$435 Cheap Flights from Knoxville to Lisbon

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      Compare Knoxville to Lisbon flight deals

      Find the cheapest month or even day of the year to fly to Lisbon

      Book the best Lisbon fare with no extra fees

      Flight deals from Knoxville to Lisbon

      Looking for a cheap last-minute deal or the best return flight from Knoxville Airport to Lisbon Airport? If you want to travel next month, return fares start from $1,109. Find the lowest prices on one-way and return tickets right here.

      Find the cheapest month to fly from Knoxville to Lisbon

      We’re always keeping an eye on fares, so you can find the best one in seconds. It looks like Knoxville to Lisbon flights are currently cheapest in December.

      Knoxville to Lisbon: Alternative routes

      Compare routes from Knoxville to Lisbon below. You may find an airport to fly into that's cheaper, faster, or easier than Lisbon.

      Knoxville to Lisbon: Flight information

      The things to know before you go.
      Cheapest flight found$435
      Cheapest month to flyDecember

      Finding cheap flights from Knoxville to Lisbon: Frequently asked questions

      The best price we found for a return flight from Knoxville to Lisbon is $822. This is an estimate based on information collected from different airlines and travel providers over the last 4 days and is subject to change and availability.
      Currently, there are no airlines that fly direct from Knoxville to Lisbon. But we found flights with one or more stops from $822.
      As of September 2026, there are no flights flying from Knoxville to Lisbon.
      The cheapest month to fly from Knoxville to Lisbon is usually December.
      After crunching the numbers on our flight calendar, we found that it's currently cheapest to fly from Knoxville Airport to Lisbon Airport on Thursday, 10 December 2026.
      No airlines currently offer direct flights between Knoxville Airport and Lisbon Airport. Most routes have one or more stops.
      We show every price from over 1,200 airlines and travel agents, comparing them all so you don’t have to. If you know you want to fly to Lisbon but you’re not ready to book, set up a Price Alert. We’ll track prices for you, and let you know when they rise or fall.

      We crunched all the numbers in our flight calendar and it looks like the cheapest time to book a flight to Lisbon is around 40 days in advance, so don’t leave your flight to the last minute.

      Currently, Delta offers the cheapest flight tickets to Lisbon.

      Flying from Knoxville Airport (TYS) to Lisbon Airport (LIS): what you need to know

      • The timezone in Lisbon is UTC+0, which is five hours ahead of Knoxville.

      • Get to the airport on time so you don't miss your TYS to LIS flight. Be there at least two hours ahead for international flights and an hour early for domestic departures to prevent a last-minute sprint to your gate.

      • You can expect bigger queues in popular months such as October. Arriving up to four hours in advance for an international flight and two hours for domestic departures is a wise move.

      How to find the cheapest flights from Knoxville Airport (TYS) to Lisbon Airport (LIS)

      • The lowest price we've seen for a one-way Knoxville Airport to Lisbon Airport flight is $435. A return fare is currently $822. Depending on the availability and when you book, these fares may change.

      • Don't leave things to the last minute. You're more likely to get cheap tickets from TYS to LIS if you book in advance. Airlines often have some excellent early bird deals.

      • Getting cheap flights from Knoxville Airport to Lisbon Airport is easier if you're flexible with your dates. Use the 'Whole month' search tool to see the lowest prices across the month and snap up a great deal.

      • Landing cheap flights from TYS to LIS is easy with Price Alerts. Simply set up one of these automatic alerts and we'll get in touch as soon as there's a better deal.

      • Find the right flight for you by using the filters. To see the 'Cheapest,' 'Fastest' or 'Best' flights from Knoxville Airport to Lisbon Airport, use the 'Sort by' function. You can also filter by arrival and departure times, airline, and journey duration.

      Handy information about Knoxville Airport (TYS)

      • TYS is located at 2055 Alcoa Highway.

      • When it comes to Knoxville Airport's on-time performance, data shows 76% of flights stick to their scheduled arrival time.

      • To get to Knoxville Airport from central Knoxville, it takes about 25 minutes if you're planning to drive. Of course, this depends on traffic conditions. It's approximately 24 kilometres from the airport to the city centre.

      • Planning to take public transport? Expect a journey time of around 50 minutes.

      • Have an early flight from Knoxville Airport to Lisbon Airport? Avoid rushing to the airport (and enjoy a little extra shut-eye) by choosing one of these hotels near TYS:

      Arriving at Lisbon Airport (LIS)

      • Consider staying in a hotel close to LIS if you're taking a late Knoxville Airport to Lisbon Airport flight. Settle into one of these options and avoid the hassle of a long transfer:

      • Hit the road running by picking up a Lisbon Airport rental car. Grab your wheels from Klass Wagen, Goldcar or OK Mobility and experience the lesser-explored corners of Lisbon and beyond.

      • Booking your vehicle from Lisbon Airport about two weeks ahead boosts your odds of scoring a great price.

      When to fly to Lisbon Airport (LIS)

      • The quietest month for a flight from Knoxville Airport to Lisbon Airport is March, while August is the most popular. Choose the ideal time to visit Lisbon based on whether you prefer a more relaxed vibe or a faster pace.

      • Before locking in your flight from Knoxville Airport to Lisbon Airport, think about the kind of weather you like. August is the warmest month in Lisbon, with temperatures ranging from 16ºC (61ºF) to 29ºC (84ºF).

      • Search for cheap tickets from TYS to LIS in January if you'd rather travel during cooler conditions. Temperatures are at their lowest then, ranging between 8ºC (46ºF) and 16ºC (61ºF) on average.

      Explore more of Portugal

      • Lisbon is always a good idea, but there are so many other corners of Portugal waiting to be discovered. Around 274 kilometres north of Lisbon, a visit to Porto will keep you on the move. Start with popular sights like Ribeira District, Rio Douro and Livraria Lello.

      • If you're ready to explore another major destination in Portugal, head for Amadora, about 8 kilometres north-west of Lisbon. Roman Villa, Park Fantasia and Palácio dos Condes da Lousã are among its highlights.

      Prices shown on this page are estimated lowest prices only. Found in the last 12 days.