Cheap flights from San Antonio, TX to Key West, FL
Flights starting at £98. Choose between Spirit Airlines, Silver Airways, or Frontier Airlines to find the best price.
Make your travel wishlist, we'll do the rest
Hidden deals
Kiwi-Code uncovers prices airlines don't want you to see.
Effortless booking
Use our flexible filters to tailor your search.
Travel hacking
Look out for the travel hack star icon for even cheaper fares.
Tips to know when travelling to Key West
Cheapest one-way trip | £98 |
---|---|
Cheapest round-trip | £208 |
Average round-trip | £294 |
Includes rare itinerary | |
Most popular airline | Spirit Airlines |
Receive exclusive deals by email
By subscribing you agree to receive offers according to the conditions described in our Privacy Policy.
The most popular airlines for this route are Spirit Airlines, Silver Airways, Frontier Airlines, Allegiant Air, and United Airlines. San Antonio and Key West have 108 direct flights per week.
Check-in for a flight from San Antonio to Key West
Name | Carrier code | IATA Code | Passport needed during booking | Online check-in available |
---|---|---|---|---|
Spirit Airlines | NKS | NK | No | Opens 24 days before flight Closes 1 hours before flight |
Silver Airways | SIL | 3M | No | Opens 24 days before flight Closes 2 hours before flight |
Frontier Airlines | FFT | F9 | No | Opens 24 days before flight Closes 1 hours before flight |
Allegiant Air | AAY | G4 | No | Opens 24 days before flight Closes 1 hours before flight |
United Airlines | UAL | UA | Yes | No |
Weather in Key West
Average Weather
Month | Average monthly max temperature | Average monthly min temperature |
January | 22°C | 20°C |
February | 23°C | 21°C |
March | 23°C | 22°C |
April | 25°C | 24°C |
May | 26°C | 25°C |
June | 28°C | 27°C |
July | 29°C | 28°C |
August | 29°C | 28°C |
September | 29°C | 28°C |
October | 27°C | 26°C |
November | 25°C | 24°C |
December | 24°C | 22°C |
14 day forecast
Frequently asked questions
Planning a trip? Thanks to our Virtual Interlining algorithm, we offer billions of route combinations between any A and any B in the world by plane, train, and bus. Find the cheapest routes and best deals for you, as well as the best dates on which to travel.
Explore alternative trips
Flights from San Antonio
- Flights from San Antonio to London
- Flights from San Antonio to San Juan
- Flights from San Antonio to Denver
- Flights from San Antonio to Phoenix
- Flights from San Antonio to Orlando
- Flights from San Antonio to Guadalajara
- Flights from San Antonio to Mexico City
- Flights from San Antonio to New Orleans
- Flights from San Antonio to León
- Flights from San Antonio to San Francisco
- Flights from San Antonio to Manchester
- Flights from San Antonio to Washington, D.C.
- Flights from San Antonio to Las Vegas
- Flights from San Antonio to Boston
- Flights from San Antonio to Raleigh
- Flights from San Antonio to Chicago
- Flights from San Antonio to Riga
- Flights from San Antonio to Los Angeles
- Flights from San Antonio to Victoria
- Flights from San Antonio to Rhodes
Flights to Key West
- Flights from Atlantic City to Key West
- Flights from Guatemala City to Key West
- Flights from Lima to Key West
- Flights from London to Key West
- Flights from New Orleans to Key West
- Flights from Vilnius to Key West
- Flights from New York to Key West
- Flights from Albany to Key West
- Flights from Prague to Key West
- Flights from Paris to Key West
- Flights from Las Vegas to Key West
- Flights from Denver to Key West
- Flights from Chicago to Key West
- Flights from Miami to Key West
- Flights from Los Angeles to Key West
- Flights from Atlanta to Key West
- Flights from Mexico City to Key West
- Flights from Bogotá to Key West
- Flights from Dallas to Key West
- Flights from Phoenix to Key West
Popular routes
- Flights from Chiang Mai to Bangkok
- Flights from Sarasota to Frankfurt
- Flights from Chittagong to Riyadh
- Flights from Santa Ana to Lahore
- Flights from San José del Cabo to Fresno
- Flights from Barranquilla to Kolkata
- Flights from Cape Town to Nashville
- Flights from Grand Rapids to Zürich
- Flights from Detroit to Pristina
- Flights from Phuket City to Bangkok
- Flights from Phoenix to Boise
- Flights from Asunción to San Andrés