At some point or another – whether you're a seasoned jet-setter or inexperienced traveler – you've likely frantically rummaged through your belongings in search of a misplaced passport. After spending hours retracing your steps and scanning every pocket and piece of luggage only to realize your passport is gone, your knee-jerk reaction might be to reach for your phone and seek comfort from a loved one. "It's a shock," says Michelle Bernier-Toth, managing director of overseas citizen services for the U.S. State Department’s Bureau of Consular Affairs. But the key is staying calm and avoiding panic should this situation arise, she says, adding, "While it is an inconvenience, of course, it's not something we can't deal with."To navigate this tense situation while abroad, follow these expert-approved strategies for replacing a passport as quickly as possible and minimizing hassle along the way.[See: How to Fly through Airport Security.]Declare Your Passport Missing or StolenThe first step is filing a police report, Bernier-Toth says, pointing out that this is especially important if you're a victim of a crime. After contacting the local authorities, it's critical to contact the nearest U.S. embassy or American consulate to declare your passport misplaced or stolen. Once a passport is reported, it's entered into the Consular Lost and Stolen Database and flagged, so if you happen to find your old passport, it's no longer valid for travel, she says.Fortunately, the process for filing a lost passport is fairly simple. You can submit the required DS-64 form online through a safe portal available on the State Department's website. Alternatively, you can report a missing passport by calling 1-877-487-2778. However, to replace a passport, you must submit the DS-11 passport application in person at the nearest embassy or consulate.If you have the free ItsEasy renewal app (available on iPhone and Android), you can submit the 2-by-2-inch required passport photo and required document digitally through the portal. The app alerts you to where the closest embassy is located, says David Alwadish, CEO of ItsEasy.com, enabling you to easily pinpoint need-to-know emergency info and expedite the process. ItsEasy directs users to the appropriate government-required passport renewal forms and advisories.Prep Your Materials for Your AppointmentOnce you've submitted a sworn statement at your closest U.S. embassy or consulate about how your passport was lost or stolen, you'll need to arrange an in-person appointment where you can submit the required materials for an emergency passport. Before arriving at your appointment, make sure to carry proof of identity or citizenship, Bernier-Toth says. You'll also need a passport photo, and it's a smart idea to carry a copy of your passport with you. "Take a new passport photo prior to going to the embassy. Doing so will help expedite the passport replacement process," advises Tom Spagnola, senior vice president, supplier relations at CheapOair. You should also expect to pay a standard $140 application fee for a passport and passport card (expedited service fees are an added $60).Also, keep in mind that embassies and consulates will want to know more details about your itinerary, Bernier-Toth says, so it's best to bring your flight and lodging details as well. Generally, embassies and consulates will not be able to issue passports during weekends or holidays. Otherwise, you can anticipate a quick turnaround with a limited validity or emergency passport in the same day, she adds.[Read: 7 Things TSA Wants You to Know About Airport Security.]Do Your Research and Revise Your Itinerary if Necessary"As long as there is a U.S. embassy or American consulate, the process should take place without any delays," Spagnola says. But there are some caveats. For example, if you're traveling somewhere that's remote, you may encounter delayed processing times for receiving a limited validity passport, he says. And though a limited validity passport displays the same information as a regular passport but with fewer pages, the delay in receiving it could impact your itinerary. "The other concern is that there could be substantial change fees from the airline should you need to change your flight dates," he cautions, and there may be other visa and entry and exit requirements, such as restricting emergency passports, imposed from other destinations on your itinerary."Look for any travel alerts and warnings," Bernier-Toth says, emphasizing the importance of understanding what's required for the specific destinations on your itinerary. "Make sure you have an emergency plan," she says, adding that it's important to know how to get in touch with the embassy should such a situation come up. She also recommends bringing a driver's license as a secondary form of ID, regardless of whether you're planning to drive overseas. "We can only issue an emergency passport where we have an embassy or consulate," Bernier-Toth says. There are places where the U.S. doesn't have diplomatic relations, and therefore it's essential to find a way to access a neighboring country, she explains. Take Iran, for example, where the Embassy of Switzerland serves as the protecting power of the U.S. While the Swiss can offer the proper documentation for a U.S. citizen to receive an emergency passport, the request needs to be issued by the U.S. government and could take weeks to process, Bernier-Toth explains. Although the Swiss government can file a form for issuance, "the bottom line is [travelers] are going to have to get themselves to a consulate or embassy," she says. She urges travelers to visit the State Department website to browse country-specific travel information and stay up to date on the current political climate and entry and exit requirements in destinations on their itinerary.[See: 8 Ways You're Irritating People at the Airport.]Replace Your Passport at HomeWhile an emergency passport resembles a regular passport, it's only valid for one year. Upon returning to the U.S., you can easily exchange the passport for a passport that's valid for 10 years without paying an additional fee, she adds. The processing time for receiving a full passport hinges on where and when your passport was issued, but like typical passports, expect it to take around four to six weeks.