No airlines fly that route direct to my knowledge -- you'd need to go via Bangkok, in which case the only carrier flying the route is Bangkok Airways -- and they're not cheap. From Bangkok to Chiang Mai though there's a host of carriers, including budget carriers Nok Air and Thai AirAsia.
#2 somtam2000 has been a member since 21/1/2004. Location: Indonesia. Posts: 7,800
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I just googled cheap flights from Chiang Mai to Siem Reap and come up with some sites, there was one there that went direct but I can't remember which one, looked at too many by now. Looking at doing the same but it's not cheap. Good luck.
#3 21dee21 has been a member since 19/12/2011. Posts: 2
Lao Airways is a fine carrier, but you'd likely need to connect through Vientiane and Luang Prabang for the trip to Chiang Mai and that wouldn't be cheap and there aren't frequent flights either.
If you've got the time, I think your best bet may be to make the overland trip to Thailand and then down to Bangkok to catch a flight to Chiang Mai on one of the discount airlines Somtam mentioned above. You could save a bit of time by catching a taxi back to Bangkok from the border. It wouldn't be the cheapest options, but the taxi could drop you off right at the airport, and would still be cheaper than the flight from Siem Reap to BKK. Cheers.
Vietnam airlines fly Siem Reap-Luang Prabang, and from there Lao airlines traffic Chiang Mai, price should be around 165 USD from LPB. (bookable online). Don't know the price with Vietnam airlines though..
#5 Sampan has been a member since 3/9/2009. Posts: 110
Just found another site that you might be interested in called www.seat61.com, it has a list of timetables and prices plus has options on how to travel around Cambodia. Is a good site, I'm actually looking at it now as it has more info.
Good luck, check it out
#6 21dee21 has been a member since 19/12/2011. Posts: 2
Hi Everyone, I actually posted that note 5 years ago now so I don't know if things have changed since 2007.
I didn't find any direct flight and we ended up flying Siem Reap to Bankok, then taking the night train to Chiang Mai . I made the mistake of not booking the overnight train a few days in advance and my friends and I had to go on separate trains because there were only single bunks available.
If anyone goes to the Bankok train station, ask for a guy tourism guy named Dang. Incredibly helpful, taught us lots of Thai phrases, told us where to go, planned our time in Chiang Mai with him, even got us food! He's a bit old so I don't know if he is still around. Great guy, full of energy and good spirit.
Hope some of that helps.