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Milford Sound vs Doubtful Sound

Milford Sound vs Doubtful Sound is the first big choice for any Fiordland trip. Both are fiords in the same national park, both are cruised by boat, and both carry rain, cliffs and wildlife. They differ in size, access, price and crowds. This page compares the two fiords side by side and links to the detailed Milford Sound boat tour pages where you can book. It covers the fiords, the roads, the cruises and which one suits your trip. The bookable tours are compared on Milford Sound boat tours compared.

Rolla Island in Doubtful Sound, the quieter alternative to a Milford Sound boat tour

Rolla Island in Doubtful Sound at the entrance to Deep Cove. Photo: Pseudopanax at English Wikipedia, Public domain, via Wikimedia Commons

Quick answer Milford vs Doubtful

Doubtful Sound is bigger, at 40 km long and up to 421 m deep per Wikipedia, against Milford Sound's 15 km length. Milford Sound is easier to reach by road and cheaper to cruise, with boat-only cruises from $80 per person. Doubtful Sound needs a boat crossing of Lake Manapouri and a coach over Wilmot Pass, and its day cruise starts from NZ$399. Most first-time visitors cruise Milford Sound because the access is simple. Travellers with a spare day and a quiet-fiord wish choose Doubtful.

Key takeaways

Milford and Doubtful Side by Side

The two fiords sit in the same park, Fiordland National Park, which holds 15 fiords including Milford, Doubtful and Dusky Sounds. The table below lines up the published figures for both, from official and operator sources.

The Figures

Milford Sound figures come from Wikipedia and DOC. Doubtful Sound figures come from Wikipedia and RealNZ, the operator that cruises it. Where sources disagree, both figures are shown.

Prices are quoted the way each seller prints them, in US dollars for the Milford tours listed on this site and in NZ dollars for the RealNZ Doubtful Sound cruises as printed on its own pages.

FeatureMilford SoundDoubtful Sound
Length15 km inland from the Tasman Sea40 km long
DepthSources give different figures421 m (Wikipedia), about 430 m (RealNZ)
CliffsRock faces rise 1,200 m or more, Mitre Peak drops sheer to the waterWidespread, less vertical cliffs
Rain6,412 mm a year on average, up to 7 m per DOC3,000 to 6,000 mm a year, about 180 rainy days
Getting there120 km by road from Te Anau, 2 hr 15 min to 2.5 hr of drivingBoat across Lake Manapouri, then a coach over the Wilmot Pass gravel road
Day cruiseFrom $80 per person for the Classic CruiseFrom NZ$399 with RealNZ, 6 hours 45 minutes in total
Overnight cruise$391 per person for 17 hours aboard the Milford MarinerFrom NZ$799, departing noon and returning noon the next day

The Short Answer by Traveller

If you have one day in Fiordland, take Milford Sound. The road goes all the way to the wharf, there are many departures, and the entry price is lower. If you have already seen Milford, or you want quiet water, Doubtful Sound is the stronger choice. RealNZ runs its day cruise on a purpose-built catamaran with upper and lower seating decks. If you want to sleep on the water, both offer it. The Milford Mariner sleeps 64 guests and leaves Milford at 4pm daily. Doubtful has two vessels, the Fiordland Navigator sleeping 52 and the Wanderer sleeping 36, and no day visitors are aboard overnight.

Families on a schedule, cruise-ship passengers on a shore day and anyone driving from Queenstown will find the Milford options far more flexible, including a Coach and Cruise from Queenstown that takes 12 hours. Photographers who want Mitre Peak, which DOC puts at 1,692 m, need Milford Sound. Anyone chasing silence should read the Doubtful section below and budget the extra money and time. This site sells Milford Sound tours only, so the Doubtful prices in this guide are the operator's own figures.

Sources: Wikipedia, DOC, RealNZ

Getting There

Access is the single biggest practical difference between the two fiords. Milford Sound has a sealed road to the wharf. Doubtful Sound has no road access at all.

The Milford Road

Milford Sound sits at the end of SH94, the Milford Road, 120 km from Te Anau. DOC puts the drive at a minimum of 2 hours 15 minutes without stops, and Fiordland tourism suggests allowing 2.5 hours. From Queenstown the trip is 288 km and takes almost four hours, though Southern Discoveries recommends allowing 5 hours with stops. The road is fully sealed but narrow and winding, and it climbs to the Homer Tunnel at 945 m above sea level, a 1.2 km tunnel completed in 1953 where traffic lights in summer can hold you for up to 20 minutes.

