HomeSearch by dateVacation packagesHotelsFlight dealsCar rentalTravel tips & news
Key Largo

$64+ 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 2/28. Fares are subject to change and may not be available on all flights or dates of travel.
SAT — MIA
Jan 20 — Jan 271
Tue 1/20
Tue 1/27
1 adult, Economy
We work with more than 300 partners to bring you better travel deals

Find cheap flights from San Antonio to Key Largo with Cheapflights

1. Tell us where you want to go

Enter your travel information like dates, passengers, trip type (one-way or round trip), and preferred cabin class then click “Find deals”

2. Select your favorite providers

We find the providers serving your travel needs. Choose up to four travel providers to compare side-by-side for flights, hotels, or car rentals.

3. Compare prices and book

Review each provider’s pricing and select the best option for you! Book through your favorite provider’s website for a seamless experience.

Cheapflights Tip: The best prices from San Antonio to Key Largo are usually found in October or March, booked 25 days in advance, depart on a Friday or Monday and return on a Thursday

Cheap 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 December 21, 2025.

This Priceline deal was found by Cheapflights users on 12/21. 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.
Wed 12/315:56 pmSAT - MIA
1 stop5h 51mFrontier
Thu 1/16:05 amMIA - SAT
1 stop8h 09mFrontier
Deal found 12/21$253
This Expedia deal was found by Cheapflights users on 12/19. 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 Expedia is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 12/245:56 pmSAT - MIA
1 stop5h 51mFrontier
Wed 12/316:05 amMIA - SAT
1 stop19h 12mFrontier
Deal found 12/19$293
This Frontier deal was found by Cheapflights users on 12/21. 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.
Wed 12/315:56 pmSAT - MIA
1 stop5h 51mFrontier
Mon 1/55:30 amMIA - SAT
1 stop12h 31mFrontier
Deal found 12/21$312
This Frontier deal was found by Cheapflights users on 12/20. 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.
Wed 12/315:56 pmSAT - MIA
1 stop5h 51mFrontier
Fri 1/25:30 amMIA - SAT
1 stop12h 31mFrontier
Deal found 12/20$317
This Delta deal was found by Cheapflights users on 12/21. 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.
Wed 12/315:20 amSAT - MIA
1 stop9h 50mDelta
Wed 1/75:50 amMIA - SAT
1 stop7h 55mDelta
Deal found 12/21$339
This Kiwi.com deal was found by Cheapflights users on 12/21. 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.
Wed 12/312:09 pmSAT - MIA
1 stop13h 51mFrontier
Wed 1/77:09 pmMIA - SAT
2 stops39h 09mFrontier
Deal found 12/21$343
This Expedia deal was found by Cheapflights users on 12/19. 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 Expedia is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 12/245:56 pmSAT - MIA
1 stop5h 51mMultiple Airlines
Wed 12/318:00 amMIA - SAT
2 stops16h 26mMultiple Airlines
Deal found 12/19$348
This American Airlines deal was found by Cheapflights users on 12/20. 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.
Sun 12/285:00 amSAT - MIA
Nonstop2h 56mAmerican Airlines
Sat 1/249:31 pmMIA - SAT
Nonstop3h 28mAmerican Airlines
Deal found 12/20$358
This Super.com deal was found by Cheapflights users on 12/20. 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 Super.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 12/292:01 pmSAT - MIA
1 stop14h 34mFrontier
Thu 1/16:05 amMIA - SAT
1 stop8h 09mFrontier
Deal found 12/20$361
This Expedia deal was found by Cheapflights users on 12/19. 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 Expedia is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 12/225:56 pmSAT - MIA
1 stop5h 55mFrontier
Wed 12/245:30 amMIA - SAT
1 stop12h 31mFrontier
Deal found 12/19$363
This Kiwi.com deal was found by Cheapflights users on 12/20. 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.
Mon 12/297:11 pmSAT - MIA
2 stops28h 36mFrontier
Sat 1/247:09 pmMIA - SAT
1 stop22h 54mFrontier
Deal found 12/20$367

Find 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 December 21, 2025.

