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Portugal

$345+ Cheap flights from Knoxville (TYS) to Portugal

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 11/19. Fares are subject to change and may not be available on all flights or dates of travel.
TYS — LIS
Dec 13 — Dec 201
Sat 12/13
Sat 12/20
1 adult, Economy
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Find flight deals from Knoxville to Portugal

Cheapest flights from Knoxville to Portugal
Explore the most affordable flight options available from Knoxville to Portugal. Find the lowest fares from popular airlines and budget airlines, with prices last updated on November 13, 2025.

This KLM deal was found by Cheapflights users on 11/12. 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 KLM is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 12/36:00 pmTYS - FNC
2 stops42h 10mKLM
Sun 12/710:10 amFNC - TYS
2 stops42h 08mKLM
Deal found 11/12$716
This Lufthansa deal was found by Cheapflights users on 11/10. 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 Lufthansa is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 12/37:25 pmTYS - FNC
2 stops16h 45mLufthansa
Sat 12/64:10 amFNC - TYS
2 stops20h 19mLufthansa
Deal found 11/10$1,832
This Mytrip deal was found by Cheapflights users on 11/12. 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 Mytrip is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 12/272:23 pmTYS - LIS
3 stops26h 02mMultiple Airlines
Sat 1/311:20 amLIS - TYS
3 stops25h 58mMultiple Airlines
Deal found 11/12$2,007
This Ovago deal was found by Cheapflights users on 11/12. 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 Ovago is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 12/272:00 pmTYS - LIS
1 stop15h 15mLufthansa
Sat 1/311:55 amLIS - TYS
1 stop12h 56mLufthansa
Deal found 11/12$2,469
This Gotogate deal was found by Cheapflights users on 11/12. 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 Gotogate is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 12/272:00 pmTYS - FNC
2 stops39h 35mLufthansa
Fri 1/24:10 amFNC - TYS
2 stops20h 41mLufthansa
Deal found 11/12$4,138
This SmartFares deal was found by Cheapflights users on 11/12. 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 SmartFares is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 12/272:00 pmTYS - FNC
2 stops39h 35mMultiple Airlines
Sat 1/38:00 pmFNC - TYS
2 stops32h 59mMultiple Airlines
Deal found 11/12$4,586

Cheap flight deals from Knoxville to Portugal

Keep the following information in mind while searching for Knoxville to Portugal flight deals. Data was last updated November 13, 2025.

Most accurate provider

CheapOair
3 stars

Most trusted provider

CheapOair
3 stars

Round-trip from

$483
(United Airlines)

One-way from

$345
(Trip.com)

Popular in

December

Cheapest in

February

Average price

$973
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 Portugal
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One-way flight from Knoxville McGhee Tyson to Portugal
Search Deals
Highest demand for flights based on searches. 7% potential increase in price ($84 potential increase over avg. RT price).
Search Deals
Cheapest flight prices on average. 7% potential price decrease ($74 potential savings vs. average RT price).
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Average for round-trip flights in November 2025
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Cheapflights Fare Finder

 
Customize your flight search to find flights from Knoxville to Portugal 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 November 13, 2025.
Use the filters below to find and compare flights from Knoxville to Portugal that are best for you.

Fly from

Knoxville

Fly to

Portugal

Route

Depart

Return

Price

KnoxvilleLisbon

TYS - LIS

TYSLIS

Knoxville McGhee Tyson

Wed 1/7

5:29 pm-9:20 am

2 stops34h 51m

Lisbon Humberto Delgado

Sat 1/17

11:20 am-2:49 pm

2 stops32h 29m

$483

KnoxvilleLisbon

TYS - LIS

TYSLIS

Knoxville McGhee Tyson

Fri 1/23

11:07 am-8:10 am

2 stops16h 03m

Lisbon Humberto Delgado

Fri 1/30

11:20 am-2:49 pm

2 stops32h 29m

$494

KnoxvilleFaro

TYS - FAO

TYSFAO

Knoxville McGhee Tyson

Sat 2/21

1:30 pm-6:00 pm

2 stops23h 30m

Faro

Sat 2/28

9:15 am-11:50 pm

2 stops19h 35m

$496

KnoxvilleLisbon

TYS - LIS

TYSLIS

Knoxville McGhee Tyson

Fri 1/23

7:44 am-8:50 am

1 stop20h 06m

Lisbon Humberto Delgado

Fri 1/30

6:30 am-10:47 pm

2 stops21h 17m

$504

KnoxvilleLisbon

TYS - LIS

TYSLIS

Knoxville McGhee Tyson

Wed 1/7

7:44 am-6:55 am

1 stop18h 11m

Lisbon Humberto Delgado

Sat 1/17

10:40 am-8:56 pm

1 stop15h 16m

$506

KnoxvilleFunchal

TYS - FNC

TYSFNC

Knoxville McGhee Tyson

Mon 2/2

1:00 pm-9:35 am

2 stops39h 35m

Funchal Madeira

Sat 2/28

6:40 pm-8:02 pm

2 stops30h 22m

$506

KnoxvilleLisbon

TYS - LIS

TYSLIS

Knoxville McGhee Tyson

Tue 4/21

7:00 am-9:20 am

3 stops21h 20m

Lisbon Humberto Delgado

Sun 4/26

5:05 am-8:46 pm

2 stops20h 41m

$639

KnoxvilleFunchal

TYS - FNC

TYSFNC

Knoxville McGhee Tyson

Wed 12/3

6:00 pm-5:10 pm

2 stops42h 10m

Funchal Madeira

Sun 12/7

10:10 am-11:18 pm

2 stops42h 08m

$716

KnoxvilleFaro

TYS - FAO

TYSFAO

Knoxville McGhee Tyson

Sat 4/4

7:00 am-2:30 pm

2 stops26h 30m

Faro

Wed 4/22

3:25 pm-8:46 pm

2 stops58h 21m

$849

KnoxvilleFaro

TYS - FAO

TYSFAO

Knoxville McGhee Tyson

Wed 4/1

12:00 pm-7:30 pm

2 stops26h 30m

Faro

Sun 4/5

10:30 am-9:32 pm

2 stops40h 02m

$914

Flights are sorted by cheapest round-trip flights first.

