How Long To Cook Flank Steak In Oven At 400

ByLily

Cooking flank steak in a 400°F oven requires precise timing to keep the meat tender rather than tough. If you want to know exactly how long to cook flank steak in oven at 400, the short answer is 12 to 18 minutes, depending on thickness and your target doneness.

This guide breaks down the timing, temperatures, and simple steps so you get a juicy result every time. Flank steak is lean, so a few minutes too long can dry it out fast.

How Long To Cook Flank Steak In Oven At 400

The total oven time depends on the thickness of your steak and how you like it cooked. Most flank steaks are 1 to 1.5 inches thick. At 400°F, here is a reliable timing chart.

  • Rare (120-125°F internal): 10 to 12 minutes
  • Medium rare (130-135°F internal): 12 to 14 minutes
  • Medium (140-145°F internal): 14 to 16 minutes
  • Medium well (150-155°F internal): 16 to 18 minutes
  • Well done (160°F+ internal): 18 to 20 minutes

These times assume you sear the steak first on the stove. If you skip searing, add 2 to 3 minutes. Always check the internal temp with a meat thermometer for the best accuracy.

Why Oven Temperature Matters At 400 Degrees

400°F is a high heat setting. It cooks the outside quickly while keeping the inside from drying out too much. But flank steak is thin, so it can overcook in just a minute or two.

That is why timing and resting are so important. The steak will continue to cook after you pull it from the oven. This is called carryover cooking. It can raise the internal temp by 5 to 10 degrees.

Best Doneness For Flank Steak

Medium rare is the sweet spot for flank steak. It stays tender and juicy. Well done flank steak gets chewy and tough fast. If you must cook it well done, slice it very thin against the grain.

Step-By-Step Oven Method For Flank Steak

Follow these steps for a perfect flank steak at 400°F. This method uses a cast iron skillet for a quick sear, then finishes in the oven.

  1. Preheat your oven to 400°F. Place a cast iron skillet or oven-safe pan inside while it heats.
  2. Pat the flank steak dry with paper towels. Moisture steams the meat instead of searing it.
  3. Season both sides with salt, pepper, and any dry rub you like. Let it sit at room temp for 20 minutes.
  4. Carefully place the steak in the hot skillet. Sear for 2 minutes per side on the stove.
  5. Transfer the skillet to the oven. Cook for 10 to 14 minutes, depending on thickness and doneness.
  6. Check the internal temperature at the 10 minute mark. Pull it 5 degrees before your target temp.
  7. Rest the steak on a cutting board for 5 to 10 minutes. This locks in the juices.
  8. Slice against the grain into thin strips. This is key for tenderness.

If you do not have a cast iron skillet, use any oven-safe pan. You can also broil the steak for 2 minutes at the end for a darker crust.

How To Tell When Flank Steak Is Done

Do not rely on color alone. Use a digital meat thermometer. Insert it into the thickest part of the steak, away from any fat or bone.

  • 120-125°F: Rare
  • 130-135°F: Medium rare
  • 140-145°F: Medium
  • 150-155°F: Medium well
  • 160°F and up: Well done

Remember that the temp will rise 5 to 10 degrees while resting. So pull the steak when it is 5 degrees below your target.

Tips For Tender Flank Steak Every Time

Flank steak has long muscle fibers. That is why slicing against the grain is non-negotiable. Here are more tips to keep it tender.

  • Do not skip the rest. Resting lets the juices redistribute.
  • Slice thin. Thick slices are chewy.
  • Use a marinade. Acidic marinades like lime juice or vinegar help break down fibers.
  • Do not overcook. Medium rare is best.
  • Let the steak sit at room temp before cooking. Cold meat cooks unevenly.

Common Mistakes To Avoid

Many home cooks ruin flank steak by cooking it too long or slicing it wrong. Avoid these common errors.

  1. Cooking it straight from the fridge. This adds 3 to 5 minutes to the cook time and can dry out the edges.
  2. Not preheating the pan. A cold pan means no sear and a gray steak.
  3. Slicing with the grain. This makes even a perfectly cooked steak tough.
  4. Leaving it in the oven too long. Flank steak cooks fast at 400°F.
  5. Forgetting to rest. Cutting too soon lets all the juice run out.

Can You Cook Flank Steak From Frozen At 400?

Yes, but it takes longer. Add about 50 percent more time. So instead of 12 to 14 minutes, plan for 18 to 21 minutes. Sear it first if you can. Always use a thermometer to check doneness.

Serving Ideas For Oven Baked Flank Steak

Flank steak is versatile. Slice it thin and serve it over rice, in tacos, on salads, or with roasted vegetables. It also works great in sandwiches the next day.

Let the steak cool completely before storing. Keep it in an airtight container in the fridge for up to 3 days. Reheat gently to avoid overcooking.

Now you know exactly how long to cook flank steak in oven at 400. Stick to the timing chart, use a thermometer, and always slice against the grain. You will get a tender, flavorful steak every time.

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