$721 Find Cheap Flights from Knoxville to Portugal - Compare and Save

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Cheap Flights from Knoxville to Portugal

Cheapest round-trip prices found by our users on KAYAK in the last 5 days
Lisbon
Lisbon1 stop$727
Porto
Porto1 stop$721
Funchal
Funchal2 stops$1,352
Lisbon
Lisbon1 stop$727
Porto
Porto1 stop$721
Funchal
Funchal2 stops$1,352
Booking Insights

Price, demand and travel trends for Knoxville to Portugal flights

Use KAYAK data on prices, travel dates, airlines and seasonal trends to compare options and book flights with more confidence.

What are the cheapest fares from Knoxville to Portugal right now?

The cheapest fares from Knoxville to Portugal on KAYAK in the last week were to Porto (OPO) from $721 round-trip, and to Lisbon Humberto Delgado (LIS) from $727 round-trip.

What’s the cheapest month to fly from Knoxville to Portugal?

January is the cheapest time of year to fly, with average fares of $508. Prices are highest in June, when average flight costs increase to around $1,525.

Which airport in Portugal is the cheapest to fly to from Knoxville?

Based on KAYAK data from the past 12 months, the cheapest airports to fly into Portugal are:

• Porto (OPO) (avg. price $934)
• Lisbon Humberto Delgado (LIS) (avg. price $1,007)

What’s the cheapest day to fly from Knoxville to Portugal?

Wednesday tends to be the cheapest day to fly from Knoxville to Portugal, while Saturday is the most expensive. Fares run about 44% higher that day, based on the past 12 months of KAYAK data.

What's the cheapest time of day to fly from Knoxville to Portugal?

Data from the past 12 months shows it's cheapest to fly to Portugal during the afternoon with average prices of $830. The evening is the most expensive time to fly, with average prices of $1,142.

Key details for Knoxville to Portugal flights

Low season

October

Cheapest flight

$721
Beat the crowds with an average 56% drop in travelers.
The most popular month to fly with an average 69% increase in travelers.
Round-trip flight from Knoxville to Porto

Your Knoxville to Portugal flight questions, answered

Find helpful answers about this route, including flight times, airports, airlines and booking tips.

  • Is now a good time to book a flight from Knoxville to Portugal?

    Fares from Knoxville to Portugal are around their usual level right now. A round-trip under $686 is considered a good deal, so it's worth keeping an eye out, or setting a Price Alert to catch price changes.

  • How much should I budget for a flight from Knoxville to Portugal?

    Over the past 12 months, round-trip fares from Knoxville to Portugal have ranged from $686 to $1,395.

  • Which cabin classes are available on flights from Knoxville to Portugal?

    On flights from Knoxville to Portugal you can book Economy Class, Premium Economy Class, Business Class or First Class.

  • What are some popular landmarks in Portugal?

    KAYAK travelers' favorite landmarks in Portugal include:

    • Chiado
    • Ribeira Square
    • Avenida dos Aliados
    • Commerce Square

Your guide to booking Knoxville to Portugal flights

Get tips on when to book, when to fly and what to know before your trip.
  • If your travel dates are flexible, book your trip for January when flights are typically cheapest and avoid June when prices are at their highest.
  • Flying on Wednesday is usually the cheapest. Flights on Saturday cost about 44% more on average, so being flexible with your travel dates could help you save.
  • If you're looking to save, Porto (OPO) is the cheapest airport to fly into from Knoxville. If you have onward travel, don't forget to factor in the cost of your journey by train, bus or domestic flight.
  • Start your trip in Lisbon, which is the most popular destination in Portugal. From there, it's easy to continue on to other popular destinations such as Porto, Albufeira and Funchal.

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.
7.3
United AirlinesOverall score based on 10463 reviews
7.1Entertainment
7.7Boarding
6.7Food
7.3Comfort
8.1Crew
Airline reviews

My easiest trip ever. Flights left on time, and came in a few minutes early. The flights weren’t full so it was very comfortable. Thank you United

10.0 ExcellentNancy, Oct 2026
Read more United Airlines reviews

My easiest trip ever. Flights left on time, and came in a few minutes early. The flights weren’t full so it was very comfortable. Thank you United

The united employees at the gate treated me very rudely and called me nefarious

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.

Flight was fine. We were in business class, so lie-flat seats were appreciated. Kids were in premium and said it was nice. Flight was delayed by 3 hours, so we missed everything we had planned in London the first day.

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.

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.

More options for your flight from Knoxville to Portugal

Complete your trip to Portugal with a hotel stay or car rental