UNITED STATES

SECURITIES AND EXCHANGE COMMISSION

Washington, D.C. 20549

Schedule 13G

Under the Securities Exchange Act of 1934

(Amendment No. 1)*

Qunar Cayman Islands Limited

(Name of Issuer)

Class B Ordinary Shares, par value $0.001 per share

(Title of Class of Securities)

74906P1049**

(CUSIP Number)

January 12, 2016

(Date of Event which Requires Filing of this Statement)

Check the appropriate box to designate the rule pursuant to which this Schedule is filed:

¨ Rule 13d-1(b)

x Rule 13d-1(c)

¨ Rule 13d-1(d)

The information required in the remainder of this cover page shall not be deemed to be “filed” for the purpose of Section 18 of the Securities Exchange Act of 1934 (“Act”) or otherwise subject to the liabilities of that section of the Act but shall be subject to all other provisions of the Act (however, see the Notes).

Item 1(a) Name of Issuer:

Qunar Cayman Islands Limited (the “Company”).

Item 1(b) Address of Issuer’s Principal Executive Offices:

The Company’s principal executive offices are at 17th Floor, Viva Plaza, Building 18, Yard 29, Suzhou Street, Haidian District, Beijing, People’s Republic of China.

Item 2(a) Name of Person Filing:

This Schedule 13G is being jointly filed by SL Camel Holdco Limited (the “Holdco”), Silver Lake Partners IV Cayman, L.P. (“SLP IV Fund”), Silver Lake Technology Associates IV Cayman, L.P. (“SLP Fund GP”) and Silver Lake (Offshore) AIV GP IV, LTD. (“SLP AIV GP”) (collectively, the “Reporting Persons”).

The Reporting Persons have entered into a Joint Filing Agreement, dated June 29, 2015, a copy of which is attached as Exhibit A to the initial Schedule 13G filed by the Reporting Persons on June 29, 2015 (the “Initial Schedule 13G”), pursuant to which the Reporting Persons agreed to file the Initial Schedule 13G and any amendments thereto jointly in accordance with the provisions of Rule 13d-1(k)(1) under the Exchange Act.

Item 2(b) Address of Principal Business Office or, if none, Residence:

The address of the principal business office of each Reporting Person is c/o Silver Lake Partners, 2775 Sand Hill Road, Suite 100, Menlo Park, CA 94025.

Item 2(c) Citizenship:

Each Reporting Person is organized under the laws of the Cayman Islands.

Item 2(d) Title of Class of Securities:

Class B Ordinary Shares, par value $0.001 per share (the “Class B Ordinary Shares”).

Item 2(e) CUSIP Number:

74906P1049 (This CUSIP applies to the American Depositary Shares of the Issuer, each representing 3 Class B Ordinary Shares)

Item 3 If this statement is filed pursuant to §§ 240.13d-1(b) or 240.13d-2(b) or (c), check whether the person filing is a:

Not applicable.

Item 4 Ownership:

None of the Reporting Persons beneficially owns any Ordinary Shares.

Not applicable.

Not applicable.

Not applicable.

Not applicable.

Not applicable.

Item 5 Ownership of Five Percent or Less of a Class:

If this statement is being filed to report the fact that as of the date hereof the reporting person has ceased to be the beneficial owner of more than five percent of the class of securities, check the following:  x

Item 6 Ownership of More Than Five Percent on Behalf of Another Person:

Not Applicable.

Item 7 Identification and Classification of the Subsidiary Which Acquired the Security Being Reported on By the Parent Holding Company:

Not Applicable.

Item 8 Identification and Classification of Members of the Group:

See Exhibit A attached to the Initial Schedule 13G.

Item 9 Notice of Dissolution of Group:

Not Applicable.

Item 10 Certification:

By signing below each of the undersigned certifies that, to the best of its knowledge and belief, the securities referred to above were not acquired and are not held for the purpose of or with the effect of changing or influencing the control of the issuer of the securities and were not acquired and are not held in connection with or as a participant in any transaction having that purpose or effect, other than activities solely in connection with a nomination under §240.14a-11.

SIGNATURES

After reasonable inquiry and to the best of my knowledge and belief, I certify that the information set forth in this statement is true, complete and correct.

Date: January 12, 2016