Kiwi.com online check-in: add travel documents and get boarding passes

1. Sign in at kiwi.com/user and open the trip from the list of your bookings.
2. On the Kiwi.com trip page, add the travel document details the airlines require, usually the ID or passport number and its expiry date, for every passenger and no later than 24 hours before departure.
3. Wait for the airline to open online check-in, usually one or two days before the flight; Kiwi.com then checks you in on every flight of the itinerary and notifies you.
4. Open the boarding pass in the Kiwi.com app, which also works offline, or tap below the mobile pass to download the original PDF for printing.
5. Repeat this for every booking and every traveler. A trip booked weeks ago without details is easy to forget, and after the cutoff you check in with each airline yourself.

Every morning, check my upcoming Kiwi.com trips. Add my saved passport details to any trip that still asks for them, and save the boarding passes to ~/Travel once they arrive.

1. 01

   Find the trips at risk

   The agent calls list_trips and keeps the upcoming trips flagged as missing documents. A trip leaving in under 24 hours goes to the top of the report as "check in with the airline", because Kiwi.com no longer takes details for it and adding them would change nothing.

2. 02

   Match each traveler to a document

   get_trip names every passenger and the fields still open. The agent fills a passenger only from a document you saved for that exact name. A companion with nothing on file is listed for you instead of guessed, and a passport that expires before the return flight is held back with a note.

3. 03

   Send the details with your OK

   add_travel_documents hands passport data to the airlines, so each call waits for your OK unless you switched that off. The agent sends one traveler at a time and reads get_trip again to confirm that nobody still appears as needing details.

4. 04

   Collect passes when they exist

   On flight days the agent calls get_boarding_passes. An empty list while the airline has not opened check-in is normal, so it tries again on the next run instead of raising an alarm. Ryanair flights get checked until 2 hours before departure.

5. 05

   Call out a failed check-in

   If a non-Ryanair flight still has no pass 6 hours before departure, the agent tells you to check in with the airline now and to keep the receipt of any airport check-in fee.

Checked 4 upcoming trips on 12 Oct 2026.
PRG-BCN-PRG (512834907), 14 Nov: passport details added for Ana Lopez after your OK. Waiting for the airline to open check-in.
PRG-BER (734120655), 2 Dec: details complete for both passengers.
VIE-DUB (618220431), 13 Oct: boarding pass for Ana Lopez saved to ~/Travel/2026-10-13-VIE-DUB.pdf.
LIS-MAD (902114378), leaves in 19 hours: details were never added, so Kiwi.com will not check you in. Check in with the airline today.

• Kiwi.com accepts travel document details on the trip page until 24 hours before departure; after that cutoff you check in with each airline directly, online or at the airport.
• Kiwi.com does not refund an airport check-in fee, which some low-cost airlines set as high as €55 per passenger, when you missed its 24-hour deadline. When you gave your details on time and its check-in failed, Kiwi.com reimburses that fee against the receipt.
• Kiwi.com aims to deliver boarding passes no later than 6 hours before departure, with Ryanair as the exception at up to 2 hours before.
• Kiwi.com online check-in asks for the identification number and its expiry date; visas are shown at the airport and are not entered during online check-in.
• When you check in with an airline yourself instead of through Kiwi.com, the boarding pass comes from that airline, not from Kiwi.com.

add_travel_documents asks for your OK by default. To run it daily without you, switch confirmation off for that tool in your dashboard.

Sources: Kiwi.com Help: how Kiwi.com online check-in works · Kiwi.com Help: how will I get my boarding pass · Kiwi.com Help: what if I miss Kiwi.com's check-in service · Kiwi.com Help: what documents do I need for check-in

curl https://cotlet.dev/api/v1/kiwi-com/add_travel_documents \
  -H "Authorization: Bearer $COTLET_API_KEY" \
  -H "Content-Type: application/json" \
  -d '{"trip_id":"512834907","passenger_id":"p1","details":{"document_number":"XK1234567","expiry_date":"2031-04-18"}}'

{
  "trip_id": "512834907",
  "passenger_id": "p1",
  "status": "saved",
  "check_in": "waiting for the airline to open"
}

MCP: add https://cotlet.dev/mcp/v1 with the same key; the tool is kiwi-com_add_travel_documents. Example data.

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