Traveling from Hoi An to Da Nang is straightforward, as the two cities are only about 30 kilometers apart. Here are some popular options (reference price):

1. Bus: Public buses are an affordable choice, with fares starting at around 18,000 VND (approximately $0.80). The journey takes about 1.5 to 2 hours, depending on traffic (Local bus may not working at the reading time) 
2. Minivan or Shuttle Bus: These are faster and more comfortable than public buses, with prices ranging from $2 to $17 per person. Travel time is typically 1 to 1.5 hours.
3. Taxi or Private Car: A taxi or private car is the most convenient option, especially if you're traveling with a group. Prices range from $12 to $35, and the trip takes about 30 minutes to an hour.
4. Grab (Ride-Hailing App): Grab offers both car and motorbike options. It's a flexible and cost-effective way to travel, with prices starting at around $7 for Grab-bike
5. Motorbike: For adventurous travelers, renting a motorbike is a fun way to explore the scenic route between the two cities. Rental costs are affordable, but be sure to have a valid license and wear a helmet.
6. Charter private car, minibus, van transfer: These are faster and more comfortable than public buses, with prices ranging from $15 to $45 per vehicle for 1 way. Travel time is typically 50 minutes.