SEA to BWI, Seattle–Tacoma International Airport to Baltimore/Washington International Airport Cheap Flights

Based on HopeGoo data, Delta Air Lines offers one-way fares as low as US$91 on Cheapest nonstop routes (e.g. SEA to BWI on Thu, Apr 23), while American Airlines offers Cheapest nonstop round-trips from US$185 departing on Wed, Apr 29 and returning on Tue, May 5.

At the moment, you can catch a nonstop flight from Seattle to Baltimore with the following airlines, including: Alaska Airlines Selected airlines are based on historical data collected from flight bookings users made on HopeGoo within the last 90 days.

It takes about 5 hours 5 minutes to fly from Seattle to Baltimore.

By analyzing data from all airlines on the HopeGoo flight calendar, it looks like the best time to book a flight from Seattle to Baltimore is around 40 days (6 weeks) in advance, and the best time to fly is usually on Tuesday, Wednesday, and Saturday. Tuesday typically offers the cheapest flights for departure, while Saturday offers the best return deals.

Based on HopeGoo data in the past 4 weeks, there is 12 flight per week flying from Seattle to Baltimore. You can check the weekly schedule for popular airlines on this route below: Alaska Airlines: S/M/T/W/T/F/S -- AS378 (10:25)

To find best deals on flights from Seattle to Baltimore, you can use various tools on HopeGoo: · Be flexible with your travel dates to get the cheapest flight deal. Now the cheapest flight deal is on Thu, Apr 23, with one-way flights priced at just US$91. · Compare airlines strategically. Budget carriers often provide the lowest base fares, while we found the most affordable airline currently operating on this route is United Airlines. · Set up price alerts to easily monitor ticket prices without having to check every day. · Check HopeGoo flight deals and promo codes frequently. · Avoid peak season unless you book very early. It seems the peak season for Baltimore travel is around January. · Get exclusive promo codes for HopeGoo app users.

The cheapest months to fly from Seattle to Baltimore is October, when demand for travel is lower.

After crunching the numbers on our March flight calendar, it's currently cheapest to fly from Seattle to Baltimore on March 30, 2026 with Delta Air Lines, with prices starting at US$92.

You can land at any one of the following hubs in Baltimore, with Seattle-Tacoma International Airport to Baltimore/Washington International Airport (SEA-BWI) is by far the most common option on this route: Baltimore/Washington International Airport (BWI).

The time difference between Baltimore and Seattle is 3h.

Tickets can only be changed or canceled if permitted by airline policy. To submit a change or cancellation request, go to the flight bookings page, select the option to change or cancel your HopeGoo, choose the relevant passengers and segment, and submit a request. Please note that additional charges may apply according to the airline ticket policy. However, if the flight has been rescheduled and you would like to change or cancel your ticket, you can submit an involuntary cancellation request. For more details about change and cancellation policies, please check the customer support pages.