$252+ Cheap flights from Knoxville to Portsmouth, NH (TYS - PSM)
This is the cheapest round-trip flight price found by a Cheapflights user in the last 72 hours by searching for a flight departing on 12/31. Fares are subject to change and may not be available on all flights or dates of travel.
TYS — PSM
Dec 10 — Dec 171
Round-trip
1 adult, Economy
We work with more than 300 partners to bring you better travel deals
Find cheap flights from Knoxville to Portsmouth 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
We find the providers serving your travel needs. Choose up to four travel providers to compare side-by-side for flights, hotels, or car rentals.3. Compare prices and book
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 Knoxville to Portsmouth
Cheapest
Best
Last-minute
One-way
Cheapest flights from Knoxville to PortsmouthExplore the most affordable flight options available from Knoxville to Portsmouth. Find the lowest fares from popular airlines and budget airlines, with prices last updated on November 10, 2026.
Explore the most affordable flight options available from Knoxville to Portsmouth. Find the lowest fares from popular airlines and budget airlines, with prices last updated on November 10, 2026.
This WAYA deal was found by Cheapflights users on 11/5. 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 WAYA is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 12/68:00 am -
1 stop10h 24m
Sun 12/1310:21 am -
1 stop9h 14m
Deal found 11/5![Allegiant Air logo]()
$427
This WAYA deal was found by Cheapflights users on 11/8. 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 WAYA is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 12/177:30 am -
1 stop10h 39m
Sun 12/2011:39 am -
1 stop10h 18m
Deal found 11/8![Allegiant Air logo]()
$508
This WAYA deal was found by Cheapflights users on 11/8. 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 WAYA is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 12/207:30 am -
1 stop10h 09m
Tue 12/2211:09 am -
1 stop6h 30m
Deal found 11/8![Allegiant Air logo]()
$518
This WAYA deal was found by Cheapflights users on 11/5. 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 WAYA is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 12/38:00 am -
1 stop10h 24m
Thu 12/1010:21 am -
1 stop9h 14m
Deal found 11/5![Allegiant Air logo]()
$522
This WAYA deal was found by Cheapflights users on 11/8. 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 WAYA is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 12/189:25 am -
1 stop7h 29m
Sun 12/2011:39 am -
1 stop10h 18m
Deal found 11/8![Allegiant Air logo]()
$528
This WAYA deal was found by Cheapflights users on 11/7. 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 WAYA is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 12/38:00 am -
1 stop10h 24m
Sun 12/610:21 am -
1 stop9h 14m
Deal found 11/7![Allegiant Air logo]()
$566
This WAYA deal was found by Cheapflights users on 11/6. 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 WAYA is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 11/246:30 am -
1 stop11h 37m
Sat 11/2810:37 am -
1 stop10h 30m
Deal found 11/6![Allegiant Air logo]()
$595
This WAYA deal was found by Cheapflights users on 11/7. 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 WAYA is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 11/226:10 am -
1 stop12h 29m
Tue 11/2411:49 am -
1 stop9h 02m
Deal found 11/7![Allegiant Air logo]()
$632
This WAYA deal was found by Cheapflights users on 11/8. 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 WAYA is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 12/226:00 am -
1 stop10h 59m
Sun 12/276:29 pm -
1 stop14h 30m
Deal found 11/8![Allegiant Air logo]()
$683
Best flights from Knoxville to PortsmouthDiscover carefully curated flight deals from Knoxville to Portsmouth that have cost, travel time, and layovers in mind to ensure you get the best travel experience. Data last updated November 10, 2026.
Discover carefully curated flight deals from Knoxville to Portsmouth that have cost, travel time, and layovers in mind to ensure you get the best travel experience. Data last updated November 10, 2026.
