The Budget Carrier Appeal
When a Spirit or Frontier fare to STT pops up at $89 or $119, it's hard not to look twice. Budget carriers have made real inroads into Caribbean routes, and St. Thomas is no exception. But the advertised price is rarely the whole story.
What the Base Fare Doesn't Include
Both Spirit and Frontier charge for carry-on bags, checked bags, seat selection, and in some cases even printing your boarding pass at the airport. A round-trip ticket that appears to cost $180 can easily become $340 once you add a carry-on each way and a seat assignment so you're not separated from your travel companion.
Before booking, use each airline's fee calculator to build your real total. Compare that number — not the base fare — against what JetBlue, American, or Delta are offering.
Route Availability
Spirit operates seasonal service to STT from select markets. Frontier's STT presence is more limited. Neither carrier maintains the frequency or year-round consistency of the majors on this route, which means fewer options if your flight is cancelled or significantly delayed.
When Budget Carriers Make Sense for STT
If you're traveling with a personal item only, no seat preference, and maximum schedule flexibility — a budget carrier can genuinely save you money. Solo travelers with a small backpack and flexible travel dates are the ideal budget carrier passenger.
Families, travelers with checked luggage, or anyone with a tight connection should do the full fee math carefully before committing.
The Reliability Factor
On a Caribbean route, schedule reliability matters more than on a domestic hop. A cancelled morning Spirit flight to STT may not have another option until the next day, whereas the majors typically have multiple daily or weekly options to rebook onto. Factor that risk into your decision.