My wife and I will be in Munich in September and are looking for the best public transit ticket to cover two and a half days and a trip to the airport. Suggestions?
It depends on what you will be doing and how far you are willing to walk. We rarely used any transit in Munich. Right now, all I can think of is that we went to Nymphenburg on the bus. Also, if you intend to do a day trip via train on a Bayern ticket, the train ticket also allows you to use transportation within the city itself for that day, at least that was the case when I was there a few years ago.
Depending on where you want to go, you may just want to buy tickets as you go out of the ticket vending machines.
A group day ticket from the airport is 24.30 EUR and will cover both of you until 6 am the next day for the entire network. You do have to travel together at all times, since there is only one physical ticket.
Just the inner district is 12.80 EUR for the day for the 2 of you. A single trip in the inner district is 2.90 EUR per ride, unless it is a "short ride" of only a few stops for 1.50 EUR.
If you want to go to Dachau, that is outside the inner district, so you would need a XXL Group day ticket for 16.10 EUR.
Just remember that the Bayern ticket validity starts at 9 am on a non-holiday weekday.
There is also a three-day ticket (not mentioned on the English-language version of the website, but still on the German one) which is 16.80 euros per person. Note that this only covers the city region and will not take you as far as the airport or Dachau.
That 16.80 EUR 3-day inner district ticket is mentioned in the English version, but it is only for 1 person. Since the group version is 29.60 EUR, 2 people would be better off with that ticket, but it does not include the airport. That would have to be bought separately and end up costing more in total.
For our family of 4 (2 adults, 2 kids), we got the 3 day group ticket for our 4 night stay last April. We got it at the main station from a machine at the beginning of our stay and it was nice not to worry about getting a ticket every time we got on. Whatever ticket you get, make sure to download the MVV app. It was super helpful both in planning trips in advance as well as on the fly when we stayed longer (or shorter) somewhere or wandered from our intended station. It was free for Android. The MVV website was very user friendly for helping plan from home: https://www.mvv-muenchen.de/en/index.html