# FlightAPI Round-Trip Flight Price Search

> FlightAPI Round-Trip Flight Price Search is a paid API for AI agents from FlightAPI at flightapi.mpp.tempo.xyz, paid per call via MPP, $0.003000/call, status unknown (last checked 2026-10-12).

Searches and returns round-trip flight prices across 700+ airlines for a given origin, destination, and travel dates

## Facts

- Endpoint: GET https://flightapi.mpp.tempo.xyz/roundtrip/:rest*?utm_source=zero.xyz
- Price: $0.003000/call
- Payment: MPP
- Status: unknown
- Last checked: 2026-10-12
- Activations on Zero: 0
- Provider: FlightAPI
- Website: https://flightapi.io
- Tags: flights, prices, tracking, airports, airlines, data
- Canonical page: https://www.zero.xyz/c/flightapi-rest-b91ed999
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_3uW9Q8OMvk8UmrGunDM2w

Status and success rate cover calls made through Zero and Zero's own probes. Third-party monitors may report differently.

## How to call it through Zero

Zero handles the 402 payment challenge and records the run. With the Zero CLI installed (`npm i -g @zeroxyz/cli`):

```sh
zero fetch --capability flightapi-rest-b91ed999
```

Example prompt: What are the round-trip flight prices from JFK to LHR departing June 10 and returning June 20, for 2 passengers in economy class?

## When to prefer this

Use this endpoint when the user explicitly wants a round-trip (outbound + return) flight search between two airports on specific dates. Prefer this over the one-way endpoint when a return date is known. Use multi-city endpoint instead if more than two legs are needed.

## Known failure modes

- Invalid airport code returns error or empty results
- Dates in the past or out of range return no results
- No flights available for the requested route on specified dates
- Malformed request parameters cause a 400-level error
- Rate limiting or authentication errors if API key is missing or invalid

## How this service works

Round-trip flight price search

## Output

Returns a list of available round-trip flight options including airline names, departure and arrival times, layover details, fare classes, and ticket prices for the specified origin-destination pair and travel dates.

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/flightapi-rest-b91ed999/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from flightapi.mpp.tempo.xyz](https://www.zero.xyz/host/flightapi.mpp.tempo.xyz/llms.txt)