$632 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 10/13. 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

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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$632
Porto
Porto2 stops$689
Funchal
Funchal2 stops$1,089
Lisbon
Lisbon2 stops$632
Porto
Porto2 stops$689
Funchal
Funchal2 stops$1,089

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

Mon, Oct 13 - Mon, Nov 24
British Airways Logo
6:15 pm - 11:10 pmTYS-LIS
23h 55m2 stops
British Airways Logo
6:35 pm - 9:04 pmLIS-TYS
31h 29m2 stops
$632British Airways
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Thu, Dec 4 - Wed, Dec 10
United Airlines Logo
7:25 pm - 10:15 amTYS-LIS
9h 50m1 stop
United Airlines Logo
11:00 am - 11:44 pmLIS-TYS
41h 44m2 stops
$639United Airlines
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Thu, Dec 4 - Wed, Dec 10
British Airways Logo
10:57 am - 9:05 amTYS-LIS
17h 08m1 stop
British Airways Logo
6:30 am - 8:40 pmLIS-TYS
19h 10m2 stops
$648British Airways
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Fri, Oct 24 - Tue, Nov 4
United Airlines Logo
7:00 am - 8:20 amTYS-LIS
20h 20m2 stops
United Airlines Logo
5:00 am - 8:20 pmLIS-TYS
20h 20m2 stops
$649United Airlines
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Wed, Jan 7 - Sat, Jan 17
American Airlines Logo
9:08 am - 6:55 amTYS-LIS
16h 47m2 stops
American Airlines Logo
10:30 am - 11:45 pmLIS-TYS
18h 15m2 stops
$660American Airlines
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Thu, Sep 25 - Thu, Oct 2
American Airlines Logo
7:18 am - 9:05 amTYS-LIS
20h 47m1 stop
American Airlines Logo
11:05 am - 5:43 pmLIS-TYS
11h 38m1 stop
$1,000American Airlines
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Thu, Dec 4 - Mon, Dec 8
KLM Logo
7:15 pm - 5:50 pmTYS-FNC
41h 35m2 stops
KLM Logo
10:25 am - 9:32 pmFNC-TYS
40h 07m2 stops
$1,089KLM
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Thu, Dec 4 - Mon, Dec 8
KLM Logo
7:15 pm - 5:50 pmTYS-FNC
41h 35m2 stops
KLM Logo
10:25 am - 9:32 pmFNC-TYS
40h 07m2 stops
$1,105KLM
Find Deal
Tue, Aug 26 - Tue, Sep 2
Lufthansa Logo
7:25 pm - 10:30 amTYS-LIS
10h 05m1 stop
Lufthansa Logo
12:20 pm - 11:57 pmLIS-TYS
16h 37m1 stop
$1,178Lufthansa
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Wed, Dec 3 - Sun, Dec 7
Lufthansa Logo
7:25 pm - 2:30 pmTYS-FNC
38h 05m2 stops
Lufthansa Logo
3:20 pm - 7:29 pmFNC-TYS
33h 09m2 stops
$1,193Lufthansa
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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 $629 (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 $1,359 respectively.


Good to know

Low seasonJanuary
Cheapest flight$632
Best time to beat the crowds with an average 36% drop in price.
Most popular time to fly and prices are also 24% 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.

  • 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 8896 reviews
8.1Crew
7.7Boarding
7.3Comfort
7.1Entertainment
6.6Food
Airline reviews

Was on time until within 1 hour of flight-how does that happen? Staff very friendly.

8.0 ExcellentHal, Jul 2025IAD - MSY
Read more United Airlines reviews

Was on time until within 1 hour of flight-how does that happen? Staff very friendly.

the delay for 3 hours was understandable due to weather conditions but the flight should’ve provided some on flight compensations or at least provide more food.

Weather delay in Chicago?. No sense of urgency to make connection in Chicago for our connecting flight that wasn't delayed. Connection was missed.

Our flight was understandably diverted to a small regional airport in Laramie, Wyoming due to weather conditions, which I fully recognize and appreciate. However, the low rating stems from the experience that followed: passengers remained on board for over an hour without the option to deplane and stretch, despite the aircraft being stationary. Although the pilot opened the cabin door, only he was permitted to exit. Meanwhile, passengers grew increasingly uncomfortable as warm summer air entered the cabin through the open door, and being in the second row meant we were impacted immediately. While the flight attendants made efforts to keep everyone at ease, I believe allowing passengers to deplane briefly, given the extended delay, would have significantly improved the overall experience.

