San Juan (SJU) → St. Thomas (STT)
A reference for the Luis Munoz Marin International Airport to Cyril E. King Airport route. You'll find the operators on file, the great-circle geometry, the connecting options if no nonstop fits your dates, and a short profile of each endpoint airport.
The flight from San Juan (SJU) to St. Thomas (STT) covers a great-circle distance of roughly 109 km (68 miles). Aircraft leave Luis Munoz Marin International Airport on an initial east heading. As international sectors go, this one sits in the short-haul bracket: long enough that most carriers run it as its own dedicated rotation, but short enough to fit inside a single crew duty period.
3 carriers file a direct SJU to STT sector, with Cape Air and JetBlue Airways among the operators on record. A route attracting this many carriers usually points to a city pair with both leisure and business demand, or a competitive hub-to-hub link where the airline alliances overlap on the same metal.
Operators on the SJU → STT direction
Carriers with at least one scheduled rotation on this sector in the OpenFlights dataset, ranked by the number of code-shared filings.
| IATA | Airline | Country | Callsign |
|---|---|---|---|
| 9K | Cape Air | United States | CAIR |
| B6 | JetBlue Airways | United States | JETBLUE |
| BB | Seaborne Airlines | United States | SEABORNE |
At well under 1,500 km this is a regional sector. Carriers typically run narrow-body aircraft from the Airbus A320 family or the Boeing 737 series, with regional jets (Embraer E-Jet, CRJ) showing up on lower-frequency rotations. Block time runs around 52m. Expect a single-aisle cabin and no real meal service. A snack and a drink is usually all you get.
If a nonstop doesn't match your dates, Atlanta (ATL), Chicago (ORD), and New York (JFK) show up on both ends of the network and make the most natural connecting points. The connecting-hubs grid below extends that list to the eight strongest options, ranked by each airport's overall departure activity. That ranking is a fast proxy for how many onward flights a single stop is likely to feed.
Connecting hubs
Airports that already appear on both ends of this network. They're the natural one-stop options when no nonstop matches your dates, ranked by overall departure activity.
This is an international sector between Puerto Rico and Virgin Islands. Build in time for passport validity, possible visa requirements, and the time-zone gap between San Juan and St. Thomas. International itineraries are quoted in local time at each end, so a "midnight" departure in San Juan typically lands the next morning in St. Thomas. Customs clearance happens on first arrival in the destination country.
On the day of operation, the SJU to STT direction lifts off heading east, then the great-circle track curves to compensate for the Earth's rotation. The return STT to SJU sector heads west out of the gate, with 4 operators on file for the inbound side. Combine the two operator lists for a full picture of the city pair's competitive landscape.
BTS domestic traffic (SJU → STT, 2025)
Real 2025 passenger, freight, and departure-frequency totals for this exact non-stop segment, from the U.S. Bureau of Transportation Statistics T-100 Domestic Segment (All Carriers) database — not an OpenFlights field. Scheduled-passenger service (BTS service class F) only; all-cargo and non-scheduled service are excluded.
| Carrier code | Carrier (BTS record) | Passengers | Departures performed |
|---|---|---|---|
| B6 | JetBlue Airways | 41,470 | 351 |
| 9K | Hyannis Air Service, Inc. dba Cape Air | 17,301 | 3,501 |
| 3M | Silver Airways | 8,017 | 314 |
| F9 | Frontier Airlines Inc. | 6,660 | 61 |
| AA | American Airlines Inc. | 1,132 | 8 |
| NK | Spirit Air Lines | 621 | 5 |
| DL | Delta Air Lines Inc. | 552 | 4 |
| UA | United Air Lines Inc. | 60 | 1 |
| 04Q | Tradewind Aviation | 2 | 1 |
| F4 | Air Charter, Inc d/b/a Air Flamenco | 0 | 17 |
Aircraft types flown on this segment in 2025, by departures performed: Cessna C-402/402A/402B (3,501 departures), Airbus Industrie A320-100/200 (353 departures), Aerospatiale/Aeritalia ATR-42 (314 departures), Airbus Industrie A320-200n (59 departures), Shorts 360 (7 departures), Boeing B737 Max 800 (6 departures), Pilatus Britten-Norman BN2/A Islander (6 departures), Pilatus Britten-Norman BN2A Trislander (4 departures) and 5 other aircraft type(s). Mail carried: 0 lb. Departures scheduled vs. performed: 4,306 scheduled, 4,263 performed.
Data as of: full calendar year 2025 (all 12 months) · Source: BTS T-100 Domestic Segment (All Carriers), U.S. DOT Bureau of Transportation Statistics (public domain, U.S. government work). Carrier names and aircraft-type descriptions are BTS's own record values, not this site's. Figures reflect carrier-filed BTS reports, not real-time bookings. See the BTS domestic traffic hub and methodology for match coverage and corrections path.
Endpoints
Other routes from San Juan (SJU)
Other destinations served from the same origin. Handy for combining trips or for finding an alternate first leg.
Other routes into St. Thomas (STT)
Other origins that already file scheduled service into the destination airport.
Reading this route page
The operator list reflects scheduled-route filings in the OpenFlights dataset, not real-time availability. A carrier appearing here publishes a scheduled service on this sector. It isn't a live timetable, and the actual flight numbers, frequencies, and aircraft types shift season to season. For booking and current schedules, cross-reference the airline page above with the carrier's own website.
Distance here is the great-circle arc between the two airports' published coordinates. Real flight tracks wander off that line because of wind, ATC routings, oceanic crossings, and political airspace constraints. Block time is an estimate covering ground taxi, climb, cruise at typical jet speeds, and descent. Real block times shift with aircraft type, weather, and traffic, so treat the stat-strip number as a planning indicator rather than a published flight time.