Vacation season arrives each summer. Families and friends pack suitcases and travel to beaches, mountains, or bustling cities. They seek rest, adventure, and time together.

People plan vacations by researching destinations and comparing options online. They book flights, hotels, and tours using online booking services. These platforms offer convenience, real-time availability, and secure reservations to ensure a smooth travel planning experience.

According to NerdWallet's 2025 summer travel survey, more than two in five Americans (44%) plan to take a vacation this summer that requires a flight or hotel stay, which equates to over 117 million travelers. That participation rate was slightly below last summer's 45%, when nearly 118 million Americans took similar trips.

For 2025, those summer travelers are expected to spend an average of $3,861 per person—over $452 billion in total—primarily on flights and hotel stays, with remaining budgets earmarked for dining, local transportation, and activities such as tours and attractions.

As we do annually, we at WebSitePulse will closely monitor 9 of the most popular U.S. travel booking websites for their performance and uptime during the busiest booking period — from May 15 to June 30, 2025 — and report on their efficiency.

The WebSitePulse Performance Reports will measure the websites' uptime and response time as the most critical metrics for any web-based operation's availability and reliability, which are crucial for the End Users' overall online experience. Web transactions will be measured every 15 minutes simultaneously from 4 different monitoring locations.

In-depth analytical information is also collected and stored in the WebSitePulse system for future reference.