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Key Largo

$87+ Cheap flights from San Antonio (SAT) to Key Largo, FL

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 11/3. Fares are subject to change and may not be available on all flights or dates of travel.
SAT — MIA
Oct 15 — Oct 221
Wed 10/15
Wed 10/22
1 adult, Economy
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Cheapflights Tip: The best prices from San Antonio to Key Largo are usually found in September or February, booked 25 days in advance, depart on a Friday or Tuesday and return on a Thursday

Cheap flight deals from San Antonio to Key Largo

Keep the following information in mind while searching for San Antonio to Key Largo flight deals. Data was last updated September 15, 2025.

Round-trip from

$173
(Frontier)

One-way from

$87
(Cheapflightsfares)

Popular in

January

Cheapest in

September

Average price

$320
From San Antonio to Key Largo
Search Deals
One-way flight from San Antonio to Key Largo
Search Deals
Highest demand for flights based on searches. 2% potential increase in price ($10 potential increase over avg. RT price).
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Cheapest flight prices on average. 1% potential price decrease ($6 potential savings vs. average RT price).
Search Deals
Average for round-trip flights in September 2025
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Find flight deals from San Antonio to Key Largo

Cheapest flights from San Antonio to Key Largo
Explore the most affordable flight options available from San Antonio to Key Largo. Find the lowest fares from popular airlines and budget airlines, with prices last updated on September 15, 2025.

This Frontier deal was found by Cheapflights users on 9/14. 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 10/248:26 pmSAT - MIA
1 stop8h 53mFrontier
Sat 11/16:00 amMIA - SAT
1 stop9h 17mFrontier
Deal found 9/14$173
This Frontier deal was found by Cheapflights users on 9/15. 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 Frontier is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 10/308:43 pmSAT - MIA
1 stop8h 36mFrontier
Thu 11/66:00 amMIA - SAT
1 stop14h 30mFrontier
Deal found 9/15$174
This Southwest deal was found by Cheapflights users on 9/13. 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 Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 11/116:30 amSAT - MIA
2 stops8h 45mSouthwest
Sat 11/156:05 amMIA - SAT
2 stops6h 50mSouthwest
Deal found 9/13$176
This American Airlines deal was found by Cheapflights users on 9/14. 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.
Tue 10/75:30 amSAT - MIA
Nonstop2h 45mAmerican Airlines
Sat 10/113:30 pmMIA - SAT
Nonstop3h 06mAmerican Airlines
Deal found 9/14$179
This Frontier deal was found by Cheapflights users on 9/14. 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 10/315:35 pmSAT - MIA
1 stop5h 59mFrontier
Sun 11/27:07 pmMIA - SAT
1 stop22h 33mFrontier
Deal found 9/14$181
This Southwest deal was found by Cheapflights users on 9/13. 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 Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 10/255:50 amSAT - MIA
1 stop13h 40mSouthwest
Wed 10/294:35 pmMIA - SAT
1 stop7h 40mSouthwest
Deal found 9/13$184
This American Airlines deal was found by Cheapflights users on 9/12. 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 American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 10/165:30 amSAT - MIA
Nonstop2h 45mAmerican Airlines
Tue 10/217:42 pmMIA - SAT
Nonstop3h 16mAmerican Airlines
Deal found 9/12$188
This Frontier deal was found by Cheapflights users on 9/14. 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 10/175:45 pmSAT - MIA
1 stop5h 49mFrontier
Sun 10/199:57 pmMIA - SAT
2 stops19h 53mFrontier
Deal found 9/14$189
This Frontier deal was found by Cheapflights users on 9/14. 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 10/37:25 pmSAT - MIA
2 stops14h 58mFrontier
Mon 10/65:30 amMIA - SAT
1 stop12h 00mFrontier
Deal found 9/14$190
This American Airlines deal was found by Cheapflights users on 9/13. 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.
Mon 9/295:29 amSAT - MIA
Nonstop2h 51mAmerican Airlines
Fri 10/317:42 pmMIA - SAT
Nonstop3h 16mAmerican Airlines
Deal found 9/13$194
This Frontier deal was found by Cheapflights users on 9/13. 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 Frontier is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 10/168:26 pmSAT - MIA
1 stop8h 53mFrontier
Sun 10/195:15 amMIA - SAT
1 stop12h 37mFrontier
Deal found 9/13$198
This Frontier deal was found by Cheapflights users on 9/13. 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 Frontier is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 11/75:35 pmSAT - MIA
1 stop5h 59mFrontier
Mon 11/105:01 amMIA - SAT
1 stop12h 39mFrontier
Deal found 9/13$199

