$488 Find Cheap Flights from Knoxville to Portugal

This is the cheapest round-trip flight price found by a KAYAK user in the last 72 hours by searching for a flight from Knoxville to Portugal departing on 1/28. 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$488
Porto
Porto2 stops$491
Funchal
Funchal2 stops$1,404
Lisbon
Lisbon2 stops$488
Porto
Porto2 stops$491
Funchal
Funchal2 stops$1,404

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

Wed, Jan 28 - Sun, Feb 1
Multiple Airlines Logo
7:20 pm - 9:20 am
TYS
-
LIS
33h 00m2 stops
Multiple Airlines Logo
5:00 am - 7:27 pm
LIS
-
TYS
19h 27m2 stops
$488Multiple Airlines
Thu, Jan 15 - Sat, Jan 24
United Airlines Logo
6:59 am - 9:20 am
TYS
-
LIS
21h 21m2 stops
United Airlines Logo
11:20 am - 8:52 pm
LIS
-
TYS
38h 32m2 stops
$490United Airlines
Thu, Jan 29 - Thu, Feb 5
Multiple Airlines Logo
2:25 pm - 9:20 am
TYS
-
LIS
37h 55m2 stops
Multiple Airlines Logo
5:00 am - 8:52 pm
LIS
-
TYS
20h 52m2 stops
$492Multiple Airlines
Wed, Jan 28 - Sun, Feb 1
United Airlines Logo
7:20 pm - 9:20 am
TYS
-
LIS
33h 00m2 stops
United Airlines Logo
10:50 am - 8:52 pm
LIS
-
TYS
39h 02m2 stops
$493United Airlines
Fri, Jan 16 - Wed, Jan 21
United Airlines Logo
6:45 am - 8:10 am
TYS
-
LIS
20h 25m2 stops
United Airlines Logo
11:20 am - 1:24 pm
LIS
-
TYS
31h 04m2 stops
$494United Airlines
Thu, Jan 15 - Sat, Jan 24
British Airways Logo
2:19 pm - 12:10 pm
TYS
-
LIS
16h 51m2 stops
British Airways Logo
10:40 am - 8:56 pm
LIS
-
TYS
15h 16m1 stop
$495British Airways
Thu, Jan 15 - Sat, Jan 24
Multiple Airlines Logo
2:19 pm - 9:05 am
TYS
-
LIS
13h 46m1 stop
Multiple Airlines Logo
10:40 am - 8:56 pm
LIS
-
TYS
15h 16m1 stop
$506Multiple Airlines
Fri, Feb 27 - Sat, Mar 21
British Airways Logo
6:40 am - 2:50 pm
TYS
-
LIS
27h 10m2 stops
British Airways Logo
12:55 pm - 9:05 pm
LIS
-
TYS
36h 10m2 stops
$507British Airways
Mon, Jan 5 - Wed, Jan 14
Lufthansa Logo
7:23 pm - 12:15 pm
TYS
-
FNC
35h 52m2 stops
Lufthansa Logo
3:20 pm - 7:27 pm
FNC
-
TYS
33h 07m2 stops
$1,404Lufthansa
Mon, Jan 5 - Wed, Jan 14
Air Canada Logo
2:00 pm - 1:35 pm
TYS
-
FNC
18h 35m3 stops
Air Canada Logo
7:50 am - 10:57 am
FNC
-
TYS
32h 07m3 stops
$1,821Air Canada
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 May, when the average cost of round-trip tickets is $1,724 and $1,449 respectively.

Good to know

Low seasonJanuary
Cheapest flight$488
Best time to beat the crowds with an average 48% drop in price.
Most popular time to fly with an average 9% increase in price.
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.

  • What is the cheapest time of day to fly to Portugal?

    The cheapest time of day to fly to Portugal is generally in the morning, when round-trip flights cost $745 on average. Morning departures are around 34% cheaper than evening flights, on average. The most expensive time of day to fly to Portugal is generally in the evening, which is peak travel time and where the average cost of a ticket is $1,134.

