The five fastest marathons for a personal best are Berlin, Valencia, Chicago, Frankfurt and Seville. All five are close to flat and run in cool months between late September and February. All five have pace groups and fields big enough to draft in. Berlin and Valencia run fastest; Seville is the easiest to enter.
You can run a personal best anywhere. But some courses are quietly engineered to help: flat as a table, sheltered from the wind, run in cool autumn or winter air. Pick one of those and the course stops fighting you. Below they are ranked roughly by how fast they run. Each card has what you need to plan a trip: the profile, the date, the weather to expect, and where to apply.
A note on the elevation profiles below: every course here is nearly flat, so the vertical scale is exaggerated to show each one’s character. The real numbers live in each card — trust those, not the wiggle.
BMW Berlin-Marathon
Berlin, Germany
The classic record course. More marathon world records have fallen on these wide boulevards and long straights than on any other course, and it is still the big-city race most associated with fast times. If your only goal is a time, this is the default answer.
- Date
- 27 Sep 2026 (late September)
- Weather
- Cool and often still, ~10–15 °C
- Elevation
- Flat — negligible net gain, wide roads
- Entry
- Ballot lottery (opens the autumn before); or a sub-elite qualifying time; or a charity / tour place
Valencia Marathon (Trinidad Alfonso)
Valencia, Spain
Berlin’s fiercest rival for the title of world’s fastest, and closing the gap every year. Barely 30 metres of climbing across the whole 42.2 km, cool and dry December air off the Mediterranean, and a spectacular finish on a footbridge over the old riverbed.
- Date
- 6 Dec 2026 (early December)
- Weather
- Cool and dry, ~10–16 °C, low humidity
- Elevation
- ~30 m total ascent — among the flattest anywhere
- Entry
- New ballot from 2026 — a small deposit enters the draw, then you pay if drawn
Bank of America Chicago Marathon
Chicago, USA
A flat loop through the city’s neighbourhoods with roaring crowds almost the entire way — one of the six World Marathon Majors. A handful of gentle underpasses are the only bumps; the real variable is the wind off Lake Michigan, which can make or break the day.
- Date
- 11 Oct 2026 (mid-October)
- Weather
- Variable, ~5–13 °C, sometimes breezy off the lake
- Elevation
- Flat — a few underpasses, a small rise near the finish
- Entry
- Non-guaranteed drawing (lottery); or guaranteed with a qualifying time; or charity
Mainova Frankfurt Marathon
Frankfurt, Germany
Germany’s other fast one, and a connoisseur’s PR machine: flat, sheltered, and reliably well-paced. It is famous for its theatrical finish — a red carpet and light show inside the Festhalle arena, the loudest last 100 metres in the sport.
- Date
- 25 Oct 2026 (late October)
- Weather
- Cool, ~7–12 °C
- Elevation
- Flat and sheltered
- Entry
- Open online registration until it sells out — the price rises as bibs fill, so enter early
Zurich Maratón de Sevilla
Seville, Spain
Europe’s flattest big-city marathon, and by far the easiest of these five to get into — no lottery, no qualifying time, just sign up. A slight net drop, mild February air, and a fast, friendly course make it a favourite for a first-time PR attempt.
- Date
- Mid-to-late February
- Weather
- Cool and dry, ~8–15 °C
- Elevation
- Pancake-flat, slightly net downhill
- Entry
- First come, first served — no ballot, no qualifying time (~20,000 places for 2027, which sold out in under two weeks)
What turns a fast course into a PR?
Your training and your pacing turn a fast course into a PR; the course only removes obstacles. A flat profile pays off when the engine and the plan are ready for it:
- Enter early. Berlin, Valencia and Chicago run ballots months ahead; Frankfurt and Seville sell out. Your first PR decision is a calendar reminder, not a workout.
- Train specificity. A flat course rewards sustained goal-pace work — long runs with big blocks at target effort — more than hills ever will.
- Pace flat, not fast. Even splits, or the gentlest of negative splits. The flat profile makes this possible; discipline in the first 10 km makes it real.
- Bank the cool weather. These dates were chosen for a reason. Cool, still air is worth minutes; don’t train through summer and forget to plan for it.
- Use the tools. Carbon-plated “super shoes”, a rehearsed fuelling plan (aim high on carbs per hour), and a pace group to draft with are all legal, and all free time.
The course can’t run the race for you. But the right one gets out of the way — and on the day you’ve trained for, that’s the whole difference.
Pick the race first, then work backwards: the ballot date, the training block, the pace band. Everything else follows from the calendar.