Ayutthaya's easy distance of 80km from Bangkok means that the most convenient way to reach here is from Bangkok. Once in Bangkok, you can take a train to Ayutthaya.
The closest airport to Ayutthaya is Bangkok's Don Muang. It is very well connected with international and domestic airlines.
Taxi services are available from Bangkok to Ayutthaya. They charge between 800-1,200 Baht, depending upon your bargaining ability. Another option is the minivan which is comfortable as well as cheap, hwere the drivers charge you approximately 70-80 Baht.
Trains leave from the Hua Lamphong Station at Bangkok to go to Ayutthaya very regularly.
Bus is usually considered a more inconvinient option to travel from Bangkok to Ayutthaya because the Morchit bus station is confusing. However, it's a cheaper option than the minivans and cabs.
There are boats from Bangkok to Ayutthaya for approximately 1,000-1,500 Baht.
Once you arrive in Ayutthaya, you will have to choose the ideal mode of transportation for you, depending on your budget and time. Ayutthaya is a small city and walking around to explore it is a good idea. However, if you are here just for a day trip, then time can be a constraint. In that case, another popular option is renting a bicycle which ranges from THB 40 - 60. Certain primary locations in the city have tuk-tuk stands, but they often overcharge, and you need to bargain to get a fair price.
By Bicycle: You can choose to cover distances by cycling through the streets of Ayutthaya. Cycles can be rented all over town, ranging from THB 40 to 100. The Soi 2, where some restaurants and hotels can be found, has several bicycle rental shops. Not all shops will provide locks. Make sure to carry ID to use as a deposit for the cycles.
By Tuk-Tuk: You can also choose to travel by these motorised three-wheeled vehicles. The tuk-tuks in Ayutthaya can fit up to 6 passengers at a time. They can be flagged from the train station, the street or outside many tourist attractions. They usually cost approximately THB 200-300 per hour.
By Motorbike: This is an extremely convenient way to travel around the city. Make sure you are aware and comfortable with traffic rules in Thailand beforehand. You can rent bikes all over town, such as near the railway station and at Soi Thor Kor Sor (near Chao Prom Market). Renting a bike costs approximately THB 300 to 400 a day.
Other than those above most common modes of transportation, you can also opt for other means such as the cyclo, songteow, ferry or minibus. The 'cyclo' (a vehicle made to fit two passengers) and 'songteow' (a vehicle adapted from a truck and used as a share taxi) can be flagged from streets. Minibuses can be hired for approximately THB 400-500 per day from the railway station.