50 Hacks for Smarter Last-Minute Travel Planning

Airlines often discount flights on Sundays and Tuesdays for travel later that week. "Including a Saturday-night stay generally results in locking in the lowest ticket prices," says Expedia spokesperson Alexis Tiacoh.

Purchasing separate one-way flights on two different carriers can sometimes offer a better value than booking a round-trip ticket. If you're traveling internationally, you'll need to show proof of your return flight at check-in and at border control, so bring printouts of all itineraries and receipts.

Sign up to receive alerts on Expertflyer.com or the Hopper app to notify you as soon as seats become available on a particular route, letting you book before others — and score last-minute deals.

Paul Tumpowsky, owner of the travel agency Skylark, says that many firms, like his, have access to seats that don't show up on airlines' websites. If you're finding only sky-high fares for a trip this weekend, don't assume that cheaper options aren't available.

While you might pay a little more for the airfare, bundling your flight, hotel, rental car, and activities can often reduce the total cost of a spontaneous vacation. Booking.com, Priceline, and Travelocity all offer good-value vacation packages.

"Airfare consolidators sell the types of fares that don't require advance purchase, but most are on international routes and carry other restrictions, such as being totally nonrefundable," says Airfarewatchdog founder George Hobica. Check out airlineconsolidator.com.

"Keep a bank of transferable points with programs like Citibank Thank You, American Express Membership Rewards, and Chase Ultimate Rewards," recommends MilesTalk.com founder Dave Grossman. "Airlines often open up award space just a day or two before travel when there are unsold seats."

Unless you're traveling the Northeast Corridor, where heavy demand requires early booking, last-minute tickets on Amtrak can be an affordable alternative to short-haul or regional flights. Look for discounted tickets and promotions at amtrak.com/deals.

"When flying with foreign airlines, it often makes sense to pay in the local currency," says Brian Kelly, a.k.a. the Points Guy. He notes that you can do that by booking directly with a carrier on its native website — he cites Norwegian as one example — or by using the international sites of Expedia and other aggregators.

You can often get great last-minute deals on destinations that aren't in high season. For example, visit the Caribbean from May through October or Europe from September through March.

Subscribe to e-mails from your favorite airlines to find out about last-minute flight deals. Third-party sites, such as Airfarewatchdog, Scottscheapflights, and the paid service DealRay will also help you find cheap fares.

The Get the Flight Out app (iOS only) from fare tracker Hopper is a go-to choice for travelers looking for same-day flights. The inventory is from major airlines as well as low-cost carriers, and the prices are always favorable. A recent search found a British Airways round-trip from JFK Airport to London's Heathrow for $500.

Google Flights' Discover Destinations feature lets travelers plug in their preferred travel dates — starting with the current day —and get a list of dozens of destinations that have the best airfare specials.

Be careful not to book too fast, suggests Julie Danziger, director of luxury travel services at Ovation Vacations. Don't grab a great deal on a flight before securing your hotel — especially when traveling during high season. "Too often, travelers book one part of their trip in a rush, only to discover that the other components don't fall into place," she says.

To get the best deals on last-minute fares, avoid Friday evenings and Monday mornings, when business travelers, who often pay premium rates, are frequent fliers. You're most likely to find low fares when traveling on Tuesday, Wednesday, and Saturday.

Two car-sharing services with cheaper rates than Zipcar cater to short-term renters. Car2Go, owned by Daimler, has launched in seven U.S. cities, including New York, Denver, and Seattle, and Maven, from General Motors, rents vehicles in 14 metropolitan areas in the U.S. and Canada.

If you're heading out on a spontaneous road trip, you'll find that many agencies routinely offer discount codes on their sites, usually for fully prepaid rentals. A recent Hertz promotion shaved 15 percent off the base rate. Check to make sure that the offer is valid at your rental location before booking.

While car-rental companies will sometimes offer significant discounts on unreserved cars, check out aggregator sites, too. Carrentals.com has some of the best deals, and it allows you to sign up for price-drop alerts. Members-only discount retailers BJ's and Costco also offer discounts on car rentals.

Renting a car at the last minute in a major city is notoriously expensive, especially on weekends. Consider taking public transportation to the suburbs, where name-brand agencies often charge less.

Rather than pay for long-term parking, let Travelcar rent your car while you're out of town. The Paris-based company just launched in Los Angeles and San Francisco, with five additional cities in the U.S. coming in 2017. If you're traveling to one of these places, you can rent someone else's car for up to 70 percent less than with a typical rental agency.

Call and ask to speak to the manager or front desk (not the reservations line) to ask for the best available rate. First check the price listed online for your dates, then ask whether the hotel can do better.