This WAYA deal was found by Cheapflights users on 11/5. 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 WAYA is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 12/68:00 am -
1 stop10h 24m
Sun 12/1310:21 am -
1 stop9h 14m
Deal found 11/5![Allegiant Air logo]()
$427
This Kiwi.com deal was found by Cheapflights users on 11/9. 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 11/246:30 am -
1 stop11h 37m
Sat 11/288:37 pm -
2 stops20h 12m
Deal found 11/9![Multiple Airlines logo]()
$785
This WAYA deal was found by Cheapflights users on 11/8. 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 WAYA is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 12/177:30 am -
1 stop10h 39m
Sun 12/2011:39 am -
1 stop10h 18m
Deal found 11/8![Allegiant Air logo]()
$508
This WAYA deal was found by Cheapflights users on 11/8. 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 WAYA is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 12/207:30 am -
1 stop10h 09m
Tue 12/2211:09 am -
1 stop6h 30m
Deal found 11/8![Allegiant Air logo]()
$518
This WAYA deal was found by Cheapflights users on 11/5. 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 WAYA is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 12/38:00 am -
1 stop10h 24m
Thu 12/1010:21 am -
1 stop9h 14m
Deal found 11/5![Allegiant Air logo]()
$522
This WAYA deal was found by Cheapflights users on 11/8. 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 WAYA is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 12/189:25 am -
1 stop7h 29m
Sun 12/2011:39 am -
1 stop10h 18m
Deal found 11/8![Allegiant Air logo]()
$528
This WAYA deal was found by Cheapflights users on 11/7. 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 WAYA is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 12/38:00 am -
1 stop10h 24m
Sun 12/610:21 am -
1 stop9h 14m
Deal found 11/7![Allegiant Air logo]()
$566
This WAYA deal was found by Cheapflights users on 11/6. 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 WAYA is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 11/246:30 am -
1 stop11h 37m
Sat 11/2810:37 am -
1 stop10h 30m
Deal found 11/6![Allegiant Air logo]()
$595
This WAYA deal was found by Cheapflights users on 11/7. 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 WAYA is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 11/226:10 am -
1 stop12h 29m
Tue 11/2411:49 am -
1 stop9h 02m
Deal found 11/7![Allegiant Air logo]()
$632
This WAYA deal was found by Cheapflights users on 11/8. 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 WAYA is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 11/246:30 am -
1 stop11h 37m
Fri 11/2711:59 am -
1 stop7h 23m
Deal found 11/8![Allegiant Air logo]()
$762
This WAYA deal was found by Cheapflights users on 11/8. 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 WAYA is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 12/177:30 am -
1 stop10h 39m
Thu 12/2411:39 am -
1 stop10h 18m
Deal found 11/8![Allegiant Air logo]()
$779
Last-minute flights from Knoxville to PortsmouthDiscover last-minute flight deals from Knoxville to Portsmouth. Data last updated November 10, 2026 and is based on user searches.
Discover last-minute flight deals from Knoxville to Portsmouth. Data last updated November 10, 2026 and is based on user searches.
This WAYA deal was found by Cheapflights users on 11/7. 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 WAYA is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 11/226:10 am -
1 stop12h 29m
Tue 11/2411:49 am -
1 stop9h 02m
Deal found 11/7![Allegiant Air logo]()
$632
This WAYA deal was found by Cheapflights users on 11/6. 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 WAYA is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 11/246:30 am -
1 stop11h 37m
Sat 11/2810:37 am -
1 stop10h 30m
Deal found 11/6![Allegiant Air logo]()
$595
This WAYA deal was found by Cheapflights users on 11/5. 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 WAYA is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 12/38:00 am -
1 stop10h 24m
Thu 12/1010:21 am -
1 stop9h 14m
Deal found 11/5![Allegiant Air logo]()
$522
This WAYA deal was found by Cheapflights users on 11/7. 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 WAYA is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 12/38:00 am -
1 stop10h 24m
Sun 12/610:21 am -
1 stop9h 14m
Deal found 11/7![Allegiant Air logo]()
$566
This WAYA deal was found by Cheapflights users on 11/5. 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 WAYA is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 12/68:00 am -
1 stop10h 24m
Sun 12/1310:21 am -
1 stop9h 14m
Deal found 11/5![Allegiant Air logo]()
$427
This WAYA deal was found by Cheapflights users on 11/8. 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 WAYA is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 12/177:30 am -
1 stop10h 39m
Sun 12/2011:39 am -
1 stop10h 18m
Deal found 11/8![Allegiant Air logo]()
$508
This WAYA deal was found by Cheapflights users on 11/8. 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 WAYA is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 12/189:25 am -
1 stop7h 29m
Sun 12/2011:39 am -
1 stop10h 18m
Deal found 11/8![Allegiant Air logo]()
$528
This WAYA deal was found by Cheapflights users on 11/8. 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 WAYA is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 12/207:30 am -
1 stop10h 09m
Tue 12/2211:09 am -
1 stop6h 30m
Deal found 11/8![Allegiant Air logo]()
$518
This WAYA deal was found by Cheapflights users on 11/8. 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 WAYA is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 12/226:00 am -
1 stop10h 59m
Sun 12/276:29 pm -
1 stop14h 30m
Deal found 11/8![Allegiant Air logo]()
$683
One-way flights from Knoxville to PortsmouthSearch for one-way flight options from Knoxville to Portsmouth. Find affordable one-way fares based on user searches. Data last updated November 10, 2026.
