Hello! That sounds like an amazing trip across Russia. Here are some travel tips for your journey.

Best Time to Visit:
The best time to visit these Russian cities is often between May and September when the weather is mild. However, if you enjoy winter sports or want to experience Christmas markets, December to February might suit you better.

Route and Accessibility:
Major international airlines fly into Volgograd, Samara, and Tver. From Volgograd, you can take a direct flight to Saratov. After visiting Saratov, you can take direct flights to Samara and then to Yaroslavl. From Yaroslavl, you travel to Tver by road or rail.

Accommodation and Booking:
Accommodation is plentiful across all cities. It's best to book your accommodations in advance, which can easily be done online through platforms like Booking.com or Airbnb. You can find everything from hostels to five-star hotels.

Clothing and Essentials:
Pack according to the season. For the cold months, layered clothing, thermal inners, and sturdy boots are essential. For the summer months, pack light clothes with a few warmer layers for cooler evenings. Also, pack an umbrella or raincoat during summertime for occasional showers.

Health and Safety:
Ensure you're up to date on routine vaccines before the trip. For safety, be aware of your surroundings and keep personal belongings secure, especially in crowded places. Most of these cities are fairly safe, but usual travel caution is advised.

Local Etiquette and Respect:
Russians appreciate politeness, so learn a few basic Russian phrases. Remove your shoes when entering a Russian home and always shake hands when meeting people. Be respectful when visiting religious sites.