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How to compare flight fares across a date range from your assistant with Invisible Playwright MCP

Have your assistant check each date in a range on a booking site and report the cheapest fare per day.

  • Top pick
  • Work and operations
  • Intermediate
  • 30 minutes
  • From the README
  • Claude Code
  • Codex
  • Gemini CLI

Authorization notice. Invisible Playwright MCP is dual-use. Only use it on software, sites and systems you own or have explicit permission to test.

Who it is forA traveller or travel planner who wants a day-by-day fare comparison, and whose assistant needs a real browser because the booking page uses a calendar widget and no API.

The problemChecking many dates by hand on a booking site takes a long time, and a plain scripted browser may be blocked or fail on calendar widgets.

The outcomeA list of the cheapest fare for each date in the chosen range, with any date that has no availability stated plainly rather than guessed.

What you need first

  • uv installed, using the install command for your operating system from the README
  • An OpenRouter API key for the standalone web UI and for model calls
  • An MCP-capable assistant such as Claude Code, Codex or Gemini CLI, for the MCP route
  • Permission to automate the sites you point it at, and a read of their terms

Steps

  1. Install uv for your system with the README command: curl -LsSf https://astral.sh/uv/install.sh | sh on Linux, or the PowerShell command on Windows.
  2. Run claude plugin marketplace add feder-cr/invisible_playwright_mcp and then claude plugin install invisible-playwright-mcp@feder-cr in Claude Code.
  3. Or, in Codex, run codex plugin marketplace add feder-cr/invisible_playwright_mcp and then codex plugin add invisible-playwright-mcp@feder-cr.
  4. Give the assistant your route, passengers, cabin and date range, and ask it to click each day in the calendar widget rather than typing dates.
  5. Read the returned fares yourself and confirm any booking manually, since the README says not to submit anything a human has not read.

Prompt for your agent

Using the invisible_playwright_mcp server from feder-cr/invisible_playwright_mcp, open <booking-site-url> and check the cheapest economy fare for one adult, one checked bag, from <origin> to <destination>, for each date from <start-date> to <end-date>, clicking the days in the calendar widget one at a time. Expected output: one line per date with the cheapest fare or the words no availability. Verify that no booking was submitted.

Caveat. The README says the browser is invisible to anti-bots, but it does not promise any particular site will accept it, so check each result against the site itself.

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