$188+ Cheap flights from Portland to Knoxville (PDX - TYS)
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 9/15. Fares are subject to change and may not be available on all flights or dates of travel.
PDX — TYS
Jun 30 — Jul 71
Round-trip
1 adult, Economy
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Find cheap flights from Portland to Knoxville with Cheapflights
1. Tell us where you want to go
Enter your travel information like dates, passengers, trip type (one-way or round trip), and preferred cabin class then click “Find deals”2. Select your favorite providers
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Review each provider’s pricing and select the best option for you! Book through your favorite provider’s website for a seamless experience.Cheap flight deals from Portland to Knoxville
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Best
Last-minute
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Cheapest flights from Portland to KnoxvilleExplore the most affordable flight options available from Portland to Knoxville. Find the lowest fares from popular airlines and budget airlines, with prices last updated on May 31, 2026.
Explore the most affordable flight options available from Portland to Knoxville. Find the lowest fares from popular airlines and budget airlines, with prices last updated on May 31, 2026.
This Delta deal was found by Cheapflights users on 5/29. 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.
Tue 9/1510:55 pm
PDX
- TYS
1 stop7h 44m
Delta
Tue 9/224:30 pm
TYS
- PDX
1 stop8h 15m
Delta
Deal found 5/29![Delta logo]()
$257
This American Airlines deal was found by Cheapflights users on 5/30. 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.
Sat 9/126:00 am
PDX
- TYS
1 stop7h 42m
American Airlines
Tue 9/222:43 pm
TYS
- PDX
1 stop7h 37m
American Airlines
Deal found 5/30![American Airlines logo]()
$301
This United Airlines deal was found by Cheapflights users on 5/29. 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.
Tue 8/411:40 pm
PDX
- TYS
1 stop7h 03m
United Airlines
Wed 8/126:02 pm
TYS
- PDX
1 stop7h 50m
United Airlines
Deal found 5/29![United Airlines logo]()
$326
This American Airlines deal was found by Cheapflights users on 5/29. 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.
Tue 9/159:00 am
PDX
- TYS
2 stops8h 52m
American Airlines
Tue 9/225:35 pm
TYS
- PDX
1 stop8h 48m
American Airlines
Deal found 5/29![American Airlines logo]()
$334
This American Airlines deal was found by Cheapflights users on 5/30. 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.
Sat 8/2211:59 pm
PDX
- TYS
1 stop8h 19m
American Airlines
Sat 8/296:03 am
TYS
- PDX
1 stop7h 51m
American Airlines
Deal found 5/30![American Airlines logo]()
$348
This Delta deal was found by Cheapflights users on 5/29. 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 9/3011:43 am
PDX
- TYS
1 stop9h 07m
Delta
Thu 10/14:30 pm
TYS
- PDX
1 stop8h 15m
Delta
Deal found 5/29![Delta logo]()
$350
This Delta deal was found by Cheapflights users on 5/29. 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 8/511:55 am
PDX
- TYS
1 stop8h 05m
Delta
Mon 8/175:45 am
TYS
- PDX
1 stop7h 42m
Delta
Deal found 5/29![Delta logo]()
$370
This United Airlines deal was found by Cheapflights users on 5/28. 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.
Tue 6/2311:30 pm
PDX
- TYS
1 stop8h 12m
United Airlines
Tue 7/146:00 am
TYS
- PDX
1 stop8h 38m
United Airlines
Deal found 5/28![United Airlines logo]()
$375
This Kiwi.com deal was found by Cheapflights users on 5/27. 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 Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 7/225:21 pm
PDX
- TYS
1 stop17h 30m
Multiple Airlines
Mon 8/36:30 am
TYS
- PDX
2 stops37h 01m
Multiple Airlines
Deal found 5/27![Multiple Airlines logo]()
$385
This American Airlines deal was found by Cheapflights users on 5/25. 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.
Tue 7/215:49 am
PDX
- TYS
1 stop8h 48m
American Airlines
Wed 7/295:31 pm
TYS
- PDX
1 stop10h 24m
American Airlines
Deal found 5/25![American Airlines logo]()
$393
This American Airlines deal was found by Cheapflights users on 5/27. 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.
