United MileagePlus award flights from Seattle (SEA) to Boston (BOS)
In the last 30 days AwardTool saw United MileagePlus award space for SEA→BOS in economy, premium economy, business class and first class. Lowest economy: 15,000 miles + $5.60 (economy space on 325 dates). Lowest business class: 100,000 miles + $5.60 (business-class space on 84 dates). Lowest first class: 58,700 miles + $5.60 (first-class space on 325 dates).
Prices observed – ; newest observation .
Page regenerated from the Oct 16, 2026 data snapshot (normally daily). Summary last changed . Seats change quickly.
- Lowest economy
- 15,000 miles + $5.60
- economy space on 325 dates
- Lowest business class
- 100,000 miles + $5.60
- business-class space on 84 dates
- Lowest first class
- 58,700 miles + $5.60
- first-class space on 325 dates
- Lowest premium economy
- 100,000 miles + $5.60
- premium economy space on 91 dates
MileagePlus award prices by cabin
The lowest one-way United MileagePlus award AwardTool observed on SEA→BOS in each cabin, in miles plus taxes.
| Cabin | Points + taxes | Stops | Airlines seen | Seats | Dates seen | Newest observation | |
|---|---|---|---|---|---|---|---|
| Economy | 15,000 miles + $5.60 | 1 stopNonstop from 35,000 pts | JetBlue (B6), United Airlines (UA) | 9+ | 325 | See dates | |
| Premium Economy | 100,000 miles + $5.60 | 2 stops | United Airlines (UA) | 9+ | 91 | See dates | |
| Business | 100,000 miles + $5.60 | 2 stops | United Airlines (UA) | 2 | 84 | See dates | |
| First | 58,700 miles + $5.60 | 1 stop | JetBlue (B6), United Airlines (UA) | 9+ | 325 | See dates |
Not seen means AwardTool hasn't observed this cabin on this route in the last 30 days. It doesn't mean the airline has no seats. Dates seen counts departure dates with an open award in that cabin at any price; newest observation is the latest time AwardTool saw one of them. Seats is the count the program reported when we observed it; some programs report at most 9.
Observed MileagePlus award examples
| Departure | Cabin | Points + taxes | Seats | Stops | Observed (UTC) | |
|---|---|---|---|---|---|---|
| Economy | 15,000 miles + $5.60 | 9+ | 1 stop | Check this date | ||
| Economy | 15,000 miles + $5.60 | 9+ | 1 stop | Check this date | ||
| Economy | 15,000 miles + $5.60 | 9+ | 1 stop | Check this date | ||
| Premium Economy | 100,000 miles + $5.60 | 9+ | 2 stops | Check this date | ||
| Business | 100,000 miles + $5.60 | 5 | 2 stops | Check this date | ||
| First | 58,700 miles + $5.60 | 9+ | 1 stop | Check this date | ||
| First | 58,700 miles + $5.60 | 9+ | 1 stop | Check this date | ||
| First | 58,700 miles + $5.60 | 8 | 1 stop | Check this date |
Prices are one-way per traveler: the program's points or miles plus taxes and carrier fees in USD, as AwardTool observed them in the observation window. Award space changes constantly. A seat we saw may be gone, and space we haven't seen may exist. Always confirm with a live search before transferring points; most transfers can't be reversed.
How often MileagePlus award space showed up
Departure dates in the next 365 days that AwardTool checked for United MileagePlus in the last 30 days, how many had award space in each cabin at any price, and the latest departure with space.
| Cabin | Dates with space | Share of dates checked | Latest departure with space |
|---|---|---|---|
| Economy | 325 of 325 | 100% | |
| Premium Economy | 91 of 325 | 28% | |
| Business | 84 of 325 | 25% | |
| First | 325 of 325 | 100% |
Best months to fly from Seattle (SEA) to Boston (BOS) with MileagePlus
| Month | Economy | Premium Economy | Business | First |
|---|---|---|---|---|
| 15,000 (16 dates) | — | — | 58,700 (16 dates) | |
| 15,000 (30 dates) | 100,000 (1 date) | 120,000 (1 date) | 58,700 (30 dates) | |
| 15,000 (31 dates) | 100,000 (28 dates) | 100,000 (26 dates) | 60,800 (31 dates) | |
| 15,000 (31 dates) | 100,000 (31 dates) | 100,000 (30 dates) | 60,800 (31 dates) | |
| 15,000 (28 dates) | 100,000 (28 dates) | 100,000 (26 dates) | 60,800 (28 dates) | |
| 15,000 (31 dates) | 100,000 (3 dates) | 100,000 (1 date) | 60,800 (31 dates) | |
| 15,000 (30 dates) | — | — | 63,400 (30 dates) | |
| 15,000 (31 dates) | — | — | 63,400 (31 dates) | |
| 15,000 (30 dates) | — | — | 63,400 (30 dates) | |
| 15,000 (31 dates) | — | — | 63,400 (31 dates) | |
| 15,000 (31 dates) | — | — | 63,400 (31 dates) | |
| 15,000 (5 dates) | — | — | 71,900 (5 dates) |
How to get MileagePlus miles
- Bilt Rewards: 1:1 · Instant
- Chase Ultimate Rewards: 1:1 · Instant
Check current transfer bonuses. Most transfers can't be reversed.
