How long is the flight from Knoxville to Lisbon?

There are many flights that can get you from Knoxville to Lisbon in 37h 55m. Fly via United Airlines or Air Canada 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 $564, 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. Search Cheapflights for deals from American Airlines and United Airlines - these airlines can fly you to your destination from $602 and $633, respectively. You may be able to fly from Knoxville to Lisbon for 44% 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 are the most popular airlines that fly from Knoxville to Lisbon?

The most popular airlines flying from Knoxville to Lisbon are United Airlines, British Airways and American Airlines. Something to consider prior to booking your flight.

Most accurate provider : When it comes to deals on Knoxville-Lisbon flights, users find the pricing of CheapOair to be most consistent on Cheapflights vs. CheapOair Users can find the same prices on Knoxville-Lisbon flight deals on Cheapflights vs. CheapOair >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 CheapOair the most. CheapOair 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.

$493+ Flights from Knoxville to Lisbon

Q: How much does it cost to fly round-trip from Knoxville to Lisbon?

Airfare is below average for this route at the moment. Knoxville to Lisbon flights typically cost between $607 and $1,891 in January. The cheapest round-trip price found within the last 3 days was $493 on United Airlines (Jan 7-Jan 16).

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Cheap flight deals from Knoxville to Lisbon

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 December 12, 2025.

Sat 12/277:23 pmTYS - LIS

1 stop9h 52mUnited Airlines

Thu 1/111:55 amLIS - TYS

1 stop12h 56mUnited Airlines

Deal found 12/11

$2,428

Fri 12/125:54 pmTYS - LIS

2 stops40h 06mLufthansa

Fri 12/193:55 pmLIS - TYS

2 stops32h 56mLufthansa

Deal found 12/11

$16,132

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 December 12, 2025.

Wed 1/289:30 amTYS - LIS

2 stops42h 50mUnited Airlines

Sun 2/110:50 amLIS - TYS

2 stops39h 02mUnited Airlines

Deal found 12/11

$493

Sat 1/102:25 pmTYS - LIS

2 stops37h 55mAir Canada

Mon 1/1911:20 amLIS - TYS

2 stops32h 29mAir Canada

Deal found 12/10

$496

Wed 1/77:44 amTYS - LIS

1 stop18h 11mMultiple Airlines

Fri 1/1611:05 amLIS - TYS

1 stop14h 51mMultiple Airlines

Deal found 12/10

$506

Thu 1/156:45 amTYS - LIS

2 stops21h 35mUnited Airlines

Mon 1/1911:20 amLIS - TYS

2 stops38h 32mUnited Airlines

Deal found 12/11

$493

Sat 1/102:19 pmTYS - LIS

1 stop13h 46mMultiple Airlines

Sat 1/1710:40 amLIS - TYS

1 stop15h 16mMultiple Airlines

Deal found 12/11

$506

Thu 1/811:07 amTYS - LIS

2 stops16h 03mUnited Airlines

Mon 1/1911:20 amLIS - TYS

2 stops32h 29mUnited Airlines

Deal found 12/10

$494

Thu 1/157:44 amTYS - LIS

1 stop20h 21mMultiple Airlines

Mon 1/1911:05 amLIS - TYS

1 stop14h 51mMultiple Airlines

Deal found 12/11

$506

Thu 1/89:05 amTYS - LIS

2 stops19h 15mUnited Airlines

Fri 1/165:00 amLIS - TYS

2 stops20h 52mUnited Airlines

Deal found 12/9

$497

Thu 1/89:30 amTYS - LIS

2 stops17h 40mUnited Airlines

Wed 1/145:00 amLIS - TYS

2 stops19h 27mUnited Airlines

Deal found 12/10

$498

Sat 1/106:59 amTYS - LIS

2 stops20h 56mUnited Airlines

Sat 1/176:10 amLIS - TYS

2 stops18h 17mUnited Airlines

Deal found 12/11

$499

Fri 1/91:59 pmTYS - LIS

2 stops14h 21mUnited Airlines

Fri 1/165:00 amLIS - TYS

2 stops20h 52mUnited Airlines

Deal found 12/9

$500

Fri 1/91:59 pmTYS - LIS

2 stops14h 21mUnited Airlines

Thu 1/155:00 amLIS - TYS

2 stops20h 52mUnited Airlines

Deal found 12/10

$500

Last-minute flights from Knoxville to Lisbon
Discover last-minute flight deals from Knoxville to Lisbon. Data last updated December 12, 2025 and is based on user searches.

