Guernsey is the easiest of the Bailiwick's islands to reach directly, with regular flights and ferries from the UK and France. Getting to the other three inhabited islands in the Bailiwick — Alderney, Sark, and Herm — means a second leg from Guernsey itself, and each one uses a different combination of ferry and flight worth knowing before you build a multi-island itinerary.
Flying into Guernsey
Aurigny, Guernsey's main airline, operates direct flights from a wide range of UK airports — including London Gatwick, London City, Birmingham, Manchester, Bristol, East Midlands, Edinburgh, Southampton, and Exeter — plus routes to Dublin and Paris, with flights taking as little as 40 minutes from the nearest UK points. British Airways also runs a daily direct service from London Heathrow Terminal 5, and seasonal charter operators add further European connections, including from Switzerland, the Netherlands, and Germany during parts of the year.
Arriving by sea
Condor Ferries connects Guernsey to Poole and Portsmouth on the English south coast, and to St Malo in Brittany, France, giving a genuine option for combining a Channel Islands trip with mainland France or bringing a vehicle over for a longer stay. Guernsey to Jersey is also a regular Condor route if you're combining a Jersey visit with the two larger islands in one trip.
Getting to Alderney
Alderney is reachable from Guernsey two ways: Aurigny operates year-round daily flights, making air the more dependable year-round option, while Alderney Ferry Services runs a daily seasonal ferry between Guernsey and Alderney from March through October. Outside that ferry season, flying is effectively the only practical option.
Getting to Sark
The Isle of Sark Shipping Company runs a year-round ferry service between Guernsey and Sark, with multiple sailings most days, making Sark realistically doable as a day trip from Guernsey as well as an overnight stay. A smaller operator, Sark Boat Charters, offers additional chartered crossings. Once you land, remember Sark has no cars — see this guide's companion piece on the Bailiwick's structure for what that means for getting around once you're there.
Getting to Herm
Herm is the closest and quickest inter-island trip from Guernsey: Travel Trident operates a year-round service from St Peter Port Harbour, short enough that Herm functions as an easy half-day or full-day excursion rather than requiring an overnight stay for most visitors.
Putting a multi-island trip together
Weather and sea conditions affect the smaller crossings more
Sark, Herm, and to a lesser extent Alderney are all reached by relatively small vessels crossing open Channel water, and sea conditions affect these routes more noticeably than they would a larger ferry on the Guernsey–Poole or Guernsey–St Malo crossings. Rough weather can delay or cancel sailings to Sark and Herm on a given day, particularly outside the calmer summer months, so a tightly scheduled day trip in shoulder-season weather carries more risk of disruption than the same trip planned for peak summer.
Combining islands in one trip
A common pattern for a longer Channel Islands visit is to base yourself in Saint Peter Port and take separate day trips out to Herm and Sark, since both are close enough for a there-and-back visit without needing to change accommodation. Alderney, being further and requiring more transport planning, suits an overnight stay better than a rushed day trip, particularly if your visit falls outside the seasonal ferry window and depends on a single daily Aurigny flight each way.
Booking through Guernsey versus booking each leg separately
For a trip that includes more than one of the smaller islands, it's usually simpler to book your Guernsey flight or ferry first, arrive and settle in, then book each inter-island leg locally or a day or two ahead once you have a clearer sense of the weather and your own schedule, rather than trying to lock in every crossing from home months in advance. The exception is Alderney outside its ferry season, where Aurigny's limited daily flight frequency makes early booking more useful, and peak summer weeks generally, when demand for all inter-island ferries rises and last-minute space can be tighter than in the shoulder season.
Before you commit to an inter-island day trip
Check the current season's sailing frequency for whichever island you're visiting — Alderney's ferry runs only part of the year, while Sark and Herm operate closer to year-round — and build in a realistic return-time margin, particularly for Alderney, where a missed evening flight or ferry has fewer same-day alternatives than a short Herm crossing would.