Flights Boston → San José (Alajuela)
As of October 2026, economy flights from Boston to San José (Alajuela) have a typical range USD 717–1473, median USD 1073. Full range across all 205 offers: USD 458–6209. We analyzed 205 offers from 11 airlines in a single price check.
Preview snapshot — prices change. Search for live results.
Data collected by LetsFG's multi-source price checks — every airline and the major booking sites checked for this route. How we collect data →
Best offers by airline: Boston → San José (Alajuela)
Based on 205 offers · October 2026. Prices and availability change — run a live search to confirm.
Bag & seat fees: Boston → San José (Alajuela)
Add-on pricing from the cheapest available offer per airline · October 2026 · USD
| Airline | Carry-on | Checked bag | Seat selection |
|---|---|---|---|
| United Airlines | — | USD 35 | — |
| Volaris | USD 250 | USD 500 | — |
| jetBlue | Included | USD 35 | — |
| Air Canada | Included | USD 30 | — |
| American Airlines | Included | USD 35 | — |
| Avianca | Included | USD 30 | — |
| Copa | Included | USD 40 | — |
| Southwest Airlines | Included | Included | — |
| Delta | Included | USD 35 | — |
Fees are estimates from the prices we checked and may not reflect your specific itinerary, booking class, or payment method. Run a live search for exact pricing.
How much do flights from Boston to San José (Alajuela) cost?
Based on 205 offers · October 2026
Boston to San José (Alajuela) flights ranged from USD 458 to USD 6209 across 205 offers analyzed in October 2026. The chart below shows how prices distributed across all 205 offers.
These 205 offers (October 2026) span multiple departure dates and booking windows — your travel dates may fall anywhere in this distribution. Only a live search shows where your specific trip lands.
50% of offers priced between USD 877 and USD 1302
What hidden fees do Boston to San José (Alajuela) flights charge?
Ancillary fees — bags, seat selection, and payment surcharges — can add 10–25% to the base fare on Boston to San José (Alajuela) routes. The breakdown below is based on 205 offers analyzed in October 2026.
| Carrier | Avg fee (USD) | % of base fare |
|---|---|---|
| UA | 41 | 4% |
| Y4 | 313 | 34% |
| B6 | 23 | 2% |
| AC | 37 | 4% |
| AA | 45 | 4% |
| AV | 40 | 4% |
| CM | 55 | 6% |
| WN | 0 | 0% |
| DL | 50 | 2% |
Volaris: base ~USD 659 + fees USD 313 = ~USD 972 total. B6: base ~USD 1450 + fees USD 23 = ~USD 1473 total.
Volaris's USD 313 ancillary fees narrow the gap with B6's lower-fee model — the USD 791 base difference shrinks to USD 501 after fees. Always compare total cost, not just the advertised base fare.
Estimates based on median total minus average ancillary fee. Actual base fares vary by itinerary.Fee levels vary significantly across carriers on this route — some carriers charge 50%+ above the base fare in ancillary fees.
Run your search to see itemized fees for your itineraryWhich airline is cheapest from Boston to San José (Alajuela)?
11 airlines flew Boston to San José (Alajuela) in this dataset. Knowing the airline isn't enough — the typical fare range below shows how far prices swing on each one. Median and range include all fees we recorded.
Even on the cheapest airline (United), fares ranged USD 617–741 in this snapshot. Your exact price depends on your dates and how far ahead you book — run a live search to see your number →
| Airline | Offers | Typical range (USD) | Median (USD) | Fees (USD) |
|---|---|---|---|---|
 United | 12 | 617–741 | 711 | n/a |
 Copa Airlines | 12 | 901–1131 | 948 | 55 (6%) |
 Volaris | 9 | 721–1188 | 972 | 313 (32%) |
 Avianca | 4 | 794–1237 | 974 | 40 (4%) |
 AM | 6 | 969–1188 | 1035 | n/a |
 United Airlines | 72 | 656–1272 | 1049 | 41 (4%) |
 Air Canada | 33 | 782–1196 | 1068 | 37 (3%) |
 Southwest Airlines | 7 | 1072–1399 | 1302 | 0 (0%) |
 American Airlines | 9 | 967–1435 | 1415 | 45 (3%) |
 Delta Air Lines | 8 | 1434–2867 | 1435 | 50 (3%) |
 B6 | 33 | 997–1862 | 1473 | 23 (2%) |
Where do the best Boston → San José (Alajuela) prices come from?
We checked direct airlines, travel agencies, and meta-search for this route. On this route the lowest median came from meta-search sources, but the cheapest channel shifts by route and date — which is exactly why a live search across all of them wins.
We compare every airline and the major booking sites but never disclose which — that's our edge. Prices are the ones we observed and aren't official data from any platform. Run a live search and we bring you the cheapest, wherever it is.
Key facts: Boston to San José (Alajuela) flights
- Full-service carriers on Boston–San José (Alajuela) cost 0.8x more than budget airlines (USD 1067 vs USD 1388 median; overall median USD 1073).
- Y4 charges 13.5x more in ancillary fees than B6 — USD 313 vs USD 23 avg per booking.
- The same route priced USD 732 apart depending on where it was booked — the lowest median was USD 643. We search every airline and the major booking sites at once so you always see that lowest price.
Frequently asked questions
- How much does a flight from Boston to San José (Alajuela) cost?
- Based on 205 offers analyzed, Boston to San José (Alajuela) flights range from USD 458 to USD 6209, with a median price of USD 1073. Search for your specific dates →
- What hidden fees should I expect on Boston to San José (Alajuela) flights?
- On average, ancillary fees (bags, seat selection) add USD 50 to the base fare on Boston to San José (Alajuela) flights. See itemized fees for your itinerary →
- Which airline is cheapest on Boston to San José (Alajuela) including all fees?
- United has the lowest median fare on Boston to San José (Alajuela) at USD 711 (median across 12 offers in our snapshot). Check which airline wins on your dates →
- Which booking site has the cheapest Boston–San José (Alajuela) flights?
- It depends on your dates — no single site is always cheapest. We search every airline and the major booking sites at once (travel agencies and meta-search included) and surface whichever is lowest; the best median in this snapshot was USD 643. Run a live search and we'll find the cheapest for you →
- Why do prices vary so much on Boston to San José (Alajuela) routes?
- Boston to San José (Alajuela) has 11 airlines competing, creating a price range from USD 458 to USD 6209 across 205 offers. Prices on this route change with booking timing, advance purchase, and ancillary add-ons. Find where your trip lands in the distribution →
11 airlines compete on this route — we check every one
Find flights for my datesNew route — be among the first to track this itinerary
Building with flight data? Power your app or agent with LetsFG
The same multi-source search behind this page — every airline and the major booking sites, deduplicated and ranked — is available to your app or AI agent. Natural-language or structured queries, live prices, zero price bias.
Try the free sandbox — no card →Free sandbox, instant fake results · email for a key · Bearer-token auth · MCP, Python & JS SDKs · letsfg.co/developers