Here’s how to book your flight from Sofia to Denver with confidence and get the best price:

• Best Price Search: Simply search for your destination, choose the best offer in the monthly overview, and book at the lowest price.
• Best Price Alert: Get notified about the best offers — simply sign in with your Travel ID or email address.
• Price Guarantee: Until all travel details have been finalized, you can lock in the best price for your reservation with price guarantee for up to 48 hours.
• More about the Price Guarantee
• Student fares: With verified student status, you may be eligible for a discounted fare on your flight from Sofia to Denver.
• More about student fares

Prices for flights from Sofia to Denver start at 842 EUR at lufthansa.com.

You have several upgrade options: Premium Economy Class, Business Class or First Class. Find out more about each option here.

Premium Economy Class is our extra comfortable travel class, perfect for long-haul flights. Enjoy numerous advantages such as extra wide seating with increased reclining for a relaxing flight.

You can upgrade to Business Class online in "My Bookings." Our system automatically checks which flights can be upgraded. See how to do this here. You can book upgrades up to 360 days before your flight and until 24 hours before departure.

Yes, you can use miles to pay for upgrades. You can find more information about this here.

An upgrade requires several things, depending on the kind you would like to book. The main thing is that there must be free seats in the higher class. There is also a time limit: You can book an upgrade from 360 days before your flight until 24 hours before departure. You can find all the details here.

No, the fare conditions of your original ticket still apply after the upgrade. This means the rules for changing your booking, getting a refund, and baggage do not change. You still get the same baggage allowance as your original ticket.

We offer a selection of snacks and high-quality meals that vary depending on your travel class and flight duration. For example, you can purchase fresh snacks on Economy Class flights that are longer than one hour. On long-haul flights, complimentary meals and beverages are provided even in Economy Class. Learn more about our onboard menus.

Yes, our Lufthansa Inflight Entertainment offers excellent onboard entertainment. A wide selection of the latest movies, music, games, and more is available on long-haul flights to make your journey more enjoyable. What's more, free digital magazines and newspapers are available as eJournals on all Lufthansa flights. Learn more in our online inflight entertainment guide.

Baggage allowance refers to the amount of baggage you can bring with you at no extra cost. The size, weight and number of bags or suitcases depends on the fare you have booked, the flight route and your Miles & More status.

The free baggage allowance and applicable fees for additional baggage depend on your route, flight class and the fare. Use our baggage calculator to find out how much baggage you are allowed to bring with you on your flight and how you can add additional baggage.

With Lufthansa’s online check-in, you can conveniently check in as early as 23 hours before departure, choose your seat, and either print your boarding pass or have it sent to your smartphone. Online check-in is available on our website and in the Lufthansa App. For more information, visit our online check-in section.

If a flight is cancelled, we automatically rebook all affected passengers. The new flight connection will then be displayed under "My bookings". If you need help, our Lufthansa Chat Assistant Elisa will be happy to assist you.