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Portugal

$393+ 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 5/30. Fares are subject to change and may not be available on all flights or dates of travel.
TYS — LIS
Mar 20 — Mar 271
Fri 3/20
Fri 3/27
1 adult, Economy
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Cheap 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 February 18, 2026.

This oojo deal was found by Cheapflights users on 2/17. 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 oojo is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 11/67:38 am
TYS
-
LIS
2 stops23h 27m
British Airways
Fri 11/1311:05 am
LIS
-
TYS
1 stop14h 59m
British Airways
Deal found 2/17$496
This United Airlines deal was found by Cheapflights users on 2/15. 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 5/48:30 pm
TYS
-
LIS
2 stops33h 30m
United Airlines
Sun 5/107:25 am
LIS
-
TYS
2 stops31h 41m
United Airlines
Deal found 2/15$505
This United Airlines deal was found by Cheapflights users on 2/17. 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 4/57:20 pm
TYS
-
LIS
1 stop10h 10m
United Airlines
Sat 4/187:25 am
LIS
-
TYS
2 stops20h 04m
United Airlines
Deal found 2/17$540
This United Airlines deal was found by Cheapflights users on 2/15. 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 4/57:20 pm
TYS
-
LIS
1 stop10h 10m
United Airlines
Tue 4/2112:20 pm
LIS
-
TYS
1 stop27h 30m
United Airlines
Deal found 2/15$543
This oojo deal was found by Cheapflights users on 2/15. 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 oojo is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 4/295:06 pm
TYS
-
LIS
2 stops17h 34m
British Airways
Sat 5/97:10 am
LIS
-
TYS
2 stops18h 08m
British Airways
Deal found 2/15$559
This Finnair deal was found by Cheapflights users on 2/15. 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 Finnair is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 5/41:20 pm
TYS
-
LIS
2 stops28h 50m
Multiple Airlines
Wed 5/206:35 am
LIS
-
TYS
2 stops22h 21m
Multiple Airlines
Deal found 2/15$598
This oojo deal was found by Cheapflights users on 2/17. 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 oojo is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 9/198:39 pm
TYS
-
LIS
2 stops45h 26m
British Airways
Wed 9/307:20 am
LIS
-
TYS
2 stops19h 34m
British Airways
Deal found 2/17$602
This United Airlines deal was found by Cheapflights users on 2/15. 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 2/227:05 am
TYS
-
LIS
2 stops22h 10m
United Airlines
Sun 3/15:00 am
LIS
-
TYS
2 stops39h 15m
United Airlines
Deal found 2/15$605
This United Airlines deal was found by Cheapflights users on 2/16. 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.
Wed 2/259:40 am
TYS
-
LIS
1 stop19h 35m
United Airlines
Sun 3/111:55 am
LIS
-
TYS
1 stop12h 34m
United Airlines
Deal found 2/16$607
This United Airlines deal was found by Cheapflights users on 2/17. 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.
Wed 2/256:45 am
TYS
-
FAO
2 stops23h 55m
United Airlines
Sun 3/11:30 pm
FAO
-
TYS
2 stops34h 59m
United Airlines
Deal found 2/17$828
This oojo deal was found by Cheapflights users on 2/16. 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 oojo is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 4/37:40 am
TYS
-
FAO
2 stops30h 30m
Aer Lingus
Fri 4/1011:45 am
FAO
-
TYS
2 stops38h 36m
Aer Lingus
Deal found 2/16$1,148
This United Airlines deal was found by Cheapflights users on 2/14. 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.
Thu 2/267:25 pm
TYS
-
FAO
2 stops34h 00m
United Airlines
Mon 3/26:05 am
FAO
-
TYS
2 stops18h 24m
United Airlines
Deal found 2/14$1,886

Find flight deals from Knoxville to Portugal

Keep the following information in mind while searching for Knoxville to Portugal flight deals. Data was last updated February 18, 2026.

Most accurate provider

FlightHub
3 stars

Most trusted provider

FlightHub
3 stars

Round-trip from

$505
(United Airlines)

One-way from

$393
(Kiwi.com)

Popular in

June

Cheapest in

January

Average price

$747
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 Portugal
Search Deals
One-way flight from Knoxville McGhee Tyson to Portugal
Search Deals
Highest demand for flights based on searches. 31% potential increase in price ($457 potential increase over avg. RT price).
Search Deals
Cheapest flight prices on average. 8% potential price decrease ($79 potential savings vs. average RT price).
Search Deals
Average for round-trip flights in February 2026
Search Deals

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 February 18, 2026.
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

