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Key Largo

$107+ Cheap flights from San Francisco (SFO) 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 3/28. Fares are subject to change and may not be available on all flights or dates of travel.
SFO — MIA
Mar 20 — Mar 271
Fri 3/20
Fri 3/27
1 adult, Economy
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Cheapflights Tip: The best prices from San Francisco to Key Largo are usually found in August or September, booked 21 days in advance, depart on a Monday or Wednesday and return on a Friday

Cheap flight deals from San Francisco to Key Largo

Cheapest flights from San Francisco to Key Largo
Explore the most affordable flight options available from San Francisco to Key Largo. Find the lowest fares from popular airlines and budget airlines, with prices last updated on February 18, 2026.

This Kiwi.com deal was found by Cheapflights users on 2/16. 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 3/1710:40 pm
SFO
-
MIA
1 stop8h 54m
Frontier
Wed 3/183:16 pm
MIA
-
SFO
2 stops36h 12m
Frontier
Deal found 2/16$250
This Super.com deal was found by Cheapflights users on 2/17. 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.
Wed 3/1810:38 pm
SFO
-
MIA
1 stop8h 56m
Frontier
Wed 3/255:50 am
MIA
-
SFO
1 stop17h 19m
Frontier
Deal found 2/17$251
This Kiwi.com deal was found by Cheapflights users on 2/16. 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 2/257:20 am
SFO
-
MIA
1 stop18h 54m
Multiple Airlines
Tue 3/34:44 pm
MIA
-
SFO
1 stop10h 00m
Multiple Airlines
Deal found 2/16$252
This CheapOair deal was found by Cheapflights users on 2/16. 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 CheapOair is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 4/2310:38 pm
SFO
-
MIA
1 stop8h 39m
Frontier
Sun 4/268:42 am
MIA
-
SFO
1 stop26h 36m
Frontier
Deal found 2/16$253
This Frontier deal was found by Cheapflights users on 2/17. 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.
Mon 3/96:00 am
SFO
-
MIA
1 stop8h 20m
Frontier
Thu 3/1912:26 pm
MIA
-
SFO
1 stop9h 48m
Frontier
Deal found 2/17$254
This CheapOair deal was found by Cheapflights users on 2/16. 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 CheapOair is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 3/69:04 pm
SFO
-
MIA
1 stop28h 45m
Frontier
Mon 3/98:47 pm
MIA
-
SFO
1 stop26h 22m
Frontier
Deal found 2/16$255
This Frontier deal was found by Cheapflights users on 2/17. 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.
Sat 2/2811:16 pm
SFO
-
MIA
1 stop8h 12m
Frontier
Fri 3/612:16 pm
MIA
-
SFO
1 stop9h 58m
Frontier
Deal found 2/17$256
This Delta deal was found by Cheapflights users on 2/14. 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 Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 11/47:00 am
SFO
-
MIA
1 stop7h 41m
Delta
Thu 11/123:35 pm
MIA
-
SFO
1 stop10h 16m
Delta
Deal found 2/14$257
This Kiwi.com deal was found by Cheapflights users on 2/18. 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 3/610:38 pm
SFO
-
MIA
1 stop8h 56m
Multiple Airlines
Tue 3/107:05 am
MIA
-
SFO
2 stops16h 04m
Multiple Airlines
Deal found 2/18$258
This United Airlines deal was found by Cheapflights users on 2/17. 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 United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 10/2912:45 am
SFO
-
MIA
1 stop7h 11m
United Airlines
Sat 10/314:06 pm
MIA
-
SFO
1 stop11h 08m
United Airlines
Deal found 2/17$259
This Frontier deal was found by Cheapflights users on 2/16. 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.
Sat 3/76:33 pm
SFO
-
MIA
1 stop7h 16m
Frontier
Thu 3/2612:26 pm
MIA
-
SFO
1 stop9h 48m
Frontier
Deal found 2/16$260
This American Airlines deal was found by Cheapflights users on 2/17. 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.
Wed 4/156:15 am
SFO
-
MIA
Nonstop5h 35m
American Airlines
Tue 4/217:40 pm
MIA
-
SFO
Nonstop6h 21m
American Airlines
Deal found 2/17$261

Find flight deals from San Francisco to Key Largo

Keep the following information in mind while searching for San Francisco to Key Largo flight deals. Data was last updated February 18, 2026.

