Flight Hiroshima - Niigata prices from $135.13

Air Do is a Japanese airline that operates domestic flights within Japan. The airline was established in 1996 and is based in Sapporo, Hokkaido. Air Do operates a fleet of Boeing 737 aircraft and serves destinations such as Tokyo, Osaka, and Fukuoka. The airline's name is derived from the Hokkaido dialect, where "air" means "love" and "do" means "way". Air Do aims to provide a comfortable and convenient travel experience for its passengers, with a focus on safety and reliability. The airline also offers a frequent flyer program called "Mileage Do" for its loyal customers.

Air Seoul is a South Korean low-cost airline that was established in 2016. It is a subsidiary of Asiana Airlines and operates flights to various destinations in Asia, including Japan, China, and Vietnam. The airline operates a fleet of Airbus A321-200 aircraft and offers both economy and premium economy class seating options. Air Seoul aims to provide affordable air travel options to its passengers while maintaining high safety standards. The airline also offers various in-flight services, including meals, beverages, and entertainment options. Air Seoul has received positive reviews for its punctuality, cleanliness, and friendly staff.

Asiana Airlines is a South Korean airline that was founded in 1988. It operates both domestic and international flights to over 90 destinations across Asia, Europe, North America, and Oceania. Asiana Airlines is a member of the Star Alliance, which is the world's largest airline alliance. The airline has won numerous awards for its service, including the Skytrax 5-star rating for 12 consecutive years. Asiana Airlines is known for its comfortable seating, in-flight entertainment, and high-quality meals. The airline also offers a frequent flyer program called Asiana Club, which allows members to earn and redeem miles for flights, upgrades, and other benefits.

Japan Airlines (JAL) is the flag carrier airline of Japan, headquartered in Tokyo. It was founded in 1951 and operates a fleet of over 170 aircraft, serving 92 destinations in 20 countries. JAL is a member of the Oneworld airline alliance and has codeshare agreements with several other airlines. The airline offers a range of classes, including first, business, premium economy, and economy. JAL has won numerous awards for its service, including being named the World's Best Economy Class and Best Economy Class Airline Seat by Skytrax in 2019. The airline is committed to sustainability and has implemented various initiatives to reduce its environmental impact.

Shanghai Airlines is a Chinese airline based in Shanghai, China. It was founded in 1985 and operates both domestic and international flights. The airline is a subsidiary of China Eastern Airlines and is a member of the SkyTeam alliance. Shanghai Airlines has a fleet of over 100 aircraft, including Boeing 737s, 787s, and Airbus A330s. The airline operates flights to over 140 destinations in China and around the world, including Asia, Europe, and North America. Shanghai Airlines is known for its high-quality service and has won numerous awards for its customer satisfaction and safety record.