CUSIP No. 486577 109 Page 8 of 11

Exhibit 1

JOINT FILING AGREEMENT

Pursuant to Rule 13d-1(k)(1) under the Securities Exchange Act of 1934, the undersigned hereby agree that only one statement containing the information required by Schedule 13G need be filed with respect to the ownership by each of the undersigned of shares of Kayak Software Corporation.

EXECUTED this 11^th day of February, 2014

GENERAL CATALYST GROUP V, L.P.
By:	GENERAL CATALYST PARTNERS V, L.P.
	its General Partner
	By:	GENERAL CATALYST GP V, LLC
		its General Partner
		By:	/s/ William J. Fitzgerald
			William J. Fitzgerald
			Member, COO and CFO
GENERAL CATALYST GROUP V SUPPLEMENTAL, L.P.
By:	GENERAL CATALYST PARTNERS V, L.P.
	its General Partner
	By:	GENERAL CATALYST GP V, LLC
		its General Partner
		By:	/s/ William J. Fitzgerald
			William J. Fitzgerald
			Member, COO and CFO
GC ENTREPRENEURS FUND V, L.P.
By:	GENERAL CATALYST PARTNERS V, L.P.
	its General Partner
	By:	GENERAL CATALYST GP V, LLC
		its General Partner
		By:	/s/ William J. Fitzgerald
			William J. Fitzgerald
			Member, COO and CFO

CUSIP No. 486577 109 Page 9 of 11

GENERAL CATALYST PARTNERS V, L.P.
By:	GENERAL CATALYST GP V, LLC
	its General Partner
		By:	/s/ William J. Fitzgerald
			William J. Fitzgerald
			Member, COO and CFO
GENERAL CATALYST GP V, LLC
By:	/s/ William J. Fitzgerald
	William J. Fitzgerald
	Member, COO and CFO
GENERAL CATALYST GROUP III, L.P.
By:	GENERAL CATALYST PARTNERS III, L.P.
	its General Partner
	By:	GENERAL CATALYST GP III, LLC
		its General Partner
		By:	/s/ William J. Fitzgerald
			William J. Fitzgerald
			Member, COO and CFO
GC ENTREPRENEURS FUND III, L.P.
By:	GENERAL CATALYST PARTNERS III, L.P.
	its General Partner
	By:	GENERAL CATALYST GP III, LLC
		its General Partner
		By:	/s/ William J. Fitzgerald
			William J. Fitzgerald
			Member, COO and CFO

CUSIP No. 486577 109 Page 10 of 11

GENERAL CATALYST PARTNERS III, L.P.
By:	GENERAL CATALYST GP III, LLC
	its General Partner
		By:	/s/ William J. Fitzgerald
			William J. Fitzgerald
			Member, COO and CFO
GENERAL CATALYST GP III, LLC
By:	/s/ William J. Fitzgerald
	William J. Fitzgerald
	Member, COO and CFO
GENERAL CATALYST GROUP II, L.P.
By:	GENERAL CATALYST PARTNERS II, L.P.
	its General Partner
	By:	GENERAL CATALYST GP II, LLC
		its General Partner
		By:	/s/ William J. Fitzgerald
			William J. Fitzgerald
			Member, COO and CFO
GC ENTREPRENEURS FUND II, L.P.
By:	GENERAL CATALYST PARTNERS II, L.P.
	its General Partner
	By:	GENERAL CATALYST GP II, LLC
		its General Partner
		By:	/s/ William J. Fitzgerald
			William J. Fitzgerald
			Member, COO and CFO

CUSIP No. 486577 109 Page 11 of 11

GENERAL CATALYST PARTNERS II, L.P.
By:	GENERAL CATALYST GP II, LLC
	its General Partner
	By:	/s/ William J. Fitzgerald
		William J. Fitzgerald
		Member, COO and CFO
GENERAL CATALYST GP II, LLC
By:	/s/ William J. Fitzgerald
	William J. Fitzgerald
	Member, COO and CFO
By:	/s/ Joel E. Cutler
	Joel E. Cutler
By:	/s/ David P. Fialkow
	David P. Fialkow
By:	/s/ David J. Orfao
	David J. Orfao