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$79+ 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 6/28. Fares are subject to change and may not be available on all flights or dates of travel.
MIA — SAT
jun. 17 — jun. 241
mar. 6/17
mar. 6/24
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 53 days in advance, depart on a Thursday or Wednesday and return on a Wednesday

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 junio 12, 2025.

Round-trip from

$162
(Priceline)

One-way from

$79
(FlightHub)

Popular in

April

Cheapest in

August

Average price

$405
From Key Largo to San Antonio
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One-way flight from Key Largo to San Antonio
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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 June 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 junio 12, 2025.

This Priceline deal was found by Cheapflights users on 6/10. 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 Priceline is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
mar. 7/18:55 pmMIA - SAT
1 stop9h 05mSpirit Airlines
mié. 7/97:52 pmSAT - MIA
1 stop8h 46mSpirit Airlines
Deal found 6/10$162
This American Airlines deal was found by Cheapflights users on 6/10. 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 American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
vie. 11/79:00 pmMIA - SAT
Nonstop3h 26mAmerican Airlines
mar. 11/115:41 amSAT - MIA
Nonstop2h 39mAmerican Airlines
Deal found 6/10$179
This Southwest deal was found by Cheapflights users on 6/10. 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 Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
jue. 7/32:20 pmMIA - SAT
1 stop6h 15mSouthwest
lun. 7/76:15 pmSAT - MIA
1 stop4h 40mSouthwest
Deal found 6/10$188
This Delta deal was found by Cheapflights users on 6/10. 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 Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
jue. 7/37:22 pmMIA - SAT
1 stop5h 55mDelta
mar. 7/86:11 pmSAT - MIA
1 stop5h 36mDelta
Deal found 6/10$219
This FlightHub deal was found by Cheapflights users on 6/10. 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 FlightHub is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
vie. 7/117:00 amMIA - SAT
1 stop12h 36mMultiple Airlines
dom. 7/138:14 pmSAT - MIA
1 stop9h 16mMultiple Airlines
Deal found 6/10$229
This Frontier deal was found by Cheapflights users on 6/10. 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 Frontier is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
jue. 8/286:00 amMIA - SAT
1 stop14h 33mFrontier
dom. 8/318:18 pmSAT - MIA
1 stop9h 12mFrontier
Deal found 6/10$236

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 junio 12, 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

mar. 7/1

8:55 pm-5:00 am

1 stop9h 05m

San Antonio

mié. 7/9

7:52 pm-5:38 am

1 stop8h 46m

$162

MiamiSan Antonio

MIA - SAT

MIASAT

Miami

vie. 11/7

9:00 pm-11:26 pm

Nonstop3h 26m

San Antonio

mar. 11/11

5:41 am-9:20 am

Nonstop2h 39m

$179

MiamiSan Antonio

MIA - SAT

MIASAT

Miami

jue. 7/3

2:20 pm-7:35 pm

1 stop6h 15m

San Antonio

lun. 7/7

6:15 pm-11:55 pm

1 stop4h 40m

$188

MiamiSan Antonio

MIA - SAT

MIASAT

Miami

jue. 7/3

7:22 pm-12:17 am

1 stop5h 55m

San Antonio

mar. 7/8

6:11 pm-12:47 am

1 stop5h 36m

$219

MiamiSan Antonio

MIA - SAT

MIASAT

Miami

vie. 7/11

7:00 am-6:36 pm

1 stop12h 36m

San Antonio

dom. 7/13

8:14 pm-6:30 am

1 stop9h 16m

$229

MiamiSan Antonio

MIA - SAT

MIASAT

Miami

jue. 8/28

6:00 am-7:33 pm

1 stop14h 33m

San Antonio

dom. 8/31

8:18 pm-6:30 am

1 stop9h 12m

$236

MiamiSan Antonio

MIA - SAT

MIASAT

Miami

sáb. 6/28

8:55 pm-5:00 am

1 stop9h 05m

$79

MiamiSan Antonio

MIA - SAT

MIASAT

Miami

vie. 8/1

7:15 am-11:20 am

1 stop5h 05m

$84

MiamiSan Antonio

MIA - SAT

MIASAT

Miami

jue. 9/4

1:25 pm-10:48 pm

2 stops10h 23m

$124

MiamiSan Antonio

MIA - SAT

MIASAT

Miami

sáb. 7/12

6:00 am-6:02 pm

1 stop13h 02m

$141

Flights are sorted by cheapest round-trip flights first.

Deals found on 6/11

Showing 1-10 of 14 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 June 9, 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 junio 12, 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 junio 12, 2025.

