How long is the flight from Knoxville to Lisbon?

There are many flights that can get you from Knoxville to Lisbon in 23h 20m. Fly via United Airlines or British Airways to get the fastest option. The distance from Knoxville to Lisbon is about 3997 mi. This flight may include one or multiple stops.

What are the cheapest airlines flying from Knoxville to Lisbon round-trip?

Currently priced at $475, British Airways will fly you from Knoxville to Lisbon and back. In addition to British Airways, many other airlines offer competitively priced options for your trip. Check Cheapflights for deals on United Airlines for as low as $629. You may be able to fly from Knoxville to Lisbon for 54% less than the average price by searching for these airlines.

In terms of precipitation, rainfall in Lisbon ranges from 0.2 - 4.8 inches per month. December is typically the wettest month, when rainfall can reach 4.8 in. July is typically the driest time to visit Lisbon when rainfall is around 0.2 in.

If weather is an important factor for your trip to Lisbon, use this chart to help with planning. For those seeking warmer temperatures, July is the ideal time of year to visit, when temperatures reach an average of 73.4 F. Travelers looking to avoid the cold should look outside of January, when temperatures are typically at their lowest (around 51.8 F).

What is the cheapest time of day to fly from TYS to LIS?

Regardless of the time of day you decide to fly, the ticket price will remain around the same. Book flights from Knoxville to Lisbon as you normally would.

Most accurate provider : When it comes to deals on Knoxville-Lisbon flights, users find the pricing of Ovago to be most consistent on Cheapflights vs. Ovago Users can find the same prices on Knoxville-Lisbon flight deals on Cheapflights vs. Ovago >95% of the time. Price accuracy is based on data collected from Knoxville-Lisbon flight searches over the past month and is updated monthly.

Most trusted provider : When it comes to deals on Knoxville-Lisbon flights, Cheapflights users trust Ovago the most. Ovago has received a user feedback score of 3 out of 3 stars (3 being the best), meaning they have been trusted the most by Cheapflights users looking for Knoxville-Lisbon flight deals. Provider user feedback score is based on Cheapflights searches over the past month and is updated monthly.

Can I find deals for flights from Knoxville to Lisbon that include hotel bookings?

Yes. In addition to deals on Knoxville to Lisbon flights, Cheapflights offers vacation packages that include both flights and hotel.

How can I find direct flights from Knoxville to Lisbon?

After entering your origin and destination, apply the non-stop filter on the search result page to find direct flights from Knoxville to Lisbon.

Can I find deals for business class flights from Knoxville to Lisbon?

Yes. Cheapflights offers flight deals from Knoxville to Lisbon by cabin class. In addition to browsing deals, you can also filter by cabin class on the search results page after making a search.

$779+ Cheap Flights from Knoxville to Lisbon

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1. Tell us where you want to go

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2. Select your favorite providers

We find the providers serving your travel needs. Choose up to four travel providers to compare side-by-side for flights, hotels, or car rentals.

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Cheap flight deals from Knoxville to Lisbon

Cheapest

Best

Last-minute

One-way

Cheapest flights from Knoxville to Lisbon
Explore the most affordable flight options available from Knoxville to Lisbon. Find the lowest fares from popular airlines and budget airlines, with prices last updated on September 10, 2026.

Sat 9/191:53 pm -

2 stops39h 37m

Wed 9/305:05 am -

2 stops23h 54m

Deal found 9/10

$780

Sun 10/253:56 pm -

1 stop13h 09m

Sun 11/110:40 am -

2 stops18h 07m

Deal found 9/10

$831

Wed 10/76:55 pm -

2 stops23h 20m

Wed 10/146:45 pm -

2 stops34h 14m

Deal found 9/9

$915

Sat 9/194:48 pm -

2 stops20h 17m

Wed 9/306:45 pm -

2 stops33h 05m

Deal found 9/9

$941

Sun 11/1511:20 am -

1 stop15h 50m

Thu 11/1912:20 pm -

1 stop12h 16m

Deal found 9/9

$1,020

Wed 10/77:25 pm -

1 stop10h 05m

Wed 10/145:05 am -

2 stops20h 44m

Deal found 9/9

$1,029

Best flights from Knoxville to Lisbon
Discover carefully curated flight deals from Knoxville to Lisbon that have cost, travel time, and layovers in mind to ensure you get the best travel experience. Data last updated September 10, 2026.

