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$73+ Cheap flights from Key Largo, FL to San Antonio (SAT)

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 9/26. Fares are subject to change and may not be available on all flights or dates of travel.
MIA — SAT
Aug 19 — Aug 261
Tue 8/19
Tue 8/26
1 adult, Economy
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Cheapflights Tip: The best prices from Key Largo to San Antonio are usually found in September or August, booked 53 days in advance, depart on a Thursday or Wednesday and return on a Friday

Cheap flight deals from Key Largo to San Antonio

Keep the following information in mind while searching for Key Largo to San Antonio flight deals. Data was last updated August 14, 2025.

Round-trip from

$159
(American Airlines)

One-way from

$73
(Priceline)

Popular in

April

Cheapest in

September

Average price

$262
From Key Largo to San Antonio
Search Deals
One-way flight from Key Largo to San Antonio
Search Deals
Highest demand for flights based on searches. 9% potential increase in price ($37 potential increase over avg. RT price).
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Cheapest flight prices on average. 2% potential price decrease ($10 potential savings vs. average RT price).
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Average for round-trip flights in August 2025
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Find flight deals from Key Largo to San Antonio

Cheapest flights from Key Largo to San Antonio
Explore the most affordable flight options available from Key Largo to San Antonio. Find the lowest fares from popular airlines and budget airlines, with prices last updated on August 14, 2025.

This American Airlines deal was found by Cheapflights users on 8/14. 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 American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 9/259:44 pmMIA - SAT
Nonstop3h 11mAmerican Airlines
Tue 9/305:29 amSAT - MIA
Nonstop2h 51mAmerican Airlines
Deal found 8/14$159
This American Airlines deal was found by Cheapflights users on 8/13. 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 American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 10/237:42 pmMIA - SAT
Nonstop3h 16mAmerican Airlines
Tue 11/45:25 amSAT - MIA
Nonstop2h 46mAmerican Airlines
Deal found 8/13$160
This American Airlines deal was found by Cheapflights users on 8/13. 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 American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 10/29:44 pmMIA - SAT
Nonstop3h 11mAmerican Airlines
Mon 10/65:30 amSAT - MIA
Nonstop2h 45mAmerican Airlines
Deal found 8/13$161
This Frontier deal was found by Cheapflights users on 8/14. 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 Frontier is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 9/126:00 amMIA - SAT
1 stop14h 15mFrontier
Thu 10/211:33 amSAT - MIA
1 stop11h 39mFrontier
Deal found 8/14$163
This Frontier deal was found by Cheapflights users on 8/14. 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 Frontier is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 9/46:59 pmMIA - SAT
1 stop22h 31mFrontier
Sun 9/79:55 amSAT - MIA
1 stop13h 49mFrontier
Deal found 8/14$165
This FlightHub deal was found by Cheapflights users on 8/14. 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 FlightHub is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 9/176:25 pmMIA - SAT
1 stop17h 23mFrontier
Sun 9/219:55 amSAT - MIA
1 stop13h 49mFrontier
Deal found 8/14$170
This American Airlines deal was found by Cheapflights users on 8/14. 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 American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 9/59:44 pmMIA - SAT
Nonstop3h 11mAmerican Airlines
Tue 9/95:29 amSAT - MIA
Nonstop2h 51mAmerican Airlines
Deal found 8/14$174
This Southwest deal was found by Cheapflights users on 8/12. 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 Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 9/126:15 pmMIA - SAT
1 stop4h 40mSouthwest
Sun 9/145:00 amSAT - MIA
1 stop6h 00mSouthwest
Deal found 8/12$181
This Priceline deal was found by Cheapflights users on 8/14. 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 Priceline is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 10/69:28 amMIA - SAT
1 stop8h 02mFrontier
Fri 10/105:45 pmSAT - MIA
1 stop5h 49mFrontier
Deal found 8/14$182
This Southwest deal was found by Cheapflights users on 8/14. 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 Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 9/266:05 amMIA - SAT
1 stop9h 45mSouthwest
Mon 9/295:35 amSAT - MIA
2 stops8h 40mSouthwest
Deal found 8/14$186
This Southwest deal was found by Cheapflights users on 8/14. 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 Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 10/46:50 amMIA - SAT
2 stops13h 30mSouthwest
Mon 10/610:30 amSAT - MIA
1 stop7h 20mSouthwest
Deal found 8/14$189

Cheapflights Fare Finder

 
Customize your flight search to find flights from Key Largo to San Antonio 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 August 14, 2025.
Use the filters below to find and compare flights from Key Largo to San Antonio that are best for you.

