Here is a great Cydia add-on for international travelers. International Locations for Siri allows Siri to perform local searches outside of the U.S.. While Siri can speak several languages, and is also available in other countries, location based services are currently only available in the U.S..
I obviously can't test the tweak without leaving the country, but the $0.99 investment may be worth the risk to some frequent travelers. The add-on is available for download via the BigBoss repo. If you do not already have AssistantExtensions it will be installed when you download the tweak.
Afghanistan, Algeria, American Samoa, Andorra, Angola, Argentina, Australia, Austria, Bahrain, Bangladesh, Belgium, Benin, Bhutan, Botswana, Brazil, Brunei, Bulgaria, Burundi, Cambodia, Canada, Central African Republic, Chad, Chile, China, Côte D’ivoire, Croatia, Czech Republic, Democratic Republic of the Congo, Denmark, Djibouti, Egypt, Estonia, Ethiopia, Fiji, Finland, France, French Polynesia, Gabon, Gambia, Germany, Ghana, Greece, Guam, Hong Kong, Hungary, Iceland, India, Indonesia, Iraq, Ireland, Israel, Italy, Japan, Jordan, Kazakhstan, Kenya, Kuwait, Kyrgyzstan, Laos, Latvia, Lebanon, Liechtenstein, Lithuania, Luxembourg, Macao, Macedonia, Madagascar, Malawi, Malaysia, Maldives, Malta, Mauritius, Mexico, Mongolia, Morocco, Mozambique, Myanmar(Burma), Namibia, Nepal, Netherlands, New Caledonia, New Zealand, Nigeria, Northern Mariana Islands, Norway, Oman, Pakistan, Palau, Papua New Guinea, Philippines, Poland, Portugal, Qatar, Republic of the Congo, Romania, Russia, Rwanda, Samoa, São Tomé And Príncipe, Saudi Arabia, Senegal, Serbia, Seychelles, Sierra Leone, Singapore, Slovakia, Slovenia, Solomon Islands, South Korea, South Africa, Spain, Sri Lanka, Sweden, Switzerland, Taiwan, Tajikistan, Tanzania, Thailand, Togo, Tonga, Tunisia, Turkey, Turkmenistan, Uganda, Ukraine, United Arab Emirates, United Kingdom, Uzbekistan, Vanuatu, Vietnam, Yemen, Zambia, Zimbabwe