$347 Find Cheap Flights from Knoxville to Portugal

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 10/10. 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$852
Porto
Porto2 stops$953
Funchal
Funchal2 stops$1,883
Lisbon
Lisbon2 stops$852
Porto
Porto2 stops$953
Funchal
Funchal2 stops$1,883

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

Sat, Sep 19 - Wed, Sep 30
United Airlines Logo
7:20 pm - 8:20 am
TYS
-
LIS
32h 00m
2 stops
United Airlines Logo
5:05 am - 9:45 am
LIS
-
TYS
33h 40m
2 stops
$852United Airlines
Sat, Sep 19 - Wed, Sep 30
United Airlines Logo
7:20 pm - 8:20 am
TYS
-
LIS
32h 00m
2 stops
United Airlines Logo
5:05 am - 9:45 am
LIS
-
TYS
33h 40m
2 stops
$853United Airlines
Sat, Sep 19 - Wed, Sep 30
United Airlines Logo
6:00 pm - 9:20 am
TYS
-
LIS
34h 20m
2 stops
United Airlines Logo
5:05 am - 9:00 pm
LIS
-
TYS
20h 55m
2 stops
$857United Airlines
Fri, Oct 16 - Sun, Oct 25
United Airlines Logo
9:45 am - 9:20 am
TYS
-
LIS
18h 35m
2 stops
United Airlines Logo
1:00 pm - 7:36 pm
LIS
-
TYS
34h 36m
2 stops
$875United Airlines
Tue, Aug 18 - Tue, Sep 1
Multiple Airlines Logo
1:00 pm - 10:30 am
TYS
-
LIS
16h 30m
1 stop
Multiple Airlines Logo
11:25 am - 11:59 pm
LIS
-
TYS
41h 34m
2 stops
$899Multiple Airlines
Tue, Aug 18 - Tue, Sep 1
Multiple Airlines Logo
7:00 am - 9:20 am
TYS
-
LIS
21h 20m
2 stops
Multiple Airlines Logo
11:25 am - 11:59 pm
LIS
-
TYS
41h 34m
2 stops
$903Multiple Airlines
Sat, Sep 19 - Wed, Sep 30
United Airlines Logo
7:20 pm - 10:35 am
TYS
-
LIS
10h 15m
1 stop
United Airlines Logo
5:05 am - 9:45 am
LIS
-
TYS
33h 40m
2 stops
$908United Airlines
Fri, Oct 16 - Sun, Oct 25
United Airlines Logo
9:45 am - 9:20 am
TYS
-
LIS
18h 35m
2 stops
United Airlines Logo
1:00 pm - 7:17 pm
LIS
-
TYS
34h 17m
2 stops
$911United Airlines
Tue, Aug 18 - Tue, Sep 1
British Airways Logo
11:08 am - 9:05 am
TYS
-
LIS
16h 57m
1 stop
British Airways Logo
11:05 am - 8:07 pm
LIS
-
TYS
14h 02m
1 stop
$919British Airways
Tue, Aug 4 - Tue, Aug 11
KLM Logo
5:22 pm - 7:30 pm
TYS
-
FAO
21h 08m
2 stops
KLM Logo
9:10 pm - 5:42 pm
FAO
-
TYS
25h 32m
2 stops
$985KLM
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 December, when tickets cost $475 (return) on average. On the other hand, the most expensive months are June and August, when the average cost of round-trip tickets is $1,183 and $1,028 respectively.

Good to know

Low seasonFebruary
Cheapest flight$347
Best time to beat the crowds with an average 51% drop in price.
Most popular time to fly and prices are also 18% 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 9870 reviews
7.1Entertainment
8.1Crew
7.7Boarding
6.6Food
7.3Comfort
Airline reviews

Lost one piece of luggage even though I checked in 2.5 hours before the flight

6.0 Goodmerrill, Jun 2026
SFO - MCO
Read more United Airlines reviews

Lost one piece of luggage even though I checked in 2.5 hours before the flight

It was Swiss. Our kosher meals were literally frozen solid and therefore inedible, and the crew didnt care.

For the expense of first class, the seats could have been nicer and higher tier snacks would have been nice.

