So with a few Delta Cards you could make this happen. You need 300k points and 926 bucks to fly roundtrip to london. - you could also fly to a different country and avoid the heathrow fees - they are what drive this up to 926.
How do you get 300k points?
1.
Delta Gold - spend 2k in 3 months get 50k points 1k additional gets you 60k miles
2.
Delta Platinum - spend 3k in 3 months get 70k miles - has 200 dollar annual fee not waived the first year. but with your first delta purchase you can get a 100 dollar statement credit so you simply buy a 100 dollar gift card and use that towards your flight fees.
if you and your husband each get one of these cards you'll have 136k points each.
So to add to this you'd need to get one more roundtrip at 60k miles. You could do this with the
Delta Gold Business -
so now you've got enough points to make this work if you can spend the money.
There is an easy way to spend this money.
1. Go to
Top Cash Back and creat an account if you dont have one.
2. Search for Gift card mall .com
3. use link to go to gift card mall
4. at gift card mall select custom card
5. upload a picture
6. buy 2 - 500 dollar gift cards the first 3 times - after the first 3 times you can do 3- 500 per time
7. gift cards will be mailed to you
8. go to Walmart and ask to buy a money order for 999.30 - there is a 70c fee so this will make it 1k even
9. Tell the walmart rep that you have a 500 dollar limit on your debit card and that you need to do 500 per swipe.
10. walmart rep will key in 500.
11. swipe your first card - pin is the last 4 digits
12. swipe your second card
13. walmart rep will give you money order
14. deposit money order in bank
15. pay off your credit card with your bank account
The best part is you will actually make money doing this. each 500 dollar gift card has a 6.95 fee plus you have the 70c per 1k money order - so total cost per 1k of manufactured spend is 14.60. But you went thru top cash back and though it says 1% on Gift card orders its actually 2% for the custom cards - so you will get 20 bucks back - making you 5.40 per transaction.
This is the most mustachian way to make this trip. - i would take it a step further and possibly fly in early to a different airport and take a train down to london. I'd also make a family vacation out of it and see the country while you're there.