BWI - SEA

$159 Find Cheap Flights from Baltimore to Seattle

This is the cheapest one-way flight price found by a KAYAK user in the last 72 hours by searching for a flight from Baltimore to Seattle departing on 8/21. Fares are subject to change and may not be available on all flights or dates of travel. Click the price to replicate the search for this deal.
1 adult
1 adult, Economy, 0 bags

KAYAK searches hundreds of travel sites at once for deals on flights to Seattle

 
These are the airlines KAYAK users have selected most often from within our search results in flight searches from Baltimore to Seattle.
These are the airlines KAYAK users have selected most often from within our search results in flight searches from Baltimore to Seattle.
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Everything you should know

Cheapest round-trip
$244
Typical prices: $407-$277
Southwest
Tue 9/15Wed 9/23
BWI - SEA • Non-stop
Cheapest one-way
$159
Typical prices: $175-$333
Alaska Airlines
Fri 8/21
BWI - SEA • 1 stop
Top airlines
Cheapest • from $244 (round-trip)
Best reviews • 8.0 score
Airline reviews
Airline reviews
+1
+1
Airline reviews
Airline reviews
+1
Nonstop flights
You can fly direct with Alaska Airlines and Southwest. Average duration is 5h 47m
Direct flights
Direct flights
+1
+1
Direct flights
Direct flights
+1
Top layover airports
Cheapest • Avg $226 (round-trip)
Shortest trip • 7h 35m (one-way)
Insights
Insights
Insights
Insights
When to book
in advance
Our data shows that travelers who book at least 4 weeks in advance save around 47% compared to booking last minute.
Insights
Insights
Insights
Insights
When to travel
Cheapest • 23% price drop
Most popular
Good to know
Good to know
+1
+1
Good to know
Good to know
+1
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Flight Deals

Cheap Flights from Baltimore to Seattle (BWI-SEA)

 
Here are some of the best deals found on KAYAK recently from the most popular airlines for round-trip flights from Baltimore to Seattle that are departing in the next months. While these flights were available on KAYAK in the last 72 hours, prices and availability are subject to change and deals may expire.
Discover the best prices for you by selecting your travel dates on KAYAK.

Recent round-trip flight deals from Baltimore to Seattle

Tue, Sep 15 - Wed, Sep 23
Southwest Logo
10:20 am - 1:00 pm
BWI
-
SEA
5h 40mnonstop
Southwest Logo
10:30 pm - 6:30 am
SEA
-
BWI
5h 00mnonstop
$244Southwest
Sat, Aug 15 - Mon, Aug 24
Delta Logo
12:17 pm - 6:45 pm
BWI
-
SEA
9h 28m
1 stop
Delta Logo
11:59 pm - 10:32 am
SEA
-
BWI
7h 33m
1 stop
$248Delta
Tue, Sep 15 - Wed, Sep 23
Alaska Airlines Logo
6:18 pm - 9:00 pm
BWI
-
SEA
5h 42mnonstop
Alaska Airlines Logo
10:21 pm - 6:28 am
SEA
-
BWI
5h 07mnonstop
$252Alaska Airlines
Fri, Aug 28 - Sun, Aug 30
Delta Logo
7:17 pm - 11:54 pm
BWI
-
SEA
7h 37m
1 stop
Delta Logo
5:10 am - 4:49 pm
SEA
-
BWI
8h 39m
1 stop
$254Delta
Wed, Nov 11 - Sun, Nov 15
United Airlines Logo
6:15 am - 12:12 pm
BWI
-
SEA
8h 57m
1 stop
United Airlines Logo
11:50 pm - 10:19 am
SEA
-
BWI
7h 29m
1 stop
$258United Airlines
Sat, Aug 29 - Mon, Aug 31
Alaska Airlines Logo
6:18 pm - 9:00 pm
BWI
-
SEA
5h 42mnonstop
Alaska Airlines Logo
8:59 pm - 3:40 pm
SEA
-
BWI
15h 41m
1 stop
$262Alaska Airlines
Sun, Aug 9 - Wed, Aug 19
Delta Logo
8:18 am - 4:03 pm
BWI
-
SEA
10h 45m
1 stop
Delta Logo
6:31 pm - 6:20 am
SEA
-
BWI
8h 49m
1 stop
$263Delta
Thu, Sep 10 - Mon, Sep 14
American Airlines Logo
3:57 pm - 11:58 pm
BWI
-
SEA
11h 01m
1 stop
American Airlines Logo
6:40 am - 7:33 pm
SEA
-
BWI
9h 53m
1 stop
$272American Airlines
Mon, Jul 13 - Tue, Aug 18
Delta Logo
6:20 pm - 11:59 pm
BWI
-
SEA
8h 39m
1 stop
Delta Logo
6:31 pm - 6:20 am
SEA
-
BWI
8h 49m
1 stop
$278Delta
Wed, Aug 12 - Tue, Aug 18
Southwest Logo
2:00 pm - 9:00 pm
BWI
-
SEA
10h 00m
1 stop
Southwest Logo
10:30 pm - 6:30 am
SEA
-
BWI
5h 00mnonstop
$291Southwest
Booking Insights

