diff --git a/moto/ec2/models.py b/moto/ec2/models.py
index da60d211f..4fae52a2d 100644
--- a/moto/ec2/models.py
+++ b/moto/ec2/models.py
@@ -4319,6 +4319,7 @@ class Route(CloudFormationModel):
         gateway=None,
         instance=None,
         nat_gateway=None,
+        transit_gateway=None,
         interface=None,
         vpc_pcx=None,
     ):
@@ -4332,6 +4333,7 @@ class Route(CloudFormationModel):
         self.gateway = gateway
         self.instance = instance
         self.nat_gateway = nat_gateway
+        self.transit_gateway = transit_gateway
         self.interface = interface
         self.vpc_pcx = vpc_pcx
 
@@ -4358,6 +4360,7 @@ class Route(CloudFormationModel):
         instance_id = properties.get("InstanceId")
         interface_id = properties.get("NetworkInterfaceId")
         nat_gateway_id = properties.get("NatGatewayId")
+        transit_gateway_id = properties.get("TransitGatewayId")
         pcx_id = properties.get("VpcPeeringConnectionId")
 
         route_table_id = properties["RouteTableId"]
@@ -4368,6 +4371,7 @@ class Route(CloudFormationModel):
             gateway_id=gateway_id,
             instance_id=instance_id,
             nat_gateway_id=nat_gateway_id,
+            transit_gateway_id=transit_gateway_id,
             interface_id=interface_id,
             vpc_peering_connection_id=pcx_id,
         )
@@ -4596,11 +4600,13 @@ class RouteBackend(object):
         gateway_id=None,
         instance_id=None,
         nat_gateway_id=None,
+        transit_gateway_id=None,
         interface_id=None,
         vpc_peering_connection_id=None,
     ):
         gateway = None
         nat_gateway = None
+        transit_gateway = None
 
         route_table = self.get_route_table(route_table_id)
 
@@ -4623,6 +4629,8 @@ class RouteBackend(object):
 
             if nat_gateway_id is not None:
                 nat_gateway = self.nat_gateways.get(nat_gateway_id)
+            if transit_gateway_id is not None:
+                transit_gateway = self.transit_gateways.get(transit_gateway_id)
 
         route = Route(
             route_table,
@@ -4632,6 +4640,7 @@ class RouteBackend(object):
             gateway=gateway,
             instance=self.get_instance(instance_id) if instance_id else None,
             nat_gateway=nat_gateway,
+            transit_gateway=transit_gateway,
             interface=None,
             vpc_pcx=self.get_vpc_peering_connection(vpc_peering_connection_id)
             if vpc_peering_connection_id
diff --git a/moto/ec2/responses/route_tables.py b/moto/ec2/responses/route_tables.py
index 8944e9d34..f9501653d 100644
--- a/moto/ec2/responses/route_tables.py
+++ b/moto/ec2/responses/route_tables.py
@@ -21,6 +21,7 @@ class RouteTables(BaseResponse):
         gateway_id = self._get_param("GatewayId")
         instance_id = self._get_param("InstanceId")
         nat_gateway_id = self._get_param("NatGatewayId")
+        transit_gateway_id = self._get_param("TransitGatewayId")
         interface_id = self._get_param("NetworkInterfaceId")
         pcx_id = self._get_param("VpcPeeringConnectionId")
 
@@ -31,6 +32,7 @@ class RouteTables(BaseResponse):
             gateway_id=gateway_id,
             instance_id=instance_id,
             nat_gateway_id=nat_gateway_id,
+            transit_gateway_id=transit_gateway_id,
             interface_id=interface_id,
             vpc_peering_connection_id=pcx_id,
         )
@@ -198,6 +200,10 @@ DESCRIBE_ROUTE_TABLES_RESPONSE = """
                   <natGatewayId>{{ route.nat_gateway.id }}</natGatewayId>
                   <state>active</state>
                 {% endif %}
+                {% if route.transit_gateway %}
+                  <transitGatewayId>{{ route.transit_gateway.id }}</transitGatewayId>
+                  <state>active</state>
+                {% endif %}
               </item>
             {% endfor %}
           </routeSet>
diff --git a/tests/terraform-tests.success.txt b/tests/terraform-tests.success.txt
index c80b861d4..74ee381ec 100644
--- a/tests/terraform-tests.success.txt
+++ b/tests/terraform-tests.success.txt
@@ -82,6 +82,7 @@ TestAccAWSRouteTable_vgwRoutePropagation
 TestAccAWSRouteTable_RequireRouteTarget
 TestAccAWSRouteTable_disappears_SubnetAssociation
 TestAccAWSRouteTable_IPv4_To_NatGateway
+TestAccAWSRouteTable_IPv4_To_TransitGateway
 TestAccAWSRouteTable_disappears
 TestAccAWSRouteTable_basic
 TestAccAwsEc2ManagedPrefixList
\ No newline at end of file