Plan to arrive at SEA two hours before your flight. Use SEA Spot Saver for security appointments to reduce wait times.

Most accurate provider | CheapOair 3 stars |
|---|---|
Most trusted provider | CheapOair 3 stars |
Round-trip from | $267 (Alaska Airlines) |
One-way from | $156 (Kiwi.com) |
Popular in | December |
Cheapest in | January |
Average price | $487 |
Good round-trip deal | $357 or less |
Good one-way deal | $184 or less |
Fly from
Fly to
Route
Depart
Return
Price
SeattleBoston
SEA - BOS
SEABOS
Seattle/Tacoma Intl
Thu 1/8
5:55 pm-11:59 am
1 stop15h 04m
Boston Logan Intl
Sat 1/10
7:15 am-10:45 am
Nonstop6h 30m
SeattleBoston
SEA - BOS
SEABOS
Seattle/Tacoma Intl
Wed 5/13
11:30 am-8:05 pm
Nonstop5h 35m
Boston Logan Intl
Sat 5/16
1:00 pm-8:53 pm
1 stop10h 53m
SeattleBoston
SEA - BOS
SEABOS
Seattle/Tacoma Intl
Tue 5/12
11:30 am-8:05 pm
Nonstop5h 35m
Boston Logan Intl
Sun 5/17
1:00 pm-8:53 pm
1 stop10h 53m
SeattleBoston
SEA - BOS
SEABOS
Seattle/Tacoma Intl
Wed 2/4
3:40 pm-11:54 pm
Nonstop5h 14m
Boston Logan Intl
Mon 2/9
7:00 am-10:34 am
Nonstop6h 34m
SeattleBoston
SEA - BOS
SEABOS
Seattle/Tacoma Intl
Sat 3/7
10:20 pm-6:48 am
Nonstop5h 28m
Boston Logan Intl
Sat 3/21
6:42 pm-10:05 pm
Nonstop6h 23m
SeattleBoston
SEA - BOS
SEABOS
Seattle/Tacoma Intl
Wed 12/31
11:00 pm-7:29 am
Nonstop5h 29m
Boston Logan Intl
Wed 1/7
5:20 pm-8:44 pm
Nonstop6h 24m
SeattleBoston
SEA - BOS
SEABOS
Seattle/Tacoma Intl
Wed 1/14
7:15 am-9:23 pm
1 stop11h 08m
Boston Logan Intl
Wed 1/21
5:20 pm-8:44 pm
Nonstop6h 24m
SeattleBoston
SEA - BOS
SEABOS
Seattle/Tacoma Intl
Mon 5/11
11:30 am-8:05 pm
Nonstop5h 35m
Boston Logan Intl
Fri 5/15
7:00 am-10:20 am
Nonstop6h 20m
SeattleBoston
SEA - BOS
SEABOS
Seattle/Tacoma Intl
Thu 5/28
3:55 pm-12:23 am
Nonstop5h 28m
Boston Logan Intl
Mon 6/1
6:35 pm-10:05 pm
Nonstop6h 30m
SeattleBoston
SEA - BOS
SEABOS
Seattle/Tacoma Intl
Sun 1/11
10:25 pm-6:50 am
Nonstop5h 25m
Boston Logan Intl
Fri 1/16
6:45 pm-10:13 pm
Nonstop6h 28m
| Provider | Price Accuracy | Trust Score* |
|---|---|---|
| Price Accuracy2 stars | Trust Score*3 stars | |
| Price Accuracy3 stars | Trust Score*1 star | |
| Price Accuracy3 stars | Trust Score*3 stars | |
| Price Accuracy3 stars | Trust Score*3 stars | |
| Price Accuracy3 stars | Trust Score*2 stars | |
| Price Accuracy- | Trust Score*1 star | |
| Price Accuracy3 stars | Trust Score*3 stars | |
| Price Accuracy- | Trust Score*1 star |
Booking 70 days in advance of your planned departure date is, on average, the best time to get cheap flights from Seattle to Boston. The general trend is that the closer you book to the departure date, the more expensive your flight will be.
Currently, January is the cheapest month in which you can book a flight from Seattle to Boston (average of $98). Flying from Seattle to Boston in August is currently the most expensive (average of $178). There are several factors that can impact the price of a flight, so comparing airlines, departure airports and flight times can provide users with more options.
Unlike in the morning, when flights are generally more expensive, you can save up to 32% on flights from Seattle to Boston by exploring options for tickets at noon.
Travelers seeking maximum savings on their Seattle to Boston flight should consider departing on Wednesday at noon when fares are most often at their lowest. Monday mornings flights should be avoided if possible as fares are typically the most expensive at this time.
About 17% of weekly flights between Seattle and Boston have experienced delays in the past year, with the average delay time being 164 minutes.
Historically, flights departing at night are less likely to be delayed, whereas flights leaving in the early afternoon tend to experience delays more often.
Tuesday tends to have the lowest number of delays on this route, whereas Thursday has historically faced a higher average of delays compared to other days of the week.
Over the last year, Delta have had the lowest number of delays on this route, with just 10% of flights being delayed.
Food
Crew
Boarding
Overall
Entertainment
Comfort
Reviews
Anonymous,Sep 2025
SEA - MKE
Food
Crew
Boarding
Overall
Entertainment
Comfort
Reviews
Anonymous,Sep 2025
SEA - MKE
Food
Crew
Boarding
Overall
Entertainment
Comfort
Reviews
Anonymous,Sep 2025
SEA - MKE
Food
Crew
Boarding
Overall
Entertainment
Comfort
Reviews
Anonymous,Sep 2025
SEA - MKE
Food
Crew
Boarding
Overall
Entertainment
Comfort
Reviews
Anonymous,Sep 2025
SEA - MKE
Food
Crew
Boarding
Overall
Entertainment
Comfort
Reviews
Anonymous,Sep 2025
SEA - MKE
| Airline | Cheapest | Average | Flexibility | On-time |
|---|---|---|---|---|
| Cheapest$118 | Average$352 | FlexibilityNo cancel fee | On-time85% | |
| Cheapest$141 | Average$328 | FlexibilityNo cancel fee | On-time62% | |
| Cheapest$158 | Average$379 | FlexibilityNo cancel fee | On-timeN/A | |
| Cheapest$178 | Average$361 | FlexibilityNo cancel fee | On-time69% | |
| Cheapest$196 | Average$372 | FlexibilityNo cancel fee | On-time71% | |
| Cheapest$221 | Average$445 | FlexibilityNo cancel fee | On-time83% | |
| Cheapest$231 | Average$458 | FlexibilityNo cancel fee | On-time75% | |
| Cheapest$281 | Average$340 | FlexibilityNo cancel fee | On-time63% |