KAYAK's insights & trends for Baltimore to Seattle flights

Get data-powered insights and trends into flights from Baltimore to Seattle to help you find the cheapest flights, the best time to fly and much more.

How much is a round-trip flight from Baltimore to Seattle?

This analysis is based on the cheapest round-trip price found on KAYAK in the last 12 months by searching for a flight from Baltimore to Seattle departing in September.

What’s the cheapest day of the week to fly from Baltimore to Seattle?

The average price of all round-trip flights from Baltimore to Seattle clicked on KAYAK for each day over the last 12 months.

If you are looking for a flight deal from Baltimore to Seattle, look for departures on Tuesdays and avoid leaving on a Sunday, as it's usually the priciest day. When flying back from Seattle, Wednesday is the cheapest day to fly and Sunday is the most expensive.

What is the cheapest month to fly from Baltimore to Seattle?

To calculate monthly average prices, KAYAK takes all prices for each month over the last year for round-trip flights from Baltimore to Seattle, removes the top 0.1% to account for outliers, and then takes the median of all values for each month.

The cheapest month for flights from Baltimore to Seattle is February, where tickets cost $298 (return) on average. On the other hand, the most expensive months are July and March, where the average cost of round-trip tickets is $468 and $462 respectively.

Can I save money by flying with a layover from Baltimore to Seattle?

The average round-trip price for all non-stop flights, flights with one layover, and flights with two layovers for the route found by users searching on KAYAK in the last 2 weeks.

No, with an average price for the route of $437, prices are generally cheapest when you fly direct.

How far in advance should I book a flight from Baltimore to Seattle?

To calculate weekly average prices, KAYAK takes all prices for each week before departure over the last year for round-trip flights from Baltimore to Seattle, removes the top 0.1% to account for outliers, and then takes the average of all the values for each week.

To get a below average price on the flight from Baltimore to Seattle, you should book around 4 weeks before departure, which saves you about 47% compared to booking last minute. For the absolute cheapest price, our data suggests you should book 13 weeks before departure.

Expert advice

Expert advice for your flight from Baltimore to Seattle

 
AI-powered summary based on content written by travel experts. AI can make mistakes.
KAYAK teamed up with top travel experts to share the best tips for your journey.
Our travel experts
Harriet Baskas

Harriet Baskas

Expert on BWI and SEA

Harriet is an award-winning journalist who is happiest in an airport or an unusual museum. Her stories about airports, air travel, and the business of travel have appeared on NBC News, CNBC, USA TODAY, The Points Guy and other outlets. She is the creator of the StuckatTheAirport.com blog and the author of nine books. When not out on the road or exploring the latest airport amenities, she’s home in Seattle getting ready for the next adventure.

Good to know

Low seasonJanuary
Cheapest flight$159
Best time to beat the crowds with an average 18% drop in price.
Most popular time to fly with an average 2% increase in price.
Flight from Baltimore to Seattle

When to book flights from Baltimore to Seattle

Are your dates flexible? Find out the best times to travel from Baltimore to Seattle based on our flight data from the last year. Discover the cheapest month and even day to fly.
Estimated round-trip price
KAYAK looks at all historical flight data for each date to provide a predicted price for one-way trips or round-trips with a duration up to 40 days. While we try to provide actual minimum prices for each date, some prices are predictions and actual prices may differ.

