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Lisbon

$361+ Cheap flights from Knoxville (TYS) to Lisbon (LIS)

This is the cheapest one-way flight price found by a Cheapflights user in the last 72 hours by searching for a flight departing on 9/14. Fares are subject to change and may not be available on all flights or dates of travel.
TYS — LIS
Aug 23 — Aug 301
Sun 8/23
Sun 8/30
1 adult, Economy
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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 July 24, 2026.

This United Airlines deal was found by Cheapflights users on 7/19. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 12/610:16 am
TYS
-
LIS
1 stop18h 49m
United Airlines
Wed 12/95:00 am
LIS
-
TYS
2 stops21h 05m
United Airlines
Deal found 7/19$753
This United Airlines deal was found by Cheapflights users on 7/23. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 12/610:16 am
TYS
-
LIS
1 stop18h 49m
United Airlines
Sun 12/1310:50 am
LIS
-
TYS
2 stops31h 28m
United Airlines
Deal found 7/23$786
This United Airlines deal was found by Cheapflights users on 7/22. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 9/288:30 am
TYS
-
LIS
1 stop18h 50m
United Airlines
Tue 10/66:45 am
LIS
-
TYS
2 stops32h 00m
United Airlines
Deal found 7/22$799

Find flight deals from Knoxville to Lisbon

Discover tips and strategies to find the most affordable flight options for your journey from Knoxville (TYS) to Lisbon (LIS). Learn about various techniques such as flexible date searches, comparing prices across and setting up price alerts. Use these methods to find the cheapest flights available for your travel needs. Data last updated July 24, 2026.

Most accurate provider

Ovago
3 stars

Most trusted provider

Ovago
3 stars

Round-trip from

$753
(United Airlines)

One-way from

$361
(Kiwi.com)

Popular in

June

Cheapest in

January

Average price

$1,310
Provider with most accurate pricing for Knoxville McGhee Tyson-Lisbon Humberto Delgado flight deals.
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Provider most trusted by Cheapflights users for Knoxville McGhee Tyson-Lisbon Humberto Delgado flights.
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From Knoxville McGhee Tyson to Lisbon Humberto Delgado
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One-way flight from Knoxville McGhee Tyson to Lisbon Humberto Delgado
Search Deals
Highest demand for flights based on searches. 27% potential increase in price ($379 potential increase over avg. RT price).
Search Deals
Cheapest flight prices on average. 4% potential price decrease ($48 potential savings vs. average RT price).
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Average for round-trip flights in July 2026
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Cheapflights Fare Finder

 
Customize your flight search to find flights from Knoxville to Lisbon that fit within your specific budget. Explore options based on user searches and filter the results based on your desired price range. Find flights that match your budget for a cost-effective journey. Over the last 7 days, Cheapflights users made 2,558,603 searches. Data last updated July 24, 2026.
Use the filters below to find and compare flights from Knoxville to Lisbon that are best for you.

