Getting a great flat iron steak on the table often involves using your oven. If you’re wondering exactly how long to cook flat iron steak in oven, the answer is surprisingly short. Finishing a flat iron steak in the oven after searing requires brief, precise timing to hit your ideal level of doneness.
This method gives you incredible control. You get a perfect sear from the stovetop and even, gentle cooking from the oven.
This guide gives you the exact times and temperatures you need. We’ll cover everything from prep to plating.
how long to cook flat iron steak in oven
The core cooking time in the oven is typically between 5 and 15 minutes. The exact duration depends on your oven’s temperature and how you like your steak cooked.
For a standard method, sear the steak first. Then transfer it to a preheated oven at 400°F (200°C).
Here is a straightforward time guide for a 1-inch thick flat iron steak after searing:
- Rare: 3-5 minutes in the oven (internal temp: 120-125°F)
- Medium Rare: 5-7 minutes (internal temp: 130-135°F)
- Medium: 7-10 minutes (internal temp: 140-145°F)
- Medium Well: 10-12 minutes (internal temp: 150-155°F)
- Well Done: 12-15+ minutes (internal temp: 160°F+)
Remember, these times start after the steak is seared. Always use a meat thermometer for the best results. Oven temperatures can vary widely.
Why the Oven Method Works for Flat Iron Steak
The flat iron steak comes from the shoulder area of the cow. It’s known for being flavorful and tender when cooked correctly.
Because of its shape and consistent thickness, it’s an ideal candidate for the sear-and-oven technique. The high heat of the pan creates a flavorful crust.
The oven then gently brings the inside to your preferred doneness without burning the outside. This two-step process is reliable and repeatable.
Essential Tools for the Job
Having the right tools makes the process smooth and ensures a great outcome. You don’t need anything too fancy.
- A heavy, oven-safe skillet (cast iron is perfect)
- Meat thermometer (instant-read is best)
- Tongs
- Cutting board
- Aluminum foil (for resting the steak)
The oven-safe skillet is crucial. You’ll sear on the stovetop and then move the whole pan into the hot oven. This avoids losing juices by transfering the steak.
Choosing Your Skillet
Cast iron is the top choice for many cooks. It retains heat exceptionally well, giving a superior sear. It also transitions seamlessly from stove to oven.
Stainless steel skillets with metal handles are also a good option. Just avoid pans with plastic or rubber handles that can’t withstand high oven heat.
Step-by-Step Cooking Instructions
Follow these steps for a perfectly cooked flat iron steak every single time. The process is simple but requires attention to detail.
Step 1: Preparing the Steak
Start by taking the steak out of the refrigerator. Let it sit on the counter for about 30 to 40 minutes before cooking. This brings it closer to room temperature.
A cold steak won’t cook evenly. The outside can overcook before the inside is done. Pat the steak completely dry with paper towels.
Moisture on the surface creates steam, which prevents a good sear. Then, season generously with salt and pepper on all sides. You can add other dry rubs if you like.
Step 2: Preheating the Pan and Oven
This is a critical step for success. Place your oven-safe skillet on the stove over medium-high heat. Let it get hot for a few minutes.
At the same time, preheat your oven to 400°F (200°C). A properly preheated pan and oven ensures cooking starts immediately and evenly.
You can add a high-smoke-point oil to the pan just before adding the steak. Avocado oil or refined grapeseed oil work well.
Step 3: Searing for Flavor
Once the pan is hot, carefully lay the steak in it. You should hear a strong sizzle. If you don’t, the pan isn’t hot enough.
Do not move the steak for 2-3 minutes. This allows a crust to form. Then, use tongs to flip it and sear the other side for another 2-3 minutes.
If your steak has a fat cap, you can sear the edges too for a few seconds each. This renders the fat and adds more flavor.
Step 4: The Oven Finish
After searing both sides, immediately transfer the entire skillet to the preheated oven. This is where the primary oven cooking happens.
Refer to the time guide above based on your desired doneness. For a medium-rare steak, start checking the temperature at the 5-minute mark.
Insert the meat thermometer into the thickest part of the steak. Avoid touching the pan or any large fat pockets for an accurate reading.
Step 5: Resting is Non-Negotiable
Once the steak reaches your target temperature, remove the skillet from the oven. Use tongs to move the steak to a cutting board.
Loosely tent it with a piece of aluminum foil. Let it rest for at least 5 to 10 minutes. This allows the juices to redistribute throughout the meat.
If you cut into it immediately, the precious juices will run out onto the board, leaving the steak dry. Resting makes a significant difference in tenderness.
Internal Temperature Guide
Time is a useful guide, but temperature is the true key to perfection. Ovens can be inaccurate, and steak thickness varies.
