Ticket + Flight + Train + Accommodation for the final sorted
This is my whole itinerary. I managed to grab a 180 euro ticket today on standby. For travel. I am flying out to Vienna on the Thursday 28, with the flight back on Tuesday morning. That's cost me just over 460 pounds. On the day of the game I take the train from Vienna to Budapest in the morning and arrive by 14:30 in the afternoon. I take the first train back at 5:30 am so I'll spend the whole day in Budapest. The train going and coming all together cost 111 euros.
So the flight + the train is cheaper than Arsenal's own official travel option they've put for fans and much more convenient.
For accommodation I found a very good 4 star hotel for 430 euros for 5 nights. That's a steal compared to the prices Budapest is charging. And I'm getting an actual proper hotel room, not a bed or a hostel.
It's going to be an adventure.