Search for one-way flight options from Knoxville to Portsmouth. Find affordable one-way fares based on user searches. Data last updated November 10, 2026.
This WAYA deal was found by Cheapflights users on 11/9. 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 WAYA is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 12/317:30 am -
1 stop10h 09m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 11/9![Allegiant Air logo]()
$252
This WAYA deal was found by Cheapflights users on 11/5. 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 WAYA is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 12/177:30 am -
1 stop10h 39m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 11/5![Allegiant Air logo]()
$258
This WAYA deal was found by Cheapflights users on 11/7. 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 WAYA is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 11/1912:58 pm -
1 stop5h 41m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 11/7![Allegiant Air logo]()
$264
This WAYA deal was found by Cheapflights users on 11/7. 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 WAYA is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 12/138:00 am -
1 stop10h 24m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 11/7![Allegiant Air logo]()
$320
This WAYA deal was found by Cheapflights users on 11/9. 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 WAYA is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 11/226:10 am -
1 stop12h 29m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 11/9![Allegiant Air logo]()
$347
This WAYA deal was found by Cheapflights users on 11/6. 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 WAYA is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 4/47:10 am -
1 stop11h 46m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 11/6![Allegiant Air logo]()
$355
Find flight deals from Knoxville to Portsmouth
Discover tips and strategies to find the most affordable flight options for your journey from Knoxville (TYS) to Portsmouth (PSM). 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 November 10, 2026.
Most accurate provider | FlightHub 3 stars |
|---|---|
Most trusted provider | FlightHub 3 stars |
Round-trip from | $427 (WAYA) |
One-way from | $252 (WAYA) |
Popular in | June |
Cheapest in | February |
Average price | $297 |
Cheapflights Fare Finder
Customize your flight search to find flights from Knoxville to Portsmouth 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 7,457,451 searches. Data last updated November 10, 2026.
Use the filters below to find and compare flights from Knoxville to Portsmouth that are best for you.
