diff --git a/apps/webapp/app/services/runsRepository/runsRepository.server.ts b/apps/webapp/app/services/runsRepository/runsRepository.server.ts
index b1a5b79ab4c..032852af6d5 100644
--- a/apps/webapp/app/services/runsRepository/runsRepository.server.ts
+++ b/apps/webapp/app/services/runsRepository/runsRepository.server.ts
@@ -361,13 +361,22 @@ export async function convertRunListInputOptionsToFilterRunsOptions(
     period: undefined,
   };
 
-  // Convert time period to ms
-  const time = timeFilters({
-    period: options.period,
-    from: options.from,
-    to: options.to,
-  });
-  convertedOptions.period = time.period ? (parseDuration(time.period) ?? undefined) : undefined;
+  // Convert time period to ms.
+  // Explicit run-id selections target specific, already-existing runs, so we
+  // don't apply a default time bound (which could otherwise exclude a selected run).
+  const hasExplicitRunIds = Boolean(options.runId && options.runId.length > 0);
+  const hasExplicitTimeFilter = Boolean(
+    options.period !== undefined || options.from !== undefined || options.to !== undefined
+  );
+
+  if (!hasExplicitRunIds || hasExplicitTimeFilter) {
+    const time = timeFilters({
+      period: options.period,
+      from: options.from,
+      to: options.to,
+    });
+    convertedOptions.period = time.period ? (parseDuration(time.period) ?? undefined) : undefined;
+  }
 
   // Cross-DB resolution: BatchTaskRun is a RUN-OPS table. A run-ops batch resident on the
   // dedicated run-ops DB must resolve via the store's NEW->LEGACY probe — a single control-plane
diff --git a/apps/webapp/test/runsRepositoryConvert.runIds.test.ts b/apps/webapp/test/runsRepositoryConvert.runIds.test.ts
new file mode 100644
index 00000000000..0b7c28ae07d
--- /dev/null
+++ b/apps/webapp/test/runsRepositoryConvert.runIds.test.ts
@@ -0,0 +1,114 @@
+import { describe, expect, it, vi } from "vitest";
+
+// Prevent run-store / db / env singletons from constructing at import
+vi.mock("~/db.server", () => ({}));
+vi.mock("~/v3/runStore.server", () => ({ runStore: {} }));
+vi.mock("~/env.server", () => ({ env: {} }));
+
+import { convertRunListInputOptionsToFilterRunsOptions } from "~/services/runsRepository/runsRepository.server";
+
+describe("convertRunListInputOptionsToFilterRunsOptions with explicit runIds vs filters (#5110)", () => {
+  const mockPrisma = {} as any;
+  const mockStore = {} as any;
+
+  it("leaves period undefined when explicit runIds are supplied without time filters", async () => {
+    const result = await convertRunListInputOptionsToFilterRunsOptions(
+      {
+        organizationId: "org_123",
+        projectId: "proj_123",
+        environmentId: "env_123",
+        runId: ["run_recent", "run_older_than_7_days"],
+      },
+      mockPrisma,
+      mockStore
+    );
+
+    // Period must remain undefined so runs older than 7 days are not silently excluded (#5110)
+    expect(result.period).toBeUndefined();
+    expect(result.runId).toEqual(["run_recent", "run_older_than_7_days"]);
+  });
+
+  it("applies the default 7d period when no explicit runIds are supplied (filter-only)", async () => {
+    const result = await convertRunListInputOptionsToFilterRunsOptions(
+      {
+        organizationId: "org_123",
+        projectId: "proj_123",
+        environmentId: "env_123",
+        statuses: ["COMPLETED_SUCCESSFULLY"],
+      },
+      mockPrisma,
+      mockStore
+    );
+
+    expect(result.period).toBe(7 * 24 * 60 * 60 * 1000); // 604800000 ms
+  });
+
+  it("applies the default 7d period when runId is an empty array", async () => {
+    const result = await convertRunListInputOptionsToFilterRunsOptions(
+      {
+        organizationId: "org_123",
+        projectId: "proj_123",
+        environmentId: "env_123",
+        runId: [],
+      },
+      mockPrisma,
+      mockStore
+    );
+
+    expect(result.period).toBe(7 * 24 * 60 * 60 * 1000);
+  });
+
+  it("honors explicit period when supplied alongside runIds", async () => {
+    const result = await convertRunListInputOptionsToFilterRunsOptions(
+      {
+        organizationId: "org_123",
+        projectId: "proj_123",
+        environmentId: "env_123",
+        runId: ["run_1"],
+        period: "30d",
+      },
+      mockPrisma,
+      mockStore
+    );
+
+    expect(result.period).toBe(30 * 24 * 60 * 60 * 1000);
+    expect(result.runId).toEqual(["run_1"]);
+  });
+
+  it("honors explicit from/to when supplied alongside runIds without defaulting period", async () => {
+    const from = Date.now() - 30 * 24 * 60 * 60 * 1000;
+    const to = Date.now();
+    const result = await convertRunListInputOptionsToFilterRunsOptions(
+      {
+        organizationId: "org_123",
+        projectId: "proj_123",
+        environmentId: "env_123",
+        runId: ["run_1"],
+        from,
+        to,
+      },
+      mockPrisma,
+      mockStore
+    );
+
+    expect(result.period).toBeUndefined();
+    expect(result.from).toBe(from);
+    expect(result.to).toBe(to);
+    expect(result.runId).toEqual(["run_1"]);
+  });
+
+  it("honors custom period on filter-only queries", async () => {
+    const result = await convertRunListInputOptionsToFilterRunsOptions(
+      {
+        organizationId: "org_123",
+        projectId: "proj_123",
+        environmentId: "env_123",
+        period: "14d",
+      },
+      mockPrisma,
+      mockStore
+    );
+
+    expect(result.period).toBe(14 * 24 * 60 * 60 * 1000);
+  });
+});