diff --git a/ui/src/components/AvailabilityCard.tsx b/ui/src/components/AvailabilityCard.tsx
index f829b62..52247a5 100644
--- a/ui/src/components/AvailabilityCard.tsx
+++ b/ui/src/components/AvailabilityCard.tsx
@@ -2,7 +2,7 @@ import { useState } from "react";
 import { Switch } from "@ui/ui-library/switch";
 import { Text } from "@ui/ui-library/text";
 import { Button } from "@ui/ui-library/button";
-import { MinusIcon, PlusIcon } from "@ui/ui-library/icons";
+import { MinusIcon, PlusIcon, CopyIcon } from "@ui/ui-library/icons";
 import {
   Select,
   SelectButton,
@@ -22,6 +22,11 @@ interface AvailabilityCardProps {
   onEnabledChange: (enabled: boolean) => void;
   timeRanges: TimeRange[];
   onTimeRangesChange: (ranges: TimeRange[]) => void;
+  onCopyToOtherDays?: (
+    sourceDay: number,
+    enabled: boolean,
+    timeRanges: TimeRange[]
+  ) => void;
 }
 
 const MINUTES_IN_DAY = 24 * 60;
@@ -146,6 +151,7 @@ export function AvailabilityCard({
   onEnabledChange,
   timeRanges,
   onTimeRangesChange,
+  onCopyToOtherDays,
 }: AvailabilityCardProps) {
   const dayDisplay = DAYS_OF_WEEK_DISPLAY[day];
 
@@ -239,6 +245,17 @@ export function AvailabilityCard({
     <div className="flex flex-col gap-2 w-full">
       <div className="flex items-center justify-between">
         <Text className="text-lg font-semibold">{dayDisplay}</Text>
+        {onCopyToOtherDays && enabled && timeRanges.length > 0 && (
+          <Button
+            size="sm"
+            variant="outline"
+            onPress={() => onCopyToOtherDays(day, enabled, timeRanges)}
+            className="h-6 px-2 text-xs border-gray-300 hover:border-primary hover:bg-primary/5 text-gray-600 hover:text-primary"
+          >
+            <CopyIcon className="size-3 mr-1" />
+            Copier
+          </Button>
+        )}
       </div>
       <div className="flex items-center gap-2">
         <Switch
diff --git a/ui/src/pages/availabilities.tsx b/ui/src/pages/availabilities.tsx
index 8b8ec00..f910299 100644
--- a/ui/src/pages/availabilities.tsx
+++ b/ui/src/pages/availabilities.tsx
@@ -8,8 +8,77 @@ import {
   WeeklyAvailability,
 } from "@ui/hooks/availabilities";
 import { toast } from "@ui/ui-library/toast/toast-queue";
+import { useState } from "react";
+import { Checkbox } from "@ui/ui-library/checkbox";
+
+// Custom Modal Component
+interface CustomModalProps {
+  isOpen: boolean;
+  onClose: () => void;
+  title: string;
+  children: React.ReactNode;
+}
+
+function CustomModal({ isOpen, onClose, title, children }: CustomModalProps) {
+  if (!isOpen) return null;
+
+  return (
+    <div className="fixed inset-0 z-50 flex items-center justify-center">
+      {/* Backdrop */}
+      <div
+        className="absolute inset-0 bg-black/50 backdrop-blur-sm"
+        onClick={onClose}
+      />
+
+      {/* Modal */}
+      <div className="relative bg-white dark:bg-gray-800 rounded-xl shadow-2xl border border-gray-200 dark:border-gray-700 w-full max-w-md mx-4 max-h-[90vh] overflow-hidden">
+        {/* Header */}
+        <div className="flex items-center justify-between p-6 border-b border-gray-200 dark:border-gray-700">
+          <h2 className="text-xl font-semibold text-gray-900 dark:text-gray-100">
+            {title}
+          </h2>
+          <button
+            onClick={onClose}
+            className="p-1 rounded-lg hover:bg-gray-100 dark:hover:bg-gray-700 transition-colors"
+          >
+            <svg
+              className="w-5 h-5 text-gray-500"
+              fill="none"
+              stroke="currentColor"
+              viewBox="0 0 24 24"
+            >
+              <path
+                strokeLinecap="round"
+                strokeLinejoin="round"
+                strokeWidth={2}
+                d="M6 18L18 6M6 6l12 12"
+              />
+            </svg>
+          </button>
+        </div>
+
+        {/* Content */}
+        <div className="p-6">{children}</div>
+      </div>
+    </div>
+  );
+}
 
