domestic · 5h 10m · 4,020 km
Seattle to Boston
3 airlines · 3 aircraft ranked
JetBlue is the only carrier offering business class on this route, scoring 7.7/10.In economy, JetBlue's Core (A321LR) leads the field with a 5.7/10.
Quick pick
Fly JetBlue. It scores higher across seat comfort and amenities.
If prices are similar, go with this one.
Fly Alaska. It has 2 more inches of legroom.
If fares are comparable, this is the better cabin.
Select two airlines to compare head-to-head
Data verified June 2026
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Route insights
- JetBlue is the only carrier offering business class on this route, scoring 7.7/10.
- In economy, JetBlue's Core (A321LR) leads the field with a 5.7/10.
- In first class, Alaska's First Class (737-900ER) edges out the field with a 2.8/10.
Frequently asked
Which is better in first: Alaska or Delta on SEA-BOS?
First Class (Alaska Airlines, 737-900ER) and Delta First Class (Delta Air Lines, A321neo) score virtually the same in first: 2.8 vs 2.8/10. The biggest gap is seat type — recliner vs recliner — but neither carrier pulls ahead overall.
Which is better in economy: Alaska or Delta on SEA-BOS?
Main Cabin (Alaska Airlines, 737-900ER) and Main Cabin (Delta Air Lines, A321neo) score virtually the same in economy: 4.4 vs 4.6/10. The biggest gap is seat width — 18"-wide seats vs 17.5" — but neither carrier pulls ahead overall.
Which is better in economy: Alaska or JetBlue on SEA-BOS?
Core (JetBlue Airways, A321LR) beats Main Cabin (Alaska Airlines, 737-900ER) in economy, scoring 5.7/10 vs 4.4. The deciding factor: AC + USB-C vs USB-C only.
Which is better in economy: Delta or JetBlue on SEA-BOS?
Core (JetBlue Airways, A321LR) beats Main Cabin (Delta Air Lines, A321neo) in economy, scoring 5.7/10 vs 4.6. The deciding factor: AC + USB-C vs USB-C only.
What are the best seats in Alaska First Class on SEA-BOS?
Best: Row 1 for maximum legroom. Window seats in rows 1-2 are quiet and private. Avoid: Row 4 (last row of first) may have limited meal choices due to service order. 41-inch pitch is among the best domestic first class products in the US. No seatback IFE screens; stream to personal devices via Gogo 2Ku Wi-Fi. USB-A and AC outlet under center armrest. Free for T-Mobile customers. Pre-order meals system with limited choices.
What are the best seats in Alaska Main Cabin on SEA-BOS?
Best: Exit row seats (row 15/16) offer extra legroom. Avoid: Last row (34) has limited recline and is near the lavatory. Middle seats throughout. Standard domestic economy with 31-inch pitch. USB-A and AC power at every seat. No seatback screens; entertainment streams to personal devices. Boeing Sky Interior with larger overhead bins. Exit row seats on the 737 offer extra legroom but do not recline. The row immediately before the exit also has limited recline due to clearance requirements.
What are the best seats in Delta Delta First Class on SEA-BOS?
Best: Row 1 has the most legroom as a bulkhead. 1A and 1D are window seats with the most privacy. All first class seats have memory foam cushioning. Avoid: Row 5 is closest to the Delta Comfort+ cabin and the forward galley/lavatory. Seat 5B and 5C are more exposed to foot traffic. Recaro CL4710 recliner seats with winged headrests for privacy. 13-inch HD touchscreen seatback IFE at every seat. USB and AC power at every seat. Exclusive forward lavatory for first class. Complimentary drinks and snacks, upgraded meal service on longer flights.
What are the best seats in Delta Main Cabin on SEA-BOS?
Best: Delta Comfort+ rows (approximately 10-19, 60 seats) offer 33-34 inches of pitch with priority boarding, dedicated overhead bins, and complimentary premium snacks/drinks. Row 10 bulkhead has the most legroom. Avoid: Rows near the mid-cabin lavatory area (around rows 10-12) may experience traffic and noise. Last 2 rows near rear lavatories. Middle seats (B and E) throughout. 60 of the 174 economy seats are Delta Comfort+ with 33-34 inches of pitch. Remaining 114 Main Cabin seats have 31 inches of pitch. 10-inch seatback IFE at every seat. Collins Aerospace Meridian slimline seats. Delta Sync free Wi-Fi for SkyMiles members. Exit row seats on the A320/A321 family offer extra legroom but do not recline. The row immediately before the exit also has limited recline due to clearance requirements.
What are the best seats in JetBlue Mint on SEA-BOS?
Best: 1A and 1F are both Mint Studios with extra shoulder width, a secondary buddy seat that extends the bed area, and the largest screen in the cabin at 22 inches Avoid: Neither Studio seat has meaningful disadvantages; both are the premium pick Mint Studios cost an upcharge over standard Mint Suites. The buddy seat folds out to extend the sleeping surface and can seat a companion during meal service. Studio passengers get the same meal service as Suites.
What are the best seats in JetBlue Core on SEA-BOS?
Best: Even More Space rows 14-17 offer 35-37 inches of pitch for an upcharge. Exit rows provide up to 41 inches. Avoid: Last rows (30-31) near the rear galley and lavatory. Middle seats (B, E) in any row. JetBlue economy on transatlantic flights includes complimentary snacks, drinks, and a meal. All passengers get free unlimited WiFi and seatback IFE with 10.1-inch screens. Even More Space seats are a separate purchase with extra legroom. Power includes AC outlet and USB-A at every seat. Exit row seats on the A320/A321 family offer extra legroom but do not recline. The row immediately before the exit also has limited recline due to clearance requirements.