# eta(request, callback) Retrieves estimated arrival times to up to 10 destinations from a single starting point. ``` eta( request: EtaRequestOptions, callback: (error: Error | null, result: EtaResponse | null) => void, ): Promise; ``` ## Parameters `request` An [`EtaRequestOptions`](/documentation/MapKitJS/EtaRequestOptions) object that specifies details for the server to provide estimated arrival times at one or more destinations. `callback` A callback function that receives the estimated time response object, returned asynchronously. ## Return Value A promise that resolves with an [`EtaResponse`](/documentation/MapKitJS/EtaResponse) on success. ## Discussion To get a set of estimated arrival times, provide an [`EtaRequestOptions`](/documentation/MapKitJS/EtaRequestOptions) object when you call the [`eta(request, callback)`](/documentation/MapKitJS/Directions/eta1) method. You can provide up to 10 destinations. The server returns an error if you request more than 10 destinations in a single request. Estimated times are returned asynchronously via a callback function. MapKit JS invokes the callback function with two arguments, `error` on failure and `data` on success. `error` contains an error code and a text description of the error. `data` is an [`EtaResponse`](/documentation/MapKitJS/EtaResponse) object. --- Copyright © 2026 Apple Inc. All rights reserved. | [Terms of Use](https://www.apple.com/legal/internet-services/terms/site.html) | [Privacy Policy](https://www.apple.com/privacy/privacy-policy)