$537 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 1/7. 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$537
Porto
Porto2 stops$696
Funchal
Funchal2 stops$639
Lisbon
Lisbon2 stops$537
Porto
Porto2 stops$696
Funchal
Funchal2 stops$639

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 7 - Sat, Jan 17
Air Canada Logo
7:20 pm - 9:20 amTYS-LIS
33h 00m2 stops
Air Canada Logo
11:20 am - 2:49 pmLIS-TYS
32h 29m2 stops
$537Air Canada
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Wed, Jan 7 - Sat, Jan 17
Air Canada Logo
2:25 pm - 9:20 amTYS-LIS
37h 55m2 stops
Air Canada Logo
11:20 am - 7:27 pmLIS-TYS
37h 07m2 stops
$538Air Canada
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Fri, Nov 28 - Fri, Dec 5
United Airlines Logo
9:50 am - 10:15 amTYS-LIS
19h 25m1 stop
United Airlines Logo
11:20 am - 1:17 pmLIS-TYS
30h 57m2 stops
$539United Airlines
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Fri, Nov 28 - Fri, Dec 5
United Airlines Logo
9:50 am - 8:10 amTYS-LIS
17h 20m2 stops
United Airlines Logo
11:20 am - 7:54 pmLIS-TYS
37h 34m2 stops
$543United Airlines
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Fri, Nov 28 - Fri, Dec 5
Multiple Airlines Logo
7:35 am - 8:50 amTYS-LIS
20h 15m1 stop
Multiple Airlines Logo
11:05 am - 8:53 pmLIS-TYS
14h 48m1 stop
$555Multiple Airlines
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Fri, Dec 12 - Fri, Dec 19
Multiple Airlines Logo
5:24 am - 8:50 amTYS-LIS
22h 26m2 stops
Multiple Airlines Logo
11:05 am - 8:43 pmLIS-TYS
14h 38m1 stop
$563Multiple Airlines
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Fri, Mar 6 - Sat, Mar 14
British Airways Logo
6:35 am - 12:05 pmTYS-LIS
24h 30m2 stops
British Airways Logo
6:40 pm - 9:14 pmLIS-TYS
54h 34m2 stops
$807British Airways
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Fri, Mar 6 - Sat, Mar 14
American Airlines Logo
6:35 am - 7:55 amTYS-LIS
20h 20m1 stop
American Airlines Logo
10:30 am - 12:04 amLIS-TYS
17h 34m2 stops
$1,523American Airlines
Find Deal
Fri, Mar 6 - Sat, Mar 14
American Airlines Logo
6:35 am - 7:55 amTYS-LIS
20h 20m1 stop
American Airlines Logo
10:30 am - 8:39 pmLIS-TYS
14h 09m1 stop
$1,632American Airlines
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Wed, Apr 15 - Wed, Apr 22
British Airways Logo
6:25 pm - 9:05 amTYS-LIS
9h 40m1 stop
British Airways Logo
3:10 pm - 7:26 pmLIS-TYS
33h 16m2 stops
$2,093British Airways
Find Deal
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 February, when tickets cost $638 (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$537
Best time to beat the crowds with an average 33% drop in price.
Most popular time to fly and prices are also 20% 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 8998 reviews
7.1Entertainment
7.7Boarding
6.6Food
8.1Crew
7.3Comfort
Airline reviews

Flight was delayed only slightly before takeoff due to traffic control. However, the flight arrived early to ORD. Good flight. United has been very reliable for me.

10.0 ExcellentDr. Joseph, Oct 2025STL - ORD
Read more United Airlines reviews

Flight was delayed only slightly before takeoff due to traffic control. However, the flight arrived early to ORD. Good flight. United has been very reliable for me.

The person I bought the ticket for didn’t make the flight.

Lately I like the planes have been exceptionally filthy. There’s lines of dust and dirt all across the ceiling in the vents, and the cracks in between the seats are literally full of food. It’s definitely not the quality of service that I was used to with United. I’m also very disappointed with the Wi-Fi! All I wanna do is knock out a few work jobs while I’m trapped in my seat And it spools so bad. They did provide me with a refund, but the process of getting that refund is so complicated. It’s unfortunate.

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

Excellent flight. Smooth, efficient boarding. Quick flight. Arrived early at STL.

After boarding the plane in Chicago, the passengers were told that there was a technical problem with the plane. Passengers remained on the plane as they tried to fix the problem. After what was probably an hour passengers were told that there was a need to change planes as the problem was not solved. Passengers disembarked and boarded another plane. After taxing to the runway and waiting for takeoff, passengers were told that owing to the thunderstorm the flight was unable to take off but would try and reroute. After some time passengers were told there wasn't enough fuel for the new route and the plane had to return to the gate for additional fuel. after another log delay the flight got underway. On the plane there was food, drinks, ice or entertainment. We were a glass of water, which appeared rationed. Flight arrived about 5 hours late. The pilot was fantastic and communicated with the passengers throughout the ordeal.

Same as last comment. Food sucks. Quality. Not surprising most people have no clue about nourishment Clearly

Not the fault of United—weather, reroute around weather, time sitting on tarmac, arrived couple hours late, too late for train into city necessitating a much pricier cab but weather…can’t be helped.

Friendly and professional flight crew. Aside from departure delay after boarding, easy flight and smooth landing.

Great smooth flight. Had a seating change, but that was an improvement. Thanks United Airways Crew.

Wish some foods provided rather than just biscuit/cookie for flight more than 2 hours

Wish a flight with more than 2 hours with some snack rather than just cookie/biscuit.

The flight attendant, a black woman with curly hair who sat near Row 21, was wonderful and kind.

It was good..clean, comfy seat. Friendly warm welcoming crew. Was able to check my cabin luggage at the gate which I was able to pickup in a decent time from baggage claim. The app gave all updates from delays to baggage claim info. Overall smooth flight.

Flight was delayed leaving Dallas. Arrived about 2 hours later than scheduled.

Flight delayed and missed connection. Rescheduled flight cancelled after 6 hrs wait. Rerouted thru ORD, flight cancelled, overnight stay in ORD. Still in the air on new flight!

We are too tired and frustrated to comment politely at this point

Terrible. Our luggage was delayed and couldn’t be delivered for several days. We got bad information from the airline agents at baggage claim. We had to pick up our car so we wouldn’t be charged for an extra day. We got lost in the maze of airport parking. The baggage claim agents didn’t offer us any compensation for our extra time and expense. We are tired, hungry and very frustrated.

The flight was flawless and we even arrived between 20 and 25 minutes early!

The only thing to like was that we eventually got to our destination

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.

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 leg from Portland to Heathrow was great for a business class ticket. The BA leg from Heathrow to Lisbon was terrible. Basically coach seating with an empty seat between you and next passenger. Absolutely no leg room. Should not have been charged for business class and it was a 3 hour flight.

The flat beds. Other than that, the place was not clean.

Moved me away from my family and refused to fix it.

I have always been pleased with their service. Would not change a thing

Seating and food was the worst we have experienced in 35 years of traveling for both personal and busines .

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

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