Wed 1/711:40 amTYS - LIS

2 stops40h 40mUnited Airlines

Fri 1/1611:20 amLIS - TYS

2 stops37h 07mUnited Airlines

Deal found 12/10

$493

Wed 1/77:20 pmTYS - LIS

2 stops33h 00mMultiple Airlines

Sat 1/176:10 amLIS - TYS

2 stops18h 17mMultiple Airlines

Deal found 12/10

$504

Wed 1/77:44 amTYS - LIS

1 stop18h 11mMultiple Airlines

Fri 1/1611:05 amLIS - TYS

1 stop14h 51mMultiple Airlines

Deal found 12/10

$506

Wed 1/77:20 pmTYS - LIS

2 stops33h 00mAir Canada

Sat 1/1711:20 amLIS - TYS

2 stops28h 37mAir Canada

Deal found 12/10

$512

Thu 1/811:07 amTYS - LIS

2 stops16h 03mUnited Airlines

Mon 1/1911:20 amLIS - TYS

2 stops32h 29mUnited Airlines

Deal found 12/10

$494

Thu 1/89:05 amTYS - LIS

2 stops19h 15mUnited Airlines

Fri 1/165:00 amLIS - TYS

2 stops20h 52mUnited Airlines

Deal found 12/9

$497

Thu 1/811:07 amTYS - LIS

2 stops16h 03mUnited Airlines

Thu 1/155:00 amLIS - TYS

2 stops20h 52mUnited Airlines

Deal found 12/10

$498

Thu 1/86:45 amTYS - LIS

2 stops20h 25mUnited Airlines

Tue 1/1310:15 amLIS - TYS

2 stops29h 42mUnited Airlines

Deal found 12/10

$510

Fri 1/91:59 pmTYS - LIS

2 stops14h 21mAir Canada

Mon 1/1911:20 amLIS - TYS

2 stops32h 29mAir Canada

Deal found 12/10

$496

Fri 1/99:30 amTYS - LIS

2 stops18h 50mUnited Airlines

Wed 1/145:00 amLIS - TYS

2 stops20h 52mUnited Airlines

Deal found 12/10

$500

Sat 1/106:59 amTYS - LIS

2 stops20h 56mUnited Airlines

Sat 1/176:10 amLIS - TYS

2 stops18h 17mUnited Airlines

Deal found 12/11

$499

Sat 1/107:20 pmTYS - LIS

2 stops35h 15mLufthansa

Sun 1/185:00 amLIS - TYS

2 stops20h 52mLufthansa

Deal found 12/10

$513

Find flight deals from Knoxville to Lisbon

Most accurate provider	CheapOair 3 stars
Most trusted provider	CheapOair 3 stars
Round-trip from	$493 (United Airlines)
Popular in	June
Cheapest in	February
Average price	$804

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. 30% potential increase in price ($434 potential increase over avg. RT price).

Search Deals

Cheapest flight prices on average. 6% potential price decrease ($66 potential savings vs. average RT price).

Search Deals

Average for round-trip flights in December 2025

Search Deals

Fly from

Fly to

Route

Depart

Return

Price

KnoxvilleLisbon

TYS - LIS

TYSLIS

Knoxville McGhee Tyson

Wed 1/28

9:30 am-9:20 am

2 stops42h 50m

Lisbon Humberto Delgado

Sun 2/1

10:50 am-8:52 pm

2 stops39h 02m

$493

KnoxvilleLisbon

TYS - LIS

TYSLIS

Knoxville McGhee Tyson

Thu 1/15

6:45 am-9:20 am

2 stops21h 35m

Lisbon Humberto Delgado

Mon 1/19

11:20 am-8:52 pm

2 stops38h 32m

$493

KnoxvilleLisbon

TYS - LIS

TYSLIS

Knoxville McGhee Tyson

Thu 1/8

11:07 am-8:10 am

2 stops16h 03m

Lisbon Humberto Delgado

Mon 1/19

11:20 am-2:49 pm

2 stops32h 29m

$494

KnoxvilleLisbon

TYS - LIS

TYSLIS

Knoxville McGhee Tyson

Sat 1/10

2:25 pm-9:20 am

2 stops37h 55m

Lisbon Humberto Delgado

Mon 1/19

11:20 am-2:49 pm

2 stops32h 29m

$496

KnoxvilleLisbon

TYS - LIS

TYSLIS

Knoxville McGhee Tyson

Thu 1/8

9:05 am-9:20 am

2 stops19h 15m

Lisbon Humberto Delgado

Fri 1/16

5:00 am-8:52 pm

2 stops20h 52m

$497

KnoxvilleLisbon

TYS - LIS

TYSLIS

Knoxville McGhee Tyson

Thu 1/8

9:30 am-8:10 am

2 stops17h 40m

Lisbon Humberto Delgado

Wed 1/14

5:00 am-7:27 pm

2 stops19h 27m

$498

KnoxvilleLisbon

TYS - LIS

TYSLIS

Knoxville McGhee Tyson

Sat 1/10

6:59 am-8:55 am

2 stops20h 56m

Lisbon Humberto Delgado

Sat 1/17

6:10 am-7:27 pm

2 stops18h 17m

$499

KnoxvilleLisbon

TYS - LIS

TYSLIS

Knoxville McGhee Tyson

Fri 1/9

1:59 pm-9:20 am

2 stops14h 21m

Lisbon Humberto Delgado

Fri 1/16

5:00 am-8:52 pm

2 stops20h 52m

$500

KnoxvilleLisbon

TYS - LIS

TYSLIS

Knoxville McGhee Tyson

Fri 1/9

1:59 pm-9:20 am

2 stops14h 21m

Lisbon Humberto Delgado

Thu 1/15

5:00 am-8:52 pm

2 stops20h 52m

$500

KnoxvilleLisbon

TYS - LIS

TYSLIS

Knoxville McGhee Tyson

Wed 1/7

7:44 am-6:55 am

1 stop18h 11m

Lisbon Humberto Delgado

Fri 1/16

11:05 am-8:56 pm

1 stop14h 51m

$506

Flights are sorted by cheapest round-trip flights first.

