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Live fares to Union Island load the moment you search. In the meantime, here is what to know about flying to Union Island from London.
Average daytime temperature and monthly rainfall across the year, so you can pick the best time to fly. Source: long-term climate normals.
Average temperature (°C)
Average rainfall (mm)
Fares shown are indicative estimates. Search for live prices and availability to Union Island.
Search live faresThursday
Partly cloudy
29°C
15/10/2026
Friday
Light rain
29°C
16/10/2026
Saturday
Thunderstorm
29°C
17/10/2026
Sunday
Drizzle
29°C
18/10/2026
Monday
Drizzle
29°C
19/10/2026
Tuesday
Drizzle
29°C
20/10/2026
Wednesday
Overcast
29°C
21/10/2026
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Union Island is the sailing capital of the Grenadines, a rugged, volcanic speck of Saint Vincent and the Grenadines that punches well above its weight for scenery. Think jagged green peaks tumbling into turquoise water, the famous Tobago Cays just a short boat ride away, and a laid-back harbour town, Clifton, that still feels wonderfully undiscovered. For UK travellers, flights to Union Island involve a scheduled flight to a regional hub followed by a short inter-island hop, and the reward at the other end is one of the most beautiful corners of the Caribbean.
The dry season, roughly mid-December to April, brings the most reliable sunshine and calmer seas, making it the most popular (and busiest) time to book flights to Union Island. May and November are excellent shoulder months, with fewer crowds and good weather. The Atlantic hurricane season runs June to November, peaking August to October, so if you're travelling then keep an eye on forecasts and consider travel insurance. Use the When to book chart above to see how fares typically move across the year.
There are no direct flights from the UK to Union Island. The usual route is a long-haul flight from London to Barbados (Grantley Adams International) with British Airways or Virgin Atlantic, taking around 8 to 8.5 hours, or via Grenada with British Airways. From there, regional carriers such as SVG Air, Mustique Airways or Grenadine Air Alliance operate short hops of 30 to 60 minutes to Union Island International Airport (UNI). Some travellers instead connect through St Vincent's Argyle International Airport before continuing by air or ferry. Allow a reasonable connection window, as inter-island schedules can be tight.
Union Island is compact but full of highlights, from world-class sailing waters to quiet, unspoilt beaches.
UNI sits right on the edge of Clifton, the main town, so it's one of the most convenient airports in the Caribbean — town, the harbour and most guesthouses are within a five to ten minute walk or a very short taxi ride. Onward travel to other Grenadine islands, including Mayreau, Canouan and the Tobago Cays, is usually by boat from Clifton harbour.
UK passport holders do not need a visa for short tourist stays in Saint Vincent and the Grenadines, though your passport should be valid for the duration of your trip. The local currency is the Eastern Caribbean Dollar (XCD), and while some businesses accept US dollars, it's worth carrying local currency for smaller purchases; card payments can be limited outside Clifton. No special vaccinations are required for UK travellers, but it's sensible to check the latest NHS travel health advice and take out comprehensive travel insurance before you fly.
Your allowance to Union Island depends on the airline and the fare you book. The table below shows typical long-haul allowances so you know roughly what to expect — always confirm the exact limits with your airline before you fly.
| Fare type | Hand baggage | Checked baggage |
|---|---|---|
| Basic / Light economy | 1 small under-seat bag | Usually none — add for a fee |
| Standard economy | 1 cabin bag + 1 personal item | Typically 1 × 23 kg |
| Premium economy | 1–2 cabin bags + personal item | Typically 2 × 23 kg |
| Business / First | 2 cabin bags + personal item | Typically 2 × 32 kg |
Indicative only. Allowances vary by airline, route and fare — always check your airline's baggage policy.
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