Fri 2/197:35 pm -

2 stops54h 20m

Fri 2/2610:15 am -

1 stop15h 39m

Deal found 9/8

$779

Wed 10/76:55 pm -

2 stops23h 20m

Wed 10/146:45 pm -

2 stops34h 14m

Deal found 9/9

$915

Fri 3/57:13 pm -

2 stops22h 17m

Sun 3/143:50 pm -

2 stops36h 09m

Deal found 9/7

$942

Sun 11/151:55 pm -

1 stop15h 10m

Thu 11/1912:20 pm -

1 stop12h 16m

Deal found 9/8

$1,020

Sun 10/2511:35 am -

1 stop17h 30m

Sun 11/111:05 am -

1 stop29h 07m

Deal found 9/10

$1,016

Last-minute flights from Knoxville to Lisbon
Discover last-minute flight deals from Knoxville to Lisbon. Data last updated September 10, 2026 and is based on user searches.

Sat 9/191:53 pm -

2 stops39h 37m

Wed 9/305:05 am -

2 stops23h 54m

Deal found 9/10

$780

Sat 9/194:48 pm -

2 stops20h 17m

Wed 9/306:45 pm -

2 stops33h 05m

Deal found 9/9

$941

Sat 9/194:03 pm -

2 stops17h 52m

Wed 9/305:00 am -

2 stops21h 44m

Deal found 9/8

$1,081

Sat 9/195:45 pm -

2 stops16h 10m

Wed 9/305:35 am -

2 stops18h 22m

Deal found 9/7

$1,089

Wed 10/76:55 pm -

2 stops23h 20m

Wed 10/146:45 pm -

2 stops34h 14m

Deal found 9/9

$915

Wed 10/77:25 pm -

1 stop10h 05m

Wed 10/145:05 am -

2 stops20h 44m

Deal found 9/9

$1,029

Sun 10/253:56 pm -

1 stop13h 09m

Sun 11/110:40 am -

2 stops18h 07m

Deal found 9/10

$831

Find flight deals from Knoxville to Lisbon

Most accurate provider	Ovago 3 stars
Most trusted provider	Ovago 3 stars
Round-trip from	$655 (Delta)
Popular in	June
Cheapest in	January
Average price	$1,090

Provider with most accurate pricing for Knoxville McGhee Tyson-Lisbon Humberto Delgado flight deals.

Search Deals

Provider most trusted by Cheapflights users for Knoxville McGhee Tyson-Lisbon Humberto Delgado flights.

Search Deals

From Knoxville McGhee Tyson to Lisbon Humberto Delgado

Search Deals

Highest demand for flights based on searches. 27% potential increase in price ($400 potential increase over avg. RT price).

Search Deals

Cheapest flight prices on average. 4% potential price decrease ($45 potential savings vs. average RT price).

