Go to the airline’s website or app. If they offer online check-in for your flight, you’ll usually only need their reservation number (PNR) and your name or destination.
You can find the PNR in the itinerary detail in your trip page or in the Kiwi.com app.
Can’t access your booking with the airline?
You might not be able to check in online or log in to your booking with some airlines, for example Ryanair. This is because they require more details for online check-in and we book the trips using agency accounts or virtual contact details.