Fly from

Fly to

Route

Depart

Return

Price

Cheapest round-trip

KnoxvilleLisbon

TYS - LIS

TYSLIS

Knoxville McGhee Tyson

Sun 12/6

10:16 am-10:05 am

1 stop18h 49m

Lisbon Humberto Delgado

Wed 12/9

5:00 am-9:05 pm

2 stops21h 05m

$753

KnoxvilleLisbon

TYS - LIS

TYSLIS

Knoxville McGhee Tyson

Sun 12/6

8:30 am-10:05 am

2 stops20h 35m

Lisbon Humberto Delgado

Sun 12/13

10:50 am-1:18 pm

2 stops31h 28m

$790

KnoxvilleLisbon

TYS - LIS

TYSLIS

Knoxville McGhee Tyson

Mon 9/28

6:00 am-9:20 am

2 stops22h 20m

Lisbon Humberto Delgado

Tue 10/6

5:05 am-9:45 am

2 stops33h 40m

$803

KnoxvilleLisbon

TYS - LIS

TYSLIS

Knoxville McGhee Tyson

Sat 9/19

7:20 pm-8:20 am

2 stops32h 00m

Lisbon Humberto Delgado

Wed 9/30

5:05 am-8:19 pm

2 stops20h 14m

$912

KnoxvilleLisbon

TYS - LIS

TYSLIS

Knoxville McGhee Tyson

Tue 9/8

1:10 pm-10:30 am

1 stop16h 20m

Lisbon Humberto Delgado

Tue 9/15

11:25 am-4:58 pm

2 stops34h 33m

$942

KnoxvilleLisbon

TYS - LIS

TYSLIS

Knoxville McGhee Tyson

Tue 9/1

7:20 pm-10:30 am

1 stop10h 10m

Lisbon Humberto Delgado

Wed 9/30

6:45 am-8:19 pm

2 stops18h 34m

$946
Quickest round-trip

KnoxvilleLisbon

TYS - LIS

TYSLIS

Knoxville McGhee Tyson

Tue 9/8

7:20 pm-10:30 am

1 stop10h 10m

Lisbon Humberto Delgado

Wed 9/16

12:20 pm-11:59 pm

1 stop16h 39m

$962
Cheapest one-way

KnoxvilleLisbon

TYS - LIS

TYSLIS

Knoxville McGhee Tyson

Mon 9/14

9:10 am-9:10 pm

3 stops31h 00m

$361
Quickest one-way

KnoxvilleLisbon

TYS - LIS

TYSLIS

Knoxville McGhee Tyson

Fri 10/30

4:52 pm-12:05 pm

2 stops15h 13m

$6,297

Flights are sorted by cheapest round-trip flights first.

Deals found on 7/23

Sorted by cheapest first

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 July.
ProviderPrice AccuracyTrust Score*
ExpediaPrice Accuracy1 starTrust Score*3 stars
OvagoPrice Accuracy3 starsTrust Score*3 stars
FlightHubPrice Accuracy3 starsTrust Score*3 stars
AranGrantPrice Accuracy3 starsTrust 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.
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.

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 $1,041 and $1,871 in December.
The cheapest round-trip price found within the last 5 days was $753 on United Airlines (Dec 6-Dec 9).

Reviews of airlines servicing Lisbon

Get insights into the airlines that provide service to Lisbon. Read reviews, discover amenities, and learn about the overall travel experience offered by airlines. Use this information to make informed decisions when choosing an airline for your flight to Lisbon. Reviews last updated July 24, 2026.
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
10,032 reviews

Crew

8.1

Food

6.6

Comfort

7.3

Boarding

7.7

Overall

7.4

Entertainment

7.1

Reviews

1 / 20
6.0
Good

ROHIT,Jun 2026

IND - EWR

It should not be delayed by 2 hours. I missed the important event due to this
United Airlines
7.4
Good
10,032 reviews
United Airlines
7.4
Good
10,032 reviews

Crew

8.1

Food

6.6

Comfort

7.3

Boarding

7.7

Overall

7.4

Entertainment

7.1

Reviews

1 / 20
6.0
Good

ROHIT,Jun 2026

IND - EWR

It should not be delayed by 2 hours. I missed the important event due to this
British Airways
6.7
Okay
8,132 reviews
United Airlines
7.4
Good
10,032 reviews

Crew

8.1

Food

6.6

Comfort

7.3

Boarding

7.7

Overall

7.4

Entertainment

7.1

Reviews

1 / 20
6.0
Good

ROHIT,Jun 2026

IND - EWR

It should not be delayed by 2 hours. I missed the important event due to this

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?

    There are many flights that can get you from Knoxville to Lisbon in 18h 49m. Fly via United Airlines to get the fastest option. The distance from Knoxville to Lisbon is about 3997 mi.

  • 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 52% 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

Traveling to a place near Lisbon?

Book flights to Lisbon if you plan to visit one of these locations
Fátima
Ericeira
Oeiras
Beja
Torres Vedras
Nazaré
Colares
Sesimbra

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.
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Memphis to Lisbon flights
Nashville to Porto flights
Chattanooga to Lisbon flights

Top 2 airlines flying from Knoxville to Lisbon

Discover the top 2 airlines that operate flights from Knoxville to Lisbon. Compare their services, reliability, and customer satisfaction ratings to choose the airline that best suits your travel preferences and needs. Over the last 7 days, Cheapflights users made 2,558,603 searches. Data last updated July 24, 2026.
AirlineCheapestAverageFlexibilityOn-time
British AirwaysCheapest$475Average$973FlexibilityNo cancel feeOn-time70%
United AirlinesCheapest$629Average$1,050FlexibilityNo cancel feeOn-time69%

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