Most accurate provider

FlightHub
3 stars

Most trusted provider

FlightHub
3 stars

Round-trip from

$250
(Kiwi.com)

One-way from

$107

Popular in

December

Cheapest in

August

Average price

$421
Provider with most accurate pricing for San Francisco-Miami flight deals.
Search Deals
Provider most trusted by Cheapflights users for San Francisco-Miami flights.
Search Deals
From San Francisco to Key Largo
Search Deals
One-way flight from San Francisco 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 ($10 potential savings vs. average RT price).
Search Deals
Average for round-trip flights in February 2026
Search Deals

Cheapflights Fare Finder

 
Customize your flight search to find flights from San Francisco 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 February 18, 2026.
Use the filters below to find and compare flights from San Francisco to Key Largo that are best for you.

Fly from

San Francisco

Fly to

Key Largo

Route

Depart

Return

Price

San FranciscoMiami

SFO - MIA

SFOMIA

San Francisco

Sat 4/18

6:40 am-7:54 pm

1 stop10h 14m

Miami

Tue 4/21

7:15 am-10:46 am

Nonstop6h 31m

$250

San FranciscoMiami

SFO - MIA

SFOMIA

San Francisco

Sat 5/16

11:50 pm-8:29 am

Nonstop5h 39m

Miami

Wed 5/20

4:15 pm-12:30 am

1 stop11h 15m

$250

San FranciscoMiami

SFO - MIA

SFOMIA

San Francisco

Wed 3/18

5:50 am-5:08 pm

1 stop8h 18m

Miami

Tue 3/24

8:05 am-3:03 pm

1 stop9h 58m

$257

San FranciscoMiami

SFO - MIA

SFOMIA

San Francisco

Sat 3/14

6:46 pm-5:51 am

1 stop8h 05m

Miami

Tue 3/17

6:15 am-12:42 pm

1 stop9h 27m

$257

San FranciscoMiami

SFO - MIA

SFOMIA

San Francisco

Tue 3/17

11:25 pm-11:40 am

1 stop9h 15m

Miami

Wed 3/18

12:40 pm-10:05 pm

1 stop12h 25m

$264

San FranciscoMiami

SFO - MIA

SFOMIA

San Francisco

Wed 3/18

11:00 pm-7:27 am

Nonstop5h 27m

Miami

Wed 3/25

7:23 am-10:59 am

Nonstop6h 36m

$272

San FranciscoMiami

SFO - MIA

SFOMIA

San Francisco

Wed 4/1

8:29 am-5:11 pm

Nonstop5h 42m

Miami

Wed 4/8

7:15 am-10:46 am

Nonstop6h 31m

$272

San FranciscoMiami

SFO - MIA

SFOMIA

San Francisco

Wed 3/4

12:43 am-1:24 pm

1 stop9h 41m

Miami

Tue 3/10

7:23 am-10:59 am

Nonstop6h 36m

$276

San FranciscoMiami

SFO - MIA

SFOMIA

San Francisco

Sat 5/16

6:30 pm-6:45 am

1 stop9h 15m

Miami

Sun 5/24

8:00 am-1:36 pm

1 stop8h 36m

$277

San FranciscoMiami

SFO - MIA

SFOMIA

San Francisco

Sun 2/22

8:32 am-4:56 pm

Nonstop5h 24m

Miami

Sat 3/7

7:23 am-10:59 am

Nonstop6h 36m

$278

Flights are sorted by cheapest round-trip flights first.

Deals found on 2/15

Showing 1-10 of 22 results
1
2
3

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

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

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

Use this chart to determine the optimal time to book a round-trip flight from San Francisco to Key Largo. Price data was last updated on February 13, 2026.

