diff --git a/lib/open_trip_planner_client/plan_params.ex b/lib/open_trip_planner_client/plan_params.ex
index 709f6dd..9110068 100644
--- a/lib/open_trip_planner_client/plan_params.ex
+++ b/lib/open_trip_planner_client/plan_params.ex
@@ -13,6 +13,7 @@ defmodule OpenTripPlannerClient.PlanParams do
     :date,
     :time,
     arriveBy: false,
+    numItineraries: 5,
     transportModes: [%{mode: :WALK}, %{mode: :TRANSIT}],
     wheelchair: false
   ]
@@ -101,6 +102,7 @@ defmodule OpenTripPlannerClient.PlanParams do
           arriveBy: arrive_by(),
           fromPlace: place(),
           date: date(),
+          numItineraries: integer(),
           time: time(),
           toPlace: place(),
           transportModes: transport_modes(),
diff --git a/priv/plan.graphql b/priv/plan.graphql
index f8c4ba7..a69d3eb 100644
--- a/priv/plan.graphql
+++ b/priv/plan.graphql
@@ -6,6 +6,7 @@ query TripPlan(
   $arriveBy: Boolean
   $wheelchair: Boolean
   $transportModes: [TransportMode]
+  $numItineraries: Int
 ) {
   plan(
     fromPlace: $fromPlace
@@ -20,7 +21,7 @@ query TripPlan(
     searchWindow: 7200
 
     # Increased from 3 to offer more itineraries for potential post-processing
-    numItineraries: 5
+    numItineraries: $numItineraries
 
     # Increased from 2.0 to reduce number of itineraries with significant walking
     walkReluctance: 5.0
diff --git a/test/open_trip_planner_client/plan_params_test.exs b/test/open_trip_planner_client/plan_params_test.exs
index 57185da..45356ee 100644
--- a/test/open_trip_planner_client/plan_params_test.exs
+++ b/test/open_trip_planner_client/plan_params_test.exs
@@ -18,6 +18,18 @@ defmodule OpenTripPlannerClient.PlanParamsTest do
     assert to_time_param(now) == time
   end
 
+  test "new/1 defaults to having 5 itineraries" do
+    assert %OpenTripPlannerClient.PlanParams{
+             numItineraries: 5
+           } = new()
+  end
+
+  test "new/1 allows a customizable number of itineraries" do
+    assert %OpenTripPlannerClient.PlanParams{
+             numItineraries: 42
+           } = new(%{numItineraries: 42})
+  end
+
   test "to_place_param/1 with stop" do
     name = Faker.App.name()
     stop_id = Faker.Internet.slug()