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Key Largo

$87+ Cheap flights from San Diego (SAN) 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 8/18. Fares are subject to change and may not be available on all flights or dates of travel.
SAN — MIA
Aug 3 — Aug 101
Sun 8/3
Sun 8/10
1 adult, Economy
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Cheapflights Tip: The best prices from San Diego to Key Largo are usually found in September or August, booked 44 days in advance, depart on a Wednesday or Thursday and return on a Wednesday

Cheap flight deals from San Diego to Key Largo

Keep the following information in mind while searching for San Diego to Key Largo flight deals. Data was last updated July 29, 2025.

Round-trip from

$217
(CheapOair)

One-way from

$87
(CheapOair)

Popular in

December

Cheapest in

September

Average price

$458
From San Diego to Key Largo
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One-way flight from San Diego to Key Largo
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Highest demand for flights based on searches. 5% potential increase in price ($24 potential increase over avg. RT price).
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Cheapest flight prices on average. 1% potential price decrease ($8 potential savings vs. average RT price).
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Average for round-trip flights in July 2025
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Find flight deals from San Diego to Key Largo

Cheapest flights from San Diego to Key Largo
Explore the most affordable flight options available from San Diego to Key Largo. Find the lowest fares from popular airlines and budget airlines, with prices last updated on July 29, 2025.

This Kiwi.com deal was found by Cheapflights users on 7/28. 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 7/307:04 pmSAN - MIA
1 stop7h 41mMultiple Airlines
Mon 8/117:00 amMIA - SAN
1 stop13h 55mMultiple Airlines
Deal found 7/28$214
This CheapOair deal was found by Cheapflights users on 7/28. 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.
Sun 9/218:25 amSAN - MIA
1 stop7h 23mSpirit Airlines
Wed 9/247:20 pmMIA - SAN
1 stop15h 09mSpirit Airlines
Deal found 7/28$217
This Frontier deal was found by Cheapflights users on 7/27. 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 8/3012:12 pmSAN - MIA
1 stop15h 18mFrontier
Sat 9/66:45 amMIA - SAN
1 stop18h 39mFrontier
Deal found 7/27$259

Cheapflights Fare Finder

 
Customize your flight search to find flights from San Diego 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 July 29, 2025.
Use the filters below to find and compare flights from San Diego to Key Largo that are best for you.

Fly from

San Diego

Fly to

Key Largo

Route

Depart

Return

Price

San DiegoMiami

SAN - MIA

SANMIA

San Diego

Sun 9/21

8:25 am-6:48 pm

1 stop7h 23m

Miami

Wed 9/24

7:20 pm-7:29 am

1 stop15h 09m

$217

San DiegoMiami

SAN - MIA

SANMIA

San Diego

Sat 8/2

12:05 pm-6:30 am

1 stop15h 25m

Miami

Mon 8/11

7:00 am-5:55 pm

1 stop13h 55m

$219

San DiegoMiami

SAN - MIA

SANMIA

San Diego

Sat 8/30

12:12 pm-6:30 am

1 stop15h 18m

Miami

Sat 9/6

6:45 am-10:24 pm

1 stop18h 39m

$259

San DiegoMiami

SAN - MIA

SANMIA

San Diego

Mon 8/18

6:15 am-7:23 pm

1 stop10h 08m

$87

San DiegoMiami

SAN - MIA

SANMIA

San Diego

Wed 8/13

7:04 pm-5:45 am

1 stop7h 41m

$122

San DiegoMiami

SAN - MIA

SANMIA

San Diego

Wed 9/10

10:45 pm-6:44 am

Nonstop4h 59m

$159

Flights are sorted by cheapest round-trip flights first.

Deals found on 7/29

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

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

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

Use this chart to determine the optimal time to book a round-trip flight from San Diego to Key Largo. Price data was last updated on July 25, 2025.

Booking 44 days in advance of your planned departure date is, on average, the best time to get cheap flights from San Diego to Key Largo. 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 San Diego to Key Largo?

Currently, September is the cheapest month in which you can book a flight from San Diego to Key Largo (average of $232). Flying from San Diego 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 SAN to KE9?

Find hourly flight availability from San Diego 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 July 29, 2025.

Regardless of the time of day you decide to fly, the ticket price will remain around the same. Book flights from San Diego to Key Largo as you normally would.

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

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

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

Weekly flight availability from San Diego to Key Largo

Explore weekly flight availability from San Diego 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 July 29, 2025.

