$144+ 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 8/11. Fares are subject to change and may not be available on all flights or dates of travel.
PDX — TYS
Jul 25 — Aug 11
Round-trip
1 adult, Economy
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Find cheap flights from Portland to Knoxville with Cheapflights
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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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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 June 25, 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 June 25, 2026.
This Frontier deal was found by Cheapflights users on 6/21. 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 Frontier is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 8/612:20 pm
PDX
- TYS
1 stop28h 04m
Frontier
Wed 8/128:19 pm
TYS
- PDX
1 stop23h 32m
Frontier
Deal found 6/21![Frontier logo]()
$274
This Kiwi.com deal was found by Cheapflights users on 6/24. 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 8/195:56 pm
PDX
- TYS
1 stop16h 53m
Multiple Airlines
Sun 8/237:00 am
TYS
- PDX
1 stop13h 11m
Multiple Airlines
Deal found 6/24![Multiple Airlines logo]()
$339
This American Airlines deal was found by Cheapflights users on 6/24. 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 9/127:00 am
PDX
- TYS
1 stop6h 42m
American Airlines
Tue 9/226:00 am
TYS
- PDX
1 stop7h 59m
American Airlines
Deal found 6/24![American Airlines logo]()
$355
This United Airlines deal was found by Cheapflights users on 6/20. 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 9/1510:50 am
PDX
- TYS
2 stops10h 33m
United Airlines
Sat 9/199:00 am
TYS
- PDX
1 stop7h 14m
United Airlines
Deal found 6/20![United Airlines logo]()
$360
This American Airlines deal was found by Cheapflights users on 6/24. 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 10/176:35 am
PDX
- TYS
1 stop9h 45m
American Airlines
Sat 10/245:37 pm
TYS
- PDX
1 stop7h 20m
American Airlines
Deal found 6/24![American Airlines logo]()
$364
This Southwest deal was found by Cheapflights users on 6/24. 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
Sat 8/296:50 am
TYS
- PDX
2 stops10h 10m
Southwest
Deal found 6/24![Southwest logo]()
$366
This United Airlines deal was found by Cheapflights users on 6/24. 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.
Wed 8/511:59 pm
PDX
- TYS
1 stop8h 20m
United Airlines
Sat 8/296:02 pm
TYS
- PDX
1 stop7h 50m
United Airlines
Deal found 6/24![United Airlines logo]()
$376
This United Airlines deal was found by Cheapflights users on 6/22. 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.
Mon 9/1411:02 pm
PDX
- TYS
1 stop7h 55m
United Airlines
Sat 9/199:00 am
TYS
- PDX
1 stop9h 05m
United Airlines
Deal found 6/22![United Airlines logo]()
$384
This American Airlines deal was found by Cheapflights users on 6/24. 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 8/2211:58 am
PDX
- TYS
1 stop8h 20m
American Airlines
Sat 8/291:53 pm
TYS
- PDX
1 stop8h 06m
American Airlines
Deal found 6/24![American Airlines logo]()
$387
This Kiwi.com deal was found by Cheapflights users on 6/24. 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 8/2012:20 pm
PDX
- TYS
2 stops22h 41m
Multiple Airlines
Sun 8/237:00 am
TYS
- PDX
1 stop13h 11m
Multiple Airlines
Deal found 6/24![Multiple Airlines logo]()
$388
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 June 25, 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 June 25, 2026.
This United Airlines deal was found by Cheapflights users on 6/22. 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 9/157:02 am
PDX
- TYS
1 stop6h 56m
United Airlines
Sat 9/196:00 am
TYS
- PDX
1 stop8h 28m
United Airlines
Deal found 6/22![United Airlines logo]()
$355
This Southwest deal was found by Cheapflights users on 6/21. 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 9/711:30 pm
PDX
- TYS
2 stops9h 35m
Southwest
Mon 9/144:50 pm
TYS
- PDX
1 stop7h 25m
Southwest
Deal found 6/21![Southwest logo]()
$440
This Delta deal was found by Cheapflights users on 6/20. 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 8/72:08 pm
PDX
- TYS
1 stop6h 44m
Delta
Fri 8/144:38 pm
TYS
- PDX
1 stop8h 06m
Delta
Deal found 6/20![Delta logo]()
$457
This United Airlines deal was found by Cheapflights users on 6/24. 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.