The most flights from KE9 to SAT are scheduled on a Wednesday (3 on average). You will have fewer flight options on Monday, which is when the least amount of flights are scheduled (2 on average).

Rainfall in San Antonio by month

Plan your trip to San Antonio by taking into account the average rainfall totals by month.

In terms of precipitation, rainfall in San Antonio ranges from 1.6 - 3.7 inches per month. May is typically the wettest month, when rainfall can reach 3.7 in. December is typically the driest time to visit San Antonio when rainfall is around 1.6 in.

Temperature in San Antonio by month

Plan your trip to San Antonio by taking into account the average temperature totals by month.

If weather is an important factor for your trip to San Antonio, use this chart to help with planning. For those seeking warmer temperatures, July is the ideal time of year to visit, when temperatures reach an average of 84.2 F. Travelers looking to avoid the cold should look outside of January, when temperatures are typically at their lowest (around 51.8 F).

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 junio 12, 2025.
To help decide which airline to fly from Key Largo to San Antonio, see what other customers have to say about Alaska Airlines, Southwest and Delta. 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.
Alaska Airlines
8.0
Very good
10,000 reviews

Crew

8.5

Overall

8.0

Boarding

8.1

Comfort

7.8

Food

7.1

Entertainment

7.1

Reviews

1 / 20
10.0
Excellent

James,Apr 2025

LAX - SFO

Good flight except the uncontrollable cold air from the ceiling.
Alaska Airlines
8.0
Very good
10,000 reviews
Alaska Airlines
8.0
Very good
10,000 reviews

Crew

8.5

Overall

8.0

Boarding

8.1

Comfort

7.8

Food

7.1

Entertainment

7.1

Reviews

1 / 20
10.0
Excellent

James,Apr 2025

LAX - SFO

Good flight except the uncontrollable cold air from the ceiling.
Southwest
8.0
Very good
4,287 reviews
Alaska Airlines
8.0
Very good
10,000 reviews

Crew

8.5

Overall

8.0

Boarding

8.1

Comfort

7.8

Food

7.1

Entertainment

7.1

Reviews

1 / 20
10.0
Excellent

James,Apr 2025

LAX - SFO

Good flight except the uncontrollable cold air from the ceiling.
Delta
8.0
Very good
7,946 reviews
Alaska Airlines
8.0
Very good
10,000 reviews

Crew

8.5

Overall

8.0

Boarding

8.1

Comfort

7.8

Food

7.1

Entertainment

7.1

Reviews

1 / 20
10.0
Excellent

James,Apr 2025

LAX - SFO

Good flight except the uncontrollable cold air from the ceiling.
United Airlines
7.4
Good
8,790 reviews
Alaska Airlines
8.0
Very good
10,000 reviews

Crew

8.5

Overall

8.0

Boarding

8.1

Comfort

7.8

Food

7.1

Entertainment

7.1

Reviews

1 / 20
10.0
Excellent

James,Apr 2025

LAX - SFO

Good flight except the uncontrollable cold air from the ceiling.
American Airlines
7.2
Good
10,000 reviews
Alaska Airlines
8.0
Very good
10,000 reviews

Crew

8.5

Overall

8.0

Boarding

8.1

Comfort

7.8

Food

7.1

Entertainment

7.1

Reviews

1 / 20
10.0
Excellent

James,Apr 2025

LAX - SFO

Good flight except the uncontrollable cold air from the ceiling.

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 cheapest airlines to fly from Key Largo to San Antonio one-way?

    For one-way options, check prices for Spirit Airlines. According to our data, you can fly for as low as $79. Users have also found prices from $84 and $124 on Southwest and United Airlines, respectively.

  • 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 (94%), Royal Air Maroc (93%) and Qatar Airways (86%).

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

    While on average a flight from Key Largo to San Antonio is generally $290, our data shows the cheapest flight currently is $124. When looking at the most popular route, (Miami - San Antonio), you can expect to pay $186 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 Key Largo?

Book flights to Key Largo if you plan to visit one of these locations
New Braunfels

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Alternative routes for Key Largo to San Antonio

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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 junio 12, 2025.
AirlineCheapestAverageFlexibilityOn-time
Spirit AirlinesCheapest$95Average$177FlexibilityNo cancel feeOn-time65%
American AirlinesCheapest$172Average$357FlexibilityNo cancel feeOn-time71%
United AirlinesCheapest$187Average$426FlexibilityNo cancel feeOn-time69%
DeltaCheapest$196Average$371FlexibilityNo cancel feeOn-timeN/A
SouthwestCheapest$321Average$452FlexibilityNo cancel feeOn-time63%

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