Add a checked bag to a Kiwi.com booking

1. Sign in to your Kiwi.com account and open the booked trip.
2. Look at the baggage options Kiwi.com offers for the trip; their prices depend on the carriers and the conditions of that booking.
3. Choose the bag for the right passenger and pay. The Kiwi.com website sells baggage for the whole itinerary only, so a bag for one leg means writing to Kiwi.com customer support.
4. If no checked bag is offered, read the reason: self-transfers with layovers usually under 2 hours and hidden city itineraries are No-checked-bag itineraries on Kiwi.com.
5. Every change of plan repeats the same visit. Missing the 36-hour cutoff leaves only the carrier or the airport desk, where many carriers charge more or limit the pieces.

Add one 20 kg checked bag for me to my Barcelona trip. Show me the price first, and stop if the trip is a self-transfer that does not allow checked bags.

1. 01

   Rule out trips that cannot take a bag

   Before any price, the agent reads get_trip. A hidden city routing or a tight self-transfer stops the run with the reason, since Kiwi.com also advises against buying bags from the carrier for these trips.

2. 02

   Check the clock

   The agent compares the first departure with the current time. Inside 36 hours it does not try to buy; it says the Kiwi.com option is closed and the bag now goes through the carrier or the airport.

3. 03

   Match the request to one option

   get_baggage_options lists pieces per passenger. The agent matches "20 kg, checked, for Ana" to a single option and shows its price. If only a heavier or two-piece option exists, it asks before choosing it rather than taking the closest one.

4. 04

   Buy once, with your OK

   add_baggage charges your payment method, and Kiwi.com will not remove the bag or move it to another traveler later. The confirmation names passenger, bag and price. A call that timed out is never repeated until get_trip shows whether the first one went through.

5. 05

   Send part-trip bags to support

   For a bag on only one leg the agent does not buy the whole-itinerary option. It drafts a message for Kiwi.com customer support with the booking number and the leg instead.

PRG-BCN-PRG (512834907), Ana Lopez, departs 14 Nov at 07:20.
Options: checked bag 20 kg, EUR 64.00; cabin bag 10 kg, EUR 38.00.
Added after your OK: checked bag 20 kg for Ana Lopez, EUR 64.00, on both flights.
OPO-NCE (447019236): no bag options, the outbound is a self-transfer with a 1h 20m layover.

• Kiwi.com sells extra baggage until 36 hours before the trip; later, a bag can only be added through the carrier or at the airport, depending on the carrier.
• Kiwi.com offers bags that meet the requirements of every carrier in the itinerary, while size and weight limits differ from airline to airline when you buy from a carrier directly.
• Kiwi.com may add a processing fee to baggage bought after booking, depending on the service package of the trip.
• A bag on a Kiwi.com booking cannot be removed or moved to another passenger, though an upgrade to more pieces or kilos is possible where the carriers offer it.
• When a carrier system fails and Kiwi.com emails you to add the bag at the airport, Kiwi.com refunds the full airport fee, even above the online price, once you submit the receipt under Refunds and cancellations.

add_baggage asks for your OK by default. To run it on a schedule without you, switch confirmation off for that tool in your dashboard.

Sources: Kiwi.com Help: how to add or change baggage · Kiwi.com Help: why can't I add baggage to my itinerary · Kiwi.com Help: adding baggage with the carrier or at the airport · Kiwi.com Help: what if I was asked to add baggage at the airport

curl https://cotlet.dev/api/v1/kiwi-com/add_baggage \
  -H "Authorization: Bearer $COTLET_API_KEY" \
  -H "Content-Type: application/json" \
  -d '{"trip_id":"512834907","bag_option_id":"bo_chk20_p1"}'

{
  "trip_id": "512834907",
  "status": "added",
  "bag": {
    "bag_option_id": "bo_chk20_p1",
    "description": "Checked bag, 20 kg",
    "passenger_id": "p1"
  },
  "price": {
    "amount": 64,
    "currency": "EUR"
  }
}

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

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