Deals found on 12/11

Showing 1-10 of 12 results

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 December.

Provider	Price Accuracy	Trust Score*
Expedia	Price Accuracy2 stars	Trust Score*3 stars
FlightHub	Price Accuracy3 stars	Trust Score*1 star
eDreams	Price Accuracy3 stars	Trust Score*3 stars
AranGrant	Price Accuracy2 stars	Trust Score*3 stars
CheapOair	Price Accuracy3 stars	Trust Score*3 stars
Ovago	Price Accuracy2 stars	Trust Score*2 stars
Cheapflightsfares	Price Accuracy3 stars	Trust Score*2 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 CheapOair to be most consistent on Cheapflights vs. CheapOair Users can find the same prices on Knoxville-Lisbon flight deals on Cheapflights vs. CheapOair >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 CheapOair the most. CheapOair 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.

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, December is the cheapest month in which you can book a flight from Knoxville to Lisbon (average of $475). Flying from Knoxville to Lisbon in May is currently the most expensive (average of $1,125). 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.

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

When flying from Knoxville to Lisbon, the time of day you fly usually plays a role in the price. Save by searching for a flight in the morning, which can drop the price by up to 34% versus a flight in the afternoon.

What is the cheapest day to fly from Knoxville to Lisbon?

Travelers seeking maximum savings on their Knoxville to Lisbon flight should consider departing on Tuesday at noon when fares are most often at their lowest. Wednesday at noon flights should be avoided if possible as fares are typically the most expensive at this time.

How much does it cost to fly round-trip from Knoxville to Lisbon?

Reviews of airlines servicing Lisbon

Peruse reviews from past customers who have flown with United Airlines, American 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

9,095 reviews

Reviews

1 / 20

10.0

Excellent

Sunderesh,Dec 2025

AUS - EWR

Smooth flight from Austin to Newark. The crew was friendly.

United Airlines

7.4

Good

9,095 reviews

United Airlines

7.4

Good

9,095 reviews

Reviews

1 / 20

10.0

Excellent

Sunderesh,Dec 2025

AUS - EWR

Smooth flight from Austin to Newark. The crew was friendly.

American Airlines

7.2

Good

11,048 reviews

United Airlines

7.4

Good

9,095 reviews

Reviews

1 / 20

10.0

Excellent

Sunderesh,Dec 2025

AUS - EWR

Smooth flight from Austin to Newark. The crew was friendly.

British Airways

6.7

Okay

7,571 reviews

United Airlines

7.4

Good

9,095 reviews

Reviews

1 / 20

10.0

Excellent

Sunderesh,Dec 2025

AUS - EWR

Smooth flight from Austin to Newark. The crew was friendly.

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 37h 55m. Fly via United Airlines or Air Canada 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 $564, 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. Search Cheapflights for deals from American Airlines and United Airlines - these airlines can fly you to your destination from $602 and $633, respectively. You may be able to fly from Knoxville to Lisbon for 44% 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, December is the cheapest month in which you can book a flight from Knoxville to Lisbon (average of $475). Flying from Knoxville to Lisbon in May is currently the most expensive (average of $1,125). 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

Fátima

Oeiras

Ericeira

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Torres Vedras

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Other flights to Lisbon

Top 3 airlines flying from Knoxville to Lisbon

Airline	Cheapest	Average	Flexibility	On-time
British Airways	Cheapest$564	Average$955	FlexibilityNo cancel fee	On-time70%
American Airlines	Cheapest$602	Average$1,004	FlexibilityNo cancel fee	On-time71%
United Airlines	Cheapest$633	Average$1,046	FlexibilityNo cancel fee	On-time69%

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$493+ 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 1/28. 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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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 December 12, 2025.

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 December 12, 2025.

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 December.

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

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?

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

What is the cheapest day to fly from Knoxville to Lisbon?

How much does it cost to fly round-trip from Knoxville to Lisbon?

Reviews of airlines servicing Lisbon

Peruse reviews from past customers who have flown with United Airlines, American 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

Find useful and relevant information for your journey from Knoxville to Lisbon. Access travel guides, tips, and recommendations to enhance your travel experience. Get information about local attractions, weather, transportation options, and more.

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

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Alternative routes for Knoxville to Lisbon

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

Top 3 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 December 12, 2025.