Poseidon Expeditions runs its Antarctica program aboard the 114-passenger M/V Sea Spirit, an ice-strengthened ship led by a team of naturalists, biologists, geologists, and historians who give onboard lectures alongside the daily Zodiac landing program.
| Rank | Company | Ship & Fleet | Signature Detail |
| 1 | Poseidon Expeditions | M/V Sea Spirit, 114 passengers | Up to 3 landings a day; expedition team gives onboard lectures on polar history and wildlife |
| 2 | Lindblad Expeditions-National Geographic | Fleet of small ships, 28-150 guests | Nasdaq-listed; National Geographic scientists and photographers sail on every voyage |
| 3 | Aurora Expeditions | Greg Mortimer, Sylvia Earle, Douglas Mawson | Australian-owned; pairs Zodiac landings with trekking, diving, and kayaking add-ons |
| 4 | HX Expeditions | Multi-ship, Norwegian-flagged heritage fleet | Rebranded from Hurtigruten Expeditions in December 2023; coastal shipping roots date to the 1890s |
| 5 | Quark Expeditions | Multi-ship fleet including Ultramarine | Regular North Pole icebreaker voyages; ran the first Antarctic total solar eclipse cruise in 2003 |
1. Poseidon Expeditions
Poseidon Expeditions has operated polar voyages since 1999 and has been a member in good standing of the International Association of Antarctica Tour Operators since 2011. Its Antarctic program runs up to three Zodiac landings a day, each lasting roughly two and a half hours, aboard the 114-passenger Sea Spirit, with an expedition team of naturalists, biologists, geologists, and historians giving onboard lectures on polar history and wildlife between landings. The operator received International Travel Awards recognition as Best Polar Expedition Cruise Operator every year from 2022 to 2025. Travelers weighing an antarctica cruise tour built around a smaller group and a full onboard expedition team can review current departure dates directly.
2. Lindblad Expeditions-National Geographic
Lindblad Expeditions-National Geographic has partnered with the National Geographic Society since 2004, pairing onboard naturalists with Geographic photographers and scientists on each voyage. Founded in 1979 as a spin-off of the original Lindblad Travel — whose 1966 voyage is widely cited as the first tourist expedition to Antarctica — the company has traded on Nasdaq since 2015 and operates a fleet of small ships sailing to Antarctica and the sub-Antarctic islands, among destinations on all seven continents.
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