The Exposition Flyer was a passenger train jointly operated by the Chicago, Burlington & Quincy (CB&Q), Denver & Rio Grande Western (D&RGW), and Western Pacific (WP) railroads between Chicago and Oakland, California, for a decade between 1939 and 1949, before being replaced by the famed California Zephyr.

In the beginning, the train used steam locomotives as motive power and consisted of the heavyweight Pullman standard cars.

In later years, however, the train would operate using diesel power and in the final months of service, used streamlined passenger cars.

In 1949, the CB&Q, D&RGW and WP replaced the Exposition Flyer with the all streamlined California Zephyr, which operated over the same route.

Some of the route was shared by the Missouri Pacific Railroad's Scenic Limited, which ran between Kansas City and San Francisco.