Search Deals

Average for round-trip flights in September 2026

Search Deals

Fly from

Fly to

Route

Depart

Return

Price

Cheapest round-trip

KnoxvilleLisbon

TYS Knoxville McGhee Tyson - LIS Lisbon Humberto Delgado

TYSLIS

Knoxville McGhee Tyson

Fri 2/19

7:35 pm-6:55 am

2 stops54h 20m

Lisbon Humberto Delgado

Fri 2/26

10:15 am-8:54 pm

1 stop15h 39m

$779

KnoxvilleLisbon

TYS Knoxville McGhee Tyson - LIS Lisbon Humberto Delgado

TYSLIS

Knoxville McGhee Tyson

Wed 10/7

6:55 pm-11:15 pm

2 stops23h 20m

Lisbon Humberto Delgado

Wed 10/14

6:45 pm-11:59 pm

2 stops34h 14m

$915

KnoxvilleLisbon

TYS Knoxville McGhee Tyson - LIS Lisbon Humberto Delgado

TYSLIS

Knoxville McGhee Tyson

Fri 3/5

7:13 pm-10:30 pm

2 stops22h 17m

Lisbon Humberto Delgado

Sun 3/14

3:50 pm-11:59 pm

2 stops36h 09m

$942

Quickest round-trip

KnoxvilleLisbon

TYS Knoxville McGhee Tyson - LIS Lisbon Humberto Delgado

TYSLIS

Knoxville McGhee Tyson

Mon 10/19

1:55 pm-11:00 am

2 stops16h 05m

Lisbon Humberto Delgado

Wed 12/31

12:00 am-6:00 pm

Nonstop0h 00m

$951

KnoxvilleLisbon

TYS Knoxville McGhee Tyson - LIS Lisbon Humberto Delgado

TYSLIS

Knoxville McGhee Tyson

Sun 10/25

11:35 am-9:05 am

1 stop17h 30m

Lisbon Humberto Delgado

Sun 11/1

11:05 am-11:12 am

1 stop29h 07m

$1,016

KnoxvilleLisbon

TYS Knoxville McGhee Tyson - LIS Lisbon Humberto Delgado

TYSLIS

Knoxville McGhee Tyson

Sun 11/15

1:55 pm-10:05 am

1 stop15h 10m

Lisbon Humberto Delgado

Thu 11/19

12:20 pm-7:36 pm

1 stop12h 16m

$1,020

KnoxvilleLisbon

TYS Knoxville McGhee Tyson - LIS Lisbon Humberto Delgado

TYSLIS

Knoxville McGhee Tyson

Mon 10/19

6:23 pm-9:45 pm

3 stops46h 22m

Lisbon Humberto Delgado

Wed 12/31

12:00 am-6:00 pm

Nonstop0h 00m

$1,816

Flights are sorted by cheapest round-trip flights first.

Deals found on 9/5

Sorted by cheapest first

Compare providers for flights from Knoxville to Lisbon

Use the table below to compare price accuracy, trust ratings, and cancellation policies for each provider offering flight deals from Knoxville to Lisbon in September.

Provider	Price Accuracy	Trust Score*
Expedia	Price Accuracy1 star	Trust Score*3 stars
Ovago	Price Accuracy3 stars	Trust Score*3 stars
FlightHub	Price Accuracy3 stars	Trust Score*3 stars
AranGrant	Price Accuracy3 stars	Trust Score*3 stars

*The Trust Score is based on feedback from users after their booking experience. It measures overall satisfaction, helping us identify issues like hidden fees, problems during the ticketing process, and the quality of customer service. This score is our best indicator of the provider's quality and reliability.

Most accurate provider: When it comes to deals on Knoxville-Lisbon flights, users find the pricing of Ovago to be most consistent on Cheapflights vs. Ovago Users can find the same prices on Knoxville-Lisbon flight deals on Cheapflights vs. Ovago >95% of the time. Price accuracy is based on data collected from Knoxville-Lisbon flight searches over the past month and is updated monthly.
Most trusted provider: When it comes to deals on Knoxville-Lisbon flights, Cheapflights users trust Ovago the most. Ovago has received a user feedback score of 3 out of 3 stars (3 being the best), meaning they have been trusted the most by Cheapflights users looking for Knoxville-Lisbon flight deals. Provider user feedback score is based on Cheapflights searches over the past month and is updated monthly.

Best time to book a flight from Knoxville to Lisbon

Have a flexible travel schedule? Discover the best time to fly to Lisbon from Knoxville with our price prediction graph.

TYS-LIS

Estimated round-trip price

Rates are based on past data. Find the cheapest month and day to book your flight based on your travel requirements, then search for cheap deals.

Cheapflights Insights

Everything you need to know about your flight from Knoxville to Lisbon

What is the cheapest month to book a flight from Knoxville to Lisbon?

Currently, January is the cheapest month in which you can book a flight from Knoxville to Lisbon (average of $527). Flying from Knoxville to Lisbon in June is currently the most expensive (average of $1,525). There are several factors that can impact the price of a flight, so comparing airlines, departure airports and flight times can provide users with more options.