Wed 8/511:59 pm
PDX
- TYS
1 stop8h 20m
United Airlines
Sat 8/296:02 pm
TYS
- PDX
1 stop7h 50m
United Airlines
Deal found 6/24![United Airlines logo]()
$376
This United Airlines deal was found by Cheapflights users on 6/22. 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.
Mon 9/1411:02 pm
PDX
- TYS
1 stop7h 55m
United Airlines
Sat 9/199:00 am
TYS
- PDX
1 stop9h 05m
United Airlines
Deal found 6/22![United Airlines logo]()
$384
This Delta deal was found by Cheapflights users on 6/21. 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 9/1811:10 pm
PDX
- TYS
1 stop8h 08m
Delta
Fri 9/255:28 pm
TYS
- PDX
1 stop7h 32m
Delta
Deal found 6/21![Delta logo]()
$457
This United Airlines deal was found by Cheapflights users on 6/24. 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.
Fri 9/2511:59 pm
PDX
- TYS
1 stop8h 18m
United Airlines
Mon 9/284:53 pm
TYS
- PDX
1 stop7h 17m
United Airlines
Deal found 6/24![United Airlines logo]()
$435
This United Airlines deal was found by Cheapflights users on 6/21. 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.
Mon 9/711:02 pm
PDX
- TYS
1 stop7h 55m
United Airlines
Mon 9/146:02 pm
TYS
- PDX
1 stop7h 50m
United Airlines
Deal found 6/21![United Airlines logo]()
$435
This United Airlines deal was found by Cheapflights users on 6/23. 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.
Wed 8/2611:02 pm
PDX
- TYS
2 stops12h 35m
United Airlines
Sat 8/297:00 am
TYS
- PDX
2 stops13h 50m
United Airlines
Deal found 6/23![United Airlines logo]()
$475
This United Airlines deal was found by Cheapflights users on 6/23. 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
Sat 8/297:00 am
TYS
- PDX
2 stops11h 05m
United Airlines
Deal found 6/23![United Airlines logo]()
$475
This United Airlines deal was found by Cheapflights users on 6/22. 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 11/77:07 pm
PDX
- TYS
2 stops12h 42m
United Airlines
Fri 11/139:45 am
TYS
- PDX
2 stops14h 23m
United Airlines
Deal found 6/22![United Airlines logo]()
$526
Last-minute flights from Portland to KnoxvilleDiscover last-minute flight deals from Portland to Knoxville. Data last updated June 25, 2026 and is based on user searches.
Discover last-minute flight deals from Portland to Knoxville. Data last updated June 25, 2026 and is based on user searches.
This Delta deal was found by Cheapflights users on 6/22. 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 7/410:30 pm
PDX
- TYS
1 stop9h 39m
Delta
Wed 7/83:54 pm
TYS
- PDX
1 stop8h 50m
Delta
Deal found 6/22![Delta logo]()
$486
This American Airlines deal was found by Cheapflights users on 6/24. 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.
Wed 7/155:07 am
PDX
- TYS
1 stop8h 34m
American Airlines
Sun 7/195:31 pm
TYS
- PDX
1 stop10h 24m
American Airlines
Deal found 6/24![American Airlines logo]()
$459
This Kiwi.com deal was found by Cheapflights users on 6/21. 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 7/168:57 am
PDX
- TYS
2 stops35h 22m
Multiple Airlines
Thu 7/237:00 am
TYS
- PDX
1 stop12h 51m
Multiple Airlines
Deal found 6/21![Multiple Airlines logo]()
$469
This American Airlines deal was found by Cheapflights users on 6/21. 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 7/219:47 pm
PDX
- TYS
1 stop9h 51m
American Airlines
Sun 7/268:11 pm
TYS
- PDX
1 stop7h 44m
American Airlines
Deal found 6/21![American Airlines logo]()
$423
This American Airlines deal was found by Cheapflights users on 6/23. 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.
