Connection Time Between Frankfurt and Budapest on Lufthansa

I've made 90 minute connections several times at FRA, which of course is no guarantee you will. But the airport is efficient, and as long as you follow the signs and don't exit into baggage claim when you mean to go to your connecting flight, you'll be fine. I actually made this mistake, and was still fine. And as long as your flights are all on one ticket, you will be put on the next available flight to Budapest if your arriving flight from Denver is late (if you're on separate tickets, however, you're on your own if there are any problems).

I've changed in Frankfurt a number of times when coming out of Budapest. It's a pretty efficient airport but on my last two flights it was a pretty good walk to the next gate. My rule is nothing less than 2 hours, but I have an hour and ten minute lay over in about three weeks on the return flight. HA!!! I can hardly wait. If I miss it then I spend the night in Frankfurt.

Transferring to another Flight / Terminal: If you do not yet have a boarding card for your connecting flight, you can obtain one at the gate or at the Transfer Desk in the B Concourse of Terminal 1. U.S. Arrivals are being processed at Area A where they go through passport control only ; US departures use the Z gates. If you need to transfer inside Terminal 1between B gates (T1B) and A or Z gates (T1A), you can use transfer tunnel outside security, or the SkyLine train inside security, which leaves every 2-3 mins. An escalator from lower level A gates connects to upper level Z gates.
If you need to transfer between the two terminals, use the free SkyLine train which connects - inside the secured area - A & B gates & stops between D & E gates, and comes around every two minutes. To connect from level 1 baggage claim A, B & C to E & D, use the shuttle bus outside. http://www.ifly.com/frankfurt-airport/terminal-map

Lufthansa only uses Terminal 1, so you don't need to worry about going between terminals. Have a look on the Arrival and Departure boards of the Frankfurt airport to see which gates your flights usually use. It doesn't guarantee anything, but it will give you an idea. Look at the airport map to see where these gates are. http://www.frankfurt-airport.com/content/frankfurt_airport/en.html

That should be sufficient if on time. We have made tighter connections through Frankfurt in the past. It is helpful to seats on the left side of the plane and as close to the exit door as possible. We missed a tight connection once because the plane was 20 mins late and we sat in the far right corner of the plane which meant that we were nearly the last ones off after 20 minutes.