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Cheap flights from Knoxville to Puerto Rico from $138

This is the cheapest one-way flight price found by a momondo user in the last 72 hours by searching for a flight from Knoxville to Puerto Rico departing on 9/20. Fares may change, and may not be available for all flights or travel dates. Click the price to refresh the search for this deal.
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0 bags

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Find the cheapest flights from Knoxville to Puerto Rico

Cheap round-trip flights

Logo
4:31 pm - 11:04 amTYS-SJU
18h 33m1 stop
Logo
3:39 am - 11:08 pmSJU-TYS
43h 29m2 stops
$309
Find Deal
Sat, Sep 20 - Fri, Sep 26
Logo
4:31 pm - 11:04 amTYS-SJU
18h 33m1 stop
Logo
3:19 pm - 11:08 pmSJU-TYS
31h 49m2 stops
$360
Find Deal
Sat, Sep 20 - Sat, Sep 27
Logo
7:10 am - 2:02 amTYS-SJU
18h 52m1 stop
Logo
7:58 pm - 2:32 pmSJU-TYS
42h 34m2 stops
$365
Find Deal
Sat, Oct 11 - Sat, Oct 18
Logo
7:10 am - 2:02 amTYS-SJU
18h 52m1 stop
Logo
1:59 am - 1:33 pmSJU-TYS
35h 34m2 stops
$393
Find Deal
Sat, Oct 11 - Fri, Oct 17
Delta Logo
3:59 pm - 10:59 pmTYS-SJU
6h 00m1 stop
Delta Logo
6:36 pm - 11:52 pmSJU-TYS
6h 16m1 stop
$400Delta
Find Deal
Mon, Nov 3 - Mon, Nov 10
American Airlines Logo
6:10 am - 12:50 pmTYS-SJU
6h 40m1 stop
American Airlines Logo
4:43 pm - 8:37 amSJU-TYS
15h 54m1 stop
$425American Airlines
Find Deal
Fri, Sep 26 - Wed, Oct 1
Delta Logo
12:01 pm - 10:00 pmTYS-SJU
9h 59m1 stop
Delta Logo
5:41 pm - 11:44 pmSJU-TYS
6h 03m1 stop
$443Delta
Find Deal
Fri, Sep 26 - Wed, Oct 1
American Airlines Logo
12:15 pm - 11:37 pmTYS-SJU
11h 22m2 stops
American Airlines Logo
12:01 pm - 11:50 pmSJU-TYS
11h 49m1 stop
$445American Airlines
Find Deal
Fri, Sep 26 - Wed, Oct 1
United Airlines Logo
7:00 am - 2:44 pmTYS-SJU
7h 44m1 stop
United Airlines Logo
2:55 pm - 11:43 pmSJU-TYS
8h 48m1 stop
$495United Airlines
Find Deal
Sat, Sep 20 - Sat, Sep 27
United Airlines Logo
10:54 am - 11:57 pmTYS-SJU
13h 03m2 stops
United Airlines Logo
1:05 am - 1:25 pmSJU-TYS
12h 20m2 stops
$555United Airlines
Find Deal
Sat, Sep 20 - Fri, Sep 26

Delta flights from Knoxville to Puerto Rico

Our best Delta deals on Knoxville to Puerto Rico flight tickets
Delta
Nov 3
TYS3:59 pmKnoxville McGhee Tyson
6h 00m
1 stop
SJU10:59 pmSan Juan Luis Munoz Marin Intl
Nov 10
SJU6:36 pmSan Juan Luis Munoz Marin Intl
6h 16m
1 stop
TYS11:52 pmKnoxville McGhee Tyson
$400
Find similar
Delta
Sep 26
TYS12:01 pmKnoxville McGhee Tyson
9h 59m
1 stop
SJU10:00 pmSan Juan Luis Munoz Marin Intl
Oct 1
SJU5:41 pmSan Juan Luis Munoz Marin Intl
6h 03m
1 stop
TYS11:44 pmKnoxville McGhee Tyson
$443
Find similar
Delta
Sep 13
TYS5:45 amKnoxville McGhee Tyson
7h 31m
1 stop
SJU1:16 pmSan Juan Luis Munoz Marin Intl
Sep 16
SJU2:26 pmSan Juan Luis Munoz Marin Intl
9h 18m
1 stop
TYS11:44 pmKnoxville McGhee Tyson
$930
Find similar