Most accurate provider

CheapOair
3 stars

Most trusted provider

CheapOair
3 stars

Round-trip from

$155
(Frontier)

One-way from

$64
(Priceline)

Popular in

December

Cheapest in

October

Average price

$490
Provider with most accurate pricing for San Antonio-Miami flight deals.
Search Deals
Provider most trusted by Cheapflights users for San Antonio-Miami flights.
Search Deals
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. 8% potential increase in price ($37 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 December 2025
Search Deals

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 December 21, 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

Sun 2/1

4:25 pm-9:55 pm

1 stop4h 30m

Miami

Thu 2/5

6:30 am-1:45 pm

1 stop8h 15m

$199

San AntonioMiami

SAT - MIA

SATMIA

San Antonio

Mon 2/2

5:45 am-4:10 pm

1 stop9h 25m

Miami

Fri 2/6

6:30 am-1:45 pm

1 stop8h 15m

$199

San AntonioMiami

SAT - MIA

SATMIA

San Antonio

Mon 1/12

6:10 am-4:30 pm

1 stop9h 20m

Miami

Sat 1/17

9:50 am-5:50 pm

1 stop9h 00m

$209

San AntonioMiami

SAT - MIA

SATMIA

San Antonio

Sun 2/15

5:55 pm-12:53 am

1 stop5h 58m

Miami

Tue 2/24

4:36 pm-10:28 pm

1 stop6h 52m

$217

San AntonioMiami

SAT - MIA

SATMIA

San Antonio

Fri 2/6

6:13 pm-12:47 am

1 stop5h 34m

Miami

Mon 2/9

7:00 am-7:33 pm

1 stop13h 33m

$217

San AntonioMiami

SAT - MIA

SATMIA

San Antonio

Tue 2/10

4:29 pm-12:51 am

1 stop7h 22m

Miami

Sat 2/21

6:00 am-12:40 pm

1 stop7h 40m

$217

San AntonioMiami

SAT - MIA

SATMIA

San Antonio

Fri 2/27

5:04 pm-12:42 am

1 stop6h 38m

Miami

Thu 3/5

6:45 am-7:30 pm

1 stop13h 45m

$226

San AntonioMiami

SAT - MIA

SATMIA

San Antonio

Fri 1/23

10:35 am-12:56 pm

2 stops25h 21m

Miami

Sun 2/1

7:00 am-9:30 am

2 stops27h 30m

$248

San AntonioMiami

SAT - MIA

SATMIA

San Antonio

Thu 2/5

6:40 am-1:10 pm

1 stop5h 30m

Miami

Fri 2/6

6:30 am-1:45 pm

1 stop8h 15m

$249

San AntonioMiami

SAT - MIA

SATMIA

San Antonio

Fri 3/6

3:26 pm-12:47 am

1 stop8h 21m

Miami

Mon 3/9

5:05 am-2:41 pm

1 stop10h 36m

$250

Flights are sorted by cheapest round-trip flights first.

Deals found on 12/19

Showing 1-10 of 20 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 December 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, December is the cheapest month in which you can book a flight from San Antonio to Key Largo (average of $58). Flying from San Antonio to Key Largo in April is currently the most expensive (average of $105). 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 December 21, 2025.

A simple way to save on the total cost of your ticket is to fly from San Antonio to Key Largo in the morning. If you’re flexible enough to do this you can expect to save up to 20% on your trip compared to booking a flight at noon.

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 mornings 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 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 December 21, 2025.

The most flights from SAT to KE9 are scheduled on a Monday (4 on average). You will have fewer flight options on Monday, which is when the least amount of flights are scheduled (4 on average).

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 December 21, 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
4,258 reviews

Food

7.0

Entertainment

7.5

Boarding

8.1

Overall

8.0

Comfort

8.0

Crew

8.6

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
4,258 reviews
Southwest
8.0
Very good
4,258 reviews

Food

7.0

Entertainment

7.5

Boarding

8.1

Overall

8.0

Comfort

8.0

Crew

8.6

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
7.9
Good
8,021 reviews
Southwest
8.0
Very good
4,258 reviews

Food

7.0

Entertainment

7.5

Boarding

8.1

Overall

8.0

Comfort

8.0

Crew

8.6

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
9,100 reviews
Southwest
8.0
Very good
4,258 reviews

Food

7.0

Entertainment

7.5

Boarding

8.1

Overall

8.0

Comfort

8.0

Crew

8.6

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
11,050 reviews
Southwest
8.0
Very good
4,258 reviews

Food

7.0

Entertainment

7.5

Boarding

8.1

Overall

8.0

Comfort

8.0

Crew

8.6

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
8,194 reviews
Southwest
8.0
Very good
4,258 reviews

Food

7.0

Entertainment

7.5

Boarding

8.1

Overall

8.0

Comfort

8.0

Crew

8.6

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 4 outbound flights to Key Largo per day from 6 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 6 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 50m. Frontier provides one of the quickest options available for as low as $179. 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 cheapest airlines to fly from San Antonio to Key Largo one-way?

