How Long To Cook London Broil In Oven At 425

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Cooking London broil at 425°F requires careful timing to avoid overcooking this lean cut. If you want to know exactly how long to cook london broil in oven at 425, the short answer is 18 to 25 minutes for a 1.5 to 2 pound piece, depending on thickness and your target doneness.

London broil is not actually a cut of meat. It is a cooking method, but most grocery stores label top round or flank steak as London broil. These cuts are lean, which means they can turn tough fast. High heat at 425°F gives you a nice crust, but you must watch the clock closely.

This guide breaks down the timing, temperatures, and steps so you get tender, juicy slices every time. No guesswork needed.

What Exactly Is London Broil And Why Timing Matters

London broil usually refers to a thick, lean cut like top round. It has little fat, so it dries out quickly in the oven. That is why 425°F works well: high heat sears the outside while keeping the inside from overcooking too fast.

But lean meat also means there is a small window between perfect and tough. If you go past medium rare, the texture gets chewy. So the cooking time is not just a suggestion. It is the difference between a great dinner and a disappointing one.

Best Cuts Sold As London Broil

  • Top round steak (most common)
  • Flank steak
  • Sirloin tip
  • Shoulder steak (less common)

All of these work at 425°F, but thickness changes everything. A 1-inch steak cooks much faster then a 2-inch one. Always check the thickness before you start.

How Long To Cook London Broil In Oven At 425

Here is the core timing guide. These times assume you preheat the oven fully and use a broiler pan or wire rack. Times are for a 1.5 to 2 pound London broil.

  • Rare (120°F to 125°F): 16 to 18 minutes
  • Medium rare (130°F to 135°F): 18 to 22 minutes
  • Medium (140°F to 145°F): 22 to 25 minutes
  • Medium well (150°F to 155°F): 25 to 28 minutes
  • Well done (160°F+): 28 to 32 minutes
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These times are for a 1-inch thick piece. If your meat is 1.5 inches thick, add 5 to 7 minutes. If it is 2 inches thick, add 10 to 12 minutes.

Always flip the meat halfway through cooking. This helps both sides brown evenly and keeps the juices inside.

Quick Timing Chart By Thickness

  • 1 inch thick, medium rare: 18 to 20 minutes
  • 1.5 inches thick, medium rare: 23 to 27 minutes
  • 2 inches thick, medium rare: 28 to 34 minutes

Remember: these are estimates. Your oven may run hot or cold. An oven thermometer is your best friend here.

Step By Step Cooking Instructions For London Broil At 425°F

Follow these steps for a reliable result every time.

  1. Take the London broil out of the fridge 30 minutes before cooking. Room temperature meat cooks more evenly.
  2. Preheat your oven to 425°F. Place the rack in the middle position.
  3. Pat the meat dry with paper towels. Moisture steams the meat instead of searing it.
  4. Season both sides generously with salt, pepper, and garlic powder. You can also use a simple marinade, but dry it off before cooking.
  5. Place the meat on a broiler pan or a wire rack set inside a baking sheet. This lets heat circulate under the meat.
  6. Put the pan in the oven and set a timer for half the total cooking time.
  7. Flip the meat once at the halfway point.
  8. Start checking the internal temperature 5 minutes before your estimated finish time.
  9. Remove the meat when it is 5°F below your target temperature. It will rise as it rests.
  10. Let it rest on a cutting board for 10 minutes. Do not skip this step.
  11. Slice thinly against the grain. This is the most important step for tenderness.
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If you skip the rest, the juices will run out and you will get dry meat. If you slice with the grain, it will be chewy no matter how perfect the cooking time was.

How To Check Doneness Without A Thermometer

You really should use a meat thermometer. But if you do not have one, here is a backup method.

  • Rare: The meat feels soft and squishy, like your cheek.
  • Medium rare: It feels springy but still soft, like your chin.
  • Medium: It feels firm but has some give, like your forehead.
  • Well done: It feels very firm with almost no give.

This method is not exact, but it works in a pinch. Still, a $10 thermometer is worth every penny for lean cuts like this.

Common Mistakes To Avoid When Cooking London Broil

Even good cooks mess up London broil. Here are the mistakes that ruin this cut.

  • Cooking it past medium. This cut gets tough fast after 145°F.
  • Not resting the meat. Resting lets the juices redistribute.
  • Slicing with the grain. Always cut across the grain.
  • Using a cold oven. Always preheat fully to 425°F.
  • Crowding the pan. Use a pan that gives the meat space.
  • Forgetting to flip. One flip halfway through is enough.

Also, do not poke the meat with a fork while it cooks. Use tongs. Every hole lets juice escape.

Should You Marinate London Broil Before Cooking?

Yes, a marinade helps. But it is not a magic fix for overcooking. An acidic marinade with lemon juice, vinegar, or wine can tenderize the surface. Soy sauce and oil add flavor and help browning.

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Marinate for at least 2 hours, or up to 24 hours in the fridge. Pat it dry before it goes in the oven. Wet meat will not sear well at 425°F.

What To Serve With London Broil

London broil pairs well with simple sides. You do not need anything fancy.

  • Roasted potatoes with rosemary
  • Steamed green beans with butter
  • A simple green salad with vinaigrette
  • Grilled onions and peppers
  • Crusty bread to soak up the juices

Slice the meat thin and fan it out on a platter. Spoon the resting juices over the top. That is a restaurant-quality plate at home.

Final Tips For Perfect London Broil Every Time

Use these tips to lock in your results.

  • Buy a piece that is at least 1 inch thick. Thinner cuts overcook too fast.
  • Let the meat sit at room temperature for 30 minutes before cooking.
  • Preheat the oven and the pan if you can. A hot pan gives a better crust.
  • Use a thermometer. Check at the earliest time in your range.
  • Rest for 10 minutes. Slice against the grain. Serve warm.

Once you cook London broil at 425°F a couple of times, you will learn your oven’s quirks. Maybe it runs hot. Maybe it runs cold. Adjust your timing by a few minutes and you will nail it.

The key takeaway is simple. For a 1.5 to 2 pound London broil at 425°F, plan on 18 to 25 minutes for medium rare. Check the temperature early, rest the meat, and slice it thin. Do that, and you will get tender, flavorful results every single time.