$551 Find Cheap Flights from Knoxville to Portugal - Compare and Save

This is the cheapest one-way flight price found by a KAYAK user in the last 72 hours by searching for a flight from Knoxville to Portugal departing on 9/27. Fares are subject to change and may not be available on all flights or dates of travel. Click the price to replicate the search for this deal.
1 adult
1 adult, Economy, 0 bags

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Cheap Flights from Knoxville to Portugal

Cheapest round-trip prices found by our users on KAYAK in the last 72 hours
Lisbon
Lisbon2 stops$747
Porto
Porto2 stops$1,021
Funchal
Funchal2 stops$1,456
Lisbon
Lisbon2 stops$747
Porto
Porto2 stops$1,021
Funchal
Funchal2 stops$1,456

Book Cheap Knoxville to Portugal Plane Tickets

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

Recent round-trip flight deals from Knoxville to Portugal

Sun, Dec 13 - Wed, Dec 23
Delta Logo
6:00 am - 8:00 amTYS  Knoxville McGhee Tyson-LIS Lisbon Humberto Delgado
21h 00m2 stops Atlanta Hartsfield-Jackson New York John F Kennedy Intl
Delta Logo
5:30 am - 9:45 pmLIS  Lisbon Humberto Delgado-TYS Knoxville McGhee Tyson
21h 15m2 stops Paris Charles de Gaulle Atlanta Hartsfield-Jackson
$747Delta
Sun, Dec 13 - Wed, Dec 23
British Airways Logo
7:38 am - 9:05 amTYS  Knoxville McGhee Tyson-LIS Lisbon Humberto Delgado
20h 27m1 stop Philadelphia
British Airways Logo
11:05 am - 10:24 amLIS  Lisbon Humberto Delgado-TYS Knoxville McGhee Tyson
28h 19m1 stop Philadelphia
$752British Airways
Mon, Nov 16 - Wed, Nov 18
Air Canada Logo
5:45 am - 10:40 amTYS  Knoxville McGhee Tyson-LIS Lisbon Humberto Delgado
23h 55m2 stops Washington, D.C. Dulles Intl Montreal Pierre Elliott Trudeau Intl
Air Canada Logo
11:20 am - 11:59 pmLIS  Lisbon Humberto Delgado-TYS Knoxville McGhee Tyson
41h 39m2 stops Toronto Pearson Intl Washington, D.C. Dulles Intl
$753Air Canada
Mon, Nov 16 - Wed, Nov 18
United Airlines Logo
7:35 pm - 10:20 amTYS  Knoxville McGhee Tyson-LIS Lisbon Humberto Delgado
9h 45m1 stop Washington, D.C. Dulles Intl
United Airlines Logo
11:55 am - 11:59 pmLIS  Lisbon Humberto Delgado-TYS Knoxville McGhee Tyson
17h 04m1 stop Washington, D.C. Dulles Intl
$765United Airlines
Sun, Dec 6 - Wed, Dec 9
United Airlines Logo
7:35 pm - 10:05 amTYS  Knoxville McGhee Tyson-LIS Lisbon Humberto Delgado
9h 30m1 stop Washington, D.C. Dulles Intl
United Airlines Logo
10:15 am - 8:54 pmLIS  Lisbon Humberto Delgado-TYS Knoxville McGhee Tyson
15h 39m1 stop Newark
$765United Airlines
Mon, Nov 16 - Wed, Nov 18
United Airlines Logo
9:58 am - 10:40 amTYS  Knoxville McGhee Tyson-LIS Lisbon Humberto Delgado
19h 42m2 stops Newark Montreal Pierre Elliott Trudeau Intl
United Airlines Logo
11:55 am - 7:36 pmLIS  Lisbon Humberto Delgado-TYS Knoxville McGhee Tyson
12h 41m1 stop Washington, D.C. Dulles Intl
$769United Airlines
Sun, Dec 13 - Wed, Dec 23
British Airways Logo
7:38 am - 5:45 pmTYS  Knoxville McGhee Tyson-LIS Lisbon Humberto Delgado
29h 07m2 stops Philadelphia London Heathrow
British Airways Logo
11:05 am - 8:43 pmLIS  Lisbon Humberto Delgado-TYS Knoxville McGhee Tyson
14h 38m1 stop Philadelphia
$772British Airways
Sun, Dec 13 - Wed, Dec 23
American Airlines Logo
7:38 am - 9:05 amTYS  Knoxville McGhee Tyson-LIS Lisbon Humberto Delgado
20h 27m1 stop Philadelphia
American Airlines Logo
11:05 am - 8:43 pmLIS  Lisbon Humberto Delgado-TYS Knoxville McGhee Tyson
14h 38m1 stop Philadelphia
$786American Airlines
Sun, Dec 13 - Wed, Dec 23
British Airways Logo
7:38 am - 12:05 pmTYS  Knoxville McGhee Tyson-LIS Lisbon Humberto Delgado
23h 27m2 stops Philadelphia London Heathrow
British Airways Logo
12:55 pm - 8:43 pmLIS  Lisbon Humberto Delgado-TYS Knoxville McGhee Tyson
36h 48m2 stops London Heathrow Philadelphia
$792British Airways
Sat, Jan 30 - Sat, Feb 6
American Airlines Logo
7:45 am - 9:05 amTYS  Knoxville McGhee Tyson-LIS Lisbon Humberto Delgado
20h 20m1 stop Philadelphia
American Airlines Logo
11:05 am - 8:56 pmLIS  Lisbon Humberto Delgado-TYS Knoxville McGhee Tyson
14h 51m1 stop Philadelphia
$846American Airlines
Booking Insights

KAYAK's insights & trends for Knoxville to Portugal flights

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

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

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

The cheapest month for flights from Knoxville to Portugal is January, when tickets cost $527 (return) on average. On the other hand, the most expensive months are June and July, when the average cost of round-trip tickets is $1,525 and $1,460 respectively.