I never flew. Flight was canceled. DIA worst airport in the country. Avoid at all costs.

I learned that seating towards the end of plane that a line forms for the restroom and people use your chair as a hand railing, bumping your seat consistently. I was seated in the aisle. I think that next time if I am towards the back row I would want to sit in the middle or window seat.

The best airline I have ever travel , really good customer service, attention and service !!

United could have one single once of customer service. No human United employee would help me with the invalid mileage plus number, they said I had to speak with the computer.

United sent me a mileage plus number last year but that number is invalid so I can’t use it to check into flights or collect mileage. There is human to speak about the problem, only computers who keep asking me if I am using the correct email. It’s so frustrating and I cannot resolve it.

It was delayed instead of departing at 9:20pm, we departed at 11pm… putting us in Columbus after 2am! It was awful. Had I known about the delay, I could have spent some time in the United Lounge… I was starving because I started my journey in Budapest… so I was exhausted and hungry. Plus I had to make new arrangements to be picked up at the airport in Columbus, instead of midnight it was 2:30 am after getting luggage and out of airport. Not feasible. I would have just stayed in Chicago for the night and gotten a morning flight.

Very poor delay in dfw was really bad n long

Our flight was 1.5 hours delayed. There was no weather for the inbound flight, so I don't understand why. This meant a VERY late arrival and only a quick nap before my morning flight.

Because of rescheduling, they had to put me on a flight that didn't go through Dallas

It was very difficult to stretch my knee out and I am very short. I also had a torn tendon in my knee which made it extra uncomfortable anyways. My husband is 6'2" and I can't imagine him flying in that plane.

3 hour weather delay followed by 1 hour (and counting) maintenance delay. UGH!

Couldn’t get the door on the plane to close leading to a nearly 2 hour delay. But, hey at least they didn’t cancel the flight.

Flight was cancelled 3 hrs AFTER etd. Thetefore Missed connection from JFK to New Zealand . No accommodation provided… This cost ne aporox 1000 USD in extra expenses and turned whst should have been a 24 hr trip ftom Boston - New Zealand into a VERY expensive , late 70+ hr nightmare … Complete nonsense!!!

After we'd boarded , they canceled the flight. The crew didn't even know , we just all received text messages. Then after they deplaned us , AA was just like "too bad, go F your self, we sure ain't gonna help you"

The plane was broken so we had to change planes.

The flight got delayed 2.5 hrs due to a maintenance issue that cause a domino effect. American should have spare planes for when something like this happens.

My experience with British Airways is excellent, thanks for all 🫶🏻✈️

Old tired plane, Uncomfortable business class seat. Breakfast dreadful and meagre. At least flight was on time!

Safe arrival. Improvement on Time efficiency Effective Communication will be great.

The crew is very friendly and helpful. The food is good for airplane food. The flight is long and hard to sleep. The leg space is great. The plane arrived in plenty of time.

A good flight back to Tampa and thankfully although we had a 90 minute delay because of thunder storms from Charlotte to bottom iof Florida, it was a prudent to avoid these for a comfortable flight as opposed to being tossed around with turbulence.

They removed our booking without telling us. Cost us thousands to book last minute

Enjoyable flight, helpful crew everything was organized to accommodate passengers.

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

Captain sick. Unable to get replacement so delayed me 30 hours, many others delayed 54 hours. TOTALLY DESTROYED ALL MY PLANS, including lost my rental car which would now cost over 5 times what I paid so stuck with buses n trains... lost hotel reservations.... HORRIBLE!!!

The international flight from PHL to Lisbon was one of the worst I’ve experienced, ever. What was really disappointing was the entire experience of comfort and service in the coach cabin after takeoff. The food was inedible and the wine served with dinner was such low quality - it tasted of petrol. I couldn’t eat more than a bite or two of the chicken entree, being worried it would make me ill. The service took so long to reach the entire coach cabin, I ended up having the lights turned off on me as though I had to rush though dinner (though as I mentioned, it wasn’t as if I ate much - only the salad). Most of the attendants seemed generally annoyed and were not friendly or polite. While there was some turbulence, it wasn’t too uncomfortable and I know that is just a chance. The temperature of the cabin was so warm, even a friend a row or two up and on the other side of the plane felt like this. To top it all off, the seat was so uncomfortable and flattened/overused, I had back pains for DAYS afterward.

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