FAQs for booking flights from Baltimore to Seattle

  • Does BWI provide animal relief stations?

    Yes. If you are traveling with a service animal or a pet who needs to go to the bathroom or get a drink of water, you can take advantage of one of the animal relief areas at BWI, 2 Airside and 2 Landside. The post-security stations are located next to the Terminal B/C connector and just beyond the security checkpoint for Concourses D/E. Both of the pre-security areas are located outside the airport. The first one is in front of the Hourly Garage and the second one is next to the Light Rail Station.

  • Does SEA have a USO?

    Yes. If you are an active-duty US military service member or dependent, and you wish to refresh, regroup, or reboot before heading out into Seattle, you can take advantage of the USO on the Mezzanine level above Checkpoint #3. This lounge is open on Thursdays from 8:00 am until 12:00 am the next day and on Mondays, Wednesdays, and Saturdays from 8:00 am until 4:00 am the next day. The USO is closed on Tuesdays, Fridays, and Sundays. Some amenities include showers, places to sleep, travel information, a nursery, a big screen TV, internet access, and more.

  • Does BWI provide facilities for traveling mothers?

    Yes. BWI has installed Mamava lactation suites in every terminal in the airport. These freestanding 4X8 lactation suites are made of fiberglass and Corian and provide cleanliness and privacy for mothers who want to breastfeed in private or who need to pump. Each Mamava pod includes two benches, a shelf, a coat hook, a mirror, motion-activated lighting, an exhaust fan, an electrical outlet, and a USB port.

  • Does BWI provide accommodations for the differently abled?

    Yes. BWI provides wheelchairs, wheelchair assistance, ramps, elevators, lift-equipped buses, accessible restrooms, unisex restrooms, and restrooms that include adult changing stations for an adult and his or her caregiver. BWI also has TDD telephones Video Relay Systems for the hearing impaired.

  • What is the cheapest flight from Baltimore to Seattle?

    In the last 3 days, the lowest price for a flight from Baltimore to Seattle was $159 for a one-way ticket and $244 for a round-trip.

  • Do I need a passport to fly between Baltimore and Seattle?

    No, a passport isn't needed to fly from Baltimore to Seattle. However, local authorities might ask for an official ID.

  • Which airports will I be using when flying from Baltimore to Seattle?

    Baltimore and Seattle are both served by 1 main airport. You will leave Baltimore from Baltimore/Washington and will be arriving at Seattle/Tacoma Intl.

  • Which airlines offer Wi-Fi service onboard planes from Baltimore to Seattle?

    Alaska Airlines, JetBlue, Delta, and American Airlines offer inflight Wi-Fi service on the Baltimore to Seattle flight route.

  • Which aircraft models fly most regularly from Baltimore to Seattle?

    The Boeing 737-800 Passenger/BBJ2 (winglets) is the aircraft model that flies most regularly on the Baltimore to Seattle flight route.

  • Which airline alliances offer flights from Baltimore to Seattle?

    Star Alliance, SkyTeam, and oneworld are the airline alliances operating flights between Baltimore and Seattle, with Star Alliance being the most commonly used for this route.

  • On which days can I fly direct from Baltimore to Seattle?

    There are nonstop flights from Baltimore to Seattle on a daily basis.

  • Which is the best airline for flights from Baltimore to Seattle, Southwest or Alaska Airlines?

    The two airlines most popular with KAYAK users for flights from Baltimore to Seattle are Southwest and Alaska Airlines. With an average price for the route of $450 and an overall rating of 8.0, Southwest is the most popular choice. Alaska Airlines is also a great choice for the route, with an average price of $440 and an overall rating of 7.9.

  • How does KAYAK find such low prices on flights from Baltimore to Seattle?

    KAYAK is a travel search engine. That means we look across the web to find the best prices we can find for our users. With over 2 billion flight queries processed yearly, we are able to display a variety of prices and options on flights from Baltimore to Seattle.

  • How does KAYAK's flight Price Forecast tool help me choose the right time to buy my flight ticket from Baltimore to Seattle?

