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GSI to UNI: distance & flight time
Grand-Santi (Grand-Santi Airport) → Union Island (Union Island International Airport)
749 mi
1,205 km · 651 nm
2h 6m
estimated nonstop flight time
-1h
time difference · heading northwest
See live GSI→UNI fares Phone-only fares on this route — call free
Flight time details
749 miles nonstop takes roughly 2h 6m gate to gate, flying northwest. Add 45–90 minutes per connection if there's no nonstop service. Remember to factor the 1-hour time set-back when reading arrival times on your ticket.
The two airports
- GSI — Grand-Santi Airport · Grand-Santi, French Guiana
- UNI — Union Island International Airport · Union Island, Saint Vincent and the Grenadines
Distances are great-circle ("as the crow flies") — the same basis airlines use for frequent-flyer miles.
Alternate airports can cut this fare
Flying from or into a nearby airport is the #1 trick our agents use to beat online prices. Call and we'll compare every combination on one call.
Near GSI
- SMZ · Stoelmanseiland Airport5 mi away
- DRJ · Drietabbetje Airport24 mi away
- MPY · Maripasoula Airport49 mi away
- LDX · Saint-Laurent-du-Maroni Airport86 mi away
Near UNI
- CIW · Canouan Airport8 mi away
- MQS · Mustique Airport25 mi away
- BQU · J F Mitchell Airport29 mi away
- SVD · Argyle International Airport42 mi away
Frequently asked questions
How far is GSI from UNI?
The flight distance from Grand-Santi (GSI) to Union Island (UNI) is 749 miles (1,205 km, 651 nautical miles), measured along the great-circle route airlines actually fly.
How long is the flight from GSI to UNI?
A nonstop flight takes about 2h 6m gate to gate. Actual time varies with winds, routing and season — eastbound transatlantic flights, for example, are usually faster than the return.
Are there nonstop flights from GSI to UNI?
Nonstop service on GSI–UNI depends on the season and the day of week. Run the fare search on this page with the nonstop filter applied to see current direct options; when there is no nonstop, a single connection through a carrier hub adds roughly 2–4 hours to the 2h 6m nonstop estimate.
What is the time difference between Grand-Santi and Union Island?
Union Island is 1 hour behind Grand-Santi.
What is the cheapest way to fly from GSI to UNI?
Compare live fares online, then call CheapoTrav — our agents have unpublished consolidator fares on GSI–UNI that never appear on search engines, with no booking fees.
Why are some GSI to UNI fares phone-only?
Consolidator contracts let us sell certain GSI–UNI tickets below the price airlines permit us to publish online, so those fares can only be quoted over the phone. Call the travel desk and an agent will check phone-only inventory for your dates.