Deals found on 11/11

Showing 1-10 of 23 results
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Best time to book a flight from Knoxville to Portugal

Have a flexible travel schedule? Discover the best time to fly to Portugal 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 Portugal

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

Currently, October is the cheapest month in which you can book a flight from Knoxville to Portugal (average of $520). Flying from Knoxville to Portugal in June is currently the most expensive (average of $1,119). 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 PT?

Find hourly flight availability from Knoxville to Portugal. Discover flight options and departure times throughout the day, allowing you to choose a departure time that suits your schedule. Data last updated November 13, 2025.

It’s optimal to fly from Knoxville to Portugal in the afternoon. By choosing this option you can save up to 27% on the cost of your flight, compared to a flight in the evening.

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

Use this chart to determine the cheapest time to fly round-trip from Knoxville to Portugal. Price data was last updated on December 16, 2024.

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

Reviews of airlines servicing Portugal

Get insights into the airlines that provide service to Portugal. 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 Portugal. Reviews last updated November 13, 2025.
Peruse reviews from past customers who have flown with United Airlines, American Airlines, and British Airways from Knoxville to Portugal 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
9,015 reviews

Crew

8.1

Overall

7.4

Entertainment

7.1

Boarding

7.7

Comfort

7.3

Food

6.6

Reviews

1 / 20
2.0
Mediocre

Sebrena,Oct 2025

IAH - RSW

The worst that I have ever experienced in my life so bad if it was free I'm not ever going to use your Airline again I dont believe ..... very disappointed 😞 😔0000000000000
United Airlines
7.4
Good
9,015 reviews
United Airlines
7.4
Good
9,015 reviews

Crew

8.1

Overall

7.4

Entertainment

7.1

Boarding

7.7

Comfort

7.3

Food

6.6

Reviews

1 / 20
2.0
Mediocre

Sebrena,Oct 2025

IAH - RSW

The worst that I have ever experienced in my life so bad if it was free I'm not ever going to use your Airline again I dont believe ..... very disappointed 😞 😔0000000000000
American Airlines
7.2
Good
11,050 reviews
United Airlines
7.4
Good
9,015 reviews

Crew

8.1

Overall

7.4

Entertainment

7.1

Boarding

7.7

Comfort

7.3

Food

6.6

Reviews

1 / 20
2.0
Mediocre

Sebrena,Oct 2025

IAH - RSW

The worst that I have ever experienced in my life so bad if it was free I'm not ever going to use your Airline again I dont believe ..... very disappointed 😞 😔0000000000000
British Airways
6.7
Okay
7,516 reviews
United Airlines
7.4
Good
9,015 reviews

Crew

8.1

Overall

7.4

Entertainment

7.1

Boarding

7.7

Comfort

7.3

Food

6.6

Reviews

1 / 20
2.0
Mediocre

Sebrena,Oct 2025

IAH - RSW

The worst that I have ever experienced in my life so bad if it was free I'm not ever going to use your Airline again I dont believe ..... very disappointed 😞 😔0000000000000

Related info for your journey

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

  • What airport do you fly from for flights from Knoxville to Portugal?

    For a flight from Knoxville to Portugal, you will be flying from McGhee Tyson. Knoxville McGhee Tyson (TYS) is just 11.3 mi from the center of the city.

  • How long is the flight from Knoxville to Portugal?

    For as low as $966, United Airlines can have you in Portugal from Knoxville in 17h 23m. The distance from Knoxville to Portugal is about 4103 mi. When browsing for deals, the options you’ll see will be for both nonstop flights and flights with stops.

  • What are the most popular routes from Knoxville to Portugal?

    The most popular flight routes from Knoxville to Portugal are Knoxville McGhee Tyson - Faro, Knoxville McGhee Tyson - Lisbon Humberto Delgado and Knoxville McGhee Tyson - Funchal Madeira.

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

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

  • How can I find direct flights from Knoxville to Portugal?

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

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

    Yes. Cheapflights offers flight deals from Knoxville to Portugal 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 Portugal?

    Currently, October is the cheapest month in which you can book a flight from Knoxville to Portugal (average of $520). Flying from Knoxville to Portugal in June is currently the most expensive (average of $1,119). 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 3 airlines flying from Knoxville to Portugal

Discover the top 3 airlines that operate flights from Knoxville to Portugal. 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 November 13, 2025.
AirlineCheapestAverageFlexibilityOn-time
American AirlinesCheapest$565Average$993FlexibilityNo cancel feeOn-time71%
British AirwaysCheapest$615Average$967FlexibilityNo cancel feeOn-time70%
United AirlinesCheapest$619Average$1,002FlexibilityNo cancel feeOn-time69%

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