    KAYAK’s flight Price Forecast tool uses historical data to determine whether the price for a flight to Seattle from Baltimore is likely to change within 7 days, so travelers know whether to wait or book now.

  • What is the Hacker Fare option on flights from Baltimore to Seattle?

    Hacker Fares allow you to combine one-way tickets in order to save you money over a traditional round-trip ticket. You could then fly to Seattle with an airline and back to Baltimore with another airline. Booking your flights between Baltimore and SEA can sometimes prove cheaper using this method.

  • What is KAYAK's "flexible dates" feature and why should I care when looking for a flight from Baltimore to Seattle?

    Sometimes travel dates aren't set in stone. If your preferred travel dates have some wiggle room, flexible dates will show you all the options when flying to Seattle from Baltimore up to 3 days before/after your preferred dates. You can then pick the flights that suit you best.

KAYAK’s top tips for finding a cheap flight from Baltimore to Seattle

  • Looking for a cheap flight? 25% of our users found flights on this route for $230 or less one-way and $427 or less round-trip.
  • The Baltimore Washington Thurgood Marshall Airport (BWI) serves as the primary hub for Southwest Airlines. The Seattle-Tacoma International Airport (SEA) is a hub for Delta Airlines and Alaska Airlines.
  • BWI serves the metropolitan areas of both Baltimore, Maryland, and Washington DC. These cities are about 40 miles apart. BWI is about 20 to 30min away from the city of Baltimore. On the other hand, BWI is about 1h 20min away from Washington DC.
  • To get from SEA into downtown Seattle, find your way to the SEA Parking Garage and go to the 4th floor, where the Light Rail Train Station is located. Take Light Rail #1, and this train can take you to many places throughout the Seattle metropolitan area.
  • If your muscles are feeling sore when you land at SEA and you want to ease the kinks out, you can enjoy the massage and relaxation services offered by the Spa Terminal Getaway in SEA. This spa is located on Concourse A at Gate A5.
  • If you are waiting for a ride at SEA and have children with you, you might want to stop by the popular Kids’ Play Area at SEA, located between Concourses A and B. As the kids have fun with the oversized toys with airplane and airport themes, parents can relax and reboot on the nearby seating provided.

Prefer to fly direct from Baltimore to Seattle?

 
Direct data is based off flight results for the next 60 days. Find direct flights from all airlines flying direct from Baltimore/Washington to Seattle/Tacoma Intl.
Find which airlines fly direct from Baltimore/Washington Airport to Seattle/Tacoma Intl Airport, which days they fly and book direct flights.

Direct departures

Baltimore/Washington to Seattle/Tacoma Intl

Monday

Alaska Airlines,Southwest

Alaska Airlines,Southwest

Tuesday

Alaska Airlines,Southwest

Alaska Airlines,Southwest

Wednesday

Alaska Airlines,Southwest

Alaska Airlines,Southwest

Thursday

Alaska Airlines,Southwest

Alaska Airlines,Southwest

Friday

Alaska Airlines,Southwest

Alaska Airlines,Southwest

Saturday

Alaska Airlines,Southwest

Alaska Airlines,Southwest

Sunday

Alaska Airlines,Southwest

Alaska Airlines,Southwest

See more direct flights

Direct returns

Seattle/Tacoma Intl to Baltimore/Washington

Monday

Alaska Airlines,Southwest

Alaska Airlines,Southwest

Tuesday

Alaska Airlines,Southwest

Alaska Airlines,Southwest

Wednesday

Alaska Airlines,Southwest

Alaska Airlines,Southwest

Thursday

Alaska Airlines,Southwest

Alaska Airlines,Southwest

Friday

Alaska Airlines,Southwest

Alaska Airlines,Southwest

Saturday

Alaska Airlines,Southwest

Alaska Airlines,Southwest

Sunday

Alaska Airlines,Southwest

Alaska Airlines,Southwest

See more direct flights

Reviews of the top 5 airlines serving from Baltimore to Seattle

 
See real verified KAYAK customer reviews for airlines flying from Baltimore to Seattle. Airline scores are aggregated from all reviews left by passengers on KAYAK after flying with an airline. KAYAK doesn’t show reviews that are older than 5 years. Learn how KAYAK collects reviews.
Need help choosing which airline to fly with from Baltimore to Seattle? KAYAK airline reviews give an overall score for each airline based on loads of factors, including comfort, boarding, in-flight entertainment and more, to make your decision easier. See airline scores according to verified KAYAK customer reviews.
8.0
SouthwestOverall score based on 4262 reviews
8.1Boarding
7.0Food
8.0Comfort
7.5Entertainment
8.6Crew
Airline reviews

The first time I flew in the extra legroom section. It was difficult to notice a difference. I had bad luck with my neighbors. The crew was okay. Southwest has reduced the live TV options.

