St. Thomas to San Juan Flight Distance
Cyril E. King Airport (STT) to Luis Munoz Marin International Airport (SJU)
Primary sources · 6
- [1] Vincenty (1975) — Direct and Inverse Solutions of Geodesics on the Ellipsoid — the iterative formula used for distance · Survey Review XXIII (176), pp. 88–93 · April 1975 https://www.ngs.noaa.gov/PUBS_LIB/inverse.pdf
- [2] NGA.STND.0036_1.0.0_WGS84 — WGS-84 reference ellipsoid (a = 6,378,137 m, 1/f = 298.257223563) · NGA Standard · July 2014 https://earth-info.nga.mil/index.php?dir=wgs84&action=wgs84
- [3] DESNZ 2024 conversion factors — Per-km kg CO₂e factors for the three distance bands and four cabin classes · UK Department for Energy Security and Net Zero · June 2024 https://www.gov.uk/government/publications/greenhouse-gas-reporting-conversion-factors-2024
- [4] Lee et al. (2021) — Effective radiative forcing of aviation — the science behind the 1.9 × CO₂ → CO₂e uplift · Atmospheric Environment 244, 117834 · January 2021 https://doi.org/10.1016/j.atmosenv.2020.117834
- [5] OpenFlights — Airport coordinates and IATA codes · openflights.org/data.php · Community-maintained https://openflights.org/data.php
- [6] Sack (2010) — Jet-lag review — clinical chronobiology and asymmetric recovery rates · New England Journal of Medicine 362:440 · February 2010 https://www.nejm.org/doi/full/10.1056/NEJMcp0909838
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Your Route Summary
What This Means For Your Trip
Flight Duration: At 68 miles, this short-haul flight will take approximately 0h 38m. This is a relatively quick flight where you may not even need entertainment.
Time Adjustment: San Juan is 0 hours ahead of St. Thomas. You should experience minimal jet lag.
Environmental Impact: An economy class seat produces approximately 28 kg of CO2. This is relatively low for air travel.
Flight Options: 4 airlines serve this route, giving you options for schedule and price comparison.
Complete Flight Analysis
| Metric | Value | Category / Reference |
|---|---|---|
| Distance (Miles) | 68 mi | Primary frequent flyer unit |
| Distance (Kilometers) | 109 km | International standard |
| Distance (Nautical Miles) | 59 nm | Aviation standard |
| Flight Time | 0h 38m | Based on 850 km/h cruise + ground time |
| Route Classification | SHORT HAUL | Short-haul flight (under 1,500 km) |
| Flight Direction | 276° W | West |
| Cruising Altitude | 25,000 ft | FL250 (7,620 m) |
| Time Difference | +0h | Jet lag: none |
| CO2 (Economy) | 28 kg | DEFRA 2024 factors |
| CO2 (Business) | 81 kg | 2.9x economy |
| CO2 (First Class) | 111 kg | 4x economy |
| Trees to Offset | 3 | Economy class, per passenger |
| Fuel per Passenger | 3 L | ~540 L total (180 pax) |
| Operating Airlines | 4 | Direct flights available |
Tips for This Route
Cyril E. King Airport
St. Thomas, Virgin Islands
Luis Munoz Marin International Airport
San Juan, Puerto Rico
Airlines Flying This Route
4 airlines operate flights between St. Thomas and San Juan.
Flight Details
Flight Midpoint
The geographic midpoint of this flight is located at:
Carbon Emissions by Cabin Class
CO2 emissions vary by cabin class due to seat space allocation. Based on DEFRA 2024 emission factors.
Jet Lag & Travel Tips
- Minimal time difference - jet lag unlikely
Seat Recommendations
Distance in Perspective
Distance & Speed Reference
| Measurement | Value |
|---|---|
| Statute Miles | 68 mi |
| Kilometers | 109 km |
| Nautical Miles | 59 nm |
| Meters | 109,000 m |
| Feet | 359,040 ft |
| Flight Time (850 km/h) | 0h 38m |
| Driving Time (80 km/h avg) | 1 hours |
Travel Speed Comparison
How long would it take to cover the 109 km between St. Thomas and San Juan at different speeds?
| Mode | Speed | Time |
|---|---|---|
| Commercial Jet | 850 km/h | 0h 38m |
| Turboprop Aircraft | 500 km/h | 0h 13m |
| Bullet Train | 320 km/h | 0h 20m |
| Car (highway) | 100 km/h | 1h 5m |
| Walking | 5 km/h | 22h (1 days) |
| Speed of Sound | 1,235 km/h | 0h 5m |
Round Trip Summary
Quick Facts
Routes from STT
View all routesFrequently Asked Questions
How far is St. Thomas from San Juan?
The flight distance from Cyril E. King Airport (STT) to Luis Munoz Marin International Airport (SJU) is 68 miles (109 km). This is the great circle distance calculated using the Vincenty formula.
How long is the flight?
A direct flight takes approximately 0h 38m. This is a short-haul flight typically cruising at 25,000 feet (FL250).
What is the time difference?
San Juan is 0 hours ahead of St. Thomas.
What airlines fly this route?
4 airlines operate this route: Cape Air, JetBlue Airways, Seaborne Airlines and 1 more.
What is the carbon footprint?
Economy class: 28 kg CO2 per passenger. Business class: 81 kg. First class: 111 kg. Offset with ~3 trees.
Which seat side is best?
For this West flight, the right side offers the best views away from sun glare.
Can I drive from St. Thomas to San Juan instead of flying?
Driving is a practical alternative at only 109 km. It would take approximately 1 hours at average highway speed. For shorter distances like this, driving can be more convenient when factoring in airport check-in time.
What aircraft typically fly this route?
This short-haul route is typically served by Airbus A320, Boeing 737, Embraer E190 aircraft. These are narrow-body aircraft designed for efficient short-distance travel.
How can I offset the carbon from this flight?
An economy class seat on this route produces 28 kg CO2. You can offset this by planting approximately 3 trees, purchasing verified carbon credits through programs like Gold Standard or Verra, or supporting renewable energy projects. Many airlines also offer built-in carbon offset options during booking.
External Resources & References
Learn more about the airports, aviation data, and carbon emissions methodology used in this calculation.