Thu 7/2311:41 pm
PDX
- TYS
1 stop8h 32m
American Airlines
Thu 7/306:07 pm
TYS
- PDX
1 stop8h 48m
American Airlines
Deal found 6/23![American Airlines logo]()
$477
This Southwest deal was found by Cheapflights users on 6/24. 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.
Fri 7/245:50 am
PDX
- TYS
1 stop10h 20m
Southwest
Sun 7/264:20 pm
TYS
- PDX
2 stops11h 45m
Southwest
Deal found 6/24![Southwest logo]()
$478
This American Airlines deal was found by Cheapflights users on 6/24. 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.
Thu 7/301:34 pm
PDX
- TYS
1 stop7h 17m
American Airlines
Sat 8/16:10 pm
TYS
- PDX
1 stop8h 45m
American Airlines
Deal found 6/24![American Airlines logo]()
$406
This American Airlines deal was found by Cheapflights users on 6/24. 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.
Thu 7/301:34 pm
PDX
- TYS
1 stop7h 17m
American Airlines
Mon 8/31:00 pm
TYS
- PDX
1 stop10h 40m
American Airlines
Deal found 6/24![American Airlines logo]()
$457
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 June 25, 2026.
Search for one-way flight options from Portland to Knoxville. Find affordable one-way fares based on user searches. Data last updated June 25, 2026.
This Booking.com deal was found by Cheapflights users on 6/21. 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.
Tue 8/115:16 pm
PDX
- TYS
1 stop23h 08m
Frontier
Deal found 6/21![Frontier logo]()
$144
This Delta deal was found by Cheapflights users on 6/21. 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 7/310:55 pm
PDX
- TYS
1 stop7h 43m
Delta
Deal found 6/21![Delta logo]()
$198
This Southwest deal was found by Cheapflights users on 6/21. 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.
Fri 7/311:30 pm
PDX
- TYS
2 stops9h 20m
Southwest
Deal found 6/21![Southwest logo]()
$203
This United Airlines deal was found by Cheapflights users on 6/21. 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 8/1111:02 pm
PDX
- TYS
2 stops12h 35m
United Airlines
Deal found 6/21![United Airlines logo]()
$238
This Kiwi.com deal was found by Cheapflights users on 6/21. 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.
Tue 8/115:16 pm
PDX
- TYS
3 stops45h 03m
Multiple Airlines
Deal found 6/21![Multiple Airlines logo]()
$248
This Kiwi.com deal was found by Cheapflights users on 6/20. 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.
Sun 7/192:48 pm
PDX
- TYS
3 stops28h 12m
Multiple Airlines
Deal found 6/20![Multiple Airlines logo]()
$253
This Kiwi.com deal was found by Cheapflights users on 6/20. 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.
Sun 7/192:48 pm
PDX
- TYS
2 stops20h 28m
Allegiant Air
Deal found 6/20![Allegiant Air logo]()
$254
This American Airlines deal was found by Cheapflights users on 6/21. 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.
Thu 7/2311:41 pm
PDX
- TYS
1 stop8h 32m
American Airlines
Deal found 6/21![American Airlines logo]()
$255
This Delta deal was found by Cheapflights users on 6/23. 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 7/2310:55 pm
PDX
- TYS
1 stop7h 41m
Delta
Deal found 6/23![Delta logo]()
$259
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 June 25, 2026.