4.0 OkayAnonymous, May 2026
MDW - LAX
Read more Southwest reviews

The first time I flew in the extra legroom section. It was difficult to notice a difference. I had bad luck with my neighbors. The crew was okay. Southwest has reduced the live TV options.

The flight was smooth. The Southwest experience has degraded overall, but this one was okay.

No gluten free snacks. Seats felt worn or bare bones even though it was a new 737 MAX 8.

One major problem that was very unprofessional and uncalled for. Plane landed and we had to wait 20 minutes to get off the plane since they were waiting for someone to come to the gate to drive the jetway. Southwest couldn't have someone available and waiting for the plane to land? Is there only one person in Hobby airport who knows to drive the jetway? Was he at lunch? In the bar? Uncomfortable and uncalled for!

The checking experience in Orlando was terrible, almost missed the flight. Too many travelers and Southwest completely understaffed.

I'm glad it wasn't only 75% full because I could get a good seat

if I was good. Not happy that I have to pay extra money to get the seat I need for lake room, but I guess that’s a sign of the times.

Seats were very comfortable. They tilted back. Drinks and snacks were free and served 3 times. Attendants were awesome.

Plane was clean and comfortable. Flight attendants and gate staff were professional, friendly and efficient. Boarding and deplaning were orderly and efficient. All in all, the typical excellent Southwest experience.

Truly terrible. Will never willingly fly southwest again. Seats are worse than before they switched to assigned seating. One flight attendant was the opposite of helpful (rude, unhelpful, dismissive, and as my stranger seatmate said unprompted: a total prick). This caused me, 15 minutes into the flight, to book an alternate return flight home on a competing airline (first class 1.2k purchase instead of my existing planned flight) just so I would not have to ever be on that aircraft, with that terrible service person, with those horrific seats ever again.

It was efficient and great. DIA took a while to let us leave but other than that it was great.

90 minute delay boarding the plane, 45 minute delay on the terminal, 2 hours late arriving, currently waiting 45 minutes on the tarmac for a gate so we can BEGIN deboarding. Absolute mess. Definitely will be my last flight with Alaska.

Extremely professional crew there are very friendly and first class. Everything worked well on the plane. Food was to be expected. Drinks were very good. Shout out to Charlie in first class who was an excellent flight attendant.

The plug in for my charger didn’t work and on my return flight back home the passenger in the window seat got up seven times

The boarding pass had no gate published and there are many fewer large boards with arrivals and departures I almost missed my flight trying to find the gate

Everyone was so kind, flight was wonderful, check in and baggage were easy. Thank you guys so much for a great trip

For such a long flight, Tampa to Seattle, was shocked to learn that no food was served. Also, there were no TV monitors to be able to watch a movie.

The staff at the check-in counter was responsive to the long queue and intervened to redirect the traffic: foreigners can't complete check-in without human agents; that is the real line which moves quickly enough. On-boarding and off-boarding were smooth and civilized. Overall the operations were efficient and the experience was pleasant.

Ok, but nothing special. Long flight with no blanket/pillow set.

Flight was delayed by 3 hrs. Forcing missed connection and overnight stay. Terrible.

No service flight that took 5 hrs and a stop at an unscheduled airport. Crew and pilots did their jobs

Clean planes and not take my comfort class seat away.

Weather caused a long delay, but the efficiency and updates from the pilot were helpful. We were able to make our connection fortunately.

Planes were clean, no water or snacks on either flight.

Free & relatively fast Wi-Fi. Would've liked a wider drink selection.

