wemake.holiday
Hotels (2.8M directory + live prices), flights, tours, route ideas, travel guides – read-only.
Runs in the cloud✓ wemake.holiday
Whentofly
Overview
Description from the maker (original English)
whentofly: flexible-date economy/business flight search + price-level context for AI agents
PopNx MCP’s three pillars
These three are never merged into one score: opinions, measurements and popularity are different things.
- User voiceiNo reviews yetReviews open together with accounts in a later step
- Our basic checksi1 of 1 passedChecked from public information; code not scanned yet
- UsageiVery new★ –
What you can do with it
We have not written a plain-language summary for this one yet. Below are the facts we read from the registry.
- Connection: Runs in the cloud
- Transport: Streamable HTTP
- Category: Travel, maps & weather
Install
Pick the AI app you use, then copy the settings.
Before you install
- Basic checks: 1 of 1 passed
- Runs on the maker’s server: what you ask it goes through their server.
- The registry lists no key to fill in.
You need
- Runs in the cloudNothing to install; it connects over the internet
Which app do you use?
Pick your app above. We remember it, so next time the button says “Install in …”.
Works in Claude on the web, desktop and mobile:
- Open Settings → Connectors
- Press Add custom connector
- Paste the address below and press Add
- If it asks you to sign in, sign in with the maker
https://whentofly.io/mcp?ch=mcp-registryRun this in your terminal
claude mcp add --transport http whentofly 'https://whentofly.io/mcp?ch=mcp-registry'Or copy the settings yourself
Paste into .cursor/mcp.json in your project, or ~/.cursor/mcp.json
{
"mcpServers": {
"whentofly": {
"url": "https://whentofly.io/mcp?ch=mcp-registry"
}
}
}Your browser asks to open the app, then the app shows the settings and asks you to confirm. Key values are left empty for you to fill in.
Or copy the settings yourself
Paste into .vscode/mcp.json in your project
{
"servers": {
"whentofly": {
"type": "http",
"url": "https://whentofly.io/mcp?ch=mcp-registry"
}
}
}Your browser asks to open the app, then the app shows the settings and asks you to confirm. Key values are left empty for you to fill in.
ChatGPT connects only to servers on the internet:
- Open ChatGPT on the web → Settings → Connectors (Apps)
- Press Create or Add (some plans need Developer mode under Advanced first)
- Paste the address below, give it a name and save
- If it asks you to sign in, sign in with the maker
https://whentofly.io/mcp?ch=mcp-registryMenu names can differ slightly by plan and over time.
Your choice stays on this device in a cookie; no account needed.
These settings are generated from the maker’s registry entry. If the README says otherwise, follow the README.
What it can do
We have not read this server’s tool list yet; we check endpoints in rotation.
Basic checksi
We check information anyone can see; we have not read the code. Checks that do not apply are left out of the count. · Checked Nov 10, 2026
- ✓ Pass
Maker matches the repo
The registry name was verified with the GitHub account dimabalony, which owns the repo
- … Not checked yet
Still maintained
We have not read this repo from GitHub yet
- … Not checked yet
Has a licence
We have not read this repo from GitHub yet
- … Not checked yet
Endpoint responds
Not checked yet; we check endpoints in rotation
- … Not checked yet
Sign-in with OAuth
Not checked yet; we check endpoints in rotation
- … Not checked yet
No hidden instructions in tool descriptions
Not checked yet; we read the tool list when we check the endpoint
Compared with others in Travel, maps & weatheri
- More stars than 0% of the other 1793 servers in this category
- Published to the registry more recently than 23% of the other 1793 servers in this category
- Basic checks equal to or better than 100% of the other 1793 servers in this category
Compared with every active server in this category in the registry. Stars count only when the publisher owns the repo.
Common questions
Is Whentofly safe?
It passed 1 of 1 applicable basic checks. We have not read the code. Before adding a key or token, see what access the server asks for and use a key with only the permissions you need.
What keys or codes does it need?
The registry does not list a required key, though some servers ask you to sign in on first use.
Does it run on my computer or in the cloud?
It runs in the maker’s cloud. Connect over the internet with nothing to install, but what you send passes through the maker’s servers.
Is it still maintained?
The GitHub repo last changed –, and the latest version (1.0.3) reached the registry 3 months ago.
Which apps can use it?
