Map of Heathrow Airport Heathrow Airport is located near the M4 in London, England. For terminals 1, 2, and 3, exit the M4 at junction 4. For terminal 4, exit the M4 at junction 3, or exit the M25 at junction 14. As you might expect, there's signposts along the M4 and M25 to help you find your way. Driving to Heathrow airport? Need airport parking? Reserve Heathrow parking on-line. By pre-booking you'll pay much less than if you just turn up and park on the day you fly You might also want to consider booking a Heathrow hotel for the day before your flight. Our rates include airport parking, and often only work out to just a few pounds more than parking alone.