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$53+ 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 12/30. Fares are subject to change and may not be available on all flights or dates of travel.
MIA — SAT
Nov 22 — Nov 291
Sat 11/22
Sat 11/29
1 adult, Economy
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Cheapflights Tip: The best prices from Key Largo to San Antonio are usually found in August or September, booked 48 days in advance, depart on a Thursday or Wednesday and return on a Friday

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 October 23, 2025.

This Frontier deal was found by Cheapflights users on 10/23. 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 Frontier is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 11/136:00 amMIA - SAT
1 stop14h 43mFrontier
Sat 11/153:12 pmSAT - MIA
1 stop14h 07mFrontier
Deal found 10/23$150
This American Airlines deal was found by Cheapflights users on 10/22. 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 American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 12/49:40 pmMIA - SAT
Nonstop3h 19mAmerican Airlines
Tue 12/95:20 amSAT - MIA
Nonstop2h 49mAmerican Airlines
Deal found 10/22$159
This Frontier deal was found by Cheapflights users on 10/23. 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 Frontier is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 11/145:01 amMIA - SAT
1 stop12h 39mFrontier
Sat 11/153:12 pmSAT - MIA
1 stop14h 07mFrontier
Deal found 10/23$163
This Kiwi.com deal was found by Cheapflights users on 10/23. 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 Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 11/118:08 pmMIA - SAT
2 stops23h 24mMultiple Airlines
Fri 11/145:35 pmSAT - MIA
1 stop15h 23mMultiple Airlines
Deal found 10/23$165
This Southwest deal was found by Cheapflights users on 10/22. 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 Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 12/49:30 amMIA - SAT
1 stop5h 05mSouthwest
Tue 12/93:05 pmSAT - MIA
1 stop5h 45mSouthwest
Deal found 10/22$166
This Orbitz deal was found by Cheapflights users on 10/22. 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 Orbitz is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 11/75:01 amMIA - SAT
1 stop12h 39mFrontier
Mon 11/105:35 pmSAT - MIA
1 stop5h 59mFrontier
Deal found 10/22$173
This Frontier deal was found by Cheapflights users on 10/22. 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 Frontier is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 10/315:05 amMIA - SAT
1 stop12h 35mFrontier
Mon 11/35:35 pmSAT - MIA
1 stop5h 59mFrontier
Deal found 10/22$176
This Frontier deal was found by Cheapflights users on 10/23. 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 Frontier is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 11/136:00 amMIA - SAT
1 stop14h 43mFrontier
Fri 11/148:25 pmSAT - MIA
1 stop8h 54mFrontier
Deal found 10/23$179
This Kiwi.com deal was found by Cheapflights users on 10/23. 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 Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 11/135:27 pmMIA - SAT
2 stops16h 47mMultiple Airlines
Fri 11/145:35 pmSAT - MIA
1 stop15h 23mMultiple Airlines
Deal found 10/23$191
This Frontier deal was found by Cheapflights users on 10/23. 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 Frontier is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 10/316:00 amMIA - SAT
1 stop14h 30mFrontier
Sun 11/28:26 pmSAT - MIA
1 stop8h 53mFrontier
Deal found 10/23$192
This Kiwi.com deal was found by Cheapflights users on 10/22. 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 Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 11/77:07 pmMIA - SAT
2 stops24h 25mMultiple Airlines
Mon 11/105:35 pmSAT - MIA
1 stop5h 59mMultiple Airlines
Deal found 10/22$199

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 October 23, 2025.

Most accurate provider

FlightHub
3 stars

Most trusted provider

FlightHub
3 stars

Round-trip from

$150
(Frontier)

One-way from

$53
(Trip.com)

Popular in

April

Cheapest in

August

Average price

$294
Provider with most accurate pricing for Miami-San Antonio flight deals.
Search Deals
Provider most trusted by Cheapflights users for Miami-San Antonio flights.
Search Deals
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. 8% potential increase in price ($32 potential increase over avg. RT price).
Search Deals
Cheapest flight prices on average. 2% potential price decrease ($9 potential savings vs. average RT price).
Search Deals
Average for round-trip flights in October 2025
Search Deals

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 October 23, 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 12/4

