How far is Siem Reap from Vientiane? Here's the quick answer if you don't sleep at all, or you have a friend with you so each person can drive some of the way, letting you make the entire trip by car without stopping.
Nonstop drive: 482 miles or 776 km
Driving time: 9 hours, 32 minutes
This is a pretty long drive, so it's not very realistic to drive nonstop. To get a better idea of how long this road trip would really be, scroll down to calculate how many hours it would take if you drive with stops.
Now let's assume you have a private jet and you can fly in the fastest possible straight line between Vientiane, Laos and Siem Reap, Cambodia. Because of the curvature of the Earth, the shortest distance is actually the "great circle" distance, or "as the crow flies" which is calculated using an iterative Vincenty formula.
Flight distance: 328 miles or 527 km
Flight time: 1 hour, 9 minutes
The straight line flight distance is 154 miles less than driving on roads, which means the driving distance is roughly 1.5x of the flight distance.
Your plane flies much faster than a car, so the flight time is about 1/8th of the time it would take to drive.
This is a relatively short flight in a private plane, but you might be planning to book a commercial flight. In that case, your travel time would really need to include how many minutes to get to your local airport, wait for security, board and taxi on the runway, land at the other airport, and get to your destination. Scroll down to see a more realistic calculation that takes into account all these factors to get a more accurate estimate of your actual flight time.
Let's say you're actually planning a road trip to Siem Reap, and you want to stop along the way to rest. If it's a real road trip, you might want to check out interesting stops along the way, eat at great restaurants, and maybe even find a hotel to stay overnight. That's what Trippy is perfect for, helping you figure out travel plans in detail.
Based on the length of this trip, we think you could spread out this fun road trip over more than one day.
Road trip: 2 days of driving
With the full itinerary planned out, we can estimate your total travel time for this trip.
Travel time: 10.5 hours on the road with 1 overnight
Itinerary
Start in Vientiane.
Drive for about 1.5 hours, then stop in Udon Thani and stay for about 1 hour.
Next, drive for another 2 hours then stop in Khon Kaen. Stay overnight.
The next day, drive for about 4 hours, then stop in Surin and stay for about 1 hour.
Finally, drive for about 3 hours and arrive in Siem Reap.
To see all the details on this itinerary, including recommended restaurants, hotels, and things to do along the way, check out the full road trip planner:
In the quick calculation above, we assumed you had a private plane and just wanted to know the time in the air from city to city. But for most of us, we're going to be flying on a commercial airline (whether it's first class or coach). So that means we really need to account for all the extra travel time getting to the airport, waiting for our flight, and making it to the destination.
To give you a better estimate of real-life travel, we've put together a flight itinerary with actual airports. Eventually you'll be able to customize this plan, choosing your own airports and flights. But for now, here's an example we've selected to give you an idea of how traveling might work between airports.
Departure airport: Wattay International Airport (VTE)
Arrival airport: Siem Reap-Angkor International Airport (REP)
With the airports selected, we can estimate the travel time to and from the airport, based on how far the airport is from downtown.
Getting to the airport: 9 minutes
Getting to your destination: 14 minutes
Now finally, let's look at an actual flight from VTE connecting through PKZ and arriving at REP flying on Lao Airlines. We can figure out how long it would take to fly including take-off and landing, time to taxi on the runways, and an average layover time of about 2 hours.
Initial flight time: 1 hour, 5 minutes
Connecting airport: Pakse International Airport (PKZ)
Connection flight time: 51 minutes
So now we can finally get an idea of the total travel time from Vientiane to Siem Reap including time spent getting to and from the airports, roughly 2 hours at the departure airport for TSA security lines and waiting at the gate, plus the connecting flight with a 2-hour layover.
Total travel time: 6 hours
To see the details on this flight plan, including recommended airports, airline, and route, check out the flight planner:
Trippy has a ton of information that can help you plan your trip to Siem Reap, Cambodia. Start by reading the Trippy page on where to stay in Siem Reap. If you're looking for a place to stay, you might want to check out Sofitel Angkor Phokeethra Golf & Spa Resort. A great place to eat might be The Sugar Palm. Trippy members can suggest things to do in Siem Reap like Angkor Wat. Check out some of the questions people have asked about Siem Reap like Where to stay and eat for one weekend in Siem Reap?. Click the button below to explore Siem Reap in detail.
The distance is the same either way if you're flying a straight line (or driving the same roads back and forth). But for a real trip, there can be plenty of differences so go ahead and check the reverse directions to get the distance from Siem Reap to Vientiane, or go to the main page to calculate the distance between cities.
If you happen to know Vientiane, don't forget to help other travelers and answer some questions about Vientiane!
More info on this route:
drive from Vientiane to Siem Reap
road conditions
alternate routes
Google driving directions