--- title: "Approval workflow" description: "A travel approval workflow decides which bookings need sign-off and who approves them. How approvals work, where they slow teams down and how to set them up." canonical: https://engine.com/glossary/approval-workflow updated: 2026-10-30 author: "Engine Editorial" --- # Approval workflow A travel approval workflow is the set of rules that decides which bookings need sign-off, who approves them, how approvers are notified and how fast they need to answer. Also called: travel approval process, pre-trip approval, booking approval Updated October 30, 2026 by Engine Editorial ## What is a travel approval workflow? A travel approval workflow decides which bookings wait for a yes before they go through. This cheat sheet covers how to think about one, what happens to an out-of-policy booking and where workflows go wrong. The detail is further down. ### How to think about it - **Approve the exceptions.** Many teams ask for approval only when a booking breaks the travel policy, so bookings inside policy go through with no sign-off. - **Approve at booking time.** Finding an out-of-policy hotel on the card statement three weeks later is too late to stop it. - **Pick the right approver.** Typically a department head or travel administrator, alerted by email or text. - **A broken rule has three outcomes.** Block the booking, allow it with a reason or require approval. ### What happens to an out-of-policy booking 1. **The policy is set.** An admin sets rules like a nightly rate cap by location or a minimum star rating, and decides what happens when a booking breaks one. 2. **The traveler books.** Bookings inside the policy go through with no approval needed. 3. **A request goes out.** The traveler picks the out-of-policy option anyway, gives a reason and submits an approval request from the booking flow. 4. **The approver decides.** An approver gets an email or text, reviews the current price and approves and books, or declines with a reason. 5. **The traveler hears back.** The traveler gets the decision by email. Approved bookings show on the Trips page. ### Where it goes wrong - **Approving everything.** When every $120 room needs a sign-off, crews wait and the requests that need real judgment get buried. - **Approving after the fact.** A policy enforced on the card statement only tells you what already happened. - **No backup approver.** Requests stall when the only approver is unavailable. - **No reason on the request.** The approver has to go back and forth with the traveler before deciding. ## Ways to handle an out-of-policy booking | Setting | What the traveler sees | Best for | | --- | --- | --- | | Block it | The booking can't go through | Hard limits you never want broken | | Allow with a reason | The traveler books and explains why | Exceptions you want visibility on | | Allow with approval | The booking waits for an approver | Exceptions that need a decision before booking | ## How it works on Engine Admins set [travel policies](https://engine.com/corporate-travel-policies) and assign them to all members, individual members or departments. Lodging rules include nightly rate caps by location and a star-rating floor. Each rule can block the booking, allow it with a reason or require approval. With [Engine Approvals](https://engine.com/features/engine-approvals) on, out-of-policy lodging, flight and rental-car requests go to company admins by default, or to selected admins and department managers, by email or text. Approve and Book completes the reservation at the current price, and requests expire after 24 hours, or at the end of the reservation day for same-day bookings. ## Approvals only when a booking breaks policy Set nightly rate caps by location on Engine and route out-of-policy bookings to the admins or managers you choose. Free to use. [Get started](https://engine.com/sign-up) ## Questions ### Does every business trip need approval? Not always. Of 25 published travel policies Engine reviewed, 84% require pre-approval before travel, but the smart ones only require it above a threshold, like a hotel above the nightly cap. Approving every routine booking slows crews down and buries the requests that need real judgment. ### Who should approve travel bookings? Typically a department head or travel administrator who understands both budget and traveler needs. Set a response deadline, such as 24 hours, and name a backup approver for when the main one is unavailable. ### What's the difference between pre-trip approval and expense approval? Pre-trip approval happens at booking, before money is spent. Expense approval happens after the spend, when the expense is reviewed for reimbursement. Only pre-trip approval can stop an overspend before it happens. ### What should an approval request include? The booking, the cost, which policy rule it breaks and the traveler's reason. With that context, the approver can decide without back-and-forth messages. ## Go deeper - [Travel approval workflows that give you control](https://engine.com/blog/travel-approval-workflows-that-give-control) - [Engine travel policies](https://engine.com/corporate-travel-policies) - [Corporate travel policy template](https://engine.com/templates/corporate-travel-policy-template) ## Sources 1. Engine, "Travel Approval Workflows That Give You Control Without Slowing Teams Down," https://engine.com/blog/travel-approval-workflows-that-give-control, accessed October 30, 2026. 2. Engine, "Book Business Travel with Built-In Travel Policies," https://engine.com/corporate-travel-policies, accessed October 30, 2026. 3. Engine, "Engine Approvals for Out-of-Policy Travel," https://engine.com/features/engine-approvals, accessed October 30, 2026. 4. Engine, "Company Travel Policy Enforcement," https://engine.com/features/travel-policy-enforcement, accessed October 30, 2026. 5. Engine, "Corporate Travel Policy Template," https://engine.com/templates/corporate-travel-policy-template, accessed October 30, 2026.