Reviews of airlines servicing Lisbon

Peruse reviews from past customers who have flown with United Airlines and British Airways from Knoxville to Lisbon to help guide your decision. You can also see how each airline stacks up in terms of entertainment options, comfort, food, crew/service, and boarding process.

United Airlines

7.4

Good

10,194 reviews

Reviews

1 / 20

4.0

Okay

Chris,Aug 2026

MIA - ORD

Had to go through TSA again, already purchased bottle drink. TSA would not let through, United changed gates last minute. This experience bad for everyone. Staff rude, not our fault. Staff from Chicago to Wichita excellent!

United Airlines

7.4

Good

10,194 reviews

United Airlines

7.4

Good

10,194 reviews

Reviews

1 / 20

4.0

Okay

Chris,Aug 2026

MIA - ORD

British Airways

6.7

Okay

8,210 reviews

United Airlines

7.4

Good

10,194 reviews

Reviews

1 / 20

4.0

Okay

Chris,Aug 2026

MIA - ORD

Related info for your journey

How long is the flight from Knoxville to Lisbon?
There are many flights that can get you from Knoxville to Lisbon in 23h 20m. Fly via United Airlines or British Airways to get the fastest option. The distance from Knoxville to Lisbon is about 3997 mi. This flight may include one or multiple stops.
What are the cheapest airlines flying from Knoxville to Lisbon round-trip?
Currently priced at $475, British Airways will fly you from Knoxville to Lisbon and back. In addition to British Airways, many other airlines offer competitively priced options for your trip. Check Cheapflights for deals on United Airlines for as low as $629. You may be able to fly from Knoxville to Lisbon for 54% less than the average price by searching for these airlines.
Can I find deals for flights from Knoxville to Lisbon that include hotel bookings?
Yes. In addition to deals on Knoxville to Lisbon flights, Cheapflights offers vacation packages that include both flights and hotel.
How can I find direct flights from Knoxville to Lisbon?
After entering your origin and destination, apply the non-stop filter on the search result page to find direct flights from Knoxville to Lisbon.
Can I find deals for business class flights from Knoxville to Lisbon?
Yes. Cheapflights offers flight deals from Knoxville to Lisbon by cabin class. In addition to browsing deals, you can also filter by cabin class on the search results page after making a search.
What is the cheapest month to book a flight from Knoxville to Lisbon?
Currently, January is the cheapest month in which you can book a flight from Knoxville to Lisbon (average of $527). Flying from Knoxville to Lisbon in June is currently the most expensive (average of $1,525). There are several factors that can impact the price of a flight, so comparing airlines, departure airports and flight times can provide users with more options.

See more FAQs

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Top 2 airlines flying from Knoxville to Lisbon

Airline	Cheapest	Average	Flexibility	On-time
British Airways	Cheapest$475	Average$1,054	FlexibilityNo cancel fee	On-time70%
United Airlines	Cheapest$629	Average$1,090	FlexibilityNo cancel fee	On-time69%

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$779+ Cheap flights from Knoxville (TYS) to Lisbon (LIS)

This is the cheapest round-trip flight price found by a Cheapflights user in the last 72 hours by searching for a flight departing on 2/19. Fares are subject to change and may not be available on all flights or dates of travel.

Find cheap flights from Knoxville to Lisbon with Cheapflights

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2. Select your favorite providers

3. Compare prices and book

Cheap flight deals from Knoxville to Lisbon

Cheapest flights from Knoxville to LisbonExplore the most affordable flight options available from Knoxville to Lisbon. Find the lowest fares from popular airlines and budget airlines, with prices last updated on September 10, 2026.

Explore the most affordable flight options available from Knoxville to Lisbon. Find the lowest fares from popular airlines and budget airlines, with prices last updated on September 10, 2026.

Best flights from Knoxville to LisbonDiscover carefully curated flight deals from Knoxville to Lisbon that have cost, travel time, and layovers in mind to ensure you get the best travel experience. Data last updated September 10, 2026.

