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Dublin's always on a Monday.
Beachy Head is always on a Saturday.
All the Endurance Life coastal marathons are on Saturdays, but yes- more hills!
Kent roadrunner marathon is the only other flat road Saturday one I know of.
There's a marathon double in Liverpool one New Years Eve and the other on New Years Day, you can do one or both, it's a small event, multi laps but flat as it's on the river front.
I don't know why there aren't more Saturday marathons. Much better to have a wwekend away an be able to celebrate on the Saturday night
Does it have to be maras? Lots of half maras and 10k's round too. See Shakespeare Rotary Half in November for example
Another hilly Saturday marathon . . . The Picnic (insanely hilly!)
Highland Perthshire marathon (and half) is on Saturday - 1st Saturday in September. Start and finish in Aberfeldy. I did the half this year - good race; marathon is 2 laps of same course. Maybe not as hilly as the name suggests, but not flat either.
If you are a bit flexible about distance some of the multidays welcome single day entrants.
Stockholm, Oslo and Helsinki are on saturdays.
Isle of Wight marathon is on a Saturday as I recall (early to mid May). It's a tough one mind, you wouldn't think you could fit that many hills on such a small island!