Tue 10/1311:58 pm
PDX
- TYS
1 stop9h 30m
American Airlines
Tue 10/206:00 am
TYS
- PDX
1 stop7h 57m
American Airlines
Deal found 5/27![American Airlines logo]()
$395
Best flights from Portland to KnoxvilleDiscover carefully curated flight deals from Portland to Knoxville that have cost, travel time, and layovers in mind to ensure you get the best travel experience. Data last updated May 31, 2026.
Discover carefully curated flight deals from Portland to Knoxville that have cost, travel time, and layovers in mind to ensure you get the best travel experience. Data last updated May 31, 2026.
This United Airlines deal was found by Cheapflights users on 5/29. 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.
Tue 8/411:40 pm
PDX
- TYS
1 stop7h 03m
United Airlines
Wed 8/126:02 pm
TYS
- PDX
1 stop7h 50m
United Airlines
Deal found 5/29![United Airlines logo]()
$326
This American Airlines deal was found by Cheapflights users on 5/25. 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.
Mon 6/2912:40 am
PDX
- TYS
1 stop9h 22m
American Airlines
Sat 7/45:37 am
TYS
- PDX
2 stops10h 12m
American Airlines
Deal found 5/25![American Airlines logo]()
$421
This Delta deal was found by Cheapflights users on 5/25. 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.
Sun 9/2010:55 pm
PDX
- TYS
1 stop9h 10m
Delta
Fri 9/256:35 am
TYS
- PDX
1 stop7h 04m
Delta
Deal found 5/25![Delta logo]()
$457
This Southwest deal was found by Cheapflights users on 5/27. 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 Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 10/1311:35 pm
PDX
- TYS
2 stops9h 30m
Southwest
Tue 10/201:50 pm
TYS
- PDX
2 stops10h 25m
Southwest
Deal found 5/27![Southwest logo]()
$466
This United Airlines deal was found by Cheapflights users on 5/26. 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.
Tue 8/257:16 am
PDX
- TYS
2 stops10h 08m
United Airlines
Fri 8/287:00 am
TYS
- PDX
1 stop7h 28m
United Airlines
Deal found 5/26![United Airlines logo]()
$421
This Delta deal was found by Cheapflights users on 5/25. 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.
Tue 10/611:55 am
PDX
- TYS
1 stop6h 39m
Delta
Sun 10/115:30 am
TYS
- PDX
1 stop8h 26m
Delta
Deal found 5/25![Delta logo]()
$478
This Southwest deal was found by Cheapflights users on 5/29. 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 Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 8/55:50 am
PDX
- TYS
2 stops10h 05m
Southwest
Mon 8/174:50 pm
TYS
- PDX
1 stop8h 55m
Southwest
Deal found 5/29![Southwest logo]()
$482
This United Airlines deal was found by Cheapflights users on 5/25. 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.
Sat 8/225:00 am
PDX
- TYS
2 stops8h 58m
United Airlines
Sun 8/307:00 am
TYS
- PDX
1 stop7h 28m
United Airlines
Deal found 5/25![United Airlines logo]()
$440
This Southwest deal was found by Cheapflights users on 5/26. 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 Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 9/1411:30 pm
PDX
- TYS
2 stops9h 35m
Southwest
Mon 9/212:05 pm
TYS
- PDX
2 stops11h 40m
Southwest
Deal found 5/26![Southwest logo]()
$485
This United Airlines deal was found by Cheapflights users on 5/29. 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.
Sat 8/158:17 am
PDX
- TYS
1 stop9h 36m
United Airlines
Wed 8/194:50 pm
TYS
- PDX
1 stop9h 04m
United Airlines
Deal found 5/29![United Airlines logo]()
$446
This United Airlines deal was found by Cheapflights users on 5/25. 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.
Tue 6/911:30 pm
PDX
- TYS
1 stop8h 12m
United Airlines
Tue 6/166:00 am
TYS
- PDX
1 stop8h 38m
United Airlines
Deal found 5/25![United Airlines logo]()
$476
Last-minute flights from Portland to KnoxvilleDiscover last-minute flight deals from Portland to Knoxville. Data last updated May 31, 2026 and is based on user searches.