MileagePlus vs other programs from Seattle (SEA) to Boston (BOS)
Lowest one-way award per program and cabin on this route.
| Program | Economy | Premium Economy | Business | First |
|---|---|---|---|---|
| Air Canada Aeroplan | 17,500 pts + $32.96 | — | — | 30,000 pts + $32.96Mixed cabin |
| Air France/KLM Flying Blue | 18,500 pts + $31.17 | — | 51,500 pts + $36.77 | — |
| Alaska Atmos Rewards | 12,500 pts + $5.60Lowest | — | — | 30,000 pts + $5.60 |
| American Airlines AAdvantage | 12,500 pts + $5.60 | 22,500 pts + $5.60Lowest | 25,000 pts + $5.60Lowest | 25,000 pts + $5.60Lowest |
| Avianca LifeMiles | 15,000 pts + $58.00 | — | — | — |
| Delta SkyMiles | 15,400 pts + $5.60 | — | — | 61,600 pts + $5.60 |
| Etihad Guest | 28,000 pts + $34.30 | — | 48,000 pts + $57.60Mixed cabin | — |
| JetBlue TrueBlue | 15,400 pts + $5.60 | — | — | — |
| Qantas Frequent Flyer | 23,300 pts + $5.60 | 64,400 pts + $5.60 | 52,800 pts + $5.60Mixed cabin | 118,700 pts + $5.60Mixed cabin |
| Qatar Airways Privilege Club | 16,000 pts + taxes not reported | — | 43,000 pts + taxes not reported | — |
| United MileagePlus | 15,000 pts + $5.60 | 100,000 pts + $5.60 | 100,000 pts + $5.60 | 58,700 pts + $5.60 |
| Virgin Atlantic Flying Club | 22,000 pts + $5.60 | — | — | 70,000 pts + $5.60 |
| Virgin Australia Velocity | 23,500 pts + $9.53 | — | 58,000 pts + $89.66 | — |
Questions about MileagePlus award flights from Seattle (SEA) to Boston (BOS)
How many miles do you need to fly from Seattle (SEA) to Boston (BOS) with United MileagePlus?
The lowest one-way United MileagePlus awards AwardTool observed in the last 30 days (newest observation Oct 15, 2026): economy 15,000 miles + $5.60, the lowest price in each of 12 months, with award space on 325 departure dates; premium economy 100,000 miles + $5.60, the lowest price in each of 5 months, with award space on 91 departure dates; business class 100,000 miles + $5.60, with monthly lows of 100,000 miles in 4 months and 120,000 miles in 1 month, and award space on 84 departure dates; first class 58,700 miles + $5.60, with a typical monthly low of 60,800 miles over 12 months and award space on 325 departure dates. Monthly lows varied in business class (100,000 to 120,000 miles) and first class (58,700 to 71,900 miles), so the award on your dates may cost more. Search live before transferring points.
What's the lowest MileagePlus award from Seattle (SEA) to Boston (BOS)?
In economy, 15,000 miles + $5.60. Seen Oct 10, 2026, 16:56 UTC for an Oct 18, 2026 departure. United MileagePlus showed economy award space on 325 departure dates at any price (newest observation Oct 15, 2026, 16:28 UTC). In business class, 100,000 miles + $5.60. Seen Oct 10, 2026, 16:59 UTC for a Dec 4, 2026 departure. United MileagePlus showed business-class award space on 84 departure dates at any price (newest observation Oct 15, 2026, 16:28 UTC). Search live before transferring points.
Can you book nonstop awards from Seattle (SEA) to Boston (BOS) with MileagePlus?
Yes. AwardTool observed nonstop United MileagePlus award space in economy from 35,000 miles.
Which credit card points can book MileagePlus awards from Seattle (SEA) to Boston (BOS)?
Bilt Rewards (1:1, Instant) and Chase Ultimate Rewards (1:1, Instant). Check current transfer bonuses; most transfers can't be reversed.
Which months had the lowest MileagePlus award prices from Seattle (SEA) to Boston (BOS)?
Counting only month prices from programs with award space on 2 or more dates that month, and leaving out unusually low outliers, the lowest economy award AwardTool observed was for Dec 2026 departures: 15,000 miles (31 dates). The month table shows every lowest price, including those. Based on dates we observed, not a forecast.