Discover carefully curated flight deals from Knoxville to Lisbon that have cost, travel time, and layovers in mind to ensure you get the best travel experience. Data last updated September 10, 2026.

Last-minute flights from Knoxville to LisbonDiscover last-minute flight deals from Knoxville to Lisbon. Data last updated September 10, 2026 and is based on user searches.

Discover last-minute flight deals from Knoxville to Lisbon. Data last updated September 10, 2026 and is based on user searches.

One-way flights from Knoxville to LisbonSearch for one-way flight options from Knoxville to Lisbon. Find affordable one-way fares based on user searches. Data last updated September 10, 2026.

Search for one-way flight options from Knoxville to Lisbon. Find affordable one-way fares based on user searches. Data last updated September 10, 2026.

Find flight deals from Knoxville to Lisbon

Most accurate provider

Most trusted provider

Round-trip from

Popular in

Cheapest in

Average price

Cheapflights Fare Finder

Use the filters below to find and compare flights from Knoxville to Lisbon that are best for you.

Compare providers for flights from Knoxville to Lisbon

Provider information is updated monthly. Please note that these providers often have deals for this flight, but the availability may vary on a day-by-day basis on Cheapflights.

Use the table below to compare price accuracy, trust ratings, and cancellation policies for each provider offering flight deals from Knoxville to Lisbon in September.

Best time to book a flight from Knoxville to Lisbon

Have a flexible travel schedule? Discover the best time to fly to Lisbon from Knoxville with our price prediction graph.

Cheapflights Insights

What is the cheapest month to book a flight from Knoxville to Lisbon?

Reviews of airlines servicing Lisbon

Peruse reviews from past customers who have flown with United Airlines and British Airways from Knoxville to Lisbon to help guide your decision. You can also see how each airline stacks up in terms of entertainment options, comfort, food, crew/service, and boarding process.

Related info for your journey

How long is the flight from Knoxville to Lisbon?

What are the cheapest airlines flying from Knoxville to Lisbon round-trip?

Can I find deals for flights from Knoxville to Lisbon that include hotel bookings?

How can I find direct flights from Knoxville to Lisbon?

Can I find deals for business class flights from Knoxville to Lisbon?

What is the cheapest month to book a flight from Knoxville to Lisbon?

Traveling to a place near Lisbon?

Browse thousands of different options on Cheapflights for your next trip

Toggle through the tabs below to find thousands of options on Cheapflights for your next trip.

Alternative routes for Knoxville to Lisbon

See prices for flight routes from nearby airports that may be better suited for you.

Complete your trip

Complete your trip to Lisbon by adding a car rental and/or hotel reservation to your travel itinerary.

Search flights from Knoxville to Lisbon by cabin class

Find flights from Knoxville to Lisbon, based on your preferred cabin class, be it economy, premium economy, business, or first class.

Other flights to Lisbon

Explore flights to Lisbon departing from other origins. Flights are based on user searches made on Cheapflights and were last updated on September 10, 2026.

Knoxville and Lisbon flights

Browse other Knoxville and Lisbon flight options. Last updated on September 10, 2026.

Other flights from Knoxville

Browse through other flights departing from Knoxville. Flights are based on user searches made on Cheapflights and were last updated on September 10, 2026.

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Top 2 airlines flying from Knoxville to Lisbon

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Cheapest flights from Knoxville to Lisbon
Explore the most affordable flight options available from Knoxville to Lisbon. Find the lowest fares from popular airlines and budget airlines, with prices last updated on September 10, 2026.

Best flights from Knoxville to Lisbon
Discover carefully curated flight deals from Knoxville to Lisbon that have cost, travel time, and layovers in mind to ensure you get the best travel experience. Data last updated September 10, 2026.

Last-minute flights from Knoxville to Lisbon
Discover last-minute flight deals from Knoxville to Lisbon. Data last updated September 10, 2026 and is based on user searches.

One-way flights from Knoxville to Lisbon
Search for one-way flight options from Knoxville to Lisbon. Find affordable one-way fares based on user searches. Data last updated September 10, 2026.