Red Flag Boat by Chao Phraya Express Boat is a public boat service operating along the Chao Phraya River in Bangkok. It is the least common public boat route in the city, as these boats operate during the morning rush hour and in one direction only. Discover the Bangkok Red Flag Boat route map, tickets, and the latest timetable.
Red Flag Boat is an express route operated by the Chao Phraya Express Boat. The service is running from Nonthaburi Pier to Sathorn Pier on weekdays, during the morning rush hour, and in one direction only.
In case you are looking for the most convenient way to travel on the Chao Phraya River, get a Chao Phraya Tourist Boat Day Pass. The ticket allows unlimited traveling between the most popular attractions in the city and saves lots of time.
Bangkok Red Flag Boat Route Map
The map of the Bangkok Red Flag Boat route with all the stops along the route and other boat services available at each pier. If you have no plans to explore the suburbs of the Thai capital city, you can skip to the piers in central Bangkok.
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The full Chao Phraya River pier map can be found here: Bangkok River Pier Map.
Bangkok Red Flag Boat Ticket Price
Starting from 1 May 2026, the Red Flag Boat ticket price is 32 THB per person for a single trip of any distance.
If you prefer comfort and don't mind paying a little bit more, get a Chao Phraya Tourist Boat Day Pass. The ticket allows unlimited traveling between the most popular attractions in the city and saves lots of time.
Ticket Counters
Boat tickets can be purchased at the desk of Chao Phraya Express Boat found at the passenger piers along the route. At the main piers, such as Sathorn Pier, you can find a ticket counter like seen below.
If there is no ticket desk at the pier, you can normally buy a ticket on board the boat.
Bangkok Red Flag Boat Schedule
Red Flag Boat operates Monday–Friday from 06:50 to 07:40 in the morning. The expected frequency is every 15 to 20 minutes.
For a detailed boat departure schedule, check out the Red Flag Boat timetable below.
Departures from Nonthaburi to Sathorn Pier
The Red Flag Boat departures from Nonthaburi to Sathorn Pier in Bangkok on weekdays are scheduled from 06:50 to 07:40 and are the following:
- 06:50
- 07:10, 07:25, 07:40
Other Chao Phraya Express Boat Routes
There are 5 Chao Phraya Express Boat routes operating on the Chao Phraya River in Bangkok:
- Blue Flag
- Orange Flag
- Yellow Flag
- Green Yellow Flag
- Red Flag
Blue Flag Boat, better known as Chao Phraya Tourist Boat, is a tourist boat service running from Phra Arthit Pier to Sathorn Pier and Asiatique Pier (in later hours only). This boat route connects the touristy district of Khao San Road with famous attractions along the Chao Phraya River, such as the Grand Palace and Wat Phra Kaew, Wat Pho, Wat Arun, Chinatown, ICONSIAM, and Asiatique the Riverfront.
Orange Flag Boat is the most affordable Chao Phraya Express Boat service, running between Nonthaburi Pier (N30) and Wat Rajsingkorn Pier (S3). The Orange Flag boat costs less and is a good alternative to the pricier tourist boat.
Yellow Flag Boat is the express service running from Nonthaburi Pier (N30) to Sathorn Pier (Central). Previously, these boats were operating during rush hour only. However, now they also operate at the daytime, when they change the Orange Flag Boat, with several additional stops made along the route.
Green Yellow Flag Boat is the longest route, connecting Pakkret Pier (N33) with Sathorn Pier (Central). These boats are even less frequent than Yellow Flag boats and operate on weekdays and during rush hour only.
Bangkok Boat Travel Tips
The air-conditioned Thai Smile Boat is a good alternative for travelers looking for a more comfortable and environmentally friendly service to explore the Chao Phraya River. If you will be using the electric boat and the electric bus of the same company (Thai Smile Bus) several times a day, consider getting a Thai Go Day Pass, which allows unlimited traveling on 3 boat routes and all Thai Smile Bus routes for 1, 2, or 3 days.
As traffic in the city center is often jammed, public boats can be used as a reliable way to get to the most popular Bangkok river cruise departure points on time.