Fly from

Key Largo

Fly to

San Antonio

Route

Depart

Return

Price

MiamiSan Antonio

MIA - SAT

MIASAT

Miami

Thu 9/25

9:44 pm-11:55 pm

Nonstop3h 11m

San Antonio

Tue 9/30

5:29 am-9:20 am

Nonstop2h 51m

$159

MiamiSan Antonio

MIA - SAT

MIASAT

Miami

Thu 10/23

7:42 pm-9:58 pm

Nonstop3h 16m

San Antonio

Tue 11/4

5:25 am-9:11 am

Nonstop2h 46m

$160

MiamiSan Antonio

MIA - SAT

MIASAT

Miami

Sat 10/4

9:44 pm-11:55 pm

Nonstop3h 11m

San Antonio

Mon 10/6

6:12 pm-9:58 pm

Nonstop2h 46m

$161

MiamiSan Antonio

MIA - SAT

MIASAT

Miami

Thu 10/2

9:44 pm-11:55 pm

Nonstop3h 11m

San Antonio

Mon 10/6

5:30 am-9:15 am

Nonstop2h 45m

$161

MiamiSan Antonio

MIA - SAT

MIASAT

Miami

Fri 10/3

6:00 am-6:30 pm

1 stop13h 30m

San Antonio

Mon 10/6

5:40 pm-12:12 am

1 stop5h 32m

$163

MiamiSan Antonio

MIA - SAT

MIASAT

Miami

Fri 9/26

5:30 am-4:30 pm

1 stop12h 00m

San Antonio

Mon 9/29

5:40 pm-12:12 am

1 stop5h 32m

$163

MiamiSan Antonio

MIA - SAT

MIASAT

Miami

Fri 9/12

6:00 am-7:15 pm

1 stop14h 15m

San Antonio

Thu 10/2

11:33 am-12:12 am

1 stop11h 39m

$163

MiamiSan Antonio

MIA - SAT

MIASAT

Miami

Mon 10/20

5:15 am-4:50 pm

1 stop12h 35m

San Antonio

Thu 10/23

8:26 pm-6:19 am

1 stop8h 53m

$163

MiamiSan Antonio

MIA - SAT

MIASAT

Miami

Sat 10/4

6:45 am-9:10 am

1 stop27h 25m

San Antonio

Mon 10/6

5:40 pm-12:12 am

1 stop5h 32m

$165

MiamiSan Antonio

MIA - SAT

MIASAT

Miami

Thu 9/4

6:59 pm-4:30 pm

1 stop22h 31m

San Antonio

Sun 9/7

9:55 am-12:44 am

1 stop13h 49m

$165

Flights are sorted by cheapest round-trip flights first.

Deals found on 8/14

Showing 1-10 of 21 results
1
2
3

Best time to book a flight from Key Largo to San Antonio

Have a flexible travel schedule? Discover the best time to fly to San Antonio from Key Largo 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 Key Largo to San Antonio

How far ahead should I book a flight from Key Largo to San Antonio?

Use this chart to determine the optimal time to book a round-trip flight from Key Largo to San Antonio. Price data was last updated on August 8, 2025.

Booking 53 days in advance of your planned departure date is, on average, the best time to get cheap flights from Key Largo to San Antonio. The general trend is that the closer you book to the departure date, the more expensive your flight will be.

What is the cheapest month to book a flight from Key Largo to San Antonio?

Currently, August is the cheapest month in which you can book a flight from Key Largo to San Antonio (average of $295). Flying from Key Largo to San Antonio in March is currently the most expensive (average of $376). 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 KE9 to SAT?

Find hourly flight availability from Key Largo to San Antonio. Discover flight options and departure times throughout the day, allowing you to choose a departure time that suits your schedule. Data last updated August 14, 2025.

When flying from Key Largo to San Antonio, the time of day you decide to fly out makes little to no difference towards the overall price you’ll pay on tickets.

What is the cheapest day to fly from Key Largo to San Antonio?

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

Travelers seeking maximum savings on their Key Largo to San Antonio flight should consider departing on Friday afternoons when fares are most often at their lowest. Sunday at noon flights should be avoided if possible as fares are typically the most expensive at this time.

Weekly flight availability from Key Largo to San Antonio

Explore weekly flight availability from Key Largo to San Antonio. Discover flights operating on different days of the week, giving you the flexibility to choose a travel day that best fits your plans. Compare info to find the most convenient option for your journey. Data last updated August 14, 2025.

The most flights from KE9 to SAT are scheduled on a Monday (2 on average). You will have fewer flight options on Monday, which is when the least amount of flights are scheduled (2 on average).