Fly from
Fly to
Route
Depart
Return
Cheapest round-trip
KnoxvillePortsmouth
TYS Knoxville McGhee Tyson - PSM Portsmouth Pease Intl
TYSPSM
Knoxville McGhee Tyson
Thu 12/31
7:30 am-5:39 pm
1 stop10h 09m
Portsmouth Pease Intl
Wed 12/31
12:00 am-12:00 am
Nonstop0h 00m
$252
KnoxvillePortsmouth
TYS Knoxville McGhee Tyson - PSM Portsmouth Pease Intl
TYSPSM
Knoxville McGhee Tyson
Thu 12/17
7:30 am-6:09 pm
1 stop10h 39m
Portsmouth Pease Intl
Wed 12/31
12:00 am-12:00 am
Nonstop0h 00m
$258
Quickest round-trip
KnoxvillePortsmouth
TYS Knoxville McGhee Tyson - PSM Portsmouth Pease Intl
TYSPSM
Knoxville McGhee Tyson
Thu 11/19
12:58 pm-6:39 pm
1 stop5h 41m
Portsmouth Pease Intl
Wed 12/31
12:00 am-12:00 am
Nonstop0h 00m
$264
KnoxvillePortsmouth
TYS Knoxville McGhee Tyson - PSM Portsmouth Pease Intl
TYSPSM
Knoxville McGhee Tyson
Sun 12/13
8:00 am-6:24 pm
1 stop10h 24m
Portsmouth Pease Intl
Wed 12/31
12:00 am-12:00 am
Nonstop0h 00m
$320
KnoxvillePortsmouth
TYS Knoxville McGhee Tyson - PSM Portsmouth Pease Intl
TYSPSM
Knoxville McGhee Tyson
Sun 11/22
6:10 am-6:39 pm
1 stop12h 29m
Portsmouth Pease Intl
Wed 12/31
12:00 am-12:00 am
Nonstop0h 00m
$347
KnoxvillePortsmouth
TYS Knoxville McGhee Tyson - PSM Portsmouth Pease Intl
TYSPSM
Knoxville McGhee Tyson
Sun 4/4
7:10 am-6:56 pm
1 stop11h 46m
Portsmouth Pease Intl
Wed 12/31
12:00 am-12:00 am
Nonstop0h 00m
$355
KnoxvillePortsmouth
TYS Knoxville McGhee Tyson - PSM Portsmouth Pease Intl
TYSPSM
Knoxville McGhee Tyson
Sun 12/6
8:00 am-6:24 pm
1 stop10h 24m
Portsmouth Pease Intl
Sun 12/13
10:21 am-7:35 pm
1 stop9h 14m
$427
KnoxvillePortsmouth
TYS Knoxville McGhee Tyson - PSM Portsmouth Pease Intl
TYSPSM
Knoxville McGhee Tyson
Thu 12/17
7:30 am-6:09 pm
1 stop10h 39m
Portsmouth Pease Intl
Sun 12/20
11:39 am-9:57 pm
1 stop10h 18m
$508
KnoxvillePortsmouth
TYS Knoxville McGhee Tyson - PSM Portsmouth Pease Intl
TYSPSM
Knoxville McGhee Tyson
Sun 12/20
7:30 am-5:39 pm
1 stop10h 09m
Portsmouth Pease Intl
Tue 12/22
11:09 am-5:39 pm
1 stop6h 30m
$518
KnoxvillePortsmouth
TYS Knoxville McGhee Tyson - PSM Portsmouth Pease Intl
TYSPSM
Knoxville McGhee Tyson
Thu 12/3
8:00 am-6:24 pm
1 stop10h 24m
Portsmouth Pease Intl
Thu 12/10
10:21 am-7:35 pm
1 stop9h 14m
$522
Showing 1-10 of 17 resultsSorted by cheapest first
Compare providers for flights from Knoxville to Portsmouth
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 Knoxville to Portsmouth in November.
| Provider | Price Accuracy | Trust Score* |
|---|---|---|
| Price Accuracy2 stars | Trust Score*3 stars | |
| Price Accuracy3 stars | Trust Score*3 stars |
- Most accurate provider: When it comes to deals on Knoxville-Portsmouth, New Hampshire flights, users find the pricing of FlightHub to be most consistent on Cheapflights vs. FlightHub Users can find the same prices on Knoxville-Portsmouth, New Hampshire flight deals on Cheapflights vs. FlightHub >95% of the time. Price accuracy is based on data collected from Knoxville-Portsmouth, New Hampshire flight searches over the past month and is updated monthly.
- Most trusted provider: When it comes to deals on Knoxville-Portsmouth, New Hampshire 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 Knoxville-Portsmouth, New Hampshire 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 Knoxville to Portsmouth
Have a flexible travel schedule? Discover the best time to fly to Portsmouth from Knoxville with our price prediction graph.
TYS-PSM
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.
Related info for your journey
Find useful and relevant information for your journey from Knoxville to Portsmouth. Access travel guides, tips, and recommendations to enhance your travel experience. Get information about local attractions, weather, transportation options, and more.
Browse thousands of different options on Cheapflights for your next trip
Toggle through the tabs below to find thousands of options on Cheapflights for your next trip.
Alternative routes
Complete your trip
Flights by cabin class
Other flight options
Other flights from Knoxville
Popular flights
Portsmouth flight routes