Reviews of the top 3 airlines serving 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 9094 reviews
8.1Crew
6.6Food
7.3Comfort
7.7Boarding
7.1Entertainment
Airline reviews

The flight was on time. I generally don’t drink or eat on short flights and the seats were good and the flight attendants were friendly. That’s all I expect

10.0 ExcellentRoger, Dec 2025
CAE - ORD
Read more United Airlines reviews

The flight was on time. I generally don’t drink or eat on short flights and the seats were good and the flight attendants were friendly. That’s all I expect

It was nice to have gotten up upgraded to first class with a meal on a three hour flight

Not great experience - we were super late boarding due to issues with aircraft. Then when we finally all got onboard and seated and they started taxiing out to the runway they just stopped then turned around and went back to the airport. Apparently the crew “ran out of time” to legally fly us. They mentioned that they were about 2 minutes away from taking off. I understand the rules and safety but kinda wonder why they would have bothered boarding us in the first place? Had to go all the way back and de plane and then wait in a HUGE line to get a hotel (this is somewhere around 2:30am) finally got to hotel by Uber (no shuttle after 20min so gave up) and they ended up putting us all back on the same aircraft at 10am next morning so got about 2.5 hours sleep. They did give us. $250 credit, but it was a São Paulo Brazil flight out of Dulles. The flight and everything was fine.

United overall experience is great these days. Airport experience was very organized. Staff on flight were great. App and information as good as it gets.

United have really come back. Airport and boarding process is clear and good, app and information also very good

They charged a fee for 1st bag checked. Others in same party were free.

Flight was delayed 8 times. We were sitting at the airport for 14 hours. We got 2 hours of sleep (if that) on what was not meant to be a red-eye.

The movies offered were great. Staff were very pleasant and very efficient.

After a delay at the gate, C3, at Ohare on Sunday, I left my Blk ski coat on the bench at the gate, lost! Please review my lob claim, thx.

Very bad! They kept delaying my flight and wouldn’t do anything about it

Gate was overcrowded. Gate agents performed very well. Flight crew was top notch! Efficient & professional & courteous. Both meals not thermalized well. Dinner main dish was actually cold in the center. Almost inedible. Breakfast sandwich was lukewarm.

The boarding was as always, the crew tried their best but not enough. The food was a disaster I had dietary restrictions that were half met because the company did not loaded the food for the flight. The entertainment screen was fine but content was not and also they removed the free messaging option from the flight and they charged 30 dollars for that crappy bandwidth. This flight is not worth the cost and the company is going down on quality.

Not comparable to Qatar Airways services on flights to Doha. Flight attendants provided basic services; I was never recognized by name or as an Executive Platinum member. Restrooms were not kept clean during the flight.

Awful. They won’t help me with anything. I booked on American but they abdicated to Iberia. The ticket was overpriced. Everything negative

it was fine, decent flight... dont get food besides cookies or pretzels so not sure why you ask about food. same for entertainment..

I got sick nothing contagious but distressing and the care I received by Kayla? Keighly the flight attendant will be memorable for ever. Thank You

I got sick nothing contagious but distressing enough and the care I received on the flight was astounding.

Waaay too small plane. They also need to up the size of the overhead bins. I would love to keep me 3k with of camera equipment in my hard case baggahe instead of it being thrown into the belly of the plane

Attendants were pleasant and the flight was smooth and relaxed.

A little late at the start but all worked out well.

Check in was was and the agent was very friendly and helpful The lounge was nice...boarding was straight from the lounge Everything worked at our seats, and video entertainment was good ..food was mediocre

The flight was excellent in World Travellor plus. Well worth the extra money. Boarding at Phoenix was the usual poorly organized event. Very stressful.

Although business class, the seating was really cramped. The food was so so.

Smooth trip no turbulence which is always a bonus for me lol! In cattle class so an element of being a bit squished (but not as bad as other shorter haul airlines) smaller plane than the one we flew out on and entertainment system wasn’t as modern but still definitely passed the time. Lovely crew x

I was attacked in the Miami airport and the staff did nothing. On my flight from London to Miami one of the flight attendants screamed at me and demanded I keep my seat in the upright position at all times during the fight so the man behind me was comfortable for the flight. I will never in my life use British airways again

Airlines have to stop assuming passengers bring entertainment. Provide it like you used to in business class and above!! N

I don't know about the others but the flight attendant that took care of us had the absolute wrong approach "how do we dare asking for water or anything else for that matter"

Flying on the Boeing 787 from Seattle to London was everything that I expected. Every thing was great.

Not my definition of first class. No leg room and barely any recline. The food was good. The crew was great. The comfort for the price I paid for London to Cairo was highway robbery. The Wi-Fi didn't work for me either.

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.

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

Information on your arrival and departure airports