External Variable
Semantics
Range
Default
Example
ai
Affiliate identifier provided by Kayak.com.
Character string. No embedded whitespace or special characters.
Empty string.
p
Optional Sub-Affiliate identifier. This is a
pass-thru value from Kayak's perspective; used by affiliate for
internal promotion tracking if desired.
Character string. No embedded whitespace or special characters.
Empty string.
-none-
promo1
promo2
do
Answers the question: "Should we do the search as opposed to just
pre-populating the search form?".
y,n,on,off
y
y
n
ft
Flight-type indicating oneway or roundtrip.
ow,rt
rt
rt
ow
ns
Answers the question "Is a non-stop flight preferred?"
y,n,on,off
n
y
n
cb
Cabin Class is used to indicate one of economy, business or first.
e, b, f
e
e
b
f
pa
Number of Travelers
1,2,3,4,5,6
1
1
2
3
4
5
6
l1
Origin airport/location.
If it's 3 characters, we'll assume it's a 3 character airport code. Otherwise,
we assume a comma separated list of City, State, Country. If omitted, we will
attempt to determine the nearest airport based on your IP address.
t1
Outbound departure time can be specified as any, morning, afternoon or evening.
a,r,m,n,e,l (for Any, Early, Morning, Noon, Evening, Late)
a
a
r
m
n
e
l
df
Date format for dates in this request.
us1, mdy, dmy, ymd
us1
us1 (MM/DD/YYYY)
mdy (MM/DD/YYYY)
dmy (DD/MM/YYYY)
ymd (YYYY/MM/DD)
d1
Outbound departure Date.
Format specified by field df. (MM/DD/YYYY)
14 days from now.
depart_flex
Flexible departure date.
Number of days to search before and after the departure date. Logged in users only.
Exact dates.
exact
+/- 1 day
+/- 2 days
+/- 3 days
r1
Answers the question "Show regional/nearby airports for outbound flights?"
y,n,on,off
n
y
n
l2
Destination airport/location.
If it's 3 characters, we'll assume it's a 3 character airport code. Otherwise,
we assume a comma separated list of City, State, Country.
t2
Return departure time can be specified as any, morning, afternoon or evening.
a,r,m,n,e,l (for Any, Early, Morning, Noon, Evening, Late)
a
a
r
m
n
e
l
d2
Return departure Date
Format specified by field df. (MM/DD/YYYY)
21 days from now.
return_flex
Flexible return date.
Number of days to search before and after the return date. Logged in users only.
Exact dates.
exact
+/- 1 day
+/- 2 days
+/- 3 days
r2
Answers the question "Show regional/nearby airports for return flights?"
y,n,on,off
n
y
n
b
Brand identifier used to preset the search-results filter so that only
this brand is initially shown in the results.
2 character airline code.