Good to know

Low season

August

Cheapest flight

$551
Best time to beat the crowds but there is an average 21% increase in price.
Most popular time to fly and prices are also 22% lower on average.
Flight from Knoxville to Lisbon

FAQs - booking Portugal flights

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

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

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

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

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

    Hacker Fares allow you to combine one-way tickets in order to save you money over a traditional round-trip ticket. You could then fly from Knoxville to Portugal with an airline and back with another airline.

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

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

Reviews of the top airlines flying from Knoxville to Portugal

 
Need help choosing which airline to fly with from Knoxville to Portugal? KAYAK airline reviews give an overall score for each airline based on loads of factors, including comfort, boarding, in-flight entertainment and more, to make your decision easier. See airline scores according to verified KAYAK customer reviews.
7.4
United AirlinesOverall score based on 10072 reviews
6.7Food
7.3Comfort
8.1Crew
7.1Entertainment
7.7Boarding
Airline reviews

The head rest is too big and cannot be placed differently/removed. Causes one head to tilt forward and increase back pain

8.0 ExcellentKatiuscia, Jul 2026
Read more United Airlines reviews

The head rest is too big and cannot be placed differently/removed. Causes one head to tilt forward and increase back pain

Our flight to Rome, Italy was cancelled the day of and we were never informed. We only found out because I was trying to get into my husbands account and called to get his account number. Had to pay more for worse seating on another airline.

I wish there were outlets to charge my iPhone. The crew was great; we had a female pilot who was great with explaining what was happening and delays,

The staff was hospitable and professional. The seat had a bit of wear. The winner shade was stuck 1/4 open. I received the best of both worlds. The morning sun was able to come in and blind the screen i was trying to use while at the same time it was too low to look out and enjoy the view. Rather embarrassing for a 1st class ticket.

Even though we were delayed, we were able to make our connection

Another delayed flight. When the delays exceed the duration of the flight, it’s a problem.

Trip was great. A wild landing in Ottawa with the wind and rain, but the pilot did a great job. Always love flying United.👍

The internet service I paid for didn’t work at all and the flight crew was not very friendly.

The planes are so dirty! Food crumbs and finger print smudges, Dust over the vents and carpet stains. It’s disgusting.

Overall it was good. The flight was bumpy at times, but the pilot made us aware every time. As a result, no snacks/drinks were made available. Seats were tight but that’s okay as I had a window seat.

It was not British Air, we were put onto Air Portugal for our London to Lisbon leg.

Seat pitch is not enough to eat comfortably. When seat in front is reclined, your screen comes closer to your face. Ryanair seats are actually more comfortable.

Horrible leg room - coach seating with empty seat in middle on a 3 across seating. You buy business class for comfort which includes leg room. Absolutely no entertainment options either. Awful experience

The on flight entertainment system touch screen system and the USB charger did not work on multiple seats on least 4 seats an in different rows. The attendant tried to reset the system but was un successful. I couldn't change my phone to get my ticket for my next flight. This was an international flight I changed seats and the problem was the same. the flight attendant offered his power bank

Business class was nothing more than Economy with middle seat empty. Uncomfortable seat and leg room. A mom behind me had a 18 month/2 yr old on her lap, who had his feet on my back all the time- while middle seat remained empty. Pretty much not worth the fare. Very disappointed.

The crew were professional and friendly. It was the most uncomfortable international flight I've ever flown. Crammed in passengers. No overhead space to put my bag. No leg room and unable to recline seat due to seats too close together so it upset passenger behind me! Upgrade price to get 2 inches of more space unreasonable.

Once again I purchase a business class ticket and the seat is exactly the same as cattle class, the only difference being is that BA install a janky table over the middle seat so there is somewhere to place your complimentary drink, the tray table is just big enough for the small tray, so if you are not concerned about getting fed and watered on the plane or getting access to the BA lounge I would save your money and fly cattle, PS the cabin crew were exceptional in every way, shame about the equipment

Pilots seemed fine but one stewardess seemed crabby, but it was tolerable just didn't seem to be projecting a service attitude. I understand we all have those days. Return flight on 8/8/24 noticeable better / normal.

When bussing people to/from the gate, don't pack everyone in like a can of sardines and don't send the bus on its way if the plane isn't ready. Waited for about 40 minutes packed in this bus...both ways!

It said that there was wifi. During the flight there was no wifi and while waiting at the gate the phone services already got cut off so I wasn’t able to say I am taxiing from the gate to my husband. This left me with an uncomfortable feeling. So I was waiting on the WiFi connection during flight and that never happened.

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

Information on your arrival and departure airports