 const DAYS_OF_WEEK = [0, 1, 2, 3, 4, 5, 6];
+const DAYS_OF_WEEK_DISPLAY = [
+  "Lundi",
+  "Mardi",
+  "Mercredi",
+  "Jeudi",
+  "Vendredi",
+  "Samedi",
+  "Dimanche",
+];
+
+interface TimeRange {
+  start: string;
+  end: string;
+}
 
 export function AvailabilitiesPage() {
   const {
@@ -19,6 +88,47 @@ export function AvailabilitiesPage() {
     setDraftAvailabilities,
   } = useAvailabilities();
 
+  const [copyModalOpen, setCopyModalOpen] = useState(false);
+  const [sourceDayData, setSourceDayData] = useState<{
+    day: number;
+    enabled: boolean;
+    timeRanges: TimeRange[];
+  } | null>(null);
+  const [selectedDays, setSelectedDays] = useState<number[]>([]);
+
+  const handleCopyToOtherDays = (
+    sourceDay: number,
+    enabled: boolean,
+    timeRanges: TimeRange[]
+  ) => {
+    setSourceDayData({ day: sourceDay, enabled, timeRanges });
+    setSelectedDays([]);
+    setCopyModalOpen(true);
+  };
+
+  const applyCopyToSelectedDays = () => {
+    if (!sourceDayData) return;
+
+    const updatedAvailabilities = { ...draftAvailabilities };
+    selectedDays.forEach((day) => {
+      updatedAvailabilities[day] = {
+        enabled: sourceDayData.enabled,
+        timeRanges: [...sourceDayData.timeRanges],
+      };
+    });
+
+    setDraftAvailabilities(updatedAvailabilities);
+    setCopyModalOpen(false);
+    setSourceDayData(null);
+    setSelectedDays([]);
+
+    toast.add({
+      title: "Succès",
+      description: `Horaires copiés vers ${selectedDays.length} jour(s)`,
+      type: "success",
+    });
+  };
+
   return (
     <div className="h-full flex flex-col p-4">
       <div className="flex justify-between items-start mb-3">
@@ -91,6 +201,7 @@ export function AvailabilitiesPage() {
                           },
                         });
                       }}
+                      onCopyToOtherDays={handleCopyToOtherDays}
                     />
                   </div>
                 </div>
@@ -164,6 +275,57 @@ export function AvailabilitiesPage() {
           {isUpdating ? "Enregistrement..." : "Enregistrer les disponibilités"}
         </Button>
       </div>
+
+      {/* Copy Modal */}
+      <CustomModal
+        isOpen={copyModalOpen}
+        onClose={() => setCopyModalOpen(false)}
+        title={`Copier les horaires de ${
+          sourceDayData ? DAYS_OF_WEEK_DISPLAY[sourceDayData.day] : ""
+        }`}
+      >
+        <div className="space-y-4">
+          <Text className="text-gray-600 dark:text-gray-400">
+            Sélectionnez les jours vers lesquels vous souhaitez copier ces
+            horaires :
+          </Text>
+
+          <div className="space-y-3 max-h-60 overflow-y-auto">
+            {DAYS_OF_WEEK.filter((day) => day !== sourceDayData?.day).map(
+              (day) => (
+                <Checkbox
+                  key={day}
+                  isSelected={selectedDays.includes(day)}
+                  onChange={(isSelected) => {
+                    if (isSelected) {
+                      setSelectedDays([...selectedDays, day]);
+                    } else {
+                      setSelectedDays(selectedDays.filter((d) => d !== day));
+                    }
+                  }}
+                >
+                  <Text className="font-medium">
+                    {DAYS_OF_WEEK_DISPLAY[day]}
+                  </Text>
+                </Checkbox>
+              )
+            )}
+          </div>
+
+          <div className="flex justify-end gap-3 pt-4 border-t border-gray-200 dark:border-gray-700">
+            <Button variant="outline" onPress={() => setCopyModalOpen(false)}>
+              Annuler
+            </Button>
+            <Button
+              variant="solid"
+              isDisabled={selectedDays.length === 0}
+              onPress={applyCopyToSelectedDays}
+            >
+              Copier vers {selectedDays.length} jour(s)
+            </Button>
+          </div>
+        </div>
+      </CustomModal>
     </div>
   );
 }