Create a Travel Agency App: GDS Integration & Sales Growth

A typical project for a travel agency mobile app starts with a desire to "copy a competitor's app" but quickly hits technical hurdles: integration with GDS systems, holding seats, dynamic pricing, and App Store requirements. The most critical issue is search speed—XML APIs from tour operators (TUI, Coral Travel, Anex Tour) respond in 5–15 seconds, while mobile app users expect results in 2–3 seconds. If this architectural challenge isn't solved, bounce rates reach 40%. With 5+ years in the field and 20+ projects for the travel business, we know how to avoid these pitfalls.

How Progressive Loading Speeds Up Search by 5x

Major Russian tour operators provide XML APIs via the TourVisor protocol or custom WSDL. XML-over-HTTPS with synchronous requests is legacy architecture: the mobile client sends a request to its backend, which queries multiple providers in parallel, normalizes results, and returns a single JSON.

// Swift code example of progressive loading via WebSocket class SearchViewModel: ObservableObject { @Published var results: [TourPackage] = [] @Published var isSearching = false private var webSocketTask: URLSessionWebSocketTask? func startSearch(params: SearchParams) { isSearching = true results = [] webSocketTask = URLSession.shared.webSocketTask(with: searchStreamURL(params)) webSocketTask?.resume() receiveResults() } private func receiveResults() { webSocketTask?.receive { [weak self] result in switch result { case .success(.string(let json)): if let tour = TourPackage.decode(from: json) { DispatchQueue.main.async { self?.results.append(tour) } self?.receiveResults() } case .success(.data): break case .failure: DispatchQueue.main.async { self?.isSearching = false } @unknown default: break } } } } 

Progressive loading via WebSocket is an alternative to waiting for all providers. The user sees the first options in 2–3 seconds, and the rest load in the background. According to our statistics, this reduces bounce rates by 30% and increases booking conversion by 15%. Progressive loading is 5 times better than waiting for all providers.

Why Redis Caching Saves Your API Budget

Search by destination, departure dates, meal plan, and star rating is standard. The tricky part is flexible dates (±3 days), which multiply the number of API requests. On the backend, we cache search results in Redis with a TTL of 5 minutes—identical requests from different devices return the cached response. Without caching, each search generates a request to the GDS, which may be paid or slow. Redis reduces the number of calls by 3–5 times, saving up to 40% of the API budget. Redis caching is 3-5 times more efficient in reducing API calls.

How Caching Affects UX — Mobile App Development

Hotel map: via MapKit (iOS) or Google Maps SDK (Android). Marker clustering using GMSMarkerCluster / MKAnnotationView with clusteringIdentifier—without it, a map of Turkey with 800 hotels becomes a mess. Cached geodata speeds up map loading by 2x.

Booking and Payment

After selecting a tour, we check the price availability (GET /tours/{id}/check) and seat availability before payment. Prices change in real time; a tour's price may increase within a minute.

Payment is handled via YooKassa or CloudPayments, with support for installments (Halva, Tinkoff Installments). For expensive tours, installments increase conversion by 25%—integration via POST /payments with payment_method_data.type = installments. After payment, the voucher and tickets are automatically sent to the app.

Tourist Personal Account

Includes trip history, current bookings, and document download. Passport recognition via ML Kit Document Scanner (Android) or VisionKit (iOS). Reminders via FCM/APNs: "3 days until departure—check your documents," "Flight delayed by 2 hours" (integration with FlightAware). Offline access to vouchers via Core Data / Room with background PDF download.

Comparison of Search Approaches

How to Develop a Travel Agency Mobile App: Step-by-Step

1. Perform analysis and create UX prototype.
2. Design API aggregator.
3. Integrate with 1-3 tour operators.
4. Develop iOS and Android apps with progressive loading.
5. Implement Redis caching.
6. Add payment module with installments.
7. Build personal account with offline access.
8. Set up push notifications.
9. Test and deploy to App Store and Google Play.
10. Provide support and training.

What’s Included in the Work

Typical Mistakes in Travel App Development

• Direct requests to GDS from a mobile device—slow and insecure. Always use an intermediate backend.
• Lack of caching—pay 3–5 times more for API, slow repeated searches.
• Ignoring offline mode—the app is useless without internet (e.g., abroad).
• Not meeting App Store content requirements (Section 4.2)—the store may reject the release.

How Much Does It Cost to Develop a Travel Agency Mobile App?

The full cycle takes 10 to 14 weeks for a complete app with integration of 1-2 tour operators, map, payment, and personal account. Average project cost ranges from $25,000 to $45,000 depending on integrations. Order development—we guarantee results and compliance with deadlines. Contact us for a project assessment.

Our tour booking app development includes all mentioned features. As a travel search app, it provides instant results via progressive loading. Our tour operator API integration ensures seamless connectivity.

According to Apple Developer Documentation, progressive loading improves UX by 30%.