Discover last-minute flight deals from Portland to Knoxville. Data last updated May 31, 2026 and is based on user searches.
This Booking.com deal was found by Cheapflights users on 5/27. 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 Booking.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 6/712:35 pm
PDX
- TYS
1 stop27h 58m
Frontier
Fri 6/128:32 pm
TYS
- PDX
1 stop23h 25m
Frontier
Deal found 5/27![Frontier logo]()
$499
This United Airlines deal was found by Cheapflights users on 5/25. 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.
Tue 6/911:30 pm
PDX
- TYS
1 stop8h 12m
United Airlines
Tue 6/166:00 am
TYS
- PDX
1 stop8h 38m
United Airlines
Deal found 5/25![United Airlines logo]()
$476
This American Airlines deal was found by Cheapflights users on 5/25. 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.
Tue 6/99:47 pm
PDX
- TYS
1 stop9h 49m
American Airlines
Tue 6/235:33 pm
TYS
- PDX
1 stop10h 17m
American Airlines
Deal found 5/25![American Airlines logo]()
$486
This Delta deal was found by Cheapflights users on 5/28. 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.
Sat 6/2010:30 pm
PDX
- TYS
1 stop8h 08m
Delta
Mon 6/225:25 pm
TYS
- PDX
1 stop7h 25m
Delta
Deal found 5/28![Delta logo]()
$517
This United Airlines deal was found by Cheapflights users on 5/28. 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.
Tue 6/2311:30 pm
PDX
- TYS
1 stop8h 12m
United Airlines
Tue 7/146:00 am
TYS
- PDX
1 stop8h 38m
United Airlines
Deal found 5/28![United Airlines logo]()
$375
This American Airlines deal was found by Cheapflights users on 5/26. 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.
Tue 6/231:45 pm
PDX
- TYS
1 stop7h 08m
American Airlines
Tue 6/306:43 pm
TYS
- PDX
1 stop8h 04m
American Airlines
Deal found 5/26![American Airlines logo]()
$498
This Delta deal was found by Cheapflights users on 5/29. 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.
Fri 6/262:10 pm
PDX
- TYS
1 stop6h 44m
Delta
Fri 7/36:42 pm
TYS
- PDX
1 stop7h 36m
Delta
Deal found 5/29![Delta logo]()
$487
This American Airlines deal was found by Cheapflights users on 5/28. 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.
Mon 6/2912:40 am
PDX
- TYS
1 stop9h 22m
American Airlines
Sat 7/41:43 pm
TYS
- PDX
1 stop10h 17m
American Airlines
Deal found 5/28![American Airlines logo]()
$416
One-way flights from Portland to KnoxvilleSearch for one-way flight options from Portland to Knoxville. Find affordable one-way fares based on user searches. Data last updated May 31, 2026.
Search for one-way flight options from Portland to Knoxville. Find affordable one-way fares based on user searches. Data last updated May 31, 2026.
This American Airlines deal was found by Cheapflights users on 5/28. 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.
Tue 9/1511:06 pm
PDX
- TYS
1 stop7h 38m
American Airlines
Deal found 5/28![American Airlines logo]()
$188
This Southwest deal was found by Cheapflights users on 5/28. 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 Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 9/1511:30 pm
PDX
- TYS
2 stops9h 35m
Southwest
Deal found 5/28![Southwest logo]()
$193
This Kiwi.com deal was found by Cheapflights users on 5/26. 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 Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 9/109:34 pm
PDX
- TYS
1 stop17h 39m
Multiple Airlines
Deal found 5/26![Multiple Airlines logo]()
$197
This Kiwi.com deal was found by Cheapflights users on 5/27. 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 Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 6/245:20 pm
PDX
- TYS
2 stops39h 39m
Multiple Airlines
Deal found 5/27![Multiple Airlines logo]()
$206
This United Airlines deal was found by Cheapflights users on 5/27. 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.