Cheapflights Fare Finder

 
Customize your flight search to find flights from San Antonio to Key Largo 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 September 15, 2025.
Use the filters below to find and compare flights from San Antonio to Key Largo that are best for you.

Fly from

San Antonio

Fly to

Key Largo

Route

Depart

Return

Price

San AntonioMiami

SAT - MIA

SATMIA

San Antonio

Tue 10/14

5:35 am-3:55 pm

1 stop9h 20m

Miami

Tue 10/21

4:35 pm-11:15 pm

1 stop7h 40m

$179

San AntonioMiami

SAT - MIA

SATMIA

San Antonio

Sat 10/25

5:50 am-8:30 pm

1 stop13h 40m

Miami

Wed 10/29

4:35 pm-11:15 pm

1 stop7h 40m

$184

San AntonioMiami

SAT - MIA

SATMIA

San Antonio

Mon 10/6

4:20 pm-10:50 pm

1 stop5h 30m

Miami

Wed 10/8

6:55 am-1:20 pm

2 stops7h 25m

$204

San AntonioMiami

SAT - MIA

SATMIA

San Antonio

Fri 10/24

6:12 pm-9:58 pm

Nonstop2h 46m

Miami

Sat 11/1

7:43 pm-10:03 pm

Nonstop3h 20m

$223

San AntonioMiami

SAT - MIA

SATMIA

San Antonio

Tue 9/30

5:35 am-4:40 pm

1 stop10h 05m

Miami

Tue 10/7

4:35 pm-11:15 pm

1 stop7h 40m

$224

San AntonioMiami

SAT - MIA

SATMIA

San Antonio

Wed 10/1

1:10 pm-9:15 pm

1 stop7h 05m

Miami

Sat 10/4

5:45 am-10:40 am

1 stop5h 55m

$224

San AntonioMiami

SAT - MIA

SATMIA

San Antonio

Wed 10/1

1:10 pm-9:15 pm

1 stop7h 05m

Miami

Wed 10/8

6:55 am-2:50 pm

2 stops8h 55m

$229

San AntonioMiami

SAT - MIA

SATMIA

San Antonio

Sat 10/25

5:20 am-9:05 am

Nonstop2h 45m

Miami

Wed 10/29

1:39 pm-7:25 pm

1 stop6h 46m

$233

San AntonioMiami

SAT - MIA

SATMIA

San Antonio

Sat 10/4

7:25 am-4:40 pm

1 stop8h 15m

Miami

Wed 10/8

6:55 am-1:20 pm

2 stops7h 25m

$235

San AntonioMiami

SAT - MIA

SATMIA

San Antonio

Mon 10/13

6:15 pm-11:15 pm

1 stop4h 00m

$90

Flights are sorted by cheapest round-trip flights first.

Deals found on 9/13

Showing 1-10 of 17 results
1
2

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

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

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

Use this chart to determine the optimal time to book a round-trip flight from San Antonio to Key Largo. Price data was last updated on September 12, 2025.

The price you pay for your flight from San Antonio to Key Largo may vary depending on when you book. For the best chance of a lower fare, look to book 25 days in advance of your trip. Fares are likely to increase a fortnight or so before your departure date.

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

Currently, September is the cheapest month in which you can book a flight from San Antonio to Key Largo (average of $232). Flying from San Antonio to Key Largo in March is currently the most expensive (average of $289). 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 SAT to KE9?