1:45 pm-9:50 pm

1 stop9h 05m

San Antonio

Mon 12/8

5:45 am-4:10 pm

1 stop9h 25m

$166

MiamiSan Antonio

MIA - SAT

MIASAT

Miami

Thu 11/13

9:40 pm-11:59 pm

Nonstop3h 19m

San Antonio

Sun 11/16

5:23 am-9:09 am

Nonstop2h 46m

$179

MiamiSan Antonio

MIA - SAT

MIASAT

Miami

Tue 1/13

12:00 pm-9:05 pm

1 stop10h 05m

San Antonio

Sun 1/18

2:10 pm-9:30 pm

1 stop6h 20m

$197

MiamiSan Antonio

MIA - SAT

MIASAT

Miami

Fri 11/7

9:40 pm-11:59 pm

Nonstop3h 19m

San Antonio

Wed 11/12

5:23 am-9:09 am

Nonstop2h 46m

$204

MiamiSan Antonio

MIA - SAT

MIASAT

Miami

Mon 11/10

6:25 am-6:32 pm

2 stops13h 07m

San Antonio

Fri 11/14

5:35 pm-9:58 am

1 stop15h 23m

$210

MiamiSan Antonio

MIA - SAT

MIASAT

Miami

Fri 11/7

7:07 pm-6:32 pm

2 stops24h 25m

San Antonio

Mon 11/10

5:35 pm-12:34 am

1 stop5h 59m

$214

MiamiSan Antonio

MIA - SAT

MIASAT

Miami

Thu 11/13

7:00 am-12:10 pm

1 stop6h 10m

San Antonio

Tue 11/18

11:35 am-6:25 pm

1 stop5h 50m

$217

MiamiSan Antonio

MIA - SAT

MIASAT

Miami

Fri 11/14

8:05 am-4:11 pm

1 stop9h 06m

San Antonio

Tue 11/18

5:15 am-1:02 pm

1 stop6h 47m

$217

MiamiSan Antonio

MIA - SAT

MIASAT

Miami

Wed 11/12

10:28 am-3:53 pm

1 stop6h 25m

San Antonio

Wed 11/19

6:30 am-1:02 pm

1 stop5h 32m

$233

MiamiSan Antonio

MIA - SAT

MIASAT

Miami

Wed 11/12

6:00 am-10:40 am

1 stop5h 40m

San Antonio

Mon 11/17

6:22 pm-12:46 am

1 stop5h 24m

$233

Flights are sorted by cheapest round-trip flights first.

Deals found on 10/22

Showing 1-10 of 18 results
1
2

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 October 17, 2025.

Booking 48 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, July is the cheapest month in which you can book a flight from Key Largo to San Antonio (average of $34). Flying from Key Largo to San Antonio in December is currently the most expensive (average of $122). 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 October 23, 2025.

One of the essential ways to save on airfare from Key Largo to San Antonio is to remain as flexible as possible. Flights that are in the morning tend to be the most expensive. A flight in the afternoon could potentially save you up to 21% on airfare.

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. Tuesday 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 October 23, 2025.

The most flights from KE9 to SAT are scheduled on a Monday (4 on average). You will have fewer flight options on Tuesday, 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 October 23, 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
4,236 reviews

Entertainment

7.5

Boarding

8.1

Crew

8.6

Food

7.0

Comfort

8.0

Overall

8.0

Reviews

1 / 20
2.0
Mediocre

Mike,Aug 2025

OKC - AUS

AC was not adequate, even on a night flight. WiFi subpar even for the airlines
Southwest
8.0
Very good
4,236 reviews
Southwest
8.0
Very good
4,236 reviews

Entertainment

7.5

Boarding

8.1

Crew

8.6

Food

7.0

Comfort

8.0

Overall

8.0

Reviews

1 / 20
2.0
Mediocre

Mike,Aug 2025

OKC - AUS

AC was not adequate, even on a night flight. WiFi subpar even for the airlines
Delta
7.9
Good
7,982 reviews
Southwest
8.0
Very good
4,236 reviews

Entertainment

7.5

Boarding

8.1

Crew

8.6

Food

7.0

Comfort

8.0

Overall

8.0

Reviews

1 / 20
2.0
Mediocre

Mike,Aug 2025

OKC - AUS

AC was not adequate, even on a night flight. WiFi subpar even for the airlines
United Airlines
7.4
Good
8,995 reviews
Southwest
8.0
Very good
4,236 reviews

Entertainment

7.5

Boarding

8.1

Crew

8.6

Food

7.0

Comfort

8.0

Overall

8.0

Reviews

1 / 20
2.0
Mediocre

Mike,Aug 2025

OKC - AUS

AC was not adequate, even on a night flight. WiFi subpar even for the airlines
American Airlines
7.2
Good
11,032 reviews
Southwest
8.0
Very good
4,236 reviews

Entertainment

7.5

Boarding

8.1

Crew

8.6

Food

7.0

Comfort

8.0

Overall

8.0

Reviews

1 / 20
2.0
Mediocre

Mike,Aug 2025

OKC - AUS

AC was not adequate, even on a night flight. WiFi subpar even for the airlines
Spirit Airlines
6.3
Okay
8,103 reviews
Southwest
8.0
Very good
4,236 reviews

Entertainment

7.5

Boarding

8.1

Crew

8.6

Food

7.0

Comfort

8.0

Overall

8.0

Reviews

1 / 20
2.0
Mediocre

Mike,Aug 2025

OKC - AUS

AC was not adequate, even on a night flight. WiFi subpar even for the airlines

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. 6 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, 3 users have taken a look at flights from Key Largo to San Antonio.

  • How long is the flight from Key Largo to San Antonio?

    Airlines like Southwest and American Airlines fly from Key Largo to San Antonio in about 3h 19m. The time it takes to get you to your destination can typically vary by up to 5h 46m. Key Largo and San Antonio are separated by a distance of 1140 mi. Both multi-stop and nonstop flights can be found to your destination and back.

  • 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 (100%), Royal Air Maroc (75%) and American Airlines (55%).

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

    While on average a flight from Key Largo to San Antonio is generally $313, our data shows the cheapest flight currently is $108. When looking at the most popular route, (Miami - San Antonio), you can expect to pay $166 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, July is the cheapest month in which you can book a flight from Key Largo to San Antonio (average of $34). Flying from Key Largo to San Antonio in December is currently the most expensive (average of $122). 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 6 airlines flying from Key Largo to San Antonio

Discover the top 6 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 October 23, 2025.
AirlineCheapestAverageFlexibilityOn-time
FrontierCheapest$81Average$201FlexibilityNo cancel feeOn-time62%
Spirit AirlinesCheapest$109Average$195FlexibilityNo cancel feeOn-time65%
American AirlinesCheapest$179Average$407FlexibilityNo cancel feeOn-time71%
United AirlinesCheapest$186Average$471FlexibilityNo cancel feeOn-time69%
DeltaCheapest$193Average$354FlexibilityNo cancel feeOn-timeN/A
SouthwestCheapest$248Average$434FlexibilityNo cancel feeOn-time63%

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