The boarding process on the departure from LA was rather slow even though I was in Group 1. For first class, I was not expecting to have to pay for Wi-fi but I did and then the wi-fi was spotty. The entree was surprisingly good and so that was a pleasant surprise. However, once I got to Houston, it was terrible. Unfortunately there was bad weather but the constant gate changes for my connecting flight was difficult to manage due to having to navigate back and forth between different terminals.

We used Kayak to reserve our tickets and specifically checked the luggage option which was a more expensive option. When we arrived at the terminal we had to pay an extra $90 per suitcase for the three passengers. This has been a pattern for the past 3 years. Why charge for a more expensive luggage option, and the ticket price not include luggage?

They delayed the flight 3 hours because it wasn't full they moved us to 5 different gates probably the worst airline ever not even spirit is this bad.

Very easy ! Use the kiosk and bag drop and right to security within 10 min

Checking bag at terminal was horrible. No agents to check us in and only 1 kiosk working. Boarding went ok. Crew onboard was very scattered rained. Missed our row while serving and then didn’t see them hardly again.

Crew was amazing, takeoff wonderful. The bathroom was disgusting from before takeoff the odor made the flight uncomfortable as you could smell the bathroom from the center of the plane where we were sitting. Smelled like raw sewage. My daughter was throwing up as we landed due to the smell and horrible turbulence as we approached Newark.

Airline tickets are not cheap. You expect reliable competent service. Thanks to canceled flights and botched transfers we arrived at our destination two days late. This is not acceptable

Thanks to a delay of an hour of my flight to Philadelphia on American Airlines I missed my connecting flight to Amsterdam. On arrival at Philadelphia he crew on the delayed flight did not ask the passengers to let connecting passengers get off first and I arrived a few minutes after boarding was closed at the original time for the flight to AMS, this despite the fact that I had received a message from American Airlines that departure was delayed by 25 minutes. Overall very poor service, no effort from the part of American Airlines to accommodate the passenger, just rebook the flight for the next day.

It's hard to tell where to plug in electronics, and the port on my seat didn't work. Their entertainment system was down. Vegetarian food options were tasty. Friendly, helpful flight attendants.

Boarding process was chaotic. Confusion over Boarding gates: gate 55 or gate 56 ???. Unnecessary standing in long lines to board. Better to call out Boarding groups one at a time and everyone else to sit. Airline only has 2 Boarding groups 1-3 and 4-9. That causes over crowding and chaos

Lady next to me was coughing profusely the entire flight, other lady moved seats because of it, 8 hours of that during an overnight flight is a bit much.

The flight was ok. The seats are so small. The free wifi for members was not an option on this flight. The one flight attendant, older woman with straight white/grey hair, was very rude. The gentleman next to me asked about the wifi since he was a member as well. He stated, accurately, that the option to enter the idea number was not available. Her response was, "I don't know what to tell you" and walked away from him. The rest of the staff was wonderful. I asked another flight attendant about the wifi, she said the free wifi was not enabled on that flight (true or not- at least she was friendly). It was also pretty dirty. When I opened the tray table it had mushed crumbs and there was a dirty used pair of ear buds in my seat pocket. Lastly the air vent above my head was working but stuck so I was unable to move it to face me when it got warm. I fly American often but this really was not a great flight.

My luggage was lost at the airport but American Airlines contacted me and got it to me the next day.

24 hour delays aren’t even heard in 3rd world countries with archaic transportation systems. I’m never flying American Airlines again.

3.5 hr delay leaving Pittsburgh, notifications for which were incomplete and untimely. Connecting flight was automatically switched to one requiring more than a 30 hour layover! After waiting in a long queue, customer service reduced layover to 11 hours and also set up an earlier standby. The standby had empty seats, but the gate agent couldn't change our tickets! On top of all that my luggage was lost and has yet to even be located, much less returned 5 (FIVE!) days later. Too bad there's no rating below poor.

Canceled flight late London to Florence. Help at airport very poor. Treated poorly. Had to sleep in the airport. Lost bags- still do not have them. Horrible. I should be reimbursed!

The seats are extra cramped if you are taller than 5’8! Spring for the extra legroom seats for sure if you have a long flight!

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

Information on your arrival and departure airports