The fast version
When runners talk about the two fastest World Marathon Majors, they mean these two: the Bank of America Chicago Marathon and the BMW Berlin Marathon. Both are flat. Both are enormous. Both have produced world records. And both make you win a lottery just to toe the line. If your single goal is a personal best, either one gives you a real shot. But they're not interchangeable, and the differences matter more than most race-finder sites will tell you.
Berlin is the flattest marathon major in the world and the one runners most associate with records, including Eliud Kipchoge's 2:01:09 and Tigist Assefa's 2:11:53. It's late September, the course is asphalt and arrow-straight, and the conditions are usually cool. It's the global PR mecca for a reason.
Chicago is nearly as flat, slightly bigger, and the easier ticket if you have a qualifying time. October weather is cool and the course runs through 29 neighborhoods on wide boulevards with relentless crowd support. Kelvin Kiptum ran 2:00:35 here in 2023, the fastest marathon ever recorded at the time.
One sentence: Berlin is marginally faster and more iconic for records; Chicago is nearly as fast, slightly easier to enter, and more electric in atmosphere.
Course: the two flattest majors, splitting hairs
Both courses are flat enough that terrain is essentially off the table. The differences are small but real.
Berlin is the flattest of all the majors, with roughly 40 meters (about 130 feet) of total elevation change across the full distance. It's a loop starting and finishing near the Brandenburg Gate, asphalt the whole way, with long unbroken straightaways like the Kurfürstendamm stretch around kilometers 10 to 12 that let you lock into a rhythm and never break it. The only tactical note is the exposed final two kilometers along Straße des 17. Juni into the Gate, which doesn't climb but is long and can feel it. This is a course built for even-effort pacing from the gun.
Chicago runs about 243 feet of cumulative gain over 26.2 miles, making it one of the flattest majors but a touch more than Berlin. It's a loop through 29 neighborhoods on the North, West, and South Sides, mostly wide, straight boulevards with minimal turns. The only real grade is a short bridge over Roosevelt Road near the finish, a gentle ramp rather than a hill. Like Berlin, the flatness taxes the same muscles for the whole distance, so train on flat terrain if you can.
Edge: Berlin, narrowly, on pure flatness and smooth surface. But the gap is small enough that it shouldn't be your deciding factor.
Weather: both cool, Berlin a touch cooler
Both races land in the good window, with Berlin running a few weeks earlier.
Berlin in late September: a cool morning in the upper 40s warming to the low-to-mid 60s, generally low humidity. Chicago in mid-October: a low around 47 and a high around 65, usually cool but with a documented history of the occasional warm surprise. Neither is a guarantee, and both can bite, so check the forecast in the final days. On flat courses like these, weather matters more than terrain, because there are no hills to blame.
Edge: a slight nod to Berlin for being marginally cooler and a few weeks earlier, but both are solid.
Atmosphere: Chicago's crowds are the differentiator
If you've run both, this is where they separate. Chicago's crowd support across all 29 neighborhoods is relentless, and the Chinatown stretch around mile 21 delivers a jolt of energy right when your legs start asking questions. It's one of the loudest, most continuous crowd experiences in the sport.
Berlin's crowds are strong too, especially through the city center and at the Brandenburg Gate finish, which is one of the great closing moments in marathoning. But Chicago's wall-to-wall big-city energy is its signature, and for some runners that crowd carry is worth real seconds.
Edge: Chicago for sustained crowd energy; Berlin for the iconic finish.
Getting in: Chicago is the easier ticket
Both use a lottery, and both draw far more applicants than spots, so neither is a sure thing.
Chicago runs an application window that opens in late October, with results in December. Crucially, it offers a guaranteed spot to time qualifiers, plus legacy finishers, Chicago Distance Series completers, and charity runners. If you have a qualifying time, you can skip the lottery entirely. The field is around 55,000.
Berlin runs a lottery open from late September to early November, results in late November. It also guarantees entry to runners with a qualifying (Good-for-Age) standard from the past two years, with charity bibs and official tour-operator packages as backups. The field is similar in size, around 48,000 to 54,000 finishers.
Edge: Chicago, if you're fast. Its time-qualifier guarantee is the most reliable path into either race. For an international runner without a qualifying time, both come down to lottery luck or a charity or tour commitment.
Travel and cost
For a US-based runner, Chicago is the obvious value play: no international flight, no currency conversion, no time-zone adjustment before a race that lives or dies on your sleep. Fly into Midway (about 9 miles from the start) or O'Hare and you're set.
Berlin is a destination, with everything that implies: flights, jet lag to manage, and a higher total trip cost. The payoff is the experience of racing the fastest course in the world and finishing through the Brandenburg Gate. If a PR is the only goal and budget matters, Chicago is the efficient choice. If you want the bucket-list trip with a fast course attached, Berlin justifies the airfare.
The verdict
Pick Berlin if: you want the flattest, fastest course on earth, you're chasing an all-out personal best, and the bucket-list trip through the Brandenburg Gate is part of the appeal. It's the global standard for a reason.
Pick Chicago if: you have a qualifying time and want the most reliable way in, you want big-city crowd energy carrying you through the back half, or you're US-based and want a fast major without the international travel.
Both are among the fastest marathons in the world. For most US runners chasing a PR, Chicago is the smarter, easier play. For the pilgrimage and the flattest course going, Berlin earns it.
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