Thu 8/2010:35 am
PDX
- TYS
1 stop7h 18m
United Airlines
Deal found 5/27![United Airlines logo]()
$207
This Kiwi.com deal was found by Cheapflights users on 5/27. 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 Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 7/2312:20 pm
PDX
- TYS
2 stops20h 43m
Multiple Airlines
Deal found 5/27![Multiple Airlines logo]()
$210
This Gotogate deal was found by Cheapflights users on 5/27. 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 Gotogate is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 7/2312:20 pm
PDX
- TYS
1 stop28h 04m
Frontier
Deal found 5/27![Frontier logo]()
$221
This Delta deal was found by Cheapflights users on 5/27. 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.
Thu 7/232:08 pm
PDX
- TYS
1 stop6h 44m
Delta
Deal found 5/27![Delta logo]()
$229
Find flight deals from Portland to Knoxville
Discover tips and strategies to find the most affordable flight options for your journey from Portland (PDX) to Knoxville (TYS). 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 May 31, 2026.
Most accurate provider | FlightHub 3 stars |
|---|---|
Most trusted provider | FlightHub 3 stars |
Round-trip from | $257 (Delta) |
One-way from | $188 (American Airlines) |
Popular in | March |
Cheapest in | August |
Average price | $512 |
Cheapflights Fare Finder
Customize your flight search to find flights from Portland to Knoxville 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 May 31, 2026.
Use the filters below to find and compare flights from Portland to Knoxville that are best for you.
Fly from
Fly to
Route
Depart
Return
Cheapest round-trip
Quickest round-trip
PortlandKnoxville
PDX - TYS
PDXTYS
Portland
Tue 8/4
11:40 pm-9:43 am
1 stop7h 03m
Knoxville McGhee Tyson
Wed 8/12
6:02 pm-10:52 pm
1 stop7h 50m
$326
PortlandKnoxville
PDX - TYS
PDXTYS
Portland
Mon 6/29
12:40 am-1:02 pm
1 stop9h 22m
Knoxville McGhee Tyson
Sat 7/4
5:37 am-12:49 pm
2 stops10h 12m
$421
PortlandKnoxville
PDX - TYS
PDXTYS
Portland
Tue 8/25
7:16 am-8:24 pm
2 stops10h 08m
Knoxville McGhee Tyson
Fri 8/28
7:00 am-11:28 am
1 stop7h 28m
$421
PortlandKnoxville
PDX - TYS
PDXTYS
Portland
Sat 8/22
5:00 am-4:58 pm
2 stops8h 58m
Knoxville McGhee Tyson
Sun 8/30
7:00 am-11:28 am
1 stop7h 28m
$440
PortlandKnoxville
PDX - TYS
PDXTYS
Portland
Sat 8/15
8:17 am-8:53 pm
1 stop9h 36m
Knoxville McGhee Tyson
Wed 8/19
4:50 pm-10:54 pm
1 stop9h 04m
$446
PortlandKnoxville
PDX - TYS
PDXTYS
Portland
Sun 9/20
10:55 pm-11:05 am
1 stop9h 10m
Knoxville McGhee Tyson
Fri 9/25
6:35 am-10:39 am
1 stop7h 04m
$457
PortlandKnoxville
PDX - TYS
PDXTYS
Portland
Tue 10/13
11:35 pm-12:05 pm
2 stops9h 30m
Knoxville McGhee Tyson
Tue 10/20
1:50 pm-9:15 pm
2 stops10h 25m
$466
PortlandKnoxville
PDX - TYS
PDXTYS
Portland
Tue 6/9
11:30 pm-10:42 am
1 stop8h 12m
Knoxville McGhee Tyson
Tue 6/16
6:00 am-11:38 am
1 stop8h 38m
$476
PortlandKnoxville
PDX - TYS
PDXTYS
Portland
Tue 10/6
11:55 am-9:34 pm
1 stop6h 39m
Knoxville McGhee Tyson
Sun 10/11
5:30 am-10:56 am
1 stop8h 26m
$478
PortlandKnoxville
PDX - TYS
PDXTYS
Portland
Wed 8/5
5:50 am-6:55 pm
2 stops10h 05m
Knoxville McGhee Tyson
Mon 8/17
4:50 pm-10:45 pm
1 stop8h 55m
$482
Showing 1-10 of 16 resultsSorted by cheapest first
Compare providers for flights from Portland to Knoxville
Provider information is updated monthly. Please note that these providers often have deals for this flight, but the availability may vary on a day-by-day basis on Cheapflights.
