Major carriers for ORD→YYC in March often include Air Canada (direct seasonal or codeshare flights), WestJet (connecting via Canadian hubs), and United Airlines (connecting via U.S. hubs). Air Canada typically offers easy connections to Calgary and baggage-inclusive fares on many economy fares, while WestJet is strong for Canadian domestic connections and competitive pricing. United can offer convenience for U.S. travelers with MileagePlus benefits but often requires a connection. Compare baggage rules, change fees, and winter operational experience when choosing; if skiing, check each airline's policy on transporting sports equipment (skis, snowboards) and reserve space early. CTA: Compare carriers for your March ORD→YYC route now to find the best combination of price, baggage allowance, and schedule.