If you prefer to book online, "always compare rates quoted on aggregator sites and booking apps to those on a hotel's own site," says miles expert Dave Grossman. "I've seen some amazing deals, but have also seen cases where it would have been significantly cheaper to book directly with the hotel."

Travel sites like Hotwire and Priceline have offers for unnamed hotel properties (and car rentals) that aren't revealed until you commit to a purchase. Some of their best deals can arrive at the last minute. Put on your blindfold and leave it to fate — you can often be rewarded with as much as 60 percent off published rates.

Consider packing light and staying at more than one hotel. Once you've arrived at your destination, upgrading to another property with steep day-of price reductions on vacant rooms can be cost-effective.

Sometimes a hotel's website will indicate no availability for your preferred dates, but a good consultant has the connections to get a last-minute reservation.

Online travel agencies, such as Booking.com, Expedia, Kayak, and Hotels.com, give their members extra savings of 10 percent or more on last-minute bookings.

Find spur-of-the-moment hotel deals by using three great apps: HotelTonight can be used to book up to one week ahead of travel and has special Geo Rates that target users based on their GPS location, One:Night offers same-day bookings for dozens of luxury properties, and Secret Escapes has last-minute deals for upscale hotels — sometimes as much as 70 percent off published rates.

Some cities have visitor patterns that you can work to your advantage. Las Vegas, a popular spot for weekenders, is cheaper during the week, for example, while New York City is often cheaper on the weekends since it's a big draw for business travelers.

The Web-browser extension Honey searches the Internet for promo codes to help you save on retail sites such as Amazon, Target, and Macy's. Its newly launched travel site offers exclusive discounts of up to 55 percent on hotels.

When booking on Airbnb, you're dealing directly with the property owner (or renter), and rates can be negotiable, especially if you're traveling at the last minute. While lowballing could misfire, a reasonably discounted offer might score you some savings.

The members-only app I Know the Chef can guarantee seating at dozens of restaurants in Chicago, Miami, and New York City. The $75 quarterly fee is steep, but a 10-day trial costs $25.

A spontaneous trip means you'll likely be unable to get reservations at the city's hottest restaurants. OpenTable is the go-to booking app for reservations in dozens of cities around the world, though not every restaurant uses it. Rezhound.com will alert you when a slot becomes available on OpenTable. Also check out Resy if you're visiting New York City, Washington, D.C., Miami, Los Angeles, or San Francisco. "If you can't find a desired time, sign up for an alert," says Paola Graham, destination manager for American Express Travel. "This tactic once scored me a last-minute reservation at coveted Japanese spot N/Naka in L.A."

Walk-ins are often accommodated late in the afternoon, and reservations at buzzy restaurants are more plentiful then, too. "Plus you'll experience a more leisurely meal," says Caroline Potter, chief dining officer at OpenTable, "and the restaurant is less likely to have run out of any specials."

Hotel concierges have the connections to help you score a table at the most sought-after restaurants. Even if they can't fulfill your wildest dreams, they will have suggestions for little-known or up-and-coming hot spots.

Whether or not you receive Groupon's subscription-based offers in your home city, taking advantage of its dining deals in your destination is an easy way to help with the cost of your vacation. And you can always unsubscribe from the destination-specific newsletters after your trip.

Instead of dinner, a meal earlier in the day could be the next-best thing, notes Amex's Graham. "Nobu Malibu offers a weekend brunch that's worth it for the ocean views alone," she says.

If you can't nab a table at your desired restaurant, consider seats at the bar or the chef's counter. Sometimes bar seats even have privileges like special menus with better pricing. Also make friends with the bartender, who might be able to tell you about off-menu dishes.

"When you dine midweek, there's more availability, and the restaurant will appreciate your business. I have a restaurant-owner friend who always says, 'If you want to show me how much you love my restaurant, show up on a Tuesday, not a Saturday when we're slammed.'" —Caroline Potter, OpenTable

Not all cruise fares are all-inclusive, so double-check to see what's excluded. Alcoholic beverages, Wi-Fi, and shore excursions may be extra. A very cheap cruise might seem attractive — until you add it all up. In the end, a pricier cruise might be a better option.

If you find your cabin offered for a lower rate after you've paid for it, call the cruise company to see if it will refund you the difference. At the very least, they may give you a shipboard credit.

As cruising has grown in popularity in recent years, many ships now sell out months in advance. But an industry specialist will have close ties with reservation managers. Ruth Turpin, owner of Cruises Etc., says, "We know whom to call if we need something last-minute, because sometimes the cruise lines hold back cabins for last-minute issues."