The most flights from SAN to KE9 are scheduled on a Monday (4 on average). You will have fewer flight options on Saturday, which is when the least amount of flights are scheduled (2 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 July 29, 2025.
See what other customers who have flown with American Airlines, Spirit Airlines, and Frontier from San Diego to Key Largo have to say. You can also see how each airline compares in terms of entertainment options, comfort, food, crew/service, and boarding process.
American Airlines
7.2
Good
10,000 reviews

Food

6.5

Crew

8.0

Boarding

7.5

Overall

7.2

Entertainment

6.9

Comfort

7.2

Reviews

1 / 20
2.0
Mediocre

Andrew,May 2025

LAX - MIA

2 hour delay. Discovered an engine problem late, we boarded the plane and they asked us to come off. To add insult to injury nothing was given to passengers to make amends. No free drink. No extra food or snacks. No free WiFi. Gimme a break
American Airlines
7.2
Good
10,000 reviews
American Airlines
7.2
Good
10,000 reviews

Food

6.5

Crew

8.0

Boarding

7.5

Overall

7.2

Entertainment

6.9

Comfort

7.2

Reviews

1 / 20
2.0
Mediocre

Andrew,May 2025

LAX - MIA

2 hour delay. Discovered an engine problem late, we boarded the plane and they asked us to come off. To add insult to injury nothing was given to passengers to make amends. No free drink. No extra food or snacks. No free WiFi. Gimme a break
Spirit Airlines
6.3
Okay
8,040 reviews
American Airlines
7.2
Good
10,000 reviews

Food

6.5

Crew

8.0

Boarding

7.5

Overall

7.2

Entertainment

6.9

Comfort

7.2

Reviews

1 / 20
2.0
Mediocre

Andrew,May 2025

LAX - MIA

2 hour delay. Discovered an engine problem late, we boarded the plane and they asked us to come off. To add insult to injury nothing was given to passengers to make amends. No free drink. No extra food or snacks. No free WiFi. Gimme a break
Frontier
5.9
Fair
3,238 reviews
American Airlines
7.2
Good
10,000 reviews

Food

6.5

Crew

8.0

Boarding

7.5

Overall

7.2

Entertainment

6.9

Comfort

7.2

Reviews

1 / 20
2.0
Mediocre

Andrew,May 2025

LAX - MIA

2 hour delay. Discovered an engine problem late, we boarded the plane and they asked us to come off. To add insult to injury nothing was given to passengers to make amends. No free drink. No extra food or snacks. No free WiFi. Gimme a break

Related info for your journey

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

    San Diego (SAN), located 2.6 mi from the city center, is the airport you fly out of when you book flights from San Diego to Key Largo. 9 airlines have flights from San Diego to Key Largo on a regular basis. Booking flights from San Diego to Key Largo should not be difficult; the airport handles an average of 3 outbound flights to Key Largo per day.

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

    The San Diego to Key Largo flight path was viewed by 12 users in the past month. Keep an eye out for changes in search interest prior to high and low season.

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

    To fly one-way, consider booking your trip with Spirit Airlines, which is currently one of the cheapest options available, starting at $87. Frontier flights start at $122 while deals on American Airlines start at $159 one-way.

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

    Before booking your flight to Key Largo from San Diego, check out the most reliable airlines to get you to your destination on time: American Airlines (80%), Alaska Airlines (80%), GOL( 78%).

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

    The cheapest flight price from San Diego to Key Largo is $203. On average you can expect to pay $1,486. The most popular route, (San Diego - Miami), can usually be booked for $161.

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

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

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

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

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

    Currently, September is the cheapest month in which you can book a flight from San Diego to Key Largo (average of $232). Flying from San Diego 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.

See more FAQs

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Top 9 airlines flying from San Diego to Key Largo

Discover the top 9 airlines that operate flights from San Diego 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 July 29, 2025.
AirlineCheapestAverageFlexibilityOn-time
FrontierCheapest$89Average$196FlexibilityNo cancel feeOn-time62%
Spirit AirlinesCheapest$97Average$206FlexibilityNo cancel feeOn-time65%
JetBlueCheapest$166Average$389FlexibilityNo cancel feeOn-time62%
American AirlinesCheapest$205Average$449FlexibilityNo cancel feeOn-time71%
Alaska AirlinesCheapest$239Average$519FlexibilityNo cancel feeOn-time75%
United AirlinesCheapest$242Average$429FlexibilityNo cancel feeOn-time69%
DeltaCheapest$248Average$383FlexibilityNo cancel feeOn-timeN/A
Hawaiian AirlinesCheapest$267Average$388FlexibilityNo cancel feeOn-time85%
SouthwestCheapest$277Average$498FlexibilityNo cancel feeOn-time63%

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