Does my trip qualify for a price match guarantee?
If the price of your flight goes down after you've booked it, you might be able to score a refund of the difference.
"A lot of online travel agencies like Travelocity will price match your flights if you book within 120 days of your departure and the price changes," Dohmen told Business Insider. "Travel agents may be able to leverage a service or feature like this, too."
Would a packaged tour be a cheaper option than building a custom tour?
While you might think the packaged tour offering has too many extras (read: unnecessary spending), Joanna Franco and Damon Dominique of the budget travel blog Shut Up and Go suggest asking whether customization could turn out to be more expensive in the end.
Read more: Travel guru Rick Steves shares 10 tips to save you money, time, and stress when you're on vacation
Agents can strike deals on these tours, too, so it's better to book them ahead of time via the experts than to sign up after you've already arrived.
Does the price of the tour include admission fees?
Know what's included in the tour before you book it. Sometimes the total cost doesn't even cover admission fees to some of the day's activities. Is it really all-inclusive or will you be responsible for buying your own meals?
And although paying a deposit at the time of booking is often the default, sometimes paying in full up front yields a lower price.
Can I save money by flying at different times of the day or on different days?
"Let your agent know if your travel dates are flexible as they may be able to surface cheaper options," Dohmen said. "Our research shows travelers generally save the most when they leave midweek and come home on a Sunday. You can also save if you're willing to visit during off-peak times of year."
Would it be cheaper to fly into a secondary airport?
Dohmen also says you could save money just by flying into a secondary airport, especially in big cities like London and Paris. Those who already plan to rent a car might find that avoiding the main airport is cheaper and less stressful overall.
"Travelers can save quite a bit if they're willing to spend a little extra time on the ground," she said.
Is there a neighborhood outside of the city center that offers cheaper accommodation?
So you'll be renting a car? In that case, Franco and Dominique of Shut Up and Go suggest getting away from the hubbub of downtown and looking for hotels in local neighborhoods instead. Less demand for these off-the-beaten path options means more savings for you (and probably less noise, too).
Does the hotel offer any perks?
Without built-in amenities such as complimentary breakfast and parking, these little expenses can add up quickly and unexpectedly, eventually tipping the scales. Does the hotel offer free airport shuttles or allow early check-ins and late check-outs?
Where is the best place to park?
Speaking of small expenses stacking up: Additional fees for valet or on-site parking can be a real budget breaker, Dohmen said. Know where you're going to park ahead of time or choose a hotel that offers a complimentary spot.
What's the best way to pay?
When traveling abroad, foreign transaction fees can be astronomical if you're not careful. Familiarize yourself with the exchange rates and ask your agent for a recommendation on methods of payment.
Are there currency exchange kiosks that offer decent rates in the area, or will you need to bring a travel card?
What support do you provide if issues arise?
Travel agents expect issues and know how to handle them properly so that you don't have to waste your precious vacation time calling airlines to snag a new flight. Let the expert deal with your delays, cancellations, missed connections, and unanticipated changes to hotel reservations and you probably won't end up paying an extra price.
