From Toronto Pearson airport, you can either rent a car to drive, or there is the option to take a bus directly from Pearson to downtown London, or the Western University campus. 

i) Rent a car through Enterprise, Budget Canada, or National Car Rental

Directions: In Etobicoke Toronto, get on ON-427 S. Take the exit towards ON-401 W, continue on ON-401 W for 160km, then take Exit 189, Highbury Ave S. Continue on Highbury, turn left on Hamilton Rd, in 2km turn right onto Adelaide St N, in 2km turn left onto Oxford St E, in 1.5km turn right onto Richmond St, in 1.5km turn left onto University Dr. For further details, click here.  

ii) You may also choose to take a bus from Pearson to London. You can book a seat directly through the Onex Bus website, tickets are currently priced at $21.00 each way + tax. Onex allows two free checked bags and one carry-on, Onex does not provide WiFi. You can choose to be dropped directly at Western University, Elgin Hall, or downtown depending on your hotel accommodations.