To ensure you get the cheapest price possible for a flight from San Francisco to Key Largo, you should look to book at least 21 days in advance of your intended travel date. The price of your flight may increase if you delay and leave booking until a week or so before departure.

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

Currently, May is the cheapest month in which you can book a flight from San Francisco to Key Largo (average of $98). Flying from San Francisco to Key Largo in February is currently the most expensive (average of $183). 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 SFO to KE9?

Find hourly flight availability from San Francisco 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 February 18, 2026.

Unlike in the evening, when flights are generally more expensive, you can save up to 16% on flights from San Francisco to Key Largo by exploring options for tickets in the morning.

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

Use this chart to determine the cheapest time to fly round-trip from San Francisco to Key Largo. Price data was last updated on February 17, 2026.

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

Weekly flight availability from San Francisco to Key Largo

Explore weekly flight availability from San Francisco 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 February 18, 2026.

The most flights from SFO to KE9 are scheduled on a Monday (26 on average). You will have fewer flight options on Wednesday, which is when the least amount of flights are scheduled (17 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 February 18, 2026.
Peruse reviews from past customers who have flown with Delta, United Airlines, and American Airlines from San Francisco to Key Largo to help guide your decision. You can also see how each airline stacks up in terms of entertainment options, comfort, food, crew/service, and boarding process.
Delta
7.9
Good
8,208 reviews

Crew

8.5

Entertainment

7.8

Boarding

8.1

Comfort

7.9

Food

7.2

Overall

7.9

Reviews

1 / 20
2.0
Mediocre

Joseph,Aug 2023

MSP - MCO

Even if you have delta comfort plus, they will move your overhead bag. One of the perks for upgrading is that you have dedicated space for your carry on with comfort plus with delta. They moved my carry on luggage (3) compartments back and put in bags for other passengers that should have gone under their respective seats. When deboarding the plane, there was no help from anyone to retrieve my luggage back several rows. Delta is turning into pure garbage.
Delta
7.9
Good
8,208 reviews
Delta
7.9
Good
8,208 reviews

Crew

8.5

Entertainment

7.8

Boarding

8.1

Comfort

7.9

Food

7.2

Overall

7.9

Reviews

1 / 20
2.0
Mediocre

Joseph,Aug 2023

MSP - MCO

Even if you have delta comfort plus, they will move your overhead bag. One of the perks for upgrading is that you have dedicated space for your carry on with comfort plus with delta. They moved my carry on luggage (3) compartments back and put in bags for other passengers that should have gone under their respective seats. When deboarding the plane, there was no help from anyone to retrieve my luggage back several rows. Delta is turning into pure garbage.
United Airlines
7.4
Good
9,312 reviews
Delta
7.9
Good
8,208 reviews

Crew

8.5

Entertainment

7.8

Boarding

8.1

Comfort

7.9

Food

7.2

Overall

7.9

Reviews

1 / 20
2.0
Mediocre

Joseph,Aug 2023

MSP - MCO

Even if you have delta comfort plus, they will move your overhead bag. One of the perks for upgrading is that you have dedicated space for your carry on with comfort plus with delta. They moved my carry on luggage (3) compartments back and put in bags for other passengers that should have gone under their respective seats. When deboarding the plane, there was no help from anyone to retrieve my luggage back several rows. Delta is turning into pure garbage.
American Airlines
7.2
Good
11,304 reviews
Delta
7.9
Good
8,208 reviews

Crew

8.5

Entertainment

7.8

Boarding

8.1

Comfort

7.9

Food

7.2

Overall

7.9

Reviews

1 / 20
2.0
Mediocre

Joseph,Aug 2023

MSP - MCO

Even if you have delta comfort plus, they will move your overhead bag. One of the perks for upgrading is that you have dedicated space for your carry on with comfort plus with delta. They moved my carry on luggage (3) compartments back and put in bags for other passengers that should have gone under their respective seats. When deboarding the plane, there was no help from anyone to retrieve my luggage back several rows. Delta is turning into pure garbage.
JetBlue
7.2
Good
2,900 reviews
Delta
7.9
Good
8,208 reviews