Reviews of airlines servicing San Antonio

Get insights into the airlines that provide service to San Antonio. 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 San Antonio. Reviews last updated August 14, 2025.
Read reviews from past customers who have flown Southwest, Delta, and United Airlines from Key Largo to San Antonio. Users can see the overall rating for each airline as well as how each is rated in terms of entertainment options, comfort, food, crew/service, and boarding process.
Southwest
8.0
Very good
4,244 reviews

Overall

8.0

Entertainment

7.5

Comfort

8.0

Boarding

8.1

Crew

8.6

Food

7.0

Reviews

1 / 20
8.0
Excellent

Ila,Mar 2025

HOU - DAL

Our original flight was delayed. We were able to change our flight and got home at close to the same time. Looking forward to when you have assigned seating.
Southwest
8.0
Very good
4,244 reviews
Southwest
8.0
Very good
4,244 reviews

Overall

8.0

Entertainment

7.5

Comfort

8.0

Boarding

8.1

Crew

8.6

Food

7.0

Reviews

1 / 20
8.0
Excellent

Ila,Mar 2025

HOU - DAL

Our original flight was delayed. We were able to change our flight and got home at close to the same time. Looking forward to when you have assigned seating.
Delta
8.0
Very good
7,980 reviews
Southwest
8.0
Very good
4,244 reviews

Overall

8.0

Entertainment

7.5

Comfort

8.0

Boarding

8.1

Crew

8.6

Food

7.0

Reviews

1 / 20
8.0
Excellent

Ila,Mar 2025

HOU - DAL

Our original flight was delayed. We were able to change our flight and got home at close to the same time. Looking forward to when you have assigned seating.
United Airlines
7.4
Good
8,916 reviews
Southwest
8.0
Very good
4,244 reviews

Overall

8.0

Entertainment

7.5

Comfort

8.0

Boarding

8.1

Crew

8.6

Food

7.0

Reviews

1 / 20
8.0
Excellent

Ila,Mar 2025

HOU - DAL

Our original flight was delayed. We were able to change our flight and got home at close to the same time. Looking forward to when you have assigned seating.
American Airlines
7.2
Good
10,000 reviews
Southwest
8.0
Very good
4,244 reviews

Overall

8.0

Entertainment

7.5

Comfort

8.0

Boarding

8.1

Crew

8.6

Food

7.0

Reviews

1 / 20
8.0
Excellent

Ila,Mar 2025

HOU - DAL

Our original flight was delayed. We were able to change our flight and got home at close to the same time. Looking forward to when you have assigned seating.
Spirit Airlines
6.3
Okay
8,046 reviews
Southwest
8.0
Very good
4,244 reviews

Overall

8.0

Entertainment

7.5

Comfort

8.0

Boarding

8.1

Crew

8.6

Food

7.0

Reviews

1 / 20
8.0
Excellent

Ila,Mar 2025

HOU - DAL

Our original flight was delayed. We were able to change our flight and got home at close to the same time. Looking forward to when you have assigned seating.

Related info for your journey

Find useful and relevant information for your journey from Key Largo to San Antonio. 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 into for flights to San Antonio from Key Largo?

    San Antonio (SAT), located 7.6 mi from the city center, is the airport you fly into when you book flights from Key Largo to San Antonio. 5 airlines have flights to San Antonio from Key Largo on a regular basis. Booking flights from Key Largo to San Antonio should not be difficult; the airport handles an average of 2 inbound flights from Key Largo per day.

  • How popular is this Key Largo to San Antonio flight route?

    Within the past month, 2 users have taken a look at flights from Key Largo to San Antonio.

  • What are the most reliable airlines from Key Largo to San Antonio?

    The top 3 most reliable airlines when flying from Key Largo to San Antonio are Envoy Air (71%), American Airlines (62%) and Qatar Airways (57%).

  • What are the cheapest flights from Key Largo to San Antonio?

    While on average a flight from Key Largo to San Antonio is generally $342, our data shows the cheapest flight currently is $98. When looking at the most popular route, (Miami - San Antonio), you can expect to pay $211 for that flight.

  • Can I find deals for flights from Key Largo to San Antonio that include hotel bookings?

    Yes. In addition to deals on Key Largo to San Antonio flights, Cheapflights offers vacation packages that include both flights and hotel.

  • How can I find direct flights from Key Largo to San Antonio?

    After entering your origin and destination, apply the non-stop filter on the search result page to find direct flights from Key Largo to San Antonio.

  • Can I find deals for business class flights from Key Largo to San Antonio?

    Yes. Cheapflights offers flight deals from Key Largo to San Antonio 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 Key Largo to San Antonio?

    Currently, August is the cheapest month in which you can book a flight from Key Largo to San Antonio (average of $295). Flying from Key Largo to San Antonio in March is currently the most expensive (average of $376). 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 San Antonio?

Book flights to San Antonio if you plan to visit one of these locations
New Braunfels
Kerrville

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Top 5 airlines flying from Key Largo to San Antonio

Discover the top 5 airlines that operate flights from Key Largo to San Antonio. 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 August 14, 2025.
AirlineCheapestAverageFlexibilityOn-time
Spirit AirlinesCheapest$106Average$191FlexibilityNo cancel feeOn-time65%
American AirlinesCheapest$169Average$385FlexibilityNo cancel feeOn-time71%
DeltaCheapest$216Average$348FlexibilityNo cancel feeOn-timeN/A
SouthwestCheapest$248Average$433FlexibilityNo cancel feeOn-time63%
United AirlinesCheapest$267Average$436FlexibilityNo cancel feeOn-time69%

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