Find hourly flight availability from San Antonio to Key Largo. Discover flight options and departure times throughout the day, allowing you to choose a departure time that suits your schedule. Data last updated September 15, 2025.

When flying from San Antonio to Key Largo, 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 San Antonio to Key Largo?

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

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

Weekly flight availability from San Antonio to Key Largo

Explore weekly flight availability from San Antonio to Key Largo. 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 September 15, 2025.

The most flights from SAT to KE9 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).

How much does it cost to fly round-trip from San Antonio to Key Largo?

Reviews of airlines servicing Key Largo

Get insights into the airlines that provide service to Key Largo. 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 Key Largo. Reviews last updated September 15, 2025.
Read through reviews of airlines operating flights from San Antonio to Key Largo, such as Southwest, Delta, and United Airlines. Reviews also offer insight into each airline's entertainment options, comfort, food, crew/service, and boarding process.
Southwest
8.0
Very good
4,242 reviews

Crew

8.6

Entertainment

7.5

Overall

8.0

Boarding

8.1

Comfort

8.0

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
4,242 reviews
Southwest
8.0
Very good
4,242 reviews

Crew

8.6

Entertainment

7.5

Overall

8.0

Boarding

8.1

Comfort

8.0

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
7,954 reviews
Southwest
8.0
Very good
4,242 reviews

Crew

8.6

Entertainment

7.5

Overall

8.0

Boarding

8.1

Comfort

8.0

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
8,929 reviews
Southwest
8.0
Very good
4,242 reviews

Crew

8.6

Entertainment

7.5

Overall

8.0

Boarding

8.1

Comfort

8.0

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
4,242 reviews

Crew

8.6

Entertainment

7.5

Overall

8.0

Boarding

8.1

Comfort

8.0

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
8,015 reviews
Southwest
8.0
Very good
4,242 reviews

Crew

8.6

Entertainment

7.5

Overall

8.0

Boarding

8.1

Comfort

8.0

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 San Antonio to Key Largo. 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 San Antonio to Key Largo?

    Most people fly from San Antonio (SAT) if they book a flight from San Antonio to Key Largo. On average, San Antonio has 2 outbound flights to Key Largo per day from 5 airlines. San Antonio is conveniently located just 7.6 mi from San Antonio’s city center.

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

    This flight path from San Antonio to Key Largo was viewed by 5 users in the past month. Keep an eye out for changes in search interest prior to high and low season.

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

    A quick flight from San Antonio to Key Largo can take about 2h 46m. Southwest provides one of the quickest options available for as low as $223. Airlines will cover a distance of 1140 mi. When browsing for deals, the options you’ll see will be for both nonstop flights and flights with stops.

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

    Consider Qatar Airways (85%), American Airlines (75%) or Envoy Air (66%) when booking your flight. These represent the most reliable airlines when flying from San Antonio to Key Largo.

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

    Looking for the cheapest flight from San Antonio to Key Largo? While on average our users pay $432, our data indicates the cheapest price to be $187. The most popular route (San Antonio - Miami), is priced around $166.

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

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

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

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

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

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

    Currently, September is the cheapest month in which you can book a flight from San Antonio to Key Largo (average of $232). Flying from San Antonio to Key Largo in March is currently the most expensive (average of $289). 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.

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Top 5 airlines flying from San Antonio to Key Largo

Discover the top 5 airlines that operate flights from San Antonio to Key Largo. 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 September 15, 2025.
AirlineCheapestAverageFlexibilityOn-time
Spirit AirlinesCheapest$100Average$199FlexibilityNo cancel feeOn-time65%
SouthwestCheapest$189Average$474FlexibilityNo cancel feeOn-time63%
American AirlinesCheapest$216Average$445FlexibilityNo cancel feeOn-time71%
DeltaCheapest$216Average$377FlexibilityNo cancel feeOn-timeN/A
United AirlinesCheapest$257Average$459FlexibilityNo cancel feeOn-time69%

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