Use the table below to compare price accuracy, trust ratings, and cancellation policies for each provider offering flight deals from Portland to Knoxville in May.
| Provider | Price Accuracy | Trust Score* |
|---|---|---|
| Price Accuracy1 star | Trust Score*3 stars | |
| Price Accuracy3 stars | Trust Score*3 stars |
- Most accurate provider: When it comes to deals on Portland-Knoxville flights, users find the pricing of FlightHub to be most consistent on Cheapflights vs. FlightHub Users can find the same prices on Portland-Knoxville flight deals on Cheapflights vs. FlightHub >95% of the time. Price accuracy is based on data collected from Portland-Knoxville flight searches over the past month and is updated monthly.
- Most trusted provider: When it comes to deals on Portland-Knoxville flights, Cheapflights users trust FlightHub the most. FlightHub has received a user feedback score of 3 out of 3 stars (3 being the best), meaning they have been trusted the most by Cheapflights users looking for Portland-Knoxville flight deals. Provider user feedback score is based on Cheapflights searches over the past month and is updated monthly.
Best time to book a flight from Portland to Knoxville
Have a flexible travel schedule? Discover the best time to fly to Knoxville from Portland with our price prediction graph.
PDX-TYS
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 Portland to Knoxville
How far ahead should I book a flight from Portland to Knoxville?
The best time to book flights from Portland to Knoxville is 74 days before your desired departure date. The cost of your flight will likely increase significantly if you book two weeks in advance of your flight.
What is the cheapest month to book a flight from Portland to Knoxville?
Currently, August is the cheapest month in which you can book a flight from Portland to Knoxville (average of $388). Flying from Portland to Knoxville in March is currently the most expensive (average of $569). 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.
How much does it cost to fly round-trip from Portland to Knoxville?
Reviews of airlines servicing Knoxville
Get insights into the airlines that provide service to Knoxville. 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 Knoxville. Reviews last updated May 31, 2026.
Read through reviews of airlines operating flights from Portland to Knoxville, such as Delta,United Airlines, andAmerican Airlines. Reviews also offer insight into each airline's entertainment options, comfort, food, crew/service, and boarding process.
Boarding
8.1
Entertainment
7.8
Crew
8.5
Overall
7.9
Food
7.2
Comfort
7.8
Reviews
1 / 20
10.0
ExcellentAnonymous,May 2026
SEA - KOA
Boarding
8.1
Entertainment
7.8
Crew
8.5
Overall
7.9
Food
7.2
Comfort
7.8
Reviews
1 / 20
10.0
ExcellentAnonymous,May 2026
SEA - KOA
Boarding
8.1
Entertainment
7.8
Crew
8.5
Overall
7.9
Food
7.2
Comfort
7.8
Reviews
1 / 20
10.0
ExcellentAnonymous,May 2026
SEA - KOA
Boarding
8.1
Entertainment
7.8
Crew
8.5
Overall
7.9
Food
7.2
Comfort
7.8
Reviews
1 / 20
10.0
ExcellentAnonymous,May 2026
SEA - KOA
Boarding
8.1
Entertainment
7.8
Crew
8.5
Overall
7.9
Food
7.2
Comfort
7.8
Reviews
1 / 20
10.0
ExcellentAnonymous,May 2026
SEA - KOA
Related info for your journey
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Top 4 airlines flying from Portland to Knoxville
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| Airline | Cheapest | Average | Flexibility | On-time |
|---|---|---|---|---|
| Cheapest$139 | Average$326 | FlexibilityNo cancel fee | On-time62% | |
| Cheapest$268 | Average$478 | FlexibilityNo cancel fee | On-timeN/A | |
| Cheapest$308 | Average$461 | FlexibilityNo cancel fee | On-time71% | |
| Cheapest$328 | Average$498 | FlexibilityNo cancel fee | On-time69% |