You have booked a flight over flü and would like to check it in? flü or is a flight search engine that arranges air travel, but does not carry out it itself. Nevertheless, you can check in your booked flight online or reserve your seat.

Online check-in or seat reservation for your flü flight is handled by the airline operating your flight.

Which airline do you fly with?

After booking, you have received your travel confirmation or booking documents via flü These documents will also list the airline that will operate your flight.

When did you receive the travel documents?

As soon as the full payment has been received, you should usually receive your travel documents directly – but no later than seven days before the start of the trip (exception: last-minute bookings, of course). If this is not the case, please contact the Online Service Center .

flü check-in via the airline

In the booking confirmation you will find the airline that operates your flight. Now go to the airline’s online check-in page .

Enter booking details

During the online check-in of the respective airline, you will need the booking number or booking code that you received from flü or the airline after booking your flight. You can then use this code in conjunction with your name to complete the check-in.


If the flight over flü was arranged through a tour operator, some airlines may also require you to enter the tour operator reference number during the check-in process. This number can also be found in your booking documents.

Check-in at the airport

Of course, it is also possible to check in a flight arranged through flü at the airport. Check-in at the airport is the same as if you had booked the flight directly through the airline.

You can find out how check-in at the airport works on our website.

Reserve a seat for flight

If you would like to make a reservation for a seat on your flight, you can also do so quickly and easily online. Here, too, the reservation – as well as the online check-in – takes place via the website of the booked airline .

Please note that the availability and ability to reserve seats depends on the airline, and additional fees may apply for special seat requests.

We recommend that you take care of reserving your desired seat well in advance to ensure that you can reserve the seat that suits your needs and desires.

Luggage at flü check-in

When it comes to baggage, the guidelines of the booked airline are also decisive.

Normally, your baggage policy will be noted on your travel documents. However, to make the process easier for you, we have compiled the carry-on and baggage policies of the major airlines on our website. This will ensure that you take the right luggage with you on your trip and avoid unpleasant surprises at the airport.

About flü offers a wide range of flight offers from over 550 airlines – be it for scheduled, low-cost, charter or low-cost flights as well as for remaining airports. Hotel reservations, rental cars and other travel specials can also be booked through

In addition to the practical booking options, also offers a travel blog with interesting information about the flight sector.

The Czech investment company Rockaway Capital SE is the owner of the platform. This company also owns platforms such as:,,,,,, and TravelViva.