Bus
Travelling from Tokyo to Karuizawa overland will inevitably take longer but in many cases it is
the cheapest option if you opt for a bus.
Things to remember: For a more comfortable ride opt for a higher-class bus wherever possible. These buses usually have soft reclining seats and are equipped with air-conditioning and on-board toilets.
They often include water, snacks or a light lunch into your ticket price and make bathroom stops en-route.
Companies operating bus routes between Tokyo and Karuizawa
Seibu Tourist Bus ZSBG1, Syoei Bus SY (昌栄バス), Tokyu Transit XTKT2
Taxi
Some travellers consider taxi to be
the most convenient form of overland transport thanks to flexible departure times, a possibility to choose the size of the car you need, and a hassle-free door-to-door service.
Things to remember: If you are planning to make detours during your trip, discuss it with your driver or service provider in advance as it may affect the price.
Companies offering charters between Tokyo and Karuizawa
BB Global Travel
Train
Train is a often a great choice for long-haul travel especially if you opt for a night sleeper train with berths which will allow you to
sleep all your journey through. To make the most of your train journey, choose the class of your ticket wisely.
Note that there are air-conditioned and fan-only carriages; private compartments for 2 or 4; hard and soft seats.
Though the upper class you get the smoother is your journey, often second class air-conditioned or fan-only sleepers are a good money saving alternative.