I continue to be satisfied with Delta’s excellent service out of LGA. The digit id works well and gets me through security in no time. Whenever possible, I choose Delta.

Was revoked with Jet Blue due to delay from Kenya Air

Enjoyed it very much. Especially liked the free WiFi that Delta offers.

Smooth flight. Left on time, and got in 15 minutes early. Onboard video was great

Much better than I expected. I had an economy ticket so I was really happy the flight was so comfy and the service so generous. Passengers were all polite too.

These airplanes should be illegal. The seats are two tight, it is a safety issue. Wheelchair support was ridiculously slow. We almost missed our flight.

It was a short flight so I was expecting too much

Horrifying Almost 2 million miles. Bring your own food and drink. One coffee or drink every three hours. Have to order meals on app more than 24 hours ahead Tiny and dirty bathrooms

Flight was delayed but more than 90 minutes. This caused me to miss my available windows for pick-up by a friend. I had to pay $125 for an uber back home from the airport which was an added expense that I had not budgeted for my trip. Staff was friendly.

Seat pitch is horrible especially on the 15 hour flight. Gate crew at SFO was Outstanding. The flight crew was also great.

Had a one hour delay due to mechanical issue. I didn’t think I’d be able to make my connecting flight, but they waited for me and greeted me when I arrived to help things run smooth.

6 1/2 hours from Tampa to SFO on a Boeing 737. Cramped. No Service. No real food. One pass for coffee at the beginning and a second pass THREE hours later. And check-in in Tampa was nasty even by United standards. And I am at almost TWO million miles on United. It's a non-stop. But terrible service.

MY FAMILY'S LUGGAGE WAS LOST FROM ROME TO BARI. I WAS THE ONLY ONE THAT RECEIVED MY LUGGAGE FROM ROME TO BARI. AFTER DEPLANING IN BARI, WE WASTED A LOT OF TIME AT BAG CLAIMS LOST AND FOUND REPORTING THE CLAIM AND PLEADING FOR THE BAGS TO BE DELIVERED THE NEXT DAY. WE WERE TOLD THAT IT TAKES 3 DAYS MINIMUM TO DELIVER. MY DAUGHTER AND MY GIRLFRIEND NEEDED THEIR PERSONAL THINGS AND WE WERE STAYING 3 HOURS AWAY FROM THE BARI AIRPORT. WE HAD TO DRIVE 3 HOURS TO THE AIRPORT TO COLLECT OUR LOST LUGGAGE THE NEXT DAY. WE ARE NOT HAPPY WITH THE EXPERIENCE

We had a delay, but thankfully I made it to my connection. Overall it went smooth

The flight had a delay but I made it to my connection. Flight was smooth overall

Was put into a seat right behind the toilet that had no entertainment possible but did have plenty of leg room over noisy part of plane.

Movies on my phone are great. It would be nice to have a gluten free snack option.

It was what i expected. I like the movies you can access from your phone. It would be nice if there was a gluten free snack offered. But I did bring my own snack knowing there would not be a gluten free option

The flight was peaceful, just s slight turbulence, pilots and crews were all nice and made a great job! Arrived safely in the Philippines. Thank you ya’ll!

Ontario airport boarding was very easy to park and access, is clean and TSA took 10 minutes total. Check-in was a breeze and cruise was very nice.

American Airlines II: Delay Boogaloo. Multiple gate changes, delays, boarded and then MORE delays. I hate to say this won’t matter, but posting stuff about major corporations in 2026 is a post-modern “scream into the void.” Was multiple hours late coming home, so there you go.

Awful, tons of delays, I got into Chicago multiple hours late meaning I hit the very traffic I tried so desperately to avoid. Just empty apologies from American Airlines text alerts. Trash behavior from a trash airline.

The flight attendants were very friendly, efficient, and helpful. The plane was ahead of schedule, and it all went very smoothly. Thank you.

They lost my baggage and I am still struggling to the information and update

We got delayed getting out of DFW for broken overhead bins. Once the flight got underway the captain kept the seatbelt sign lit the entire flight despite little perceptible turbulence, preventing use of the rest rooms and any sort of refreshment service in the main cabin.

Everything you need to know for your flight from Baltimore to Seattle

Information on your arrival and departure airports