Mon 5/4

8:30 pm-11:00 am

2 stops33h 30m

Lisbon Humberto Delgado

Sun 5/10

7:25 am-10:06 am

2 stops31h 41m

$505

KnoxvilleLisbon

TYS - LIS

TYSLIS

Knoxville McGhee Tyson

Sun 4/5

9:40 am-10:30 am

1 stop19h 50m

Lisbon Humberto Delgado

Sat 4/18

5:05 am-10:29 pm

2 stops22h 24m

$540

KnoxvilleLisbon

TYS - LIS

TYSLIS

Knoxville McGhee Tyson

Sun 4/5

7:20 pm-10:30 am

1 stop10h 10m

Lisbon Humberto Delgado

Tue 4/21

10:25 am-10:29 pm

2 stops17h 04m

$543

KnoxvilleLisbon

TYS - LIS

TYSLIS

Knoxville McGhee Tyson

Wed 4/29

5:06 pm-3:40 pm

2 stops17h 34m

Lisbon Humberto Delgado

Sat 5/9

7:10 am-8:18 pm

2 stops18h 08m

$559

KnoxvilleLisbon

TYS - LIS

TYSLIS

Knoxville McGhee Tyson

Mon 5/4

1:20 pm-11:10 pm

2 stops28h 50m

Lisbon Humberto Delgado

Wed 5/20

6:35 am-11:56 pm

2 stops22h 21m

$598

KnoxvilleLisbon

TYS - LIS

TYSLIS

Knoxville McGhee Tyson

Tue 3/31

7:40 am-10:55 am

2 stops22h 15m

Lisbon Humberto Delgado

Tue 4/7

5:35 am-11:57 pm

2 stops23h 22m

$654

KnoxvilleLisbon

TYS - LIS

TYSLIS

Knoxville McGhee Tyson

Sun 4/5

5:40 am-11:25 pm

2 stops36h 45m

Lisbon Humberto Delgado

Tue 4/21

6:35 am-11:56 pm

2 stops22h 21m

$656

KnoxvilleLisbon

TYS - LIS

TYSLIS

Knoxville McGhee Tyson

Tue 3/31

4:02 pm-5:55 pm

2 stops20h 53m

Lisbon Humberto Delgado

Tue 4/7

11:05 am-9:57 pm

1 stop15h 52m

$675

KnoxvilleFaro

TYS - FAO

TYSFAO

Knoxville McGhee Tyson

Fri 4/3

7:40 am-7:10 pm

2 stops30h 30m

Faro

Fri 4/10

11:45 am-9:21 pm

2 stops38h 36m

$1,148

KnoxvilleLisbon

TYS - LIS

TYSLIS

Knoxville McGhee Tyson

Sat 5/30

7:10 am-9:45 pm

3 stops57h 35m

$393

Flights are sorted by cheapest round-trip flights first.

Deals found on 2/16

Showing 1-10 of 17 results
1
2

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, December is the cheapest month in which you can book a flight from Knoxville to Portugal (average of $475). Flying from Knoxville to Portugal in May is currently the most expensive (average of $1,121). 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 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 February 18, 2026.
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
9,312 reviews

Comfort

7.3

Entertainment

7.1

Boarding

7.7

Crew

8.1

Food

6.6

Overall

7.4

Reviews

1 / 20
10.0
Excellent

Dane,Jan 2026

TYS - IAD

It was a short flight, so no time for amenities. Just glad everything was quick and easy from boarding to arriving at my destination with my family
United Airlines
7.4
Good
9,312 reviews
United Airlines
7.4
Good
9,312 reviews

Comfort

7.3

Entertainment

7.1

Boarding

7.7

Crew

8.1

Food

6.6

Overall

7.4

Reviews

1 / 20
10.0
Excellent

Dane,Jan 2026

TYS - IAD

It was a short flight, so no time for amenities. Just glad everything was quick and easy from boarding to arriving at my destination with my family
American Airlines
7.2
Good
11,304 reviews
United Airlines
7.4
Good
9,312 reviews

Comfort

7.3

Entertainment

7.1

Boarding

7.7

Crew

8.1

Food

6.6

Overall

7.4

Reviews

1 / 20
10.0
Excellent

Dane,Jan 2026

TYS - IAD

It was a short flight, so no time for amenities. Just glad everything was quick and easy from boarding to arriving at my destination with my family
British Airways
6.7
Okay
7,751 reviews
United Airlines
7.4
Good
9,312 reviews

Comfort

7.3

Entertainment

7.1

Boarding

7.7

Crew

8.1

Food

6.6

Overall

7.4

Reviews

1 / 20
10.0
Excellent

Dane,Jan 2026

TYS - IAD

It was a short flight, so no time for amenities. Just glad everything was quick and easy from boarding to arriving at my destination with my family

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 $1,148, United Airlines can have you in Portugal from Knoxville in 30h 30m. 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 - Lisbon Humberto Delgado, Knoxville McGhee Tyson - Faro 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, December is the cheapest month in which you can book a flight from Knoxville to Portugal (average of $475). Flying from Knoxville to Portugal in May is currently the most expensive (average of $1,121). 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 February 18, 2026.
AirlineCheapestAverageFlexibilityOn-time
British AirwaysCheapest$475Average$885FlexibilityNo cancel feeOn-time70%
American AirlinesCheapest$509Average$1,113FlexibilityNo cancel feeOn-time71%
United AirlinesCheapest$633Average$1,086FlexibilityNo cancel feeOn-time69%

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