diff --git a/web/src/workspaces/api.ts b/web/src/workspaces/api.ts
index 46b568e..4bb1ef5 100644
--- a/web/src/workspaces/api.ts
+++ b/web/src/workspaces/api.ts
@@ -1,7 +1,7 @@
 import { fetchApi, type ApiError } from "@/api";
 import type { QueryStatus } from "@/lib/query";
 import { useCallback, useState } from "react";
-import useSWR, { useSWRConfig } from "swr";
+import useSWR, { mutate, useSWRConfig } from "swr";
 import {
 	type Workspace,
 	type WorkspacePortMapping,
@@ -200,6 +200,46 @@ function useAddWorkspacePort() {
 	return { addWorkspacePort, status };
 }
 
+function useDeleteWorkspacePort() {
+	const [status, setStatus] = useState<QueryStatus<ApiError>>({ type: "idle" });
+
+	const deleteWorkspacePort = useCallback(
+		async (workspaceName: string, portName: string) => {
+			setStatus({ type: "loading" });
+			try {
+				await mutate(
+					"/workspaces",
+					fetchApi(`/workspaces/${workspaceName}/forwarded-ports/${portName}`, {
+						method: "DELETE",
+					}),
+					{
+						populateCache: (_, workspaces) =>
+							workspaces.map(
+								(it: Workspace): Workspace =>
+									it.name === workspaceName
+										? {
+												...it,
+												ports: it.ports?.filter(
+													(port) => port.subdomain !== portName,
+												),
+											}
+										: it,
+							),
+						revalidate: false,
+						throwOnError: true,
+					},
+				);
+				setStatus({ type: "ok" });
+			} catch (error: unknown) {
+				setStatus({ type: "error", error: error as ApiError });
+			}
+		},
+		[],
+	);
+
+	return { deleteWorkspacePort, status };
+}
+
 function useWorkspaceRuntimes() {
 	return useSWR(
 		"/workspace-runtimes",
@@ -215,4 +255,5 @@ export {
 	useDeleteWorkspace,
 	useAddWorkspacePort,
 	useWorkspaceRuntimes,
+	useDeleteWorkspacePort,
 };
diff --git a/web/src/workspaces/workspace-port-info-tab.tsx b/web/src/workspaces/workspace-port-info-tab.tsx
index d85f485..3273ed1 100644
--- a/web/src/workspaces/workspace-port-info-tab.tsx
+++ b/web/src/workspaces/workspace-port-info-tab.tsx
@@ -10,13 +10,14 @@ import {
 	TableHeader,
 	TableRow,
 } from "@/components/ui/table";
+import { useToast } from "@/hooks/use-toast";
 import { superstructResolver } from "@hookform/resolvers/superstruct";
 import { Check, Trash2, X } from "lucide-react";
-import { useContext, useId } from "react";
+import { useContext, useEffect, useId } from "react";
 import { useForm } from "react-hook-form";
 import { type Infer, number, object, pattern, size, string } from "superstruct";
 import { create } from "zustand";
-import { useAddWorkspacePort } from "./api";
+import { useAddWorkspacePort, useDeleteWorkspacePort } from "./api";
 import { WorkspaceTableRowContext } from "./workspace-table";
 
 interface PortInfoTabStore {
@@ -57,7 +58,7 @@ function PortInfoTableBody() {
 					<TableCell className="py-0">{subdomain}</TableCell>
 					<TableCell className="py-0">{port}</TableCell>
 					<TableCell className="p-0 text-right">
-						<DeletePortMappingButton />
+						<DeletePortMappingButton subdomain={subdomain} />
 					</TableCell>
 				</TableRow>
 			))}
@@ -183,10 +184,34 @@ function NewPortMappingRow() {
 	);
 }
 
-function DeletePortMappingButton() {
+function DeletePortMappingButton({ subdomain }: { subdomain: string }) {
+	const { deleteWorkspacePort, status } = useDeleteWorkspacePort();
+	const { toast } = useToast();
+	const workspace = useContext(WorkspaceTableRowContext);
+	const isDeleting = status.type === "loading";
+
+	useEffect(() => {
+		if (status.type === "error") {
+			toast({
+				variant: "destructive",
+				title: "Failed to delete port.",
+				description: "Unexpected error.",
+			});
+		}
+	}, [status.type, toast]);
+
+	async function _deleteWorkspacePort() {
+		await deleteWorkspacePort(workspace.name, subdomain);
+	}
+
 	return (
-		<Button variant="ghost" size="icon">
-			<Trash2 />
+		<Button
+			disabled={isDeleting}
+			variant="ghost"
+			size="icon"
+			onClick={_deleteWorkspacePort}
+		>
+			{isDeleting ? <LoadingSpinner /> : <Trash2 />}
 		</Button>
 	);
 }