Plan the drive properly. There are no fuel stops between Te Anau and Milford Sound, and no mobile phone coverage along the road. Public toilets sit at Te Anau, Knobs Flat and Milford Sound, with Knobs Flat the last flush toilets before the fiord. In winter vehicles must carry or fit snow chains when required, and you can hire chains at any Te Anau petrol station. The road closes an average of 8 days a year, mostly in winter, and avalanche gates at Marian Corner shut whenever there is danger. If you would rather not drive, a Small Group Tour from Queenstown handles the whole day for up to 15 guests at $211.21 per person with a picnic lunch included. The Milford Road guide covers every stop in order.

Lake Manapouri and Wilmot Pass

No road reaches Doubtful Sound. Every trip starts with a drive to Manapouri, about 20 to 30 minutes from Te Anau and 2 hours 45 minutes from Queenstown, then a 45-minute boat crossing of Lake Manapouri to West Arm. Lake Manapouri is 178 m above sea level, up to 444 m deep and dotted with 33 islands. From West Arm a coach carries you over the Wilmot Pass, a 21 km gravel road built in 1963 to 1965 for the Manapouri Power Station and still the only road on the New Zealand mainland disconnected from the rest of the network. The pass is 671 m high and passes Stella Falls on the way down to Deep Cove, where the cruise begins.

Count the legs before you commit. RealNZ's Doubtful Sound day cruise runs 6 hours 45 minutes in total: the 45-minute lake crossing, a 45-minute coach leg and a 2.5-hour cruise. From Queenstown the company puts the trip at 3.5 to 4 hours each way, from Te Anau at 2 to 2.5 hours. That makes it a long but doable day, and the operator notes the trip needs moderate mobility because of the floating wharves and several transfers. The power station itself, 854 MW installed with a machine hall 200 m underground, is indefinitely closed for tours for maintenance.

On the Water

Both fiords are cruised by boat, but the feel on board and on the water is not the same. Here is what a day on each looks like.

A Milford Sound Cruise

Milford Sound cruises run from the wharf beside the Milford Sound Visitor Terminal, and you can cruise 365 days a year. A standard day cruise runs 1.5 to 2 hours and covers the length of the fiord to the open sea. The cliffs rise 1,200 m or more from the water, Mitre Peak drops almost sheer from 1,692 m, and the boats run under waterfalls including Stirling Falls, listed at 151 m by Wikipedia and 155 m by Southern Discoveries. Wildlife is close: New Zealand fur seals haul out at Seal Rock, and the fiord holds the southernmost wild population of bottlenose dolphins. From July to November you may also spot Fiordland crested penguins, with a population of 2,500 to 3,000 breeding pairs.

Choices are wide. The Classic and Signature Cruises start at $80 per person and run 1 hour 40 minutes or 2 hours. The Mitre Peak Small Boat Cruise runs 2 hours with the smallest cruise operator in the fiord for $100. The Nature Cruise with Optional Lunch from Southern Discoveries costs $89 and adds tea and coffee, with a picnic or buffet lunch available to pre-order. The Glass-Roof Catamaran Cruise runs 105 minutes for $93 with live camera footage on TV screens throughout the vessel. The full route and what you pass is described on the homepage cruise route section.

A Doubtful Sound Cruise

The Doubtful Sound day cruise runs 2.5 hours on the water aboard a purpose-built catamaran with upper and lower decks, priced from NZ$399 as RealNZ prints it. The fiord itself is far larger than the cruise time suggests: three arms spread off the main channel, First Arm at 6 km, Hall Arm at 8 km and Crooked Arm at 14 km. RealNZ stops the engines at one point for a moment of silence so guests can hear the stillness, which tells you what kind of place this is. Only about 70 bottlenose dolphins live in Doubtful Sound, one of the southernmost dolphin populations in the world, and sightings of dolphins, fur seals and Fiordland crested penguins vary with the day and season.

The overnight trip is the flagship. It leaves Pearl Harbour at Manapouri at 12:00 PM and returns at noon the next day, from NZ$799 as printed. Two vessels run it, the Fiordland Navigator sleeping 52 and the Wanderer sleeping 36, both with private ensuite cabins and shared twin compartments. RealNZ says no day visitors are aboard, one night runs in summer and two nights in winter, and possible sightings add little blue penguins and occasional New Zealand sea lions. Check-in for the day cruise is at the Manapouri Visitor Centre at least 30 minutes before departure.

Overnight on Milford Sound

Milford Sound has its own overnight option, and it is the only listing on this site that lets you wake up inside the fiord. The RealNZ Overnight Cruise costs $391 per person for 17 hours aboard the Milford Mariner, departing the terminal daily at 4pm and returning at 9:15am the next day. Check-in at the Milford Sound Visitor Terminal is at least 30 minutes before departure.

