Most major airlines have put flights to Germany, Spain, Finland, or Switzerland on sale today with a price range between $506-$594. Flight dates are mostly between September and April of next year. Smaller airports will have more stops or worse routing than major airports.
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Delta and United have round-trip flights from San Antonio or Austin (SAT/AUS) to Key West (EYW) for $235 with a connection. Flights September to November. No Thursday departures. Extended weekends available.
JetBlue has round-trip flights from Austin (AUS) to Aruba (AUA) for $352-$366 with a connection. Flights August to September. Departures on Monday, Friday, and Sunday. Very few extended weekends available. Origin/Destination reversible.
JetBlue has round-trip flights from Austin (AUS) to Sint Maarten (SXM) for $283-$286 with a connection. Flights August to September. Departures on Saturday only. Origin/Destination reversible. 7-day minimum stay required.
American Airlines, Delta, or Air Canada has round-trip flights from Austin (AUS) to Toronto (YYZ) for $256-$279 with a connection. Flights September to March. Weekends available. Origin/Destination reversible.

Cheap Flights: Austin to/from Cancun $263-$280 r/t [August-November] – Aeromexico / Delta / American
American, Aeromexico, and Delta have round-trip flights from Austin (AUS) to Cancun (CUN) for $263-$280, NONSTOP or with a connection. Flights August to November. Extended weekends available. Origin/Destination reversible.
Flights on American are NONSTOP for $280. Delta and Aeromexico are cheaper, but have a connection.
Aeromexico has round-trip flights from San Antonio (SAT) to Mexico City (MEX) for $224-$234, NONSTOP. Flights September to November. No Sunday departures. Weekends available. Origin/Destination reversible.
Delta is offering flights from Austin or San Antonio (AUS/SAT) to London, Paris, Amsterdam, Madrid, and possibly other destinations in Europe starting at 34,000 SkyMiles for San Antonio to 44,000 SkyMiles for Austin, with a connection. Flights are from September to November. Use the Delta fare calendar (links) to pull up the deal on Delta’s site.
United has round-trip flights from Austin or San Antonio (AUS, SAT) to San Jose or Liberia, Costa Rica (SJO, LIR) for $306-$323 with a connection. Flights August to November. Weekends available.
Spirit has round-trip flights from Austin (AUS) to San Jose, Costa Rica (SJO) for $189-$214 with a connection. Flights in September. Departures on Monday and Thursday. Extended weekends available. Origin/Destination reversible.
Note: Spirit fares do not include a free carry-on bag. Only a small personal item, like a Jansport City Scout backpack is free. You can avoid paying for seat selection if you accept the randomly assigned seat prior to boarding.
Note: Spirit seats only have 28-inches of pitch; 2-to-3 inches less space than most other airlines.
United has round-trip flights from Austin (AUS) to Nashville (BNA) for $135 with a connection. Flights August to December. Very few weekends available. Origin/Destination reversible.
Delta has round-trip flights from San Antonio (SAT) to Nashville (BNA) for $155 with a connection. Flights August to March. Weekends available. Origin/Destination reversible.