The Tokyo to Hiroshima run on the Tokaido and Sanyo Shinkansen (Nozomi) takes 4h 0m, and it is the fastest way to make the trip. A one-way adult fare with a reserved seat is 19,440 JPY, which makes a round trip 38,880 JPY. A 7-day Japan Rail Pass costs 50,000 JPY and does not pay off here, because the Nozomi requires an extra fee on top of the pass. For a simple round trip the pass saves 0 JPY, so buying individual tickets is the clear winner. The fare above covers a Reserved Seat, and if you need space for a large suitcase, reserving a seat with an oversized baggage area (for bags 160cm to 250cm in total dimensions) costs no extra fee beyond the standard reserved-seat ticket.
Booking should be painless, but it often isn't if you leave it to the last minute. Station ticket offices frequently have long queues of tourists, and the official JR apps such as SmartEX are known to reject foreign credit cards because of strict 3D Secure checks. A smoother option is to book your tickets, or any pass you decide on, online in advance through
Klook. You pay in your home currency and receive a QR code or exchange voucher, so you can skip the guesswork once you arrive in Tokyo.
Luggage and connectivity are the last things to sort out. On the Shinkansen, bags with total dimensions of 160cm to 250cm need a seat reservation with the oversized baggage area, which is the arrangement described above for this route. Large coin lockers at major stations tend to fill up by mid-morning, so it helps to reserve storage through
Bounce (from 800 JPY/day) or send bags ahead with Takkyubin delivery (about 3,000 JPY) and travel light. Finally, onboard Wi-Fi tends to drop in tunnels, so a Japan eSIM such as
Airalo keeps your maps, messages, and bookings working for the whole 4h 0m ride.