how long to cook london broil on grill
For a typical London broil (about 1–1.5 inches thick), plan on about 10–15 minutes total on a hot grill for medium-rare, but always go by internal temperature rather than time.
Ideal time and temperature
- Preheat grill to medium‑high or high (around 450°F). Aim for strong, direct heat.
- Sear 4–6 minutes per side, turning once, until the internal temperature reaches about 130–135°F for medium‑rare.
- Total cook time for a 1–1.5 inch steak is usually 10–15 minutes; thicker pieces (1.5–2 inches) can run 15–20 minutes.
- Let the steak rest 5–10 minutes before slicing thinly against the grain to keep it tender.
Quick rule of thumb: hot grill, 4–6 minutes per side, pull at 130–135°F, rest, then slice thin across the grain.
Mini tips for best results
- Use a marinade (common in London broil) to help with flavor and tenderness, especially since the cut is usually lean and can be tough if overcooked.
- Focus on internal temp:
- 125–130°F: rare
- 130–135°F: medium‑rare (most recommended)
- 135–145°F: medium
Going much past medium can make London broil chewy.
Simple timing “cheat chart”
| Thickness | Doneness | Approx. Grill Time (total) |
|---|---|---|
| 1–1.5 inches | Medium‑rare | 10–15 minutes over high, turning once. |
| 1–1.5 inches | Medium | 15–20 minutes, slightly lower heat or longer per side. |
| 1.5–2 inches | Medium‑rare | 15–17 minutes total, start with a strong sear, then finish to temp. |
Quick example method
- Marinate steak for several hours (or overnight) for flavor and tenderness.
- Preheat grill to about 450°F, pat steak dry, lightly oil and season the surface.
- Grill 4–6 minutes per side over direct heat, checking with an instant‑read thermometer.
- Remove at 130–135°F, rest 5–10 minutes, then slice thinly across the grain and serve.
TL;DR
For “how long to cook London broil on grill”: about 4–6 minutes per side over high heat (10–15 minutes total for a 1–1.5 inch steak), pulling it at 130–135°F and letting it rest before slicing thin across the grain.
Information gathered from public forums or data available on the internet and portrayed here.