United Airlines flights from Knoxville to Puerto Rico

Our best United Airlines deals on Knoxville to Puerto Rico flight tickets
United Airlines
Sep 20
TYS7:00 amKnoxville McGhee Tyson
7h 44m
1 stop
SJU2:44 pmSan Juan Luis Munoz Marin Intl
Sep 27
SJU2:55 pmSan Juan Luis Munoz Marin Intl
8h 48m
1 stop
TYS11:43 pmKnoxville McGhee Tyson
$495
Find similar
United Airlines
Sep 20
TYS10:54 amKnoxville McGhee Tyson
13h 03m
2 stops
SJU11:57 pmSan Juan Luis Munoz Marin Intl
Sep 26
SJU1:05 amSan Juan Luis Munoz Marin Intl
12h 20m
2 stops
TYS1:25 pmKnoxville McGhee Tyson
$555
Find similar
United Airlines
Oct 11
TYS10:51 amKnoxville McGhee Tyson
13h 06m
2 stops
SJU11:57 pmSan Juan Luis Munoz Marin Intl
Oct 17
SJU1:05 amSan Juan Luis Munoz Marin Intl
12h 20m
2 stops
TYS1:25 pmKnoxville McGhee Tyson
$611
Find similar

momondo Fare Finder

 
Customize your flight search to find flights from Knoxville to Puerto Rico 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, momondo users made 832,500 searches. Data last updated September 4, 2025.
Use the filters below to find and compare flights from Knoxville to Puerto Rico that are best for you.

Fly from

Fly to

Route

Depart

Return

Price

KnoxvilleSan Juan

TYS - SJU

TYSSJU

Knoxville McGhee Tyson

Sat 9/20

4:31 pm-11:04 am

1 stop18h 33m

San Juan Luis Munoz Marin Intl

Fri 9/26

3:39 am-11:08 pm

2 stops43h 29m

$309

KnoxvilleSan Juan

TYS - SJU

TYSSJU

Knoxville McGhee Tyson

Sat 9/20

4:31 pm-11:04 am

1 stop18h 33m

San Juan Luis Munoz Marin Intl

Sat 9/27

3:19 pm-11:08 pm

2 stops31h 49m

$360

KnoxvilleSan Juan

TYS - SJU

TYSSJU

Knoxville McGhee Tyson

Sat 10/11

7:10 am-2:02 am

1 stop18h 52m

San Juan Luis Munoz Marin Intl

Sat 10/18

7:58 pm-2:32 pm

2 stops42h 34m

$365

KnoxvilleSan Juan

TYS - SJU

TYSSJU

Knoxville McGhee Tyson

Sat 10/11

7:10 am-2:02 am

1 stop18h 52m

San Juan Luis Munoz Marin Intl

Fri 10/17

1:59 am-1:33 pm

2 stops35h 34m

$393

KnoxvilleSan Juan

TYS - SJU

TYSSJU

Knoxville McGhee Tyson

Mon 11/3

3:59 pm-10:59 pm

1 stop6h 00m

San Juan Luis Munoz Marin Intl

Mon 11/10

6:36 pm-11:52 pm

1 stop6h 16m

$400

KnoxvilleSan Juan

TYS - SJU

TYSSJU

Knoxville McGhee Tyson

Fri 9/26

6:10 am-12:50 pm

1 stop6h 40m

San Juan Luis Munoz Marin Intl

Wed 10/1

4:43 pm-8:37 am

1 stop15h 54m

$425

KnoxvilleSan Juan

TYS - SJU

TYSSJU

Knoxville McGhee Tyson

Fri 9/26

12:01 pm-10:00 pm

1 stop9h 59m

San Juan Luis Munoz Marin Intl

Wed 10/1

5:41 pm-11:44 pm

1 stop6h 03m

$443

KnoxvilleSan Juan

TYS - SJU

TYSSJU

Knoxville McGhee Tyson

Fri 9/26

12:15 pm-11:37 pm

2 stops11h 22m

San Juan Luis Munoz Marin Intl

Wed 10/1

12:01 pm-11:50 pm

1 stop11h 49m

$445

KnoxvilleSan Juan

TYS - SJU

TYSSJU

Knoxville McGhee Tyson

Sat 9/20

7:00 am-2:44 pm

1 stop7h 44m

San Juan Luis Munoz Marin Intl

Sat 9/27

2:55 pm-11:43 pm

1 stop8h 48m

$495

KnoxvilleSan Juan

TYS - SJU

TYSSJU

Knoxville McGhee Tyson

Sat 9/20

10:54 am-11:57 pm

2 stops13h 03m

San Juan Luis Munoz Marin Intl

Fri 9/26

1:05 am-1:25 pm

2 stops12h 20m

$555

Flights are sorted by cheapest round-trip flights first.

