I am planning a trip to both Lenin peak and Muztaqh Ata this year and looking for any good tour operators that organize these trips. I am planning to do it alone.

I have come across few sites that organize these expeditions but how reliable are they?

http://www.ak-sai.com/
http://centralasia-adventures.com
http://www.centralasia-travel.com/en/

In addition, is it safe to go there and when it best season for such activities?

Climb Lenin Peak Ak sai Is good agent in Kirgizstan .We cooperated with them before.
They have many different options very actual.
Climb Muztagh Ata We are also good agent in kashgar.Boths u climb we can organize for you too.
U can frist climb to Peaklenin after climb up to muztagh ata better becuase muztagh ata can sky down.

kashgar7 wrote:Climb Lenin Peak Ak sai Is good agent in Kirgizstan .We cooperated with them before.
They have many different options very actual.
Climb Muztagh Ata We are also good agent in kashgar.Boths u climb we can organize for you too.
U can frist climb to Peaklenin after climb up to muztagh ata better becuase muztagh ata can sky down.

could you give some idea about costs, what is included etc? do you have a website?

Ur questins reply to ur Pv box and e mail.
Please need more info check my porfile

Hello,
We have groups on the following date especially designed for individual climbers and small groups. Please join one of them and save your money.
Kashgar to Kashgar
2013.7.29—1013.8.19
Bishkek to Bishkek
01.07.2013 – 25.07.2013 (7.3 arrive in Kashgar)
22.07.2013 - 15.08.2013 (7.24arrive in Kashgar)
It is also possible to join this group from Kashgar.
Here is our contact address:
Kashgar Mountaineering Adventures（KMA）
YUDU mansion, 43 South Jiefang Road, Kashgar, China
Tel: +86 -998-2821832
Fax: +86 -998-2835444
Email: keyoum@263.net
Site: www.kashgaralpine.com
Sincerely yours，
Keyoum Mohammad
Managing director of Kashgar Mountaineering Adventures