diff --git a/src/data/slice.js b/src/data/slice.js
index d6348da6..39c038ed 100644
--- a/src/data/slice.js
+++ b/src/data/slice.js
@@ -56,6 +56,7 @@ export const examSlice = createSlice({
         ping_interval: null,
         attempt_code: '',
         external_id: '',
+        use_legacy_attempt_api: true,
       },
       type: '',
     },
diff --git a/src/instructions/proctored_exam/ProctoredExamInstructions.test.jsx b/src/instructions/proctored_exam/ProctoredExamInstructions.test.jsx
index 1994cc11..063ad89f 100644
--- a/src/instructions/proctored_exam/ProctoredExamInstructions.test.jsx
+++ b/src/instructions/proctored_exam/ProctoredExamInstructions.test.jsx
@@ -1,11 +1,11 @@
 import '@testing-library/jest-dom';
 import { Factory } from 'rosie';
 import React from 'react';
-import { fireEvent } from '@testing-library/dom';
+import { fireEvent, waitFor } from '@testing-library/dom';
 import Instructions from '../index';
 import { store, getExamAttemptsData } from '../../data';
 import { submitExam } from '../../data/thunks';
-import { render, screen } from '../../setupTest';
+import { initializeMockApp, render, screen } from '../../setupTest';
 import ExamStateProvider from '../../core/ExamStateProvider';
 import {
   ExamType,
@@ -27,6 +27,11 @@ store.subscribe = jest.fn();
 store.dispatch = jest.fn();
 
 describe('SequenceExamWrapper', () => {
+  beforeEach(() => {
+    initializeMockApp();
+    jest.clearAllMocks();
+  });
+
   it('Start exam instructions can be successfully rendered', () => {
     store.getState = () => ({
       examState: Factory.build('examState', {
@@ -164,6 +169,7 @@ describe('SequenceExamWrapper', () => {
   it('Shows correct instructions when attempt status is ready_to_submit ', () => {
     const attempt = Factory.build('attempt', {
       attempt_status: ExamStatus.READY_TO_SUBMIT,
+      use_legacy_attempt_api: true,
     });
     store.getState = () => ({
       examState: Factory.build('examState', {
@@ -190,6 +196,39 @@ describe('SequenceExamWrapper', () => {
     expect(submitExam).toHaveBeenCalled();
   });
 
+  it('Initiates an LTI launch in a new window when the user clicks the submit button', async () => {
+    const windowSpy = jest.spyOn(window, 'open');
+    windowSpy.mockImplementation(() => ({}));
+    const attempt = Factory.build('attempt', {
+      attempt_status: ExamStatus.READY_TO_SUBMIT,
+      use_legacy_attempt_api: false,
+      attempt_id: 1,
+    });
+    store.getState = () => ({
+      examState: Factory.build('examState', {
+        activeAttempt: attempt,
+        exam: Factory.build('exam', {
+          is_proctored: true,
+          type: ExamType.PROCTORED,
+          attempt,
+        }),
+      }),
+    });
+
+    const { queryByTestId } = render(
+      <ExamStateProvider>
+        <Instructions>
+          <div>Sequence</div>
+        </Instructions>
+      </ExamStateProvider>,
+      { store },
+    );
+
+    expect(queryByTestId('proctored-exam-instructions-title')).toHaveTextContent('Are you sure you want to end your proctored exam?');
+    fireEvent.click(queryByTestId('end-exam-button'));
+    await waitFor(() => { expect(windowSpy).toHaveBeenCalledWith('http://localhost:18740/lti/end_assessment/1', '_blank'); });
+  });
+
   it('Instructions are shown when attempt status is verified', () => {
     store.getState = () => ({
       examState: Factory.build('examState', {
diff --git a/src/instructions/proctored_exam/SubmitProctoredExamInstructions.jsx b/src/instructions/proctored_exam/SubmitProctoredExamInstructions.jsx
index ca99f02a..1413d04d 100644
--- a/src/instructions/proctored_exam/SubmitProctoredExamInstructions.jsx
+++ b/src/instructions/proctored_exam/SubmitProctoredExamInstructions.jsx
@@ -1,4 +1,5 @@
 import React, { useContext } from 'react';
+import { getConfig } from '@edx/frontend-platform';
 import { FormattedMessage } from '@edx/frontend-platform/i18n';
 import { Button } from '@edx/paragon';
 import ExamStateContext from '../../context';
@@ -11,8 +12,18 @@ const SubmitProctoredExamInstructions = () => {
     exam,
     activeAttempt,
   } = state;
-  const { type: examType } = exam || {};
+  const { type: examType, attempt } = exam || {};
   const { exam_display_name: examName } = activeAttempt;
+  const examHasLtiProvider = !attempt.use_legacy_attempt_api;
+  const submitLtiAttemptUrl = `${getConfig().EXAMS_BASE_URL}/lti/end_assessment/${attempt.attempt_id}`;
+
+  const handleSubmitClick = () => {
+    if (examHasLtiProvider) {
+      window.open(submitLtiAttemptUrl, '_blank');
+    } else {
+      submitExam();
+    }
+  };
 
   return (
     <>
@@ -48,7 +59,7 @@ const SubmitProctoredExamInstructions = () => {
           />
         </p>
       )}
-      <Button variant="primary" onClick={submitExam} className="mr-2" data-testid="end-exam-button">
+      <Button variant="primary" onClick={handleSubmitClick} className="mr-2" data-testid="end-exam-button">
         <FormattedMessage
           id="exam.SubmitProctoredExamInstructions.submit"
           defaultMessage="Yes, end my proctored exam"