Crew

8.5

Entertainment

7.8

Boarding

8.1

Comfort

7.9

Food

7.2

Overall

7.9

Reviews

1 / 20
2.0
Mediocre

Joseph,Aug 2023

MSP - MCO

Even if you have delta comfort plus, they will move your overhead bag. One of the perks for upgrading is that you have dedicated space for your carry on with comfort plus with delta. They moved my carry on luggage (3) compartments back and put in bags for other passengers that should have gone under their respective seats. When deboarding the plane, there was no help from anyone to retrieve my luggage back several rows. Delta is turning into pure garbage.
Frontier
5.7
Fair
3,048 reviews
Delta
7.9
Good
8,208 reviews

Crew

8.5

Entertainment

7.8

Boarding

8.1

Comfort

7.9

Food

7.2

Overall

7.9

Reviews

1 / 20
2.0
Mediocre

Joseph,Aug 2023

MSP - MCO

Even if you have delta comfort plus, they will move your overhead bag. One of the perks for upgrading is that you have dedicated space for your carry on with comfort plus with delta. They moved my carry on luggage (3) compartments back and put in bags for other passengers that should have gone under their respective seats. When deboarding the plane, there was no help from anyone to retrieve my luggage back several rows. Delta is turning into pure garbage.

Related info for your journey

Find useful and relevant information for your journey from San Francisco 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 Francisco to Key Largo?

    If you book a flight to Key Largo from San Francisco, you will be flying from San Francisco, which is the city’s only airport. San Francisco (SFO) is located 11.8 mi from the center of San Francisco. There are 22 flights from San Francisco to Key Largo per day from 7 different airlines.

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

    Within the past month, 39 users have taken a look at flights from San Francisco to Key Largo.

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

    Airlines like United Airlines, Delta, and Southwest fly from San Francisco to Key Largo in about 8h 18m. The time it takes to get you to your destination can typically vary by up to 1h 56m. Airlines will cover a distance of 2579 mi. This flight may include one or multiple stops.

  • What are the cheapest airlines to fly from San Francisco to Key Largo one-way?

    The cheapest airline one-way is Frontier, with whom users have recently found tickets for as low as $75. However, be on the lookout for offers from Alaska Airlines and Southwest, as they are both options that can get you from San Francisco to Key Largo for a low price.

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

    Before booking your flight to Key Largo from San Francisco, check out the most reliable airlines to get you to your destination on time: Iberia (94%), Finnair (92%), British Airways( 92%).

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

    While on average a flight from San Francisco to Key Largo is generally $1,326, our data shows the cheapest flight currently is $104. When looking at the most popular route, (San Francisco - Miami), you can expect to pay $191 for that flight.

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

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

  • How can I find direct flights from San Francisco 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 Francisco to Key Largo.

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

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

    Currently, May is the cheapest month in which you can book a flight from San Francisco to Key Largo (average of $98). Flying from San Francisco to Key Largo in February is currently the most expensive (average of $183). 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 7 airlines flying from San Francisco to Key Largo

Discover the top 7 airlines that operate flights from San Francisco 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 February 18, 2026.
AirlineCheapestAverageFlexibilityOn-time
FrontierCheapest$92Average$218FlexibilityNo cancel feeOn-time62%
Alaska AirlinesCheapest$118Average$251FlexibilityNo cancel feeOn-time75%
DeltaCheapest$128Average$366FlexibilityNo cancel feeOn-timeN/A
JetBlueCheapest$148Average$355FlexibilityNo cancel feeOn-time62%
United AirlinesCheapest$179Average$459FlexibilityNo cancel feeOn-time69%
American AirlinesCheapest$182Average$392FlexibilityNo cancel feeOn-time71%
SouthwestCheapest$187Average$410FlexibilityNo cancel feeOn-time63%

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