Traveling during a peak month like October? Major public holidays and other popular periods can mean longer lines and delays at check-in and security. Play things extra safe and get there up to four hours before an international flight and two hours before domestic departures.
Allegiant Air offers direct flights from Knoxville Airport to Phoenix Sky Harbor Airport. Book with this popular carrier, then get ready to check out the sights in Phoenix — and maybe even more of the United States if time allows.
The majority of travelers choose to travel with Allegiant Air on this route.
Allegiant Air tops the rankings as the most punctual carrier for TYS to PHX flights, with 80.0% of its services arriving on schedule.

How to find the cheapest flights from Knoxville Airport (TYS) to Phoenix Sky Harbor Airport (PHX)

Right now, $66 is the lowest price we've seen for a one-way Knoxville Airport to Phoenix Sky Harbor Airport flight. The best price for a return plane ticket is $139. Bear in mind that fares can change due to availability when booking.
To get your hands on cheap tickets from TYS to PHX, book in advance. Airlines typically offer lower prices when flights are first made available.
May is the cheapest month for flights from Knoxville Airport to Phoenix Sky Harbor Airport. If you want to travel at a different time of year, the 'Whole month' tool will give you the lowest prices across every month.
Save time looking for cheap flights from TYS to PHX by setting up a Price Alert. We'll send you an email or push notification on the app when a new discounted fare appears.
Discover the ideal flight for you with the help of the filters. To see the 'Best,' 'Fastest' or 'Cheapest' flights from Knoxville Airport to Phoenix Sky Harbor Airport, use the 'Sort by' function. You can also filter results by airline, departure and arrival times, and journey duration.

Handy information about Knoxville Airport (TYS)

TYS is located at 2055 Alcoa Highway.
76% of flights that depart Knoxville Airport make it to their destination on schedule.
To get to Knoxville Airport from central Knoxville, it takes about 25 minutes if you're planning to drive. Of course, this depends on traffic. It's approximately 24 kilometers from the airport to the city center.
Taking public transport? Expect a journey time of around 50 minutes.
Looking for a handy hotel close to TYS? If you're boarding an early flight from Knoxville Airport to Phoenix Sky Harbor Airport, these stays will have you moments from your check-in counter:

Arriving at Phoenix Sky Harbor Airport (PHX)

Consider booking a hotel close to PHX if you're catching a late Knoxville Airport to Phoenix Sky Harbor Airport flight. Check in to one of these options and make your arrival easier:
Grab a Phoenix Sky Harbor Airport rental car and explore Phoenix and beyond with your own wheels. Europcar, Dollar and Thrifty are leading providers you can book with here.
Get the best deal by booking your ride from Phoenix Sky Harbor Airport around one week before your trip.

When to fly to Phoenix Sky Harbor Airport (PHX)

It's time to plan your dates for your flight from Knoxville Airport to Phoenix Sky Harbor Airport. April is the busiest month to visit Phoenix. If you want a more relaxed vibe, go in March.
The warmest month in Phoenix is July, with temperatures ranging between 27ºC (81ºF) and 45ºC (113ºF). Lock in your flights from Knoxville Airport to Phoenix Sky Harbor Airport in this month if this is the kind of weather you like.
Search for cheap tickets from TYS to PHX in January if you like traveling in cooler conditions. Temperatures are at their lowest around then, ranging between 4ºC (39ºF) and 21ºC (70ºF) on average.

Explore more of the United States

San Diego is just one of the many cities in the United States waiting to be explored once you've taken in the sights of Phoenix. Around 483 kilometers away to the west, check out popular attractions including San Diego Zoo, San Diego Balboa Park and USS Midway Museum.
If you're eager to discover another corner of the United States, head for Las Vegas, about 418 kilometers north-west of Phoenix. Ciudad del Pecado o Las Vegas, Las Vegas Strip and Fountains of Bellagio are among its highlights.