Investing in a good instant-read thermometer is the best way to guarantee your steak turns out exactly as you want it. Here are the final target temperatures after resting.
- Rare: 125°F
- Medium Rare: 135°F
- Medium: 145°F
- Medium Well: 155°F
- Well Done: 160°F+
Remember that the steak’s temperature will continue to rise slightly while it rests, by about 5 degrees. This is called “carryover cooking.”
So, if you want a final temperature of 135°F for medium-rare, you should remove the steak from the oven when the thermometer reads about 130°F.
Factors That Affect Cooking Time
Several variables can change how long your steak needs in the oven. Being aware of them helps you adjust on the fly.
Steak Thickness
This is the biggest factor. A 1.5-inch thick steak will need significantly more time than a 1-inch steak. Always adjust your timing based on thickness, not just weight.
For thicker cuts, you might need to lower the oven temperature slightly to around 375°F. This allows the center to cook without overdoing the exterior.
Your Oven’s True Temperature
Most home ovens are not perfectly calibrated. An oven set to 400°F might actually be 380°F or 420°F.
This is another strong reason to rely on a meat thermometer rather than the clock alone. Consider using an oven thermometer to check your oven’s accuracy.
Starting Temperature of the Steak
As mentioned, letting the steak come closer to room temperature is important. A completely cold steak from the fridge can add 5-7 extra minutes to the oven time.
It can also lead to a overcooked outer layer before the center is done. Plan ahead for that 30-minute rest on the counter.
Alternative Oven-Only Method
You can also cook a flat iron steak entirely in the oven without searing first. This is a good option if you want to minimize splatter or use the broiler.
Preheat your oven to a high temperature, like 450°F. Place the seasoned steak on a rack set inside a baking sheet.
This allows air to circulate. Cook for about 10-15 minutes total, flipping halfway through, until it reaches your desired temperature.
The crust won’t be as pronounced as with a sear, but it’s still a simple, hands-off method. Using the broiler for the last few minutes can help create some browning.
Common Mistakes to Avoid
Even with a simple method, it’s easy to make small errors that affect the outcome. Here are the most common pitfalls.
- Not drying the steak before seasoning. Wet meat steams instead of sears.
- Using a pan that’s not hot enough. Wait for the oil to shimmer or just start to smoke.
- Moving the steak around in the pan during searing. Let it sit to develop a crust.
- Skipping the rest period. This step is essential for a juicy result.
- Cutting the steak with the grain. Always slice flat iron steak against the grain to shorten the muscle fibers and maximize tenderness.
Serving Suggestions
A perfectly cooked flat iron steak is a versatile centerpiece. After resting, slice it thinly against the grain.
This is crucial for tenderness. Serve it with simple sides that complement the rich beef flavor.
Classic pairings include roasted potatoes, a crisp green salad, or sauteed mushrooms and onions. A pat of compound butter melting over the hot slices is a fantastic finishing touch.
Storing and Reheating Leftovers
Leftover flat iron steak can be just as good the next day if handled properly. Let the steak cool completely, then store it in an airtight container in the refrigerator for up to 3 days.
To reheat, avoid the microwave, which can make it tough and rubbery. Instead, slice the steak.
Then warm it gently in a skillet over low heat with a little broth or butter. You can also add it cold to salads for a protein boost.
Frequently Asked Questions
Here are answers to some common questions about cooking flat iron steak in the oven.
Can I cook a frozen flat iron steak in the oven?
It’s not recommended to cook a frozen steak directly. The exterior will overcook before the inside thaws. For best results, thaw the steak completely in the refrigerator first. Then, follow the standard sear-and-oven method.
What is the best oven temperature for flat iron steak?
400°F (200°C) is a reliable and effective temperature. It’s high enough to cook the steak quickly without drying it out, but low enough to allow for control. Some recipes call for 425°F, which will slightly reduce the cooking time.
How do I know when the steak is done without a thermometer?
While a thermometer is best, you can use the hand test. Gently press the center of the steak. If it feels soft and spongy, it’s likely rare. As it firms up, it moves to medium-rare, medium, etc. This method takes practice and is less accurate than a thermometer.
Should I cover the steak with foil in the oven?
No, you should not cover it during the oven phase. Covering it would create steam and soften the beautiful crust you created during searing. Only use foil after cooking, during the resting period.
What’s the difference between flat iron and flank steak?
They are different cuts from different parts of the cow. Flat iron is from the shoulder and is generally more tender. Flank steak is from the abdominal area and is leaner with a more pronounced grain. Both benefit from high-heat cooking and slicing against the grain, but cooking times may differ slightly.