Showing 1-10 of 20 resultsSorted by cheapest first
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See travel insights to Puerto Rico from

How to get the cheapest flight ticket from Knoxville to Puerto Rico

Look no further. We've gone through all the searches for this route on momondo so you have the important information and insights to find the cheapest flight ticket for your trip

What is the cheapest month to fly to Puerto Rico?

If you don’t want to visit Puerto Rico in February, then you should wait until September to fly from Knoxville, when ticket prices are also cheap, with an average price of $440.

What is the cheapest day to depart on your flight to Puerto Rico?

On average, the least expensive day to fly to Puerto Rico from Knoxville is on a Tuesday. momondo users have found tickets for Tuesday departures for as low as $445. However, this price may fluctuate depending on the airline, the season, and holidays. The most expensive day to fly to Puerto Rico is Friday, with ticket prices averaging around $579.

What is the cheapest time of day to depart on your flight to Puerto Rico?

Our most recent data shows that the best time of day to fly to Puerto Rico is in the evening. Flights from Knoxville to Puerto Rico during this time can be as low as $314. In contrast, the most expensive time of day to depart to Puerto Rico is at noon when prices are around $562.

How far in advance should I book a flight to Puerto Rico?

You are more likely to see cheaper flights to Puerto Rico from Knoxville when booking weeks ahead of your departure date. In general, you can expect to find flights to Puerto Rico for around $522 when searching weeks out. However, flight prices might be lower outside of this timeframe. For example, people recently found flights to Puerto Rico from Knoxville for as low as $384 on momondo.

Cheap Knoxville to Puerto Rico flight deals and tips

Find info about flight duration, direct flights, and airports for your flight from Knoxville to Puerto Rico

Direct flights

None
There are no direct flights from Knoxville to Puerto Rico. There are no popular flight routes from Knoxville to Puerto Rico.
Search flight deals

  • When did momondo last update prices for flights from Knoxville McGhee Tyson Airport to Puerto Rico?

    Prices for flights from Knoxville McGhee Tyson Airport to Puerto Rico were last updated today.

  • How many operators does momondo search for flights from Knoxville McGhee Tyson Airport to Puerto Rico?

  • How old do you have to be to fly from Knoxville McGhee Tyson Airport to Puerto Rico?

    The minimum age for a child to fly alone is five, but airlines that offer an unaccompanied minor (UNMR) service may have their own age limitations. Flight duration, scheduling, and layovers are among the considerations that may influence age limits. We recommend that you double-check with the airline you are booking with for travel from Knoxville McGhee Tyson Airport to Puerto Rico.

  • What documentation or ID do you need to fly to Puerto Rico?

    The travel and health documents required for your trip to Puerto Rico can vary based on your itinerary and personal situation. As a rule, consider having multiple documents such as a national ID card or driver’s license, and a passport valid for six-months after you plan to arrive at Puerto Rico. We always recommend checking with your airline or a trusted third party such as IATA to get advice.

Best airlines flying from Knoxville to Puerto Rico

Compare and see reviews for airlines that fly from Knoxville to Puerto Rico with momondo
Airline
Rating
Free Cancellation
Price
DeltaPriceFrom $334Free CancellationRating
7.9
7,977 reviews
Search Delta flights
United AirlinesPriceFrom $353Free CancellationRating
7.4
8,939 reviews
Search United Airlines flights
American AirlinesPriceFrom $373Free CancellationRating
7.2
10,000 reviews
Search American Airlines flights

Why use momondo?

Why should I use momondo to find a flight deal from Knoxville to Puerto Rico?

Finding the right flight to Puerto Rico from Knoxville is quick and easy when you have a range of options in front of you, from reputable agents and recognisable airlines. Options that can then be filtered down to find the best fit. That is what momondo does. We make finding flights to Puerto Rico quick and easy, saving you time and money.

Can I find flights from Knoxville to Puerto Rico with flexible booking policies on momondo?

Yes. momondo enables you to select and highlight flights to Puerto Rico from Knoxville with this policy.

How can momondo help me find flights from Knoxville to Puerto Rico?

momondo provides multiple filters to help you find the best flight to Puerto Rico from Knoxville. Filter by price, airline, airports, cabin, aircraft, payment method, number of stops and more.

I’m not ready to book a flight from Knoxville to Puerto Rico right now. Can momondo alert me if prices change?

Of course. momondo tracks the price of Knoxville to Puerto Rico flights. All you need is a valid email address and we will do the rest; it is that quick and easy.

An easier way to manage your Puerto Rico trip

We make it super easy to schedule, organize and travel with friends or family. Trips is free — and available to use no matter where you book.
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