Cheap Flights From O'Hare Intl. (ORD) To Seattle - Tacoma Intl. (SEA)

If you're eager to fly direct from O'Hare Airport to SEA, you won't have a problem finding a fare. Here are the best airlines that advertise nonstop services on this route:

• Alaska Airlines - (AS) with 152 flights every month
• United Airlines - (UA) with 152 flights every month
• American Airlines - (AA) with 108 flights every month
• Delta - (DL) with 78 flights every month

Here's the deal: It is typically possible to start comparing international airfares on Travelocity.ca up to 12 months in advance. However, it does depend on the carrier as not all airlines release their prices that far out. According to our 2021 flight demand trends, last minute planners can still bag a bargain with some of the cheapest fares appearing 2-4 weeks prior to their travel dates.*According to flight demand on Travelocity.ca from January to December 2021. Savings are subject to change and may vary depending on selections made.