Most accurate provider | FlightHub 3 stars |
|---|---|
Most trusted provider | FlightHub 3 stars |
Round-trip from | $274 (Frontier) |
One-way from | $144 (Booking.com) |
Popular in | May |
Cheapest in | August |
Average price | $516 |
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 June 25, 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
PortlandKnoxville
PDX - TYS
PDXTYS
Portland
Tue 9/15
7:02 am-4:58 pm
1 stop6h 56m
Knoxville McGhee Tyson
Sat 9/19
6:00 am-11:28 am
1 stop8h 28m
$355
PortlandKnoxville
PDX - TYS
PDXTYS
Portland
Wed 8/5
11:59 pm-11:19 am
1 stop8h 20m
Knoxville McGhee Tyson
Sat 8/29
6:02 pm-10:52 pm
1 stop7h 50m
$376
PortlandKnoxville
PDX - TYS
PDXTYS
Portland
Mon 9/14
11:02 pm-9:57 am
1 stop7h 55m
Knoxville McGhee Tyson
Sat 9/19
9:00 am-3:05 pm
1 stop9h 05m
$384
PortlandKnoxville
PDX - TYS
PDXTYS
Portland
Fri 9/25
11:59 pm-11:17 am
1 stop8h 18m
Knoxville McGhee Tyson
Mon 9/28
4:53 pm-9:10 pm
1 stop7h 17m
$435
PortlandKnoxville
PDX - TYS
PDXTYS
Portland
Mon 9/7
11:02 pm-9:57 am
1 stop7h 55m
Knoxville McGhee Tyson
Mon 9/14
6:02 pm-10:52 pm
1 stop7h 50m
$435
PortlandKnoxville
PDX - TYS
PDXTYS
Portland
Mon 9/7
11:30 pm-12:05 pm
2 stops9h 35m
Knoxville McGhee Tyson
Mon 9/14
4:50 pm-9:15 pm
1 stop7h 25m
$440
Quickest round-trip
PortlandKnoxville
PDX - TYS
PDXTYS
Portland
Fri 8/7
2:08 pm-11:52 pm
1 stop6h 44m
Knoxville McGhee Tyson
Fri 8/14
4:38 pm-9:44 pm
1 stop8h 06m
$457
PortlandKnoxville
PDX - TYS
PDXTYS
Portland
Fri 9/18
11:10 pm-10:18 am
1 stop8h 08m
Knoxville McGhee Tyson
Fri 9/25
5:28 pm-10:00 pm
1 stop7h 32m
$457
PortlandKnoxville
PDX - TYS
PDXTYS
Portland
Wed 8/26
11:02 pm-2:37 pm
2 stops12h 35m
Knoxville McGhee Tyson
Sat 8/29
7:00 am-5:50 pm
2 stops13h 50m
$475
PortlandKnoxville
PDX - TYS
PDXTYS
Portland
Sat 8/22
5:00 am-4:58 pm
2 stops8h 58m
Knoxville McGhee Tyson
Sat 8/29
7:00 am-3:05 pm
2 stops11h 05m
$475
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 June.
| 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 44 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 $393). Flying from Portland to Knoxville in May is currently the most expensive (average of $611). 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 June 25, 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.
Crew
8.5
Overall
7.8
Entertainment
7.8
Food
7.2
Boarding
8.1
Comfort
7.8
Reviews
1 / 20
10.0
ExcellentAnonymous,May 2026
SEA - KOA
Crew
8.5
Overall
7.8
Entertainment
7.8
Food
7.2
Boarding
8.1
Comfort
7.8
Reviews
1 / 20
10.0
ExcellentAnonymous,May 2026
SEA - KOA
Crew
8.5
Overall
7.8
Entertainment
7.8
Food
7.2
Boarding
8.1
Comfort
7.8
Reviews
1 / 20
10.0
ExcellentAnonymous,May 2026
SEA - KOA
Crew
8.5
Overall
7.8
Entertainment
7.8
Food
7.2
Boarding
8.1
Comfort
7.8
Reviews
1 / 20
10.0
ExcellentAnonymous,May 2026
SEA - KOA
Related info for your journey
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| Airline | Cheapest | Average | Flexibility | On-time |
|---|---|---|---|---|
| Cheapest$268 | Average$497 | FlexibilityNo cancel fee | On-timeN/A | |
| Cheapest$304 | Average$466 | FlexibilityNo cancel fee | On-time71% | |
| Cheapest$328 | Average$516 | FlexibilityNo cancel fee | On-time69% |