Apps that support MCP, such as Claude Desktop, Claude Code, Cursor and VS Code. It connects by URL, so apps that accept remote MCP servers work too, such as ChatGPT in developer mode.
What can I use instead?
In the same category: wemake.holiday, Agent Data Tools: Everyday data, Warcraft III Map Tools
Alternatives
Servers in the same category from other makers, sorted by stars.
Reading a card:↓ Downloads per weeki★ GitHub starsiThree pillars: reviews · checks · usageiUpdated = latest version published to the registryi
Agent Data Tools: Everyday data
27 tools: weather, time zones, sun and moon, earthquakes, countries. 25 free calls.
Runs in the cloud
README from the maker
Open the README
Copied from the maker’s repo as written. PopNx MCP has not reviewed or endorsed it. HTML, images and scripts are removed. Links lead off this site.
whentofly — flight search for AI agents (MCP)
[whentofly.io](https://whentofly.io) is a flexible-date flight search your AI agent can use directly. Ask your agent *"cheapest round trip from Singapore to Tokyo in October, 5–9 days"* — it searches a whole date window, returns the cheapest real fares with booking links, and tells you where that price sits against the route's usual range.
No API key. No signup. Two tools, hosted remotely — nothing to run locally.
Install
Claude Code
claude mcp add whentofly https://whentofly.io/mcp?ch=githubClaude Desktop / claude.ai — Settings → Connectors → *Add custom connector* → https://whentofly.io/mcp?ch=github
Cursor — add to mcp.json:
{"mcpServers": { "whentofly": { "url": "https://whentofly.io/mcp?ch=github" } } }
Any other MCP client with remote (streamable HTTP) support: point it at https://whentofly.io/mcp.
ChatGPT — use the whentofly Custom GPT (MCP connectors are Claude/Cursor-side for now).
What the tools do
search_locations — turn a place name into an exact identity
Returns typed values you pass straight through to search_flights:
city:SHA— every airport in the Shanghai marketairport:SHA— Hongqiao specifically, not Pudong
Plenty of IATA codes name both an airport and a whole city market — SHA is both — so your agent should ask you which one you meant when more than one result looks plausible. The catalog behind it covers 3,614 airports and 3,465 cities, so small regional airports resolve too.
Already know the code? Pass it. This tool is for the long tail and for the city-vs-airport cases.
search_flights — cheapest round-trip in a flexible window
Give it a month or a date range plus min/max trip length ("5–9 days in October") and it scans every valid depart/return pair, then sorts by price. Booking links on every fare, airline names resolved.
Omit the destination — or say "anywhere" — and you get the cheapest places to fly from your origin instead. "Where can I fly cheapest from Berlin in September?"
Each fare also gets a price level: *good*, *typical*, *high*, or *insufficient data* when the route has no usable band. That says where today's price sits against the route's usual range. It says nothing about which way fares are heading, and it will never tell you to wait.
Example prompts
- "Find the cheapest round trip Singapore → Tokyo in October, 5 to 9 days."
- "Where can I fly the cheapest from Berlin for a week in September?"
- "Is $450 a high price for NYC → Lisbon in November? Check flexible dates."
- "Plan me the cheapest 10–14 day trip to Japan in the next 3 months."
- "Flights from Zhangjiajie — resolve the airport first."
What it doesn't do yet
Premium cabins aren't bookable. Ask for cabin=business or first and you may get route-level price evidence in metadata.route_price_check, but no ranked fare with a booking link. Our bookable fare source covers economy only. We could show you a business price from somewhere else next to a link that goes elsewhere — we'd rather show you nothing than a number the link won't honour.
Prices are cached indicators. Every response carries metadata.freshness so your agent can see how stale a fare is; confirm the final price on the booking page.
Pricing & funding
Ranked for you, not for us. Results are ordered by the cheapest real price we found, whether or not that seller pays us — there's no fee a seller can pay to rank higher.
Free to use, no key. *Some* booking links are affiliate: if you book through one, the partner may pay us a commission, never added to your fare. Each result reports its own monetization, so an agent can tell which is which. Fares come from cached airline-ticket data; always verify the final price on the booking page.
For developers
The same search is available as a plain JSON API — https://whentofly.io/search (docs), plus https://whentofly.io/locations?q=Shanghai for location resolution. This repo hosts documentation for the hosted MCP server; the service itself is closed-source.
Questions / feedback: hello@whentofly.io or open an issue here.