    One-way options have recently been found by users for as low as $55 on Spirit Airlines. Other airlines that offer cheap prices include Frontier from $73 and Southwest from $99 one-way.

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

    Consider Envoy Air (100%), American Airlines (79%) or Qatar Airways (71%) 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 $443, our data indicates the cheapest price to be $169. The most popular route (San Antonio - Miami), is priced around $199.

  • 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, December is the cheapest month in which you can book a flight from San Antonio to Key Largo (average of $58). Flying from San Antonio to Key Largo in April is currently the most expensive (average of $105). 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

Browse thousands of different options on Cheapflights for your next trip

Toggle through the tabs below to find thousands of options on Cheapflights for your next trip.

Alternative routes for San Antonio to Key Largo

See prices for flight routes from nearby airports that may be better suited for you.
Dallas/Fort Worth to Orlando flights
Dallas/Fort Worth to Miami flights
Dallas/Fort Worth to Fort Lauderdale flights
Hobby to Orlando flights
Hobby to Miami flights
Hobby to Fort Lauderdale flights
George Bush Intcntl to Orlando flights
Dallas/Fort Worth to Tampa flights
George Bush Intcntl to Fort Lauderdale flights
George Bush Intcntl to Miami flights
Love Field to Miami flights
Austin to Miami flights
Austin to Orlando flights
Love Field to Orlando flights
Austin to Fort Lauderdale flights
Hobby to Tampa flights
George Bush Intcntl to Tampa flights
Dallas/Fort Worth to West Palm Beach flights
Dallas/Fort Worth to Fort Myers flights
San Antonio to Orlando flights
Love Field to Fort Lauderdale flights
Dallas/Fort Worth to Jacksonville flights
Hobby to West Palm Beach flights
San Antonio to Miami flights
Love Field to Tampa flights
Austin to Tampa flights
George Bush Intcntl to West Palm Beach flights
Dallas/Fort Worth to Pensacola flights
San Antonio to Fort Lauderdale flights
Dallas/Fort Worth to Sarasota flights
Hobby to Jacksonville flights
Hobby to Fort Myers flights
Dallas/Fort Worth to Key West flights
George Bush Intcntl to Jacksonville flights
Love Field to Fort Myers flights
San Antonio to Tampa flights
Hobby to Pensacola flights
George Bush Intcntl to Fort Myers flights
Love Field to Jacksonville flights
Austin to Fort Myers flights
George Bush Intcntl to Pensacola flights
Austin to West Palm Beach flights
Hobby to Key West flights
Love Field to West Palm Beach flights
Austin to Jacksonville flights
Love Field to Pensacola flights
Love Field to Sarasota flights
Dallas/Fort Worth to Valparaiso flights
Dallas/Fort Worth to Daytona Beach flights
George Bush Intcntl to Key West flights

Top 6 airlines flying from San Antonio to Key Largo

Discover the top 6 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 December 21, 2025.
AirlineCheapestAverageFlexibilityOn-time
Spirit AirlinesCheapest$97Average$195FlexibilityNo cancel feeOn-time65%
FrontierCheapest$109Average$178FlexibilityNo cancel feeOn-time62%
SouthwestCheapest$178Average$468FlexibilityNo cancel feeOn-time63%
American AirlinesCheapest$199Average$417FlexibilityNo cancel feeOn-time71%
DeltaCheapest$216Average$382FlexibilityNo cancel feeOn-timeN/A
United AirlinesCheapest$288Average$463FlexibilityNo cancel feeOn-time69%

100% Free

Cheapflights is completely free to use, so you can start saving the moment you arrive.

Book with Flexibility

Our users can plan ahead with confidence and find flights with no change fees

Travel Smart

Millions of people come to us for their flight needs every year. We help make travel planning easy by providing useful insights and data-driven graphs that can inform your decisions.
Site
©2025 Cheapflights