The vessel sleeps 64 guests and carries 20 kayaks and 2 tender craft, so you can paddle, weather permitting, with kayaking open to guests aged 10 and over. Cabins are private with ensuites, an onboard nature guide covers the fiord's history and wildlife, and dinner and breakfast are included. A $30 overnight parking charge applies.

Lunch is not mentioned by the operator, so plan your own for the day you board. The homepage overnight section has the full detail.

Afternoon view from Wilmot Pass down into Doubtful Sound, compared with a Milford Sound cruise

Afternoon view from Wilmot Pass down into Doubtful Sound. Photo: Pseudopanax at English Wikipedia, Public domain, via Wikimedia Commons

Which One to Choose

Both fiords deliver glaciers' work at scale. The right pick depends on your time, budget and how much driving you want.

Pick Milford Sound If

You have one day, a fixed schedule or a base in Queenstown or Te Anau. The road access means you can drive yourself, take a coach or fly. Entry is cheaper, from $80 per person for a boat-only cruise, against NZ$399 for the Doubtful day trip.

Cruises run 365 days a year. The scenery is vertical in a way Doubtful is not: Mitre Peak and walls over 1,200 m rising straight from dark water, with Stirling Falls and Lady Bowen Falls, given as 162 m and 160 m by different sources, running after rain. Rain itself is part of the show, since the fiord averages 184.8 rainy days a year and rain turns the cliffs into dozens of temporary waterfalls.

Fly over the top if the budget stretches, with fly-cruise trips from Queenstown from $467 per person.

Pick Doubtful Sound If

You have already cruised Milford, or you want a quieter fiord. RealNZ says Doubtful is three times longer and five times deeper at its deepest point, and its day cruise runs on a purpose-built catamaran. The silence stop, where the engines cut for guests to hear the fiord, sums up the difference.

It suits travellers with a full day to spare from Te Anau or Manapouri, and overnight guests get a boat with no day visitors aboard. Wildlife includes about 70 resident bottlenose dolphins, fur seals and penguins, though RealNZ says sightings vary with the day and season. The costs are real: from NZ$399 for the day cruise, from NZ$799 for a night aboard, plus the drive to Manapouri and several transfers, and the trip needs moderate mobility.

If the itinerary is tight, cruise Milford and save Doubtful for a second visit to Fiordland.

Frequently Asked Questions

Why is Doubtful Sound called Doubtful Sound?

Captain Cook named it Doubtful Harbour in 1770. A Spanish expedition visited in February 1793 to take gravity measurements.

Do cruise ships go into Doubtful Sound?

The sources used here do not cover cruise ship visits. There is no direct road into the fiord, so no private vehicle can use the Wilmot Pass Road. Access runs through a 45-minute boat crossing of Lake Manapouri and a coach over the Wilmot Pass to Deep Cove. RealNZ runs a 2.5-hour day cruise from there on a purpose-built catamaran.

Is Doubtful Sound as good as Milford Sound?

It is different rather than better. Doubtful is 40 km long and up to 421 m deep against Milford's 15 km, with wider, less vertical cliffs, while Milford has Mitre Peak, walls over 1,200 m and simpler access. See the full side-by-side table before deciding.

Which is cheaper, Milford Sound or Doubtful Sound?

Milford Sound. Boat-only cruises there start at $80 per person for the Classic Cruise, while the Doubtful Sound day cruise is from NZ$399 as RealNZ prints it. The overnight trips run $391 per person for Milford against NZ$799 for Doubtful.

Can you visit both fiords in one day?

Not realistically. The Milford day trips listed on this site run 9 to 13 hours depending on where they start, and the Doubtful Sound day cruise alone runs 6 hours 45 minutes plus the drive to Manapouri. If you have two days, take a Full-Day Tour from Te Anau for Milford and book Doubtful for the other day.

What is special about Milford Sound?

The scale at the waterline. Mitre Peak rises 1,692 m per DOC, almost sheer from the fiord, rock faces top 1,200 m, and Stirling Falls is listed at 151 to 155 m. Rudyard Kipling called it the eighth Wonder of the World, and the best way to judge is from the water on a Milford Sound cruise.

Sorted on Milford for your trip? The Mitre Peak Small Boat Cruise runs 2 hours from the terminal with the smallest operator on the fiord.

Free cancellation 24